JP2008143273A - Vehicular occupant crash protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an occupant crash protector capable of favorably suppressing the positional deviation of an airbag inflated between a wrap belt part and an occupant. <P>SOLUTION: The occupant crash protector 20 has an airbag 22 to be inflated between a buckle 8 with a tongue of a seat belt to be fitted thereto and an occupant P in a collision of a vehicle. The airbag 22 is formed so that the volumetric ratio of a front portion 22a to a rear portion 22b with the advancing direction of the vehicle as a reference is 3/7 to 7/3 when the airbag is inflated with a wrap belt part 6b of the seat belt being a boundary, and the airbag is inflated at least from a front end of a backrest part 3 of a seat 1 to a substantially center part of a seat part 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an occupant protection device that protects an occupant of a vehicle when a vehicle such as an automobile collides, and particularly relates to protection around the occupant's waist.

2. Description of the Related Art Conventionally, as described in Patent Document 1 or 2, for example, there is an occupant protection device including an airbag that inflates around the occupant's waist when a vehicle collides.
In the occupant protection device of Patent Document 1, an airbag module is mounted on a lap belt portion of a seat belt that is stretched horizontally from one side of the seat to the other side in front of the lumbar portion of the occupant. The lap belt portion includes a first portion that directly supports the occupant's body, and a second portion that supports the occupant's body further away from the occupant's body than the first portion and includes an airbag module. . In the event of a vehicle collision, the airbag is deployed and inflated in front of the occupant's waist from the second portion to protect the occupant. Further, in this occupant protection device, even if the second part is separated from the occupant due to the reaction force of the airbag, the first part can more firmly tighten the occupant to the seat, so that the occupant can slip out of the seat belt. The so-called submarine phenomenon can be prevented.

Also in the occupant protection device described in Patent Document 2, the airbag module is mounted on the lap belt portion. In this occupant protection device, the airbag has a torso portion corresponding to the occupant's torso, a thigh portion corresponding to the occupant's thigh, and a waist portion therebetween so that the airbag follows the occupant's body in front of the occupant. It is configured to expand and expand in an L shape.
JP 2002-539012 A Special table 2003-519040 gazette

  By the way, although the airbag protection apparatus of the said patent documents 1 and 2 is an airbag inflating around a passenger | crew's waist | hip | lumbar part, all are for protecting the front side of a passenger | crew's waist | hip | lumbar part. Therefore, in these occupant protection devices, it is difficult to protect the side of the occupant's waist, and the occupant's waist may not be sufficiently protected from the seat belt buckle, console box, door trim, and the like.

  Thus, for example, an airbag that inflates and deploys between the occupant and the lap bell portion of the seat belt is conceivable as an airbag that inflates on the side of the waist of the occupant when the vehicle collides. However, since such an airbag is pressed against the lap belt portion when inflated, there is a possibility that the airbag is pushed forward or rearward of the lap belt portion. That is, depending on the shape and size of the airbag, there is a possibility that the position of the lap belt portion may be displaced and the occupant's waist side cannot be suitably protected.

  The present invention has been made in view of such circumstances, and an occupant protection device capable of suitably suppressing the displacement of an airbag that is inflated between an occupant and a lap belt portion on the occupant's waist side. It is to provide.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a lap belt portion of a seat belt that is stretched horizontally in front of the occupant's waist from one side of the seat to the other side in the event of a vehicle collision. An occupant protection device for a vehicle comprising an airbag that inflates between at least one of the one side and the other side between the occupant and the occupant, wherein the airbag is a lap belt of a seat belt The gist is that the volume ratio between the front part and the rear part with respect to the traveling direction of the vehicle at the time of expansion is 3/7 to 7/3.

