CN100417550C - airbag for head protection - Google Patents

Abstract

The present invention relates to an airbag for head protection. The airbag is expanded by air for expanding flowing between the inner lateral wall and the outer lateral wall of a vehicle on one hand, and on the other hand, the airbag is unfolded from the position above lateral windows of the vehicle in which the airbag is accommodated. The airbag is provided with a protective bulge part in a region at the side of a head of a passenger. A temporary connecting part is arranged on the protective bulge part, and connects the inner part and the outer part of the vehicle mutually. When the inner pressure of the protective bulge part is raised after the expansion is completed, the inner part is then separated from the outer part of the vehicle. The airbag of the present invention can ensure that the airbag can be unfolded rapidly at the beginning of the expansion. After the expansion is completed, the present invention can perform expansion thickly with good buffering performance.

Description

airbag for head protection

technical field

The present invention relates to a head protection airbag capable of protecting the head of an occupant by infusing inflation gas from the upper edge side of a side window of a vehicle and inflating it downward.

Background technique

Conventionally, an airbag for protecting the head has a structure in which a thin portion is deployed and then inflated thickly (for example, refer to Japanese Patent Application Laid-Open No. 2003-11767). This kind of airbag is arranged with the protection inflation part that covers the vehicle inner side of the pillar part, and the inflow port for the inflation gas to flow in is arranged on the lower end side. ) on the left and right sides of the ), firstly, let the inflation gas flow in, and expand the prop inflation part in a relatively thin state. The strut swollen portion bulges thickly.

However, in the existing airbag for head protection, the deployment can be completed in a thin state at the initial stage of expansion, and when the expansion is completed, the position that needs to be expanded thickly, such as the strut expansion portion, has to be expanded in terms of improving the cushioning performance of this position. There is room for improvement.

Contents of the invention

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a head-protecting airbag capable of ensuring rapid deployment at the initial stage of inflation and capable of inflating thickly with good cushioning properties after deployment.

The airbag for protecting the head of the present invention is provided with a protection inflation part, which is inflated by the inflation gas on one side and deployed downward from the upper side of the side window of the folded and stored vehicle, and is arranged on the side area of the passenger's head. The airbag for part protection includes: a vehicle inner side wall part and a vehicle outer side wall part arranged on the car inner side and the vehicle outer side of the protective inflatable part, and the inflation gas flows in between them; and a temporary connection part is arranged on the protective inflatable part, The vehicle interior wall portion and the vehicle exterior wall portion are connected to each other, and when the internal pressure of the expanded protection inflation portion rises, the vehicle interior wall portion and the vehicle exterior wall portion are separated from each other.

The head protection airbag of the present invention is deployed and inflated in a state in which the temporary connection portion connects the vehicle interior wall portion and the vehicle exterior wall portion to each other at the initial stage of expansion. Therefore, the protective inflation portion is used in a relatively thin state. The expansion is completed, so as to ensure the rapid expansion in the initial stage of expansion.

And, when the internal pressure of the protection expansion part after the expansion is completed, the temporary connection part separates the vehicle interior wall part and the vehicle exterior wall part from each other, so the protection expansion part can bulge thickly at the position where the temporary connection part is arranged, thereby It is possible to protect the occupant with good cushioning, that is to say, a sufficient impact-absorbing stroke can be ensured.

Therefore, the airbag for head protection according to the present invention can ensure rapid deployment at the initial stage of inflation, and after completion of deployment, can inflate thickly with good cushioning properties, thereby effectively protecting passengers.

It is preferable that the temporary connecting portion is arranged so as to have a portion arranged along the vertical direction, and to separate the vehicle interior wall portion and the vehicle exterior wall portion from the lower end side.

In such a structure, the vehicle inner side wall part and the vehicle outer side wall part of a temporary connection part are mutually separated from the lower part side of the protective expansion part to the upper side. That is to say, the airbag for head protection is a structure that is deployed downward from above the side window. Assuming that the mutual connection between the vehicle interior wall part and the vehicle exterior wall part is released from the upper end side of the temporary connection part, the airbag will not be fully expanded until the expansion is completed. , the upper side of the protective inflatable portion begins to thicken, and the inflation gas reaches the lower side of the protective inflatable portion very late, hindering the completion of rapid deployment of the protective inflatable portion. However, in the above-mentioned structure, the mutual separation of the vehicle interior wall part and the vehicle exterior wall part of the temporary connection part is completed from the lower part side to the upper side of the protection inflation part, therefore, when the inflation gas reaches the protection inflation part sufficiently, In the stage of the lower part side, the mutual separation of the vehicle inner side wall part and the vehicle outer side wall part starts, so that the rapid deployment of the protective inflation part can be ensured safely.

When the temporary connection part of the head protection airbag has a site along the vertical direction, and the vehicle interior wall part and the vehicle exterior wall part are separated from each other and arranged from the lower end side, the temporary connection part is arranged in the protective inflation part. The part to be contacted with the passenger's head may also be provided with a longitudinal flow path on at least one of the front side or the rear side of the part to be contacted. Deployment of the planned contact portion before initially separating the vehicle interior wall portion and the vehicle exterior wall portion of the temporary connection portion is completed.

In the airbag for protecting the head with such a structure, even if the head of the occupant is located in the direction of the outside of the vehicle and close to the side window at the initial stage of the inflow of the inflation gas in the initial stage of inflation, since the inflation gas flows into the longitudinal flow path, the contact plan of the inflated part is protected. The section can also make the expansion complete. At this time, the temporary connection part also expands due to the inflow of the inflation gas from the lower part of the vertical flow path, and the temporary connection part of the contacting part has a structure in which the vehicle interior wall part and the vehicle exterior wall part are separated from each other from the lower end side. , before the deployment of the intended contact portion is completed, the inner side wall portion and the outer side wall portion of the vehicle are not separated from each other, and the intended contact portion is maintained in a thin state to expand, so that even if the head of the occupant approaches the side window, it can easily enter the window. The narrow space makes unfolding complete.

After the expansion of the part to be contacted is completed, the part to be contacted is bulged from the lower side as the inflation gas flows in from the lower side of the longitudinal flow path. Therefore, the vehicle interior wall portion and the vehicle exterior wall portion of the temporary connection portion are separated from each other from the lower end side, so that the intended contact portion where the temporary connection portion is arranged bulges thickly. During this inflation process, the head of an approaching passenger is moved and pushed back to the inside of the vehicle, thereby protecting it with good cushioning properties.

On the other hand, when the passenger's head is located in the vehicle interior direction and is separated from the side window, the airbag for protecting the head of the present invention can smoothly complete the deployment by allowing the inflation gas to flow in, and the inflation gas can Smoothly and quickly flow to protect the various parts of the expansion part. Therefore, the entire area of the protective inflatable portion expands rapidly, and tension is generated in the direction of separation of the vehicle interior wall portion and the vehicle exterior wall portion from each other, so that the vehicle interior wall portion and the vehicle exterior wall portion of the temporary connection portion in the contacting predetermined portion are mutually connected. Smooth and rapid separation, the contact part where the temporary connection part is arranged immediately swells thicker, and then, even if it comes into contact with the head of a passenger who moves close to the contact part, it can be cushioned well, that is, it can Ensuring sufficient impact-absorbing travel to protect the passenger's head.

Therefore, the airbag for head protection of the above-mentioned structure can adjust the movement of deployment and inflation according to the arrangement position of the passenger's head in the vehicle interior and exterior direction, thereby being able to effectively protect the passenger's head with good cushioning.

In this case, in the airbag for head protection, the inflated parts of the front and rear sides of the temporary connection part are preferably formed in such a structure that the thickness of the vehicle interior wall part and the vehicle exterior wall part of the temporary connection part immediately before separation from each other is 30 to 75 mm. . The reason is that if the thickness of the swollen parts on the front and rear sides of the temporary connection part immediately before the vehicle interior wall part and the vehicle exterior wall part are separated exceeds 75 mm, the parts on the front and rear sides of the temporary connection part will expand on one side and face downward. In the case of deployment, during the deployment, it may interfere with the head of the approaching passenger, hindering the completion of the deployment of the planned contact part. In addition, if the parts on the front and rear sides of the temporary connection part are ensured during the expansion process before separation If the thickness is equal to or greater than 30 mm, when one side is inflated and the other side is deployed downward, the completion of deployment will not be hindered, and the passenger's head can be protected from near the completion of deployment to just before the temporary connection part is separated.

