JP4853408B2 - Airbag device - Google Patents

Description

  The present invention relates to a twin chamber (chamber means an air chamber) type airbag apparatus that expands and inflates at the time of a vehicle front collision and restrains an occupant from the front.

In a conventional single-chamber airbag device, the chamber is deployed and inflated at the time of a vehicle front collision, and restrains the center of the chest and the head of the occupant from the front.
In order to restrain an occupant softer than a single chamber, an airbag apparatus having a twin chamber has been proposed.

  Patent Document 1 discloses a twin chamber type airbag apparatus. The airbag device includes left and right chambers and tie panels that connect the left and right chamber occupant-side tips. The left and right chambers expand and expand when the front of the vehicle collides. The left and right chambers restrain the costal cartilage or its vicinity, and the tie panel softly restrains the occupant's center and head that enter the recess between the left and right chambers. To do.

  Patent Document 2 discloses a twin chamber type airbag device. The airbag device includes left and right chambers and a connecting cloth provided between the left and right chambers in the back of the recess between the left and right chambers. The left and right chambers expand and expand when the vehicle collides, and the left and right chambers restrain the left and right shoulders of the occupant (portions above the armpits), and the center of the occupant's chest is softly received by the connecting cloth.

In the conventional twin chamber, the restraint of the occupant's chest by the tie panel or connecting cloth is the same as the restraint of the occupant by the single chamber and the center of the occupant's chest in the left-right direction (the sternum and costal cartilage). Similar and presents the same challenges.
JP 2003-335203 A JP 2007-38812 A

In order to further reduce the occupant injury during a frontal collision in response to the increasing demand for collision safety performance, it is necessary to absorb the kinetic energy of the occupant with a higher restraining force.
On the other hand, the single chamber type airbag device and the conventional twin chamber type airbag device that restrains the occupant at the center of the chest have the following problems for improving the restraining force. This problem will be described with reference to FIGS. 12 to 16 show a single chamber type airbag apparatus, the conventional twin chamber type airbag apparatus has the same problem.

In the conventional airbag 11P, the occupant 1 receives an input (restraint force) 6 from an airbag, a tie panel, or a connecting cloth at the front end of the rib (the sternum 2 at the center in the left-right direction of the chest) at the time of a frontal collision (see FIGS. 12 to 12). FIG. 14). This is the shape in which the airbag deployment shape is in contact with the sternum 2 or shark cartilage 3 of the occupant (arch shape shown in FIG. 15, tie panel, stretched planar shape in the case of connecting cloth), This is because the four radial bones are separated from the deployed airbag 11P in the vehicle longitudinal direction (FIG. 16).
as a result,
(A) The airbag 11P is input to the sternum 2 and the low-rigid cartilage portion (costal cartilage 3) that supports the sternum 2 in both the single chamber type and the twin chamber type. Since the rigidity of the costal cartilage 3 is not large, it is difficult to improve the restraining force. That is, it is difficult to increase the airbag output and increase the restraining force of the airbag.
(B) Due to the offset from the force point (FIG. 14A), the moment (M = offset amount W × input L) at the four radial bone sites (FIG. 14B) increases on the side of the chest. The upper limit of the force is determined by the strength of moment of the radial bone 4 site (b) on the side of the chest, and the moment strength of the radial bone 4 site (b) is limited. . That is, it is difficult to increase the airbag output and increase the restraining force of the airbag.
Due to the above (a) and (b), the airbag output is limited, and it is difficult to increase the airbag output and absorb the kinetic energy of the occupant with a higher restraining force.

  The objective of this invention is providing the airbag apparatus which can improve restraint force rather than the conventional airbag apparatus which restrained the passenger | crew in the chest center.