  The lap belt portion of the seat belt is stretched horizontally in front of the occupant's waist from one side of the seat to the other side. Here, in the airbag inflated on the side of the waist of the occupant, the volume ratio of the front part and the rear part with reference to the traveling direction of the vehicle with the lap belt as a boundary is, for example, 1: 9 (1/9 ), 2: 8 (2/8), etc., the airbag may be pressed by the lap belt portion and pushed out rearward of the lap belt portion. On the other hand, in such an airbag, the volume ratio of the front part and the rear part with reference to the traveling direction of the vehicle with the lap belt part as a boundary is, for example, 9: 1 (9/1) or 8: 2 (8 / 2), the airbag may be pressed by the lap belt portion and pushed forward of the lap belt portion. That is, when the airbag is inflated, the airbag may be pushed forward or rearward if the airbag is largely biased forward or rearward with respect to the lap belt portion.

  In this regard, as a result of intensive studies by the inventors of the present application, in such an airbag, the volume ratio of the front portion and the rear portion with respect to the traveling direction of the vehicle with the lap belt portion as a reference is from 3: 7 to 7. : 3, it was found that even when the airbag is pressed against the lap belt portion, the airbag is inflated in a stable state without being pushed forward or rearward of the lap belt portion. That is, according to the said structure, since the position shift of the airbag by the press of a lap belt part can be suppressed suitably, a passenger | crew's waist | hip | lumbar part side can be protected suitably.

  Moreover, according to said structure, the lap belt part is not largely biased relatively to the front side or the rear side in the front-rear direction of the airbag, and is disposed in the vicinity of the center part. And since the vicinity of the central part of the airbag is normally inflated most greatly, the occupant can be restrained by the lap belt part more effectively when the airbag is inflated. In addition, for example, when the airbag is inflated and deployed at the time of a collision in the front-rear direction of the vehicle, the lap belt portion may move to the front side or to the rear side relative to the airbag. Since the lap belt portion is still arranged near the center of the airbag, the airbag does not come out of the lap belt portion.

  According to a second aspect of the present invention, in the event of a vehicle collision, between the lap belt portion of the seat belt and the occupant, which is stretched horizontally in front of the occupant's waist from one side of the seat to the other side. A vehicle occupant protection device including an airbag that inflates at least one of a side and the other side, wherein the airbag is recessed at a portion corresponding to a lap belt portion of a seat belt. The gist is that

  The lap belt portion of the seat belt is stretched horizontally in front of the occupant's waist from one side of the seat to the other side. Here, if the airbag that inflates on the side of the waist of the occupant protrudes or is formed flat, for example, in a portion corresponding to the lap belt portion, the lap belt portion relatively moves on the surface of the airbag. It becomes slippery and the airbag may be pushed forward or backward of the lap belt portion. In this respect, according to the above configuration, since the lap belt portion of the seat belt is fitted into the recess formed when the airbag is inflated, there is no possibility that the airbag will pass through the lap belt portion and be pushed forward or backward. That is, since the position shift of the airbag due to the lap belt portion can be suitably suppressed, the occupant's waist side can be suitably protected.

  According to a third aspect of the present invention, in the event of a vehicle collision, between the lap belt portion of the seat belt and the occupant that is stretched horizontally in front of the occupant's waist from one side of the seat to the other side. An occupant protection device for a vehicle comprising an airbag that inflates at least one of a side and the other side, wherein the airbag is seated at least from an end of the seat back on the vehicle traveling side. The gist of the present invention is that the seat portion is formed so as to expand to substantially the center with respect to the vehicle traveling direction.

  In the above configuration, from the end of the seat back portion of the seat in which the airbag is inflated to the substantially center of the seat portion of the seat, when the occupant is an adult of a standard body shape, for example, Corresponds to the center of the thigh from the rear end of the waist. In other words, since the airbag is formed in a size that covers the side of the occupant's waist over a relatively wide area, the lap belt portion of the seat belt moves relative to the airbag. However, the airbag does not completely penetrate the lap belt portion and is not pushed forward or backward. Thereby, since the position shift of the airbag by a lap belt part can be suppressed suitably, a passenger | crew's waist | hip | lumbar part side can be protected suitably.