In addition, the knee protection airbag that can adjust the deployment and inflation actions according to the arrangement position of the occupant's head in the vehicle interior and exterior direction can also have the following configuration. That is, the airbag for head protection has a non-inflow portion that connects the vehicle interior wall portion and the vehicle exterior wall portion to each other in an inseparable manner and prevents inflation gas from flowing in. of the partition. The partition part has a structure including a covering part arranged upstream of the inflation gas on the upper end side of the temporary connection part to protect the upper end side of the temporary connection part from being damaged by the inflation gas initially flowing in.

Under such a structure, the upper end side of the temporary connection part is protected from being damaged by the inflation gas by the covering part of the partition part, and it can further securely ensure that the inner wall part and the outer wall part of the vehicle are separated from the lower end of the temporary connection part. side separation.

It is preferable that the strength of the temporary connecting portion to separate the vehicle interior wall portion and the vehicle exterior wall portion from each other is set within a range of 50 to 550N.

If such a structure is formed, it is possible to prevent the unnecessary separation of the inner wall portion and the outer wall portion of the vehicle due to the influence of the heat or flow velocity of the inflation gas, and, after the completion of the deployment of the airbag, the vehicle can be moved safely. The inner wall portion and the outer wall portion are separated from each other, and the airbag can be inflated thickly to ensure a sufficient shock absorbing stroke, that is, to improve the cushioning performance. If the strength of the temporary connection part is less than 50N, due to the influence of the heat or flow velocity of the inflation gas, the vehicle interior wall part and the vehicle exterior wall part on the upper end side of the temporary connection part may immediately separate from each other, thereby preventing the airbag from being carried by the passenger. The deployment is completed in a narrow space when the head and the side window are close to each other. If the strength of the temporary joint exceeds 550N, the separation between the inner side wall and the outer side wall at the lower end of the temporary joint will be slow, resulting in a thicker Prolonging the period for inflation is not preferable from the point of view of protecting passengers with good cushioning properties.

In particular, in an airbag having a structure in which the vehicle interior wall portion and the vehicle exterior wall portion are separated from each other from the lower end side of the temporary connection portion while the head of the occupant is in contact with the intended contact portion, the strength of the temporary connection portion is less than or equal to 500N, preferably in the range of 50-500N, so that even in the state of contact with the passenger's head, when the inner wall part and the outer wall part of the car generate tension in the direction of separation with the expansion of the protective expansion part, Also, the separation between the vehicle interior wall and the vehicle exterior wall can be reliably performed. In addition, depending on the arrangement position of the temporary connecting portion, etc., the vehicle interior wall and vehicle In the case where unnecessary separation of the outer wall parts is likely to occur, the strength of the temporary connection part is greater than or equal to 150N, preferably in the range of 150 to 550N. As a result, from the above two viewpoints, the strength of the temporary connection part is preferably 150～500N.

In the case where the temporary connection portion has a portion arranged along the vertical direction, and is arranged so that the vehicle interior wall portion and the vehicle exterior wall portion are separated from each other from the lower end side, if the airbag for head protection is provided so that the vehicle interior The wall portion and the vehicle exterior wall portion are inseparably connected to each other, and the non-inflow portion that does not allow the inflation gas to flow in, the upper end side of the temporary connection portion is approached or connected to the non-inflow portion, and the stress concentration on the upper end side is restricted compared to the lower end side. phenomenon occurs, which is preferable.

With such a structure, when the airbag is inflated, the non-inflow portion restricts the stress concentration on the upper end side of the temporary connection portion, thereby stably separating the inner wall portion and the outer wall portion from the lower end side to the upper end side.

In such a structure, the upper end side of the temporary connection part is close to or connected to the non-inflow part, surrounded by the temporary connection part and the non-inflow part, and the vehicle interior wall part and the vehicle exterior wall part of the temporary connection part are separated and expanded thickly. The portion is formed in a structure in which the gas inflow port of the inflation gas is disposed on the lower side. Like this, through the position that the gas inflow port communicates with the position surrounded by the temporary connection part and the non-inflow part, the expansion is completed at first, so that the part surrounded by the temporary connection part and the non-inflow part can be almost not bulged. Even if the gap between the passenger's head and the side window is very narrow, it can be easily deployed in the narrow space.

In this case, if the gas supply channel portion is arranged along the front-rear direction on the upper edge side of the airbag as the upstream side of the inflowing inflation gas, it will be adjacent to the temporary connection portion protecting the inflatable portion in the front-rear direction and connected to the It is preferable that the upper part communicates with the gas supply flow path part at a part close to or connected to the side opposite to the non-inflow part of the temporary connection part.

In such a structure, in the initial stage of airbag inflation, the part on the side opposite to the side close to or connected to the non-inflow part of the temporary connection part is inflated so as to be thickened in the middle of the completion of the airbag deployment, so it can be protected. Even before the vehicle interior wall portion and the vehicle exterior wall portion of the temporary connection portion are separated from each other, the occupants in the position can be protected within the range that does not affect the deployment performance.

In the case of restricting the stress concentration on the upper end side of the temporary connection portion than the lower end side, if the non-inflow portion is equipped with a partition that is arranged in the up-down direction to separate the protective expansion portion, the temporary connection portion can also make the upper end side by It is bent toward the upstream side of the inflation gas while following the flow of the inflation gas, and is close to or connected to the upper end side of the partition.

If the head protection airbag is formed in such a structure, when the inflation gas in the initial stage of inflation flows in, the inflation gas and the upper end side of the temporary connection part are not likely to interfere in the vertical direction, so that the inflation gas can not be affected. The influence of heat or the like ensures that the vehicle interior wall portion and the vehicle exterior wall portion are separated from each other from the lower end side of the temporary connection portion stably.

At this time, if the structure in which the inflation gas flows in the front-rear direction near the upper end of the partition is formed, the horizontal line part of the temporary connection part is arranged below the upper end of the partition to prevent direct contact with the flow of the inflation gas. The upper end side of the connecting portion is not affected by the inflation gas, so that the vehicle interior wall portion and the vehicle exterior wall portion can be stably separated from the lower end side of the temporary connection portion.

In order to limit the occurrence of stress concentration on the upper end side of the temporary connection portion compared to the lower end side, if the non-inflow portion is provided with a partition portion arranged in an inverted U shape so as to surround the front, rear and upper side of the temporary connection portion, And by separating the protective expansion part, the upper end of the temporary connection part can be close to or connected with the upper horizontal bar part of the inverted U-shaped partition part.

Under such a structure, the upper end side of the temporary connection part can not be affected by the heat of the inflation gas that initially flows into the airbag through the horizontal bar part of the partition part and the longitudinal bar part in the front and rear, and the vehicle interior wall can be stabilized stably. The portion and the vehicle exterior wall portion are separated from the lower end side of the temporary connection portion.

In the case of restricting the occurrence of stress concentration on the upper end side of the temporary connection part compared to the lower end side, if the non-inflow part is provided in the front and rear of the temporary connection part, and a partition part arranged in the vertical direction to separate the protective expansion part is provided, then the temporary connection is preferable. The upper end side of the portion is provided with a horizontal line portion close to or connected to the upper end side of the front and rear partitions.

Under such a structure, on the horizontal line portion on the upper end side of the temporary connection portion, the front and rear ends are close to or connected to the upper end side of the partition portion, so it is difficult to generate stress concentration, and the vehicle interior wall portion and the vehicle exterior surface can be stably connected. The wall parts are separated from the lower end side of the temporary connection part. If the vehicle interior wall part and the vehicle exterior wall part in this area of the temporary connection part are separated from each other, even the front and rear of the temporary connection part close to or connected with the front and rear partition parts The walls are also separated from each other at the part where the upper horizontal line is longer, so that it can expand thicker and improve cushioning.