The present invention for solving the above problems or achieving the above object is as follows.
(1) An airbag device including an airbag having left and right chambers,
Left and right chambers when airbag deployment, have a shape to press the portions of the ribs bone of the occupant of the ribs,
The shape of pressing the left and right chambers of the left and right chambers is such that each of the left and right chambers has an upper side and a lower side extending from the upper side and two side sides longer than the upper side as viewed from the front of the passenger. Including the shape of the isosceles triangle with rounded corners, the opposite sides of the left and right chambers are close to each other at the upper end of the opposite sides and gradually away downward. ,
An airbag device in which a gap between the sides of the left chamber and the right chamber facing each other is a gap that increases downward, and the positions of the sternum and costal cartilage of the occupant are behind the gap .
( 2 ) The shape of pressing the left and right chambers of the occupant's calcaneus is a substantially right-angled triangle with the left and right chambers having two sides that are substantially orthogonal to the hypotenuse in plan view as viewed from above the occupant. Including a shape in plan view, having a shape with rounded corners, the oblique sides opposite to each other of the left chamber and the right chamber being close to each other at the front end of the opposite oblique side and gradually separating backward;
Between the hypotenuses of the left and right chambers facing each other is a recess that increases in width toward the rear and opens toward the rear, and the position of the sternum and costal cartilage of the occupant is behind the recess ( 1) The airbag apparatus as described .
( 3 ) The airbag device according to (1) or (2) , wherein the left and right chambers have a concave-shaped portion in a portion corresponding to a head of an occupant when the airbag is deployed and inflated.

According to the airbag device of (1) above, the left and right chambers have a shape that pushes the radial bone portion of the occupant's rib when the airbag is deployed and inflated. The kinetic energy of the occupant can be absorbed with a higher restraining force by increasing the airbag output (airbag pressure).
According to the airbag device of ( 1 ) above, the shape of pushing the left and right chambers of the occupant's ribs extends to the upper side and the lower side of the left and right chambers as viewed from the front of the occupant. The corners of an approximately isosceles triangle having two sides longer than the upper side are rounded, and the opposite sides of the left and right chambers are close to each other at the upper end of the opposite side and gradually downward. The gap between the opposing sides of the left chamber and the right chamber is a gap that increases in the downward direction, and the position of the sternum and costal cartilage of the occupant is the gap. because of the rearward correspond to the shape of the ribs bone away gradually close above downward, left and right chambers can press portions of the occupant of the rib bone, do not press the occupant sternum and costal cartilage Ru can be so.
According to the airbag device of ( 2 ) above, the shape of the left and right chambers that pushes the occupant's ribs is the two sides that are substantially orthogonal to the hypotenuse in plan view when the left and right chambers are viewed from above the occupant, respectively. The shape of the plan view has a shape in which the corners of a substantially right triangle with rounded corners are rounded, and the hypotenuses of the left and right chambers facing each other are close to each other at the front end of the counter hypotenuse and gradually separated rearward. In addition, a space between the oblique sides of the left chamber and the right chamber facing each other is a recess that increases in width toward the rear and opens toward the rear, and the position of the sternum and costal cartilage of the occupant is behind the recess The left and right chambers can push the occupant's calcaneus portion, prevent the occupant's sternum and costal cartilage from being pushed, and absorb the physique difference of the occupant by the restrained position. The large occupant is restrained at the rear end portions of the left and right chambers, and the small occupant is restrained at the side of the concave portion between the left and right chambers, and thus at a position spaced forward from the rear end portions of the left and right chambers.
According to the airbag device of ( 3 ) above, the left and right chambers have the concave-shaped portion at the portion that hits the head of the occupant when the airbag is deployed and inflated, so the reaction force on the head, particularly the face, can be reduced.

Below, the airbag apparatus of this invention is demonstrated with reference to FIGS.
1 to 8 show Embodiment 1 of the present invention, FIGS. 9 and 10 show Embodiment 2 of the present invention, and FIG. 11 shows Embodiment 3 of the present invention. Portions that are applicable to any embodiment of the present invention are labeled with the same reference numerals throughout all embodiments of the present invention. 3 and 4, X indicates the rear in the vehicle front-rear direction, Y indicates the vehicle left-right direction, and Z indicates the upper side.

[Example 1]
The structure of the airbag apparatus 10 of Example 1 of this invention is demonstrated with reference to FIGS.
The airbag device 10 of the present invention is folded and stored in an instrument panel in front of a passenger seat of a vehicle or in a non-rotating pad in the center of a steering wheel in front of a driver's seat. It is a device that is deployed and inflated rearward (including when a collision is predicted) and restrains the occupant from the front.