  Moreover, according to said structure, the lap belt part is not largely biased relatively to the front side or the rear side in the front-rear direction of the airbag, and is disposed in the vicinity of the center part. And since the vicinity of the central part of the airbag is normally inflated most greatly, the occupant can be restrained by the lap belt part more effectively when the airbag is inflated. In addition, for example, when the airbag is inflated and deployed at the time of a collision in the front-rear direction of the vehicle, the lap belt portion may move to the front side or to the rear side relative to the airbag. Since the lap belt portion is still arranged near the center of the airbag, the airbag does not come out of the lap belt portion.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the height of the portion corresponding to the lap belt portion of the seat belt of the airbag is the same as that when the occupant wears the seat belt. The gist is that it is formed lower than the height of the lap belt portion.

  According to the above configuration, since the lap belt portion is not pushed up even when the airbag is inflated, the lap belt portion is not separated from the occupant's body. Thereby, it can suppress that what is called a submarine phenomenon that a passenger | crew penetrates a seatbelt occurs.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the airbag is housed in a buckle device having a buckle to which a tongue of a seat belt is attached before inflating. The gist.

  According to the above configuration, the airbag is inflated between the buckle, the lap belt portion, and the occupant. And since an air bag expand | swells between a passenger | crew's waist | hip | lumbar side and a buckle apparatus reliably at the time of inflation, a passenger | crew's waist | hip | lumbar side can be reliably protected from a buckle etc.

  ADVANTAGE OF THE INVENTION According to this invention, the position shift of the airbag which expand | swells between a passenger | crew and a lap belt part can be suppressed suitably, and a passenger | crew's waist | hip | lumbar part side can be protected suitably.

(First embodiment)
Hereinafter, a first embodiment in which the vehicle occupant protection device 20 of the present invention is embodied will be described with reference to FIGS. In the following explanation, the traveling direction of the vehicle is described as the front, and the front, rear, top, bottom, left, and right are defined based on that direction. In the case of a seat, the state installed in the vehicle is the standard. In addition, front, rear, upper, lower, left, and right are defined corresponding to each direction of the vehicle.

  FIG. 1 is a perspective view of a vehicle seat to which the vehicle occupant protection device 20 of the present embodiment is applied. As shown in FIG. 1, a vehicle seat (hereinafter simply referred to as a seat) 1 disposed in a vehicle (not shown) can be reclined with a seat portion 2 that supports a thigh from an occupant's buttocks. The backrest part 3 comprised, the headrest 4 which supports a passenger | crew's head, and the seatbelt 5 are provided.

  The seat belt 5 is a three-point fixed seat belt provided to restrain an occupant seated on the seat 1. More specifically, the seat belt 5 includes a belt-like webbing 6 that restrains an occupant, a tongue 7 that is movably attached to the longitudinal direction of the webbing 6, and a tongue 7 that is disposed on the side of the seat 1. And a buckle device 10 to which is attached. One end of the webbing 6 is fixed to the side surface of the seat 1 where the buckle device 10 is not disposed, and the other end is wound by a seat belt winding device (not shown). The length is adjustable. Further, the tongue 7 includes a sliding portion 7 a that is inserted through the webbing 6 and slides along the webbing 6, and an engaging portion 7 b that engages with the buckle 8 of the buckle device 10. With this configuration, the length of the webbing 6 is appropriately changed according to the occupant's body shape, and the tongue 7 is appropriately slid with respect to the webbing 6, so that the shoulder portion of the passenger from the tongue 7 to the seat belt retractor The length of the shoulder belt portion 6a that restrains the lap belt and the lap belt portion that restrains the waist of the occupant from one end of the webbing 6 to the tongue is appropriately changed. That is, the shoulder belt portion 6a is bridged to the side of the lumbar region obliquely from the shoulder through the front of the chest when seated, and restrains the shoulder portion of the occupant. From the side (anchor side not shown) to the other side (the buckle 8 side), the front of the occupant's waist is bridged horizontally to restrain the occupant's waist.