In the case where the temporary connecting portion is formed by a disconnectable thread that connects the vehicle interior wall portion and the vehicle exterior wall portion to each other, such a temporary connection portion may be formed by sewing the vehicle interior wall portion and the vehicle exterior wall portion to each other, Alternatively, the sewing operation is not performed, but the warp or weft yarn formed by the tube weaving to form the vehicle interior wall part and the vehicle exterior wall part itself is woven into the vehicle exterior wall part and the vehicle interior wall part on the other side simply by providing a joint part. , it can be formed simply and easily during tube weaving. Of course, if this aspect is not considered, a peelable adhesive may also be used to bond the vehicle interior wall portion and the vehicle exterior wall portion to each other to form a temporary connection portion.

Description of drawings

FIG. 1 is a schematic front view showing a vehicle mounted state of a head protection airbag using an airbag according to an embodiment of the present invention.

Fig. 2 is a front view of the airbag according to the embodiment.

Fig. 3 is a partial longitudinal sectional view of the airbag in the embodiment when inflated, corresponding to III-III in Fig. 2 .

4A, 4B, 4C, and 4D are partial transverse cross-sectional views sequentially showing the state of the airbag inflated according to the embodiment, corresponding to the IV-IV portion of FIG. 2 .

5A, 5B, 5C, and 5D are partial transverse cross-sectional views sequentially showing the state of the airbag inflated according to the embodiment, corresponding to the V-V portion of FIG. 2 .

FIG. 6 is a schematic view showing the airbag in the middle of inflation in a state where the occupant is separated from the side window, and is in the vicinity of the temporary connection portion, and corresponds to the VI-VI portion of FIG. 1 .

FIG. 7 is a schematic view showing the airbag in the middle of inflation near the temporary connection portion, showing the state after FIG. 6 .

Fig. 8 is a schematic view showing the state of completion of inflation of the airbag in the vicinity of the temporary connection portion, showing the state after Fig. 7 .

FIG. 9 is a schematic view showing a state in which the inflation of the airbag in the vicinity of the temporary connection portion is completed, and shows the state after FIG. 8 .

10A and 10B are schematic diagrams showing in order the inflated state of the airbag in the state where the passenger approaches the side window, and the vicinity of the temporary connection portion.

FIGS. 11A and 11B sequentially show the inflated state of the airbag in the state where the passenger approaches the side window, and show the state after FIG. 10 .

Fig. 12 is a front view of an airbag according to another embodiment.

Fig. 13 is a front view of an airbag of another embodiment.

Fig. 14 is a front view of an airbag of another embodiment.

Fig. 15 is a front view of an airbag of another embodiment.

Fig. 16 is a front view of an airbag of another embodiment.

Fig. 17 is an enlarged schematic view showing a joint portion of the airbag shown in Fig. 12 .

Fig. 18 is a schematic cross-sectional view showing the middle of inflation of an airbag according to another embodiment.

Fig. 19 is a graph when measuring the separation strength of an airbag formed by tubular weaving.

Detailed ways

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2 , the head-protecting airbag 20 according to the embodiment is used in a head-protecting airbag device M mounted on a vehicle V. As shown in FIG. The structure of this airbag device M for head protection includes an airbag 20 , an inflator 12 , mounting brackets 10 and 13 , and an airbag cover 8 . The airbag 20 is folded and accommodated on the upper edge side of the side windows W1 and W2 on the vehicle interior side of the vehicle V from the lower edge side of the front pillar portion FP to the upper side of the rear pillar portion RP through the roof rail RR.

The structure of the inflator 12, as shown in FIGS. The inflator 12 is covered by the lower edge 5a of the roof lining 5 by the mounting bracket 13, and is fixed to the inner panel 2 of the roof side member RR near the upper side of the center pillar CP. The inner panel 2 is a part of the vehicle V on the vehicle body 1 side. The mounting bracket 13 is made of sheet metal, holds the inflator 12 , and is fixed to the inner panel 2 with mounting bolts 14 .

Each mounting bracket 10 is made of two sheets of sheet metal (refer to FIGS. The installation part 37 is installed and fixed on the inner panel 2 . Nuts 2 b are provided to fasten the respective mounting bolts 11 into mounting holes 2 a formed on the inner panel 2 .

The airbag cover 8 is composed of the pillar garnish 4 disposed on the front pillar portion FP and the respective lower edges 4a, 5a sides of the roof lining 5 disposed on the roof side member RR. The front pillar garnish 4 and the roof liner 5 are made of synthetic resin, and are respectively attached and fixed to the inner side of the inner panel 2 of the vehicle body 1 to the front pillar portion FP and the roof rail portion RR. The headliner 5 is arranged from the vicinity above the front pillar portion FP, through above the center pillar portion CP, to the vicinity above the rear pillar portion RP.

The airbag 20, as shown in Figures 1 to 5, is made of tubular weaving such as polyamide yarn. In the airbag 20 of the embodiment, an air leakage preventing coating such as silicone rubber, which is usually provided, is not provided on the outer surface, but an air leakage preventing coating may be appropriately provided. The airbag 20 flows in the inflation gas G from the inflator 12, is deployed from the folded state, and covers the vehicle interior of the side windows W1, W2 and the pillar garnishes 7, 6 of the center pillar portion CP and rear pillar portion RP7. Expand to swell. The airbag 20 includes a gas inflow portion 21 that inflates by inflating gas G to separate the vehicle interior wall portion 21 a from the vehicle exterior wall portion 21 b , and a non-inflow portion 35 that prevents inflation gas G from inflowing.

The non-inflow portion 35 is formed so as to connect the wall portions 21 a and 21 b of the gas inflow portion 21 to each other, and is composed of a peripheral edge portion 36 , an attachment portion 37 , partition portions 38 and 39 , and a plate-like portion 40 . The peripheral portion 36 is arranged at the outer peripheral portion of the airbag 20 and is formed to surround the gas inflow portion 21 .

A plurality of mounting portions 37 (seven in the embodiment) are arranged so as to protrude upward from the peripheral portion 36 on the upper edge 20 a side of the airbag 20 , and fasten the mounting bracket 10 for mounting on the inner panel 2 ( Refer to Figure 6, 18). In each mounting portion 37, a mounting hole 37a through which the mounting bolt 11 passes is opened.

The plate portion 40 is formed in a rectangular plate shape, and is arranged below the gas supply flow path portion 23 between the front and rear front seat protection portions 25 and rear seat protection portions 26 . The plate-like portion 40 is arranged to reduce the volume of the gas inflow portion 21 while ensuring the overall shape of the airbag 20 and to shorten the time to complete inflation.

The partition portion 38 is a portion that partitions the gas supply flow path portion 23 from the protection portions 25 and 26, and is disposed on the front seat protection portion 25 and the rear seat protection portion 25 along the gas supply flow path portion 23 and along the front-rear direction. Use the protective part 26 on.

The partition part 39 is arranged as a thickness restricting part, and it is arranged in the substantially vertical direction in the area of each of the front seat and rear seat use protection parts 25, 26, and divides the protection parts 25, 26 into a plurality of vertical units 24a, so that The thickness of the airbag 20 at the time of completion of inflation is limited, and the airbag 20 is inflated into a plate shape. In the embodiment, a partition 39A extending downward from the vicinity of the front end of the partition 38 and two partitions 39B and 39C extending downward from the rear side of the partition 38 are arranged in the area of the front seat protection portion 25 . In the region of the rear seat protection portion 26 , one partition portion 39 is arranged to extend downward from the middle of the partition portion 38 in the front-rear direction. The longitudinal units 24a partitioned by the partition 39 and arranged side by side in the front-rear direction shorten the length of the airbag 20 in the front-rear direction when inflated, and generate tension in the front-rear direction on the lower edge 20b side of the airbag 20 when the inflation is completed.