  The buckle device 10 includes a box-shaped buckle 8 that engages with the tongue 7, and a retainer 9 for attaching the buckle device 10 to the side of the seat 1. One end of the buckle 8 is formed with an insertion port 8a into which the tongue 7 of the seat belt 5 is inserted and engaged. A plate-like connecting portion 8b is disposed at the end opposite to the insertion port 8a. And the retainer 9 is being fixed to the side surface of the sheet | seat 1, and the edge part of the said connection part 8b is attached to this retainer 9 rotatably.

  The buckle device 10 is provided with an occupant protection device 20. FIG. 2 is an enlarged view of the buckle device 10, where (a) is a perspective view and (b) is a side view. As shown in FIG. 2, the occupant protection device 20 includes an inflator 21 that is a gas generation source and an inflatable cloth airbag 22. The inflator 21 includes an igniter (not shown) and a gas generating agent inside to generate gas to be supplied into the airbag 22 and is formed in a cylindrical shape that is long in the axial direction, and the longitudinal direction of the vehicle is the longitudinal direction. It is being fixed to the retainer 9 of the buckle apparatus 10 so that it may become. Further, the airbag 22 is housed near the seat 1 side inside the buckle 8 before inflating, and is configured to be deployed toward the seat 1 from the seat 1 side surface of the buckle 8 when inflated. Yes. Specifically, although not shown, the airbag 22 is folded into, for example, a bellows before being inflated and stored in a compact manner in the buckle 8 so that the airbag 22 can be instantly inflated. The inflator 21 is connected to the airbag 22 via a supply pipe 21 a for supplying gas to the bag-like airbag 22.

  Next, the operation of the occupant protection device 20 will be described. FIG. 3 is a front view of the seat 1 when the occupant is seated, and FIG. 4 is a side view of the seat 1 when the occupant is seated. 3 and 4A show a state before the airbag 22 is inflated, and FIG. 3B shows a state when the airbag 22 is inflated. As shown in FIG. 4, a console box 30 is provided on the side of the seat 1 on the buckle device 10 side.

  When a collision detection unit (not shown) (for example, an abnormal acceleration detection unit) detects a collision (abnormal acceleration), a control unit (not shown) operates the inflator 21 and high pressure gas is supplied from the inflator 21 into the airbag 22. In addition, the detection of the collision at this time may detect only a side collision of the vehicle, or may detect both a side collision and a frontal collision. Thereby, the fold of the airbag 22 starts to expand and starts to inflate. As shown in FIGS. 3 and 4B, the airbag 22 is a space formed between the buckle 8, the occupant P, the lap belt portion 6b, and the seat portion 2 by popping out from the buckle 8 when inflated. Expands and expands. More specifically, the airbag 22 covers the side surface of the buckle 8 when inflated, and the length in the front-rear direction extends from the front end portion of the seat back portion 3 to the approximate center of the seat portion 2 of the seat 1. It is formed to be a size. Note that the length of the airbag 22 in the front-rear direction corresponds to the center of the thigh from the rear end of the waist of the occupant when the occupant P is, for example, an adult of a standard body shape. Since the airbag 22 is formed in such a size that the side of the occupant's waist covers a relatively wide area, even if the lap belt portion 6b moves relative to the airbag 22. The airbag 22 does not completely penetrate the lap belt portion 6b. In addition, the height of the airbag 22 when it is inflated is formed so as to gradually decrease from the backrest 3 side to the front side of the vehicle, and at the portion corresponding to the lap belt portion 6b, the height of the lap belt portion 6b is They are formed at approximately the same height. Thereby, the airbag 22 is slightly pressed by the lap belt portion 6b.

  Further, the airbag 22 is inflated to the front portion 22a that inflates and deploys to the front side of the seat portion 2 and to the backrest portion 3 side, with the boundary line by the lap belt portion 6b shown in line A of FIG. When divided into the rear part 22b to be developed, the volume ratio between the front part 22a and the rear part 22b is, for example, 4: 6 (4/6). That is, although the airbag 22 is slightly biased toward the rear side with the lap belt portion 6b as a boundary, the airbag 22 is not largely biased toward the rear side. Therefore, even if the airbag 22 is pressed by the lap belt portion 6b, the airbag 22 is not pushed backward by the pressing force.

  As a result of the intensive studies by the inventors of the present application, in the airbag 22, if the volume ratio of the front portion 22a and the rear portion 22b with the lap belt portion 6b as a boundary is 3/7 to 7/3, It has been found that the bag 22 can remain stable when inflated. Therefore, the volume ratio between the front portion 22a and the rear portion 22b of the airbag 22 is not limited to 4/6, and this volume ratio is 3/7 to 7/3 depending on, for example, the portion that the occupant wants to protect. It may be changed and set as appropriate within the range. That is, when it is desired to protect not the center of the thigh of the occupant P but the knee side, the airbag 22 is formed so as to be inflated and deployed to the front end portion of the seat portion 2 of the seat 1. The volume ratio between the portion 22a and the rear portion 22b may be, for example, 7/3.

  In this manner, in the occupant protection device 20, even when the airbag 22 is pressed by the lap belt portion 6b, the positional deviation of the airbag 22 can be suitably suppressed. Therefore, this airbag 22 can suitably protect the occupant's waist side from the buckle 8, the console box 30, and the like.

As described above in detail, the present embodiment has the following effects.
(1) In the occupant protection device 20 of the above-described embodiment, the airbag 22 that is inflated between the buckle 8 and the occupant at the time of a vehicle collision is disposed from the front end portion of the seat back portion 3 to the seat portion 2 of the seat 1. It is formed so as to expand to substantially the center. And when this occupant is an adult of a standard body shape, for example, this airbag 22 corresponds to the thigh center from the rear end of the occupant's waist, and is thus formed relatively large, Even if the lap belt portion 6b moves relative to the airbag 22, the airbag 22 does not completely penetrate the lap belt portion 6b and is not pushed forward or backward. As described above, in the occupant protection device 20, the airbag 22 can cover the occupant's lower side of the occupant over a relatively wide range, and appropriately suppress the displacement of the airbag 22 due to the lap belt portion 6b. Therefore, the occupant's waist side can be reliably protected.

  Further, as shown in FIG. 4, the lap belt portion 6 b is not significantly biased relatively to the front side or the rear side in the front-rear direction of the airbag 22, and is disposed in the vicinity of the center portion. Since the vicinity of the central portion of the airbag 22 is normally inflated to the greatest extent, the occupant P can be restrained more effectively by the lap belt portion 6b when the airbag 22 is inflated. For example, when the airbag 22 is inflated and deployed at the time of a collision in the front-rear direction of the vehicle, the lap belt portion 6b moves to the front side or to the rear side relative to the airbag 22. However, since the lap belt portion 6b is still arranged near the center of the airbag 22, the airbag 22 does not come out of the lap belt portion 6b.

  (2) In the occupant protection device 20 of the above-described embodiment, the airbag 22 that is inflated between the buckle 8 and the occupant when the vehicle collides, the front portion 22a and the rear portion 22b with the lap belt portion 6b of the seat belt 5 as a boundary. And a volume ratio of 3: 7 (3/7) to 7: 3 (7/3). Specifically, in the above embodiment, the volume ratio of the airbag 22 is 4/6. Therefore, although the airbag 22 is slightly biased to the rear side with the lap belt portion 6b as a boundary, the airbag 22 is not largely biased to the front or rear, so that the airbag 22 is not likely to be pushed rearward. That is, even if the airbag 22 is pressed against the lap belt portion 6b, the airbag 22 can be inflated in a stable state, so that the positional deviation of the airbag 22 due to the pressing of the lap belt portion 6b can be suitably suppressed. Therefore, the side of the occupant's waist can be suitably protected.