In the embodiment, the gas inflow portion 21 is composed of a connection port portion 22 , a gas supply flow path portion 23 , and a protective inflation portion 24 . The gas supply channel portion 23 is arranged on the upstream side of the inflation gas G than the protective inflation portion 24 and is arranged linearly along the front-rear direction of the vehicle V on the upper edge 20 a side of the airbag 20 . A connecting port 22 is formed to extend upward at a substantially middle portion in the front-rear direction of the gas supply channel portion 23 for allowing the inflation gas G from the inflator 12 to flow into the gas inflow portion 21 . In the gas supply channel portion 23 , the inflation gas G flows toward both sides in the front-rear direction of the vehicle V when the inflation gas G flows in from the connection port portion 22 .

The protection inflatable portion 24 is a region for protecting the head of an occupant sitting on the seat of the vehicle V, and includes a front seat protection portion 25 and a rear seat protection portion 26 . The front seat protector 25 is arranged below the front side of the gas supply flow path 23, and when the airbag 20 is deployed and inflated, it is arranged on the side of the front seat of the vehicle V, and inflates so as to cover the side window W1 on the side of the front seat. . The rear seat protector 26 is arranged below the rear side of the gas supply channel 23, and is arranged on the side of the rear seat of the vehicle V when the airbag 20 is deployed and inflated, and covers the side window W2 on the side of the rear seat. The protective inflatable part 24 is partitioned by the partition part 39 that limits the thickness, expands in the form of extending in a rod shape in the vertical direction, and is provided with a plurality of longitudinal units 24a arranged in parallel in the front-rear direction of the vehicle V, and the front seat protection part 25 Four vertical units 24a are provided, and the rear seat protection portion 26 is provided with two vertical units 24a.

Among these longitudinal units 24a, the front seat protector 25, the longitudinal unit 24a surrounded by the partition 38 and the front and rear partitions 39A, 39B contacts the head H of the passenger C sitting in the front seat, forming a structure to protect the front seat passenger C. The intended contact portion 27 of the head H of the rear seat, the rear seat protection portion 26, the vertical unit 24a between the partition portion 39 and the peripheral portion 36 on the rear edge 20c side of the airbag 20, and the head of the passenger C sitting on the rear seat H is in contact with each other to form a planned contact portion 27 that protects the head H of the passenger C on the rear seat. Temporary connection parts 31 and 32 are arranged on these planned contact parts 27 . These temporary connection parts 31, 32 are formed by the sewing thread 33 which sews and connects the vehicle inner side wall part and the vehicle outer side wall part 21a, 21b mutually. As for the temporary connection part 31, two vertical part 31d along the up-down direction are formed in the front seat protection part 25, and two are arrange|positioned, and each upper end 31a is connected to the partition part 38. As shown in FIG. The temporary connecting portion 32 is composed of two parts disposed substantially along the up-down direction on the rear seat protection portion 26, and the temporary connecting portion 32 on the front side is only formed by connecting the upper end 32a to the rear end of the partition portion 38. The temporary connecting portion 32 on the rear side connects the upper end 32a to the rear end of the partition portion 38, bends the lower end 32b side, and extends downward. . That is, the temporary connection portion 32 on the rear side is composed of a horizontal line portion 32c extending rearward from the partition portion 38 and a vertical line portion 32d extending linearly downward from the rear end side bent from the horizontal line portion 32c.

Each temporary connection part 31, 32, when tension is generated on the wall part 21a, 21b, the lower end 31b, 32b side is more likely to generate stress concentration than the upper end 31a, 32a side, and each lower end 31b, 32b extends linearly to the side of the partition part 39. Near the lower end 39a, so that the wall portions 21a, 21b can be separated from the lower end 31b, 32b side, stop midway in the area of the protection expansion portion 24, so that it is not connected to the peripheral edge portion 36, and then make the upper end 31a, 32a side and the non- The partition part 38 of the inflow part 35 is connected.

The breaking strength of the sewing thread 33 is set to such a strength that it will not be broken immediately when the intended contact portion 27 expands, and when each intended contact portion 27 expands, the small unit 28 in a thinner state makes the inner The pressure rises to bulge, and the vehicle inner side wall portion 21a and the vehicle outer side wall portion 21b of the contacting portion 27 are disconnected when a predetermined tension is generated in the direction of separating from each other.

The small unit 28 is an expansion part divided front and rear at the temporary connection parts 31 and 32 . The thickness T of these small units 28 immediately before the temporary connection parts 31 and 32 are separated is in the range of 30 to 75 mm. In an embodiment, the thickness T is 50 mm.

The strength of the temporary connection parts 31, 32 to separate the vehicle interior wall part and the vehicle exterior wall part 21a, 21b from each other is specifically set in the range of 50-550N, and the vehicle interior wall part and the vehicle exterior wall are separated from the lower end 31b, 32b side. The parts 21a and 21b are arranged so as to be separated from each other.

In the embodiment, the wall parts 21a and 21b formed by the tube weaving are taken as a sample, partly taken out, and the wall parts 21a and 21b are superimposed on each other with the suture thread 33 to form a linear suture site, and then the suture site is grasped respectively on the extension line. The edges of the wall portions 21a, 21b are pulled in the vertical direction of the wall portions 21a, 21b, so that the edges of the wall portions 21a, 21b are separated from each other, and the breaking load of the suture 33 at this time is regarded as the separation load, and then the suture line is adjusted. 33 tensile strength and seam spacing, etc., so that the separation load is in the range of 50-550N.

The airbag 20 according to the embodiment is disposed on the front side and the rear side of the intended contact portion 27 of the front seat protection portion 25 at the initial stage of the inflow of the inflation gas G, and the inflation gas G flows from above to below to complete the contact with the intended portion 27. Expanded vertical flow path portion 29 (29A, 29B). The front side and rear side of the intended contact portion 27 of the rear seat protection portion 26 are also arranged at the initial stage of the inflow of the inflation gas G, so that the inflation gas G flows from above to the bottom, and the longitudinal flow of the expansion of the intended contact portion 27 can be completed. Road section 29 (29C, 29D). The vertical flow path 29A on the side of the front seat protector 25 is composed of the partition portion 39A on the front side of the partition portion 39A and the vertical unit 24a between the peripheral edge portion 36, and the vertical flow path 29B is composed of the partition portion 39C and the plate-shaped portion 40 on the rear side. The vertical unit 24a between constitutes. The vertical flow path 29C on the side of the expansion part 26 for the rear seat is constituted by the vertical unit 24a between the partition part 39 on the front side of the partition part 39 and the plate-shaped part 40, and the vertical flow path 29D is formed by the reconnection of the temporary connection part 32 on the rear side. The small unit 28 on the rear side constitutes itself. These vertical channels 29 are arranged on the upstream side of the flow of the inflation gas G from the intended-contact portion 27 , and a gas inflow port 29 a for the inflation gas G to flow into the intended-contact portion 27 is formed at the lower portion thereof. In the protection part 26 for the rear seat, the small unit 28 on the rear end side doubles as a longitudinal flow path 29D, and the gas inlet 29a on the lower part side is arranged at the lower end 32b of the temporary connection part 32 on the rear end side and the side of the airbag lower edge 20b. between the peripheral portions 36 .

The process of loading the airbag 20 into the vehicle V is described. First, the airbag 20 is flattened, and the creases D (refer to the two-dot chain line in FIG. 2 and FIG. The airbag 20 is folded in a serpentine shape so that the lower edge 20b side of the airbag 20 approaches the upper edge 20a side.

Next, after the airbag 20 is folded, the specified place of the airbag 20 is wrapped with a non-illustrated adhesive tape that can be broken to prevent folding and unraveling. At the same time, the inflator 13 and the installation brackets 10, 13 are installed to form an airbag assembly. body.

Then, each mounting bracket 10, 13 is arranged at a predetermined position of the inner panel 2 on the vehicle body 1 side, each mounting hole 37a is passed through, and the bolts 11, 14 are tightened to fix each mounting bracket 10, 13 to the inner panel. 2, the airbag assembly is installed on the vehicle body 1. Subsequently, the unillustrated lead wire that the specified inflator motor action control device is extended is connected on the inflator 12, and the front pillar trim 4 and the roof lining 5 are installed on the vehicle body 1, and then the rear pillar trim 6, The airbag device M can be mounted on the vehicle V by attaching the center pillar garnish 7 to the vehicle body 1 .

After the airbag device M is mounted on the vehicle V, when the inflator 12 operates, the inflation gas G from the inflator 12 flows into the gas supply flow path from the connection port 22 as shown by the two-dot chain line in FIG. 2 . Part 23 flows through the gas supply flow path portion 23 to both sides in the front and back direction, and then is supplied into each vertical flow path 29, and the protective inflation portion 24 of the airbag 20 unfolds while releasing the folding, and then starts to inflate. Then, the airbag 20 disconnects the adhesive tape not shown in the figure, and then pushes away the airbag cover 8 on the lower edge 4a, 5a side of the front pillar trim 4 and the top cover inner lining 5, as shown in the double points of Fig. 1 and 6 As indicated by dashed lines, one side protrudes downward, and the other side is largely expanded and expanded so as to cover the vehicle interior 1 of the side windows W1 , W2 , the center pillar portion CP, and the rear pillar portion RP.

At this time, as shown in FIGS. 6 and 7 , when the head H of the passenger is located in the direction I of the vehicle interior and away from the side windows W1 and W2, the airbag 20 of the embodiment can allow the inflation gas G to flow in, so that the deployment can be completed smoothly. , and the inflation gas G smoothly and rapidly flows to various parts of the protective inflation portion 24 . Therefore, as shown in FIGS. 8 and 9, the entire area of the protective inflatable portion 24 expands rapidly, and tension is generated in the direction of separation of the vehicle inner wall portion and the vehicle outer wall portion 21a, 21b, so that the temporary contact portion 27 is also made The vehicle inner side wall parts of the connection parts 31, 32 and the vehicle outer side wall parts 21a, 21b are separated from the suture line 33 on the lower end 31b, 32b side while being separated smoothly and quickly, so that the temporary connection parts 31, 32 are arranged. Immediately, the intended contact portion 27 bulges thickly, and after that, even if it comes into contact with the head H of a passenger who has moved close to the intended contact portion 27, the cushioning property is good, that is, a sufficient shock absorbing stroke is ensured, Protect the passenger's head H (refer to FIG. 4, FIG. 5).

Therefore, the head protection airbag 20 according to the embodiment is deployed in a state where the temporary connection portions 31, 32 connect the vehicle interior wall portions and the vehicle exterior wall portions 21a, 21b to each other at the initial stage of inflation. The vertical unit 24a can ensure rapid expansion at the initial stage of expansion. When the internal pressure rises after the expansion is completed, the temporary connection parts 31 and 32 separate the vehicle inner side wall part and the vehicle outer side wall part 21a and 21b from each other, so that the expansion can be performed with good cushioning. Made thicker, it can effectively protect passengers.

The temporary connecting parts 31, 32 are provided with vertical line parts 31d, 32d disposed along the vertical direction in the longitudinal unit 24a of the protective expansion part 24, so that the vehicle inner side wall part and the vehicle outer side are connected from the lower end 31b, 32b side. The wall parts 21a and 21b are arranged so as to be separated from each other. Therefore, as shown in FIGS. 7 to 9 , the vehicle interior wall portions and vehicle exterior wall portions 21 a , 21 b of the temporary connection portions 31 , 32 are separated from each other from the lower side to the upper side of the protective inflation portion 24 . That is to say, the head protection airbag 20 is configured to deploy downward from above the side windows W1, W2. , 21b mutual connection release, then before the deployment is completed, the upper side of the protective inflatable part 24 begins to thicken, and the inflation gas G reaches the lower part of the protective inflatable part 24 very late, which hinders the rapid deployment of the protective inflatable part 24. . However, in the above-mentioned structure, the separation of the vehicle interior wall portions of the temporary connection portions 31, 32 and the vehicle exterior wall portions 21a, 21b from each other is carried out from the lower side to the upper side of the protection expansion part 24, so the flow to the protection expansion part When the inflation gas G on the lower side of 24 reaches sufficiently, the separation between the vehicle inner side wall and the vehicle outer side wall 21a, 21b starts, and the rapid deployment of the protective inflatable part 24 can be ensured stably.

On the other hand, in the initial stage of inflow of the inflation gas G in the initial stage of inflation, as shown in FIGS. Flowing into the vertical flow path 29, the contact predetermined part 27 of the protective expansion part 24 can complete the deployment. Moreover, the temporary connection parts 31, 32 themselves form such a structure that as the inflation gas G flows in from the gas inlet port 29a on the lower side of the vertical flow path 29, the expansion occurs, so that the vehicle interior wall part and the vehicle exterior wall part 21a are inflated. , 21b are mutually separated from the lower end 31b, 32b side, so before the planned contact portion 27 is deployed, the vehicle interior wall portion and the vehicle exterior wall portion 21a, 21b are not separated from each other (refer to A, B of FIG. 4, A, B of FIG. B) As a result, the planned contact portion 27 is unfolded while maintaining a thin state, and even if the head H of the occupant approaches the side windows W1, W2, it is easy to enter the narrow space to complete the unfolding.

After the planned contact portion 27 is deployed, as shown in A of FIG. C in FIG. 5 , C in FIG. 5 , if sufficient tension is generated on the vehicle inner side wall part and the vehicle outer side wall part 21a, 21b of the intended contact part 27, as shown in B of FIG. The inner side wall part and the vehicle outer side wall part 21a, 21b are mutually separated from the lower end 31b, 32b side (refer to FIG. 4D, FIG. 5D), and the contact part 27 where the temporary connection part 31, 32 is arranged is thickly bulged. . When inflated, the head H of an approaching passenger is moved and pushed back to the inner side I of the vehicle, and is protected with good cushioning properties.

Therefore, the head protecting airbag 20 according to the embodiment can adjust the deployment and inflation actions according to the arrangement position of the occupant's head H in the vehicle interior and exterior directions, thereby effectively protecting the occupant's head H with good cushioning properties.

In the head protecting airbag 20 according to the embodiment, the inflated portions (small) on the front and rear sides of the temporary connecting parts 31 and 32 immediately before the vehicle inner side wall parts and the vehicle outer side wall parts 21a and 21b of the temporary connecting parts 31 and 32 are separated from each other. The unit) 28 has a thickness of 50 mm within the range of 30 to 75 mm, so that the occupant's head H can be protected without hindering the expansion of the intended contact portion 27 before the temporary connection portions 31 and 32 are separated. That is to say, if the thickness T of the small unit 28 immediately before the vehicle inner side wall part and the vehicle outer side wall part 21a, 21b of the temporary connection part 31, 32 separates exceeds 75 mm, the small unit 28 expands downward while expanding. In the case of deployment, there is a possibility of interference with the head H of an approaching occupant during deployment, preventing the completion of deployment of the intended contact portion 27 . In addition, if the thickness T of the small unit 28 at the time of expansion before separation is ensured to exceed 30 mm, it will not hinder the completion of the deployment when it is expanded while being deployed, and the temporary connection parts 31 and 32 will be separated from the vicinity of the completion of the deployment. , can protect the passenger's head H.