  (3) In the occupant protection device 20 of the above embodiment, the airbag 22 is stored in the buckle 8 of the buckle device 10 before inflating. As a result, the airbag 22 is inflated on the side of the waist of the occupant P so as to cover the side of the buckle 8 when inflated. Can be protected.

(Second Embodiment)
Next, a second embodiment of the vehicle occupant protection device 120 according to the present invention will be described with reference to FIG. In the following description, the same members as those in the first embodiment will be described using the same reference numerals.

  FIG. 5 is a perspective view showing the occupant protection device 120 of the present embodiment. As shown in FIG. 5, in the occupant protection device 120 of the present embodiment, the shape of the airbag 122 when it is inflated is different from that of the airbag 122 of the first embodiment. Specifically, in the first embodiment, the height of the airbag 22 gradually decreases from the backrest portion 3 side to the vehicle front side, and the portion corresponding to the lap belt portion 6b is formed flat, In the present embodiment, a recess 122c is formed at a portion corresponding to the lap belt portion 6b of the airbag 122 during inflation. The height of the recess 122c corresponding to the lap belt portion 6b in the airbag 122 is formed lower than the height of the lap belt portion 6b when the occupant wears the seat belt 5.

  Here, in this airbag 122, if a portion corresponding to the lap belt portion 6b protrudes or is formed flat, the lap belt portion 6b becomes relatively slippery on the surface of the airbag 122, and the airbag There is a possibility that 122 is pushed forward or backward of the lap belt portion 6b. However, in this embodiment, since the lap belt portion 6b fits into the concave portion 122c when the airbag 122 is inflated, it is possible to suppress the airbag 122 from passing through the lap belt portion 6b and being pushed forward or backward. it can. That is, since the position shift of the airbag 122 due to the lap belt portion 6b can be suitably suppressed, the occupant's waist side can be suitably protected.

  That is, in this embodiment, since the recess 122c is formed in the airbag 122, the size of the airbag 122 itself and the volume ratio with the lap belt portion 6b as a boundary are adjusted as in the first embodiment. Therefore, the positional deviation of the airbag 122 can be suppressed. That is, the airbag 122 has a volume ratio of the front portion 122a and the rear portion 122b of, for example, 2/8 with the lap belt portion 6b as a boundary, and is largely biased to the rear side. Even if it does not reach the approximate center of the direction, the positional deviation of the airbag can be suitably suppressed.

  Further, since the height of the recess 122c of the airbag 122 is formed to be lower than the height of the lap belt portion 6b, the lap belt portion 6b is not pushed up even when the airbag 122 is inflated. That is, since the lap belt portion 6b can reliably restrain the occupant without being separated from the occupant's body due to the inflation of the airbag 122, a so-called submarine phenomenon in which the occupant passes through the seat belt 5 occurs. Can be suppressed.

As described above in detail, this embodiment has the following effects in addition to the effect (3) of the first embodiment.
(4) In the occupant protection device 120 of the above embodiment, the recess 122c is formed at the portion corresponding to the lap belt portion 6b of the airbag 122 during inflation. Thereby, since the lap belt part 6b fits into the recessed part 122c formed when the airbag 122 is inflated, there is no possibility that the airbag 122 will pass through the lap belt part 6b and be pushed forward or backward. Therefore, since the position shift of the airbag 122 by the lap belt part 6b can be suppressed suitably, a passenger | crew's waist | hip | lumbar part side can be protected suitably.