In the airbag 20 according to the embodiment, the strength of the temporary connection parts 31 and 32 for separating the vehicle interior wall part and the vehicle exterior wall part 21a and 21b from each other is set within a range of 50 to 550N. Therefore, the airbag 20 can prevent unnecessary separation of the vehicle interior wall portion and the vehicle exterior wall portions 21a, 21b from each other due to the influence of heat or flow velocity of the inflation gas G, and can prevent the airbag 20 from being separated from each other after the completion of the deployment of the intended contact portion 27. By stably separating the vehicle interior wall portion and the vehicle exterior wall portion 21a, 21b from each other, the intended contact portion 27 can be thickly expanded to ensure a sufficient shock absorbing stroke, in other words, the cushioning property becomes better. That is to say, even if the separation strength of the temporary connection parts 31, 32 is low when the passenger's head H is far away from the side windows W1, W2, it does not hinder the separation strength when the passenger's head H is close to the side windows W1, W2. In this case, the planned contact portion 27 is close to the head of the passenger, and the deployment is completed. At this time, if the strength of the temporary connection portions 31 and 32 is less than 50N, due to the influence of the heat or flow velocity of the inflation gas G, the temporary connection portion will be damaged. 31, 32, the vehicle interior wall portions on the upper end sides 31a, 32a side and the vehicle exterior wall portions 21a, 21b immediately separate from each other, and the upper part of the intended contact portion 27 bulges, thereby possibly hindering the expansion of the intended contact portion 27. If the separation strength of the temporary connection parts 31, 32 is as high as exceeding 550N, the mutual separation of the vehicle interior wall part and the vehicle exterior wall part 21a, 21b on the lower end 31b, 32b side of the temporary connection part 31, 32 is delayed, resulting in a predetermined contact. The part 27 expands thickly to delay the timing of pushing the occupant's head H in contact with the intended contact part 27 back to the vehicle interior 1, which is not preferable from the point of view of protecting the occupant's head moving in the direction of the vehicle exterior O.

An embodiment of a structure in which the vehicle interior wall portion and the vehicle exterior wall portion 21a, 21b are separated from each other from the lower end 31b, 32b side of the temporary connection portion 31, 32 in a state where the occupant's head H is in contact with the intended contact portion 27 In the airbag 20, the strength of the temporary connecting parts 31 and 32 is less than or equal to 500N, preferably in the range of 50 to 500N, so that even in the state of being in contact with the passenger's head H, when the vehicle interior wall part and the vehicle exterior Even when the wall portions 21a, 21b generate tension in the separation direction with the expansion of the protective inflatable portion 24, the vehicle interior wall portion and the vehicle exterior wall portion 21a, 21b can be reliably separated from each other. In addition, depending on the arrangement positions of the temporary connection parts 31, 32, etc., unnecessary separation between the vehicle interior wall part and the vehicle exterior wall part 21a, 21b is likely to occur due to the influence of the heat or flow velocity of the expansion gas G. In the case of the situation, the strength of the temporary connection parts 31, 32 is greater than or equal to 150N, preferably in the range of 150-550N. As a result, from the above two viewpoints, the strength of the temporary connection parts 31, 32 is preferably 150-500N.

In the airbag 20 of the embodiment, as the non-inflow portion 35, the partitions 38, 38 for partitioning the gas supply passage 23 and the protection portions 25, 26 are provided in the region protecting the inflatable portion 24, and these partitions 38, 38 are arranged On the upstream side of the inflation gas G on the upper ends 31a, 32a side of the temporary connection parts 31, 32, it functions as a covering part, and can protect the upper ends 31a, 32a side of the temporary connection parts 31, 32 from being flowed into the initial inflation gas G. Gas destruction. By the covering part 30 of the partition part 38, 38, the upper end 31a, 32a side of the temporary connection part 31, 32 is protected from being damaged by the inflation gas G, and the vehicle inner side wall part and the vehicle outer side wall part 21a, 21b can be further securely secured. Separated from the side of the lower end 31b, 32b of the temporary connection part 31, 32 from each other. In particular, on the side of the temporary connection part 31, the partition part 38 completely covers the upper part of the upper end 31a in the vertical direction of the longitudinal line part 31c, and further thickens the protection of the upper end 31a.

The front seat protector 25 of the airbag 20 is arranged so as to partition the area of the front seat protector 25 , and the partitions 38 , 39A, 39B of the non-inflow portion 35 that connect the vehicle interior wall 21 a and the vehicle exterior wall 21 b , forming a substantially inverted U-shaped structure to surround the front, rear and top of the temporary connecting parts 31, 31. The temporary connection parts 31 and 31 arrange|positioned in the up-down direction form the structure which makes the upper end 31a close to or connects to the horizontal bar part 38 which is the upper part of the substantially inverted U-shaped partition part. That is to say, the airbag 20 of such structure passes through the horizontal bar portion 38 of the partition of the non-inflow portion 35 and the front and rear vertical bar portions 39A, 39B, and the upper end 31a side of the temporary connection portion 31 is completely free from the initial inflow into the airbag 20. Influenced by the heat and the like of the expansion gas G inside, the vehicle interior wall portion and the vehicle exterior wall portions 21a, 21b can be stably separated from the lower end 31b side of the temporary connection portion 31 .

In this airbag 20, the upper part of the intended contact portion 27 of the front seat protection portion 25 is covered by the partition 38, and the inflation gas G flows into the intended contact portion 27 only from the gas inlets 29a on the front and rear sides, so that the intended contact portion can 27 is thinly developed, and when subsequent inflation gas G flows in, the gas G for inflation can flow in from the gas inlets 29a at the front and rear, so that the small unit 28 can be rapidly bulged.

In the intended contact portion 27 of the airbag 20 according to the embodiment, the temporary connection portions 31 and 32 arranged approximately in the vertical direction are arranged side by side in the front-rear direction, so that a plurality of small units 28 are arranged in the front-rear direction, and the temporary connection portions 31 and 32 are separated. At this time, the plurality of small units 28 arranged in the front-rear direction are expanded in an integrated manner, the planned contact part 27 can be expanded thickly, the cushioning property of the planned contact part 27 becomes better, and a sufficient shock absorption stroke is ensured, thereby protecting the Passenger's head H.

In order to secure a large thickness when the contact portion is inflated, the structure of the head protecting airbag 20A as shown in FIG. 12 may be formed. This airbag 20A is formed in such a structure that the partition part 38 arranged at each of the protective parts 25 and 26 of the airbag 20 is shortened, and the front seat protective part 25 of the airbag 20A is provided with a temporary connection part 31A of the longitudinal line part 31d, 31A, the upper ends 31a of the vertical line portion 31d are connected to each other with a common horizontal line portion 31c that intersects with the vertical line portion 31d in the perpendicular direction, and the front and rear ends of the horizontal line portion 31c are further connected to the upper ends of the partitions 42,43. 42a, 43a are connected. The partitions 42, 43 are formed in an inverted J-shape or an inverted U-shape to function as thickness control portions, and the protection portions 25, 26 are arranged along the front-rear direction and are divided into a plurality of vertical units. The horizontal line portion 31c is arranged along the lower edge of the gas supply channel portion 23 . The intended contact portion 27A of the protective portion 25 with the passenger's head H is a portion between the partition portions 42 and 43 below the horizontal line portion 31c. On the protection portion 26 side, the partition portion 42 is arranged, the horizontal line portion 32 c is shared, and the upper end 42 a of the partition portion 42 is connected to the two temporary connection portions 32A.

In the airbag 20A of this kind of structure, at the initial stage of inflation, the front and rear ends of the horizontal line portion 31c on the side of the upper end 31a of the temporary connection portion 31A of the front seat protection portion 25 are connected to the upper ends 42a, 43a of the front and rear partitions 42, 43. The upper end 31a side of the temporary connecting portion 31A is less prone to stress concentration, and the vehicle interior wall portion and the vehicle exterior wall portions 21a, 21b can be stably separated from the lower end 31b side of the temporary connecting portion 31A. And, the inflation gas G flowing in from the gas inlets 29a of the front and rear longitudinal flow passages 29, 29 fills the vehicle interior wall portion and the vehicle exterior wall portion of the entire area including the temporary connection portions 31A, 31A of the horizontal line portion 31c. 21 a , 21 b are separated from each other, and the intended contact portion 27A expands thickly so as to be integrated with the gas supply flow path portion 23 .

In the case of forming a structure in which stress concentration does not occur on the upper end side of the temporary connection portion in the intended contact portion, the structure of the head protection airbag 20B as shown in FIG. 13 may be formed. In this airbag 20B, in each of the protective parts 25 and 26, the temporary connection parts 31B and 32B arranged at the intended contact part 27B are formed in an inverted L shape, and the horizontal line part 31c on the side of the upper end 31a and the partition part of the non-inflow part 35 The upper end 45a of 45 is connected. Each partition part 45 of the protection part 25, 26 functions as a thickness control part, and an upper end 45a is connected to the upper end side of the plate part 40, and partitions the gas supply channel part 23 and the protection part 25, 26.

In this airbag 20B, the intended contact portion 27B with the passenger's head H is arranged in the area between the partition 42 and the partition 45 on the front seat protection portion 25, and the small units on the front and rear sides of the temporary connection portion 31B In 28 (28U, 28D), the small unit 28U on the front side functions as the vertical flow path 29, and is located upstream of the gas G from the small unit 28D. In the rear seat protection part 26, the intended contact part 27B is arranged between the partition part 45 and the airbag rear edge 20c, and in the small units 28 (28U, 28D) on the front and rear sides of the temporary connection part 32B, the small unit on the rear side The unit 28U functions as the vertical flow path 29 and is located on the upstream side of the gas G of the small unit 28D.

In the planned contact portion 27B of the airbag 20B, when the inflation gas G flows into the vertical flow path portion 29, the deployment is completed, and the inflation gas G flows in from the gas inflow port 29a on the lower side of the small unit 28U on the upstream side. On the small unit 28D side, the small units 28U, 28D complete the expansion. Then, on the temporary connection parts 31B and 31B, the upper end 31a side is connected to the partition part 45 of the non-inflow part 35, and the lower end 31b side is formed into a straight line, and stops halfway at the peripheral edge part 36 in the area reaching the protection parts 25 and 26. Therefore, the stress concentration on the upper end 31a, 32a side is limited, and the vehicle interior wall portion and the vehicle exterior wall portion 21a, 21b can be stably separated from each other toward the upper end 31a, 32a side from the lower end 31b, 32b side where stress concentration easily occurs.

When the wall portions 21a, 21b are separated from the lower end side of the temporary connection portion, stress concentration is more likely to occur at the lower end than at the upper end. If so, the temporary connection portion 31C of the airbag 20C shown in FIG. , 32C, the upper ends 31a, 32a and the upper end 45a of the partition 45 of the non-inflow portion 35 may be approached or slightly separated.

In the airbags 20B, 20C, the upper end 31a, 32a side of the temporary connection part 31B, 31C, 31B, 32C is close to or connected to the upper end 45a side of the partition part 45 arranged in the substantially vertical direction of the non-inflow part 35, and is temporarily connected. Parts 31B, 31C, 31B, 32C and partition 45 are surrounded by the temporary connection parts 31B, 31C, 31B, 32C in the vehicle inner side wall part and the vehicle outer side wall part 21a, 21b separated thickly inflated part (small unit) 28D, a gas inflow port 29a for the inflation gas G is disposed on the lower side. Therefore, the position 28U communicating with the small unit 28D through the gas inflow port 29a is completed first, so that the deployment can be completed in a relatively thin state where the small unit 28D hardly bulges, even if the passenger's head is in contact with the side window. The gap between W1 and W2 is very narrow, and the small unit 28D can be easily deployed in this narrow space.

In these airbags 20B, 20C, on the upper edge 20a side, as the upstream side of the inflating gas G flowing in, the gas supply flow path portion 23 is arranged along the front-rear direction, and the temporary connection portion 31B with the protective inflation portion 24 is arranged. , 31C, 31B, and 32C are adjacent in the front-rear direction and are adjacent to the temporary connection portions 31B, 31C, 31B, and 32C or on the opposite side of the partition portion 45 of the non-inflow portion 35 (small unit) 28U, so that The upper side communicates with the gas supply channel portion 23 . Therefore, in such a structure, the small unit 28U can be inflated at the initial stage of inflation of the airbags 20B and 20C so that the thickness of the airbags 20B and 20C increases halfway through the completion of deployment, thereby protecting the occupant on the part 28U, even in the temporary connection part 31B. , 31C, 32B, and 32C before the vehicle interior wall portions and the vehicle exterior wall portions 21a, 21b are separated from each other, passengers can be protected within the range that does not affect the deployment performance.

In the airbags 20B, 20C, the partition portion 45 that partitions the protection inflation portion 24 of the non-inflow portion 35 is arranged approximately in the vertical direction, and the temporary connection portions 31B, 31C, 32B, 32C make the horizontal line portion 31c on the side of the upper end 31a, 32a , 32c is bent toward the upstream side of the inflation gas G (connection port 22 side) while following the flow direction of the inflation gas G (flow direction along the front-rear direction), and is connected to the upper end 45a side of the partition 45 on one side. approach or connect. Therefore, under such a structure, when the inflation gas G in the initial stage of inflation flows in, it is difficult for the inflation gas G to touch the horizontal line portion on the upper end 31a, 32a side of the temporary connecting portion 31B, 31C, 32B, 32C in the vertical direction. 31c, 32c interfere, so that the vehicle interior and exterior wall portions 21a, 21b are stably separated from the lower ends 31b, 32b of the temporary connection portions 31B, 31C, 32B, 32C without being affected by the inflation gas G.

In particular, in the airbag 20C, the upper ends 31a, 32a of the temporary connection parts 31C, 32C are arranged slightly lowered from the upper end 45a of the partition part 45, so that it is difficult to directly touch the inflation gas G flowing in the front-rear direction, and Stress concentration is less likely to occur, and the separation between the vehicle interior wall portion and the vehicle exterior wall portion 21a, 21b from the lower ends 31b, 32b side is ensured more stably.

In the airbags 20, 20A, 20B, and 20C already described, the lower end 31b, 32b side is formed in a straight line, above the peripheral edge portion 36 as the non-inflow portion 35 on the airbag lower edge 20b side. side stops, so that stress concentration is likely to occur on the lower end 31b, 32b side of the temporary connecting portion 31, 31A, 31B, 31C, 32, 32A, 32B, 32C, however, it can also be formed like the airbag 20D shown in FIG. 15 . The structure is that the lower end 31b, 32b side of the temporary connecting portion 31D, 32D is bent into a curved shape, so that the strength when the suture 33 is disconnected is improved, and the vehicle interior wall portion and the vehicle exterior wall portion 21a, 21b are separated from each other by the temporary connection portion. The timing at which the lower ends 31b, 32b of 31D, 32D separate is slightly delayed.

Of course, as shown in the airbag 20E shown in FIG. 16 , in the case where the inverted L-shaped temporary connection portions 31E, 32E are provided, it is also possible to form a structure in which a plurality of temporary connection portions are provided in the intended contact portion 27E. Like the airbags 20 and 20A, 31E and 32E expand the thickness of the planned contact part 27E after the wall parts 21a and 21b of the temporary connection parts 31E and 32E are separated from each other.

In each of the airbags 20, 20B, 20C, 20D, and 20E, the temporary connecting portion 31 and the like can be formed simply and easily by sewing the interior side wall portion 21a and the exterior side wall portion 21b using the sewing thread 33. Connecting portion 31 and the like.

On the other hand, in the airbag 20A shown in FIG. 12, instead of sewing the temporary connecting portions 31A and 32A, as shown in FIG. The warp or weft SA of the vehicle exterior wall portion 21a, 21b itself is woven into the weft or warp SB of the vehicle exterior wall portion on the other side and the vehicle interior wall portion 21b, 21a side, and is woven through these warp or weft threads SA, SB. During tube knitting, the temporary connection portions 31A, 32A can be formed simply and easily.

Certainly, under the situation that does not consider this point (can simply form the temporary connection part), as shown in the airbag 20F shown in Fig. 18, also can use the adhesive agent BC that can be peeled off, make the vehicle interior wall part and the vehicle exterior The wall portions 21a, 21b are bonded to each other to form the temporary connection portion 31F.

Table 1 and FIG. 19 show: when changing the pitch when the joint portion 34 of the airbag 20A is provided, the number of threads SA (column) used when weaving the other side, and the number of threads Sb on the weaving side Next, measure the data of separation strength.