  (5) In the occupant protection device 120 of the above embodiment, the height of the portion corresponding to the lap belt portion 6b of the airbag 122 is formed lower than the height of the lap belt portion 6b when the occupant wears the seat belt. ing. Thereby, even if the airbag 122 is inflated, the lap belt portion 6b is not pushed up, so that the lap belt portion 6b is not separated from the occupant's body, and a so-called submarine phenomenon occurs in which the occupant goes through the seat belt. This can be suppressed.

The present invention can be embodied in the following modifications.
FIG. 6 is a perspective view showing an occupant protection device 220 of a first modification. In the first embodiment, the airbag 22 before being inflated is stored in the buckle 8 of the buckle device 10. In this modification, as shown in FIG. 6, the buckle device 10 is an airbag before being inflated. A case 23 for housing 22 is provided as a separate member from the buckle 8. And this case 23 is attached to the sheet | seat 1 side of the connection part 8b of the buckle apparatus 210, for example. With such a configuration, a buckle conventionally used can be applied as it is to the buckle 8 of the buckle device 210. Also in the present embodiment, since the airbag 22 jumps out from the buckle device 210, the airbag 22 reliably inflates between the side of the occupant's waist and the buckle device 210 when inflated, and the side of the occupant's waist from the buckle 8 or the like. It can be surely protected.

  FIG. 7 is a perspective view showing an occupant protection device 320 of a second modified example. In the first embodiment, the airbag 22 is deployed and inflated from the buckle device 10. However, as shown in FIG. 7, this modified example is provided at the end of the seat portion 2 on the buckle device 310 side. The occupant protection device 320 is accommodated, and when the airbag 22 is inflated, the airbag breaks through the seat portion 2 of the seat and deploys upward. Even if it is such a structure, since an airbag expand | swells between a passenger | crew and the buckle 8, it can protect a passenger | crew's waist | lumbar part side.

  FIG. 8 is a perspective view showing an occupant protection device 420 according to a third modification. In the first embodiment, the inflator 21 of the occupant protection device 20 is attached so that the longitudinal direction of the vehicle is the longitudinal direction. In this modification, the inflator 21 is attached so that the longitudinal direction of the inflator 21 is the vertical direction. It is what. Even with such a configuration, the same effects as those of the first embodiment can be obtained. The shape of the inflator 21 is not particularly limited, and may be formed in a rectangular parallelepiped shape instead of a columnar shape.

  6 to 8 are applied to the airbag 22 having the same shape as that of the first embodiment for the sake of convenience. However, the modification having the same shape as that of the second embodiment is described. These modifications may be applied in the same manner.

  In the occupant protection device 20 of the first embodiment, the recess for fitting the lap belt portion 6b is not formed in the airbag 22, but the second embodiment of the airbag 22 having the configuration of the first embodiment. As described above, a concave portion may be provided at a portion corresponding to the lap belt portion 6b. In this case, the effects (1) to (3) of the first embodiment and the effects (4) and (5) of the second embodiment can be achieved together.

  In the occupant protection device 20 of the first embodiment, the portion corresponding to the lap belt portion 6b of the airbag 22 is substantially the same height as the lap belt portion 6b, but the airbag 22 is similar to the second embodiment. You may make it make the height of the site | part corresponding to this lap belt part 6b in lower than the lap belt part 6b. Thereby, even if the airbag 22 is inflated, it is possible to reliably suppress the lap belt portion 6b from being pushed up, so that the so-called submarine phenomenon can be reliably suppressed. In the second embodiment, the recess 122c of the airbag 122 is set lower than the lap belt portion 6b. However, the recess 122c may be equal to or higher than the height of the lap belt portion 6b. Even in such a case, since the concave portion 122c is formed in the airbag 122, it is possible to suppress the displacement of the airbag 122 due to the lap belt portion 6b.

  In the first embodiment, the airbag 22 is inflated from the front end portion of the backrest portion 3 to substantially the center of the seat portion 2, and the front portion 22a and the rear portion with the lap belt portion 6b of the airbag 22 as a boundary. Although the volume ratio with the portion 22b is set to 3/7 to 7/3, any of the configurations specified by the size and the volume ratio may be adopted. Even in such a case, it is possible to suitably suppress the displacement of the airbag 22 due to the lap belt portion 6b.