In this measurement, a predetermined junction is provided on the wall parts 21a and 21b formed by the tube weaving to form a linear temporary connection, and this part is taken out as a sample part, and the extension lines of the linear temporary connection are grasped respectively. The edge of the upper wall portion 21a, 21b is pulled to the vertical direction of the wall portion 21a, 21b, so that the edge of the wall portion 21a, 21b is separated from each other, and the tensile load when the wall portion 21a, 21b is separated at this time is measured, and the load is defined as Separation strength records.

In Table 1, the numbers after the columns in the left column are distances between columns. For example, 2 columns - 2mm means that the wires SA provided with the connecting portion 34 form 2 rows (two are used), and the distance between the wires SA is 2 mm. 1/1 in the upper column means weaving one thread SA into one thread SB to form a junction 34, and 2/2 means weaving two adjacent threads SA into two threads SB to form a junction 34, 3/3 means that three wires SA are woven into three wires SB to form a junction 34, and the numerical value after that is the pitch of the junction 34 along the wire SA.

The breaking strength of the wires SA and SB is 20-50N/wire.

The graph in FIG. 19 is a graphic representation of the data shown in Table 1 (a) to (k).

This data shows that even if the temporary connection part of the joint part 34 is provided by forming a pitch of 1/1 of 12mm, the separation strength can be ensured to 74.3N exceeding 50N, so that even if it is affected by the heat of the expansion gas to some extent , it is also difficult to unnecessarily separate the temporary connection part. On the other hand, it can also be seen that in the temporary connection portion in which 3/3 of the joint portions 34 with a pitch of 3 mm are arranged in three rows at intervals of 4 mm, a separation strength of 640 N exceeding 550 N is formed, and the vehicle interior wall portion of the airbag and The separation of the vehicle exterior wall portions from each other is slow and delays completion of inflation, which is not preferable.

From these data, it can be seen that: in the case of forming a column of 1/1, setting joints 34 according to a specified pitch, and forming a temporary connection, if the separation strength is Y (N) and the spacing is X (mm), the distance through Y =1.6559X ² +36.715X+276.6, where 50≥Y≥550N, find the value of X, and arrange the joints at the interval of this value to easily form the temporary connection.

In addition, in the case of ensuring the separation strength within the range of 150 to 550N, in the temporary connection part where the joint parts 34 are provided at a pitch of 1/1 of 6 mm, 9 mm and 12 mm, the pitch of the joint part 34 is too large, The separation strength is less than 150N. As already described, in the temporary connection part where the junction part 34 of 3 mm pitch is provided in 3 columns 3/3 at an interval of 4 mm, since a separation strength of 640 N exceeding 550 N is formed, it can be seen from these data that: In the temporary connection formed by the joints during tube weaving, if it is a joint in which three or less threads are woven into the other side of the thread, the spacing between the joints is preferably 1 to 4mm In the case of weaving 3 threads into the other side, the limit is 2 columns, and in the case of weaving 1 thread into the other side, it can also be 3 columns.

Claims (16)

1. An airbag for head protection, having a protective inflatable part, which is inflated by inflation gas on one side and deployed downward from the upper side of the side window of a folded and stored vehicle, and is arranged on the side area of the passenger's head , The airbag for head protection has: a vehicle interior wall portion and a vehicle exterior wall portion disposed on the vehicle interior side and the vehicle exterior side of the protection inflation portion, and the inflation gas flows therebetween; and The temporary connection part is arranged on the protection expansion part, connects the vehicle interior wall part and the vehicle exterior wall part, and when the internal pressure of the protection expansion part after deployment is increased, the vehicle interior wall portion and the vehicle exterior wall portion are separated from each other. 2. The airbag for head protection as claimed in claim 1, The temporary connecting portion is disposed so as to have a portion disposed along the vertical direction, and to separate the vehicle interior wall portion and the vehicle exterior wall portion from the lower end side. 3. the airbag for head protection as claimed in claim 2, The temporary connecting portion is disposed at a contact scheduled portion of the protective inflatable portion that comes into contact with the passenger's head, At least one of the front side and the rear side of the intended contact portion is provided with a vertical flow path that allows the inflation gas to flow from above to below, and can make the temporary connection portion of the temporary connection portion flow in the initial stage of the inflation gas. The deployment of the planned contact portion is completed before the vehicle interior wall portion and the vehicle exterior wall portion are separated from each other. 4. The airbag for head protection as claimed in claim 3, The expansion parts on the front and rear sides of the temporary connection part have a structure such that the thickness of the vehicle interior wall part and the vehicle exterior wall part of the temporary connection part immediately before separation from each other is 30 to 75 mm. 5. the airbag for head protection as claimed in claim 3, a non-inflow portion that prevents inflation gas from flowing in while connecting the vehicle interior wall portion and the vehicle exterior wall portion inseparably to each other, The non-inflow portion has a partition portion that partitions the area of the protection expansion portion, The partition part has a structure including a covering part arranged upstream of the inflation gas on the upper end side of the temporary connection part to protect the upper end side of the temporary connection part from flowing into the initial inflation. Destroy with gas. 6. The airbag for head protection as claimed in claim 2, The strength of the temporary connecting portion for separating the vehicle interior wall portion and the vehicle exterior wall portion from each other is set within a range of 50 to 550N. 7. The airbag for head protection as claimed in claim 2, a non-inflow portion that connects the vehicle interior wall portion and the vehicle exterior wall portion inseparably to each other so that inflation gas does not flow in, In the temporary connection portion, the upper end side is brought closer to or connected to the non-inflow portion, so that the occurrence of stress concentration on the upper end side than on the lower end side can be restricted. 8. The airbag for head protection as claimed in claim 7, On the upper edge side of the airbag, as the upstream side of the inflowing inflation gas, a gas supply flow path portion is arranged along the front-rear direction, Adjacent to the temporary connection part of the protective inflation part in the front-rear direction and opposite to the side close to or connected to the non-inflow part of the temporary connection part, the upper part side and the gas The supply channel part is arranged in communication with each other. 9. The airbag for head protection as claimed in claim 7, The non-inflow portion has a partition arranged in the vertical direction to partition the protection expansion portion, The temporary connection portion is disposed close to or connected to the upper end side of the partition while bending its upper end side toward the upstream side of the inflation gas while following the flow direction of the inflation gas. 10. The airbag for head protection as claimed in claim 9, forming a structure in which the inflation gas flows in the front-rear direction near the upper end of the partition, The horizontal line portion of the temporary connection portion is arranged below the upper end of the partition portion, so as to prevent direct contact with the flow of the inflation gas. 11. The airbag for head protection as claimed in claim 7, The non-inflow portion is provided with a partition that is arranged in an inverted U shape so as to surround the front, rear and upper side of the temporary connection portion, and partitions the protective expansion portion, The upper end of the temporary connection part is close to or connected to the upper horizontal bar of the inverted U-shaped partition part. 12. The airbag for head protection as claimed in claim 7, The non-inflow portion is provided with partitions disposed in the vertical direction in front of and behind the temporary connection portion to partition the protective expansion portion, The temporary connection part is provided with a horizontal line part close to or connected to the upper end side of the front and rear partition parts on the upper end side. 13. The airbag for head protection as claimed in claim 1, The temporary connecting portion includes a breakable line connecting the vehicle interior wall portion and the vehicle exterior wall portion to each other. 14. The airbag for head protection as claimed in claim 13, The breakable line connecting the vehicle interior wall portion and the vehicle exterior wall portion to each other is constituted by a sewing thread that sews the vehicle interior wall portion and the vehicle exterior wall portion to each other. 15. The airbag for head protection as claimed in claim 13, The airbag is formed by tubular weaving, The disconnectable thread connecting the vehicle interior wall portion and the vehicle exterior wall portion to each other is formed of a tube extending from at least one side of the vehicle interior wall portion or the vehicle exterior wall portion to the other side and is woven. Woven warp or weft. 16. The airbag for head protection as claimed in claim 1, The temporary connecting portion is formed using an adhesive that releasably bonds the vehicle interior wall portion and the vehicle exterior wall portion to each other.

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