  The occupant protection device of each of the embodiments described above includes an airbag that inflates on the buckle side, which is the other side of the lap belt portion 6b, but the airbag is an anchor that is one side of the lap belt portion 6b. It may expand on the side.

1 is a perspective view of a vehicle seat to which an occupant protection device according to a first embodiment of the present invention is applied. It is the figure which expanded and showed the passenger protection device, (a) is a perspective view, (b) is a front view. It is a figure which shows the state in which the passenger | crew sat down on the vehicle seat, (a) is a front view before expansion | swelling of an airbag, (b) is a front view at the time of expansion | swelling. It is a figure which shows the state in which the passenger | crew sat on the vehicle seat, (a) is the side view which looked at the passenger from the left side of the vehicle before the airbag is inflated, (b) the passenger was seen from the left side of the vehicle when inflated Side view. The perspective view of the vehicle seat to which the passenger | crew protection device concerning 2nd Embodiment of this invention was applied. The perspective view of the vehicle seat to which the passenger protection device concerning the 1st modification of the present invention was applied. The perspective view of the vehicle seat to which the passenger | crew protection device concerning the 2nd modification of this invention was applied. The perspective view of the vehicle seat to which the passenger | crew protection device concerning the 3rd modification of this invention was applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Seat part, 3 ... Backrest part, 4 ... Headrest, 5 ... Seat belt, 6 ... Webbing, 6a ... Shoulder belt part, 6b ... Lap belt part, 7 ... Tongue, 7a ... Sliding part , 7b ... engaging portion, 8 ... buckle, 8a ... insertion port, 8b ... connection portion, 9 ... retainer, 10, 210, 310 ... buckle device, 20, 120, 220, 320, 420 ... occupant protection device, 21 ... Inflator, 21a ... supply pipe, 22, 122 ... airbag, 22a, 122a ... front part, 22b, 122b ... rear part, 23 ... case, 30 ... console box, 122c ... concave part.

Claims (5)

At the time of a vehicle collision, at least one of the one side and the other side between the lap belt portion of the seat belt and the occupant, which is stretched horizontally in front of the occupant's waist from one side of the seat to the other side. A vehicle occupant protection device having an airbag that inflates on either side,
The airbag is formed such that the volume ratio of the front portion and the rear portion with respect to the traveling direction of the vehicle at the time of inflation is 3/7 to 7/3, with the lap belt portion of the seat belt as a boundary. An occupant protection device for a vehicle. At the time of a vehicle collision, at least one of the one side and the other side between the lap belt portion of the seat belt and the occupant, which is stretched horizontally in front of the occupant's waist from one side of the seat to the other side. A vehicle occupant protection device having an airbag that inflates on either side,
The vehicle occupant protection device according to claim 1, wherein a recess is formed when the airbag is inflated at a portion corresponding to a lap belt portion of a seat belt. At the time of a vehicle collision, at least one of the one side and the other side between the lap belt portion of the seat belt and the occupant, which is stretched horizontally in front of the occupant's waist from one side of the seat to the other side. A vehicle occupant protection device having an airbag that inflates on either side,
The airbag is formed so as to be inflated from at least an end portion of the seat back on the vehicle traveling side to a substantially center with respect to the vehicle traveling direction of the seat portion of the seat. apparatus. In any one of Claims 1-3,
The vehicle occupant protection device according to claim 1, wherein a height of a portion of the airbag corresponding to the lap belt portion of the seat belt is lower than a height of the lap belt portion when the occupant wears the seat belt. In any one of Claims 1-4,
The vehicle occupant protection device according to claim 1, wherein the airbag is housed in a buckle device having a buckle to which a tongue of a seat belt is attached before inflating.

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