  An airbag apparatus 10 according to the present invention is connected to an airbag 11 having left and right (left and right, front and rear) chambers (air chambers) 12 and 13, and left and right chambers (air chambers) 12 and 13. An inflator for supplying inflation gas to the bag; The left and right chambers 12 and 13 are preferably independent of each other. However, the left and right chambers 12, 13 may communicate with each other at the front end.

  The left and right chambers 12 and 13 are expanded and expanded at the time of a frontal collision of the vehicle (including a collision prediction time), and when expanded and expanded, a center line extending in the vehicle front-rear direction between the left and right chambers 12 and 13 is They have shapes that are symmetric or nearly symmetric to each other. The walls of the chambers 12 and 13 (hereinafter, both the wall of the chamber and the internal space of the chamber are referred to as the chambers 12 and 13) are made of a flexible material such as cloth. The cloth is made of woven or non-woven fabric, and the cloth yarn may be made of resin, for example.

  As shown in FIG. 3, the left and right chambers 12, 13 are arranged so that the upper end of the head 5 of the occupant (including the case of the doll model of the occupant) 1 is located above or above the shoulder of the occupant 1. It is located below the upper end, and the lower end is located at or near the lower end of the rib. As shown in FIGS. 4 and 5, the left and right outer ends of the left and right chambers 12 and 13 are at or near the left and right outer ends of the chest of the occupant 1. Particularly for the small occupant 1B, the left and right outer ends of the chambers 12 and 13 are located outside the outer end of the chest of the occupant 1.

  The left and right chambers 12 and 13 are shaped so as to push the ribs 4 of the ribs of the occupant 1 from the front to the rear when the airbag 11 is deployed and inflated (the input from the airbag 11 is within the ribs of the occupant 1 A shape that fits into the portion of the heel bone 4. The left and right chambers 12 and 13 have a shape in which the portions of the sternum 2 and costal cartilage 3 of the occupant 1 are not pushed backward when the airbag 11 is deployed and inflated. Here, the occupant 1 targeted when determining the shape of the airbag is, for example, an occupant of AM50 having an average physique of an adult male.

  FIG. 2 is a front perspective view of the passenger 1 as seen from the front. In FIG. 2, the occupant 1 has a sternum 2, a costal cartilage 3 connected to the sternum 2, and a costal bone 4 connected to the costal cartilage 3, and the costal bone 4 is curved from the front to the rear on the side of the chest of the occupant. It is connected to a rigid vertebra (spine) on the back of the sternum. The costal cartilage 3 has low rigidity and absorbs the expansion and contraction of the lungs during respiration by deformation. The costal bone 4 is more rigid than the costal cartilage 3. The left-right spacing between the connecting portions of the left and right radial bones 4 with the costal cartilage 3 increases downward. The distance between the left and right costal cartilages 3 in the left-right direction of the connecting portion with the calcaneus bone 4 extends downward.

  Conventionally, the input from the airbag 11 at the time of the front collision of the vehicle has entered the rib cartilage 3 of the ribs of the occupant 1, but in the present invention, the input from the airbag 11 at the time of the front collision of the vehicle is the occupant 1 The left and right chamber shapes are set so as to enter the portion of the calcaneus 4 (the front portion 4a of the longitudinally curved portion of the calcaneus, the portion surrounded by a dotted line in FIGS. 6 and 7).

  In the front view of the occupant in FIG. 3, in order to push the portions of the left and right chambers 12, 13 of the calcaneus 4 of the occupant 1, the chamber shape is close to the upper part and gradually separates downward. The left and right chambers 12 and 13 are substantially isosceles triangular angles having upper sides 12a and 13a and two side sides 12b, 12c, 13b, and 13c that extend downward and are longer than the upper sides 12a and 13a, respectively, in a front view. It has a rounded shape. The side sides 12b and 13b of the left chamber 12 and the right chamber 13 facing each other are close to each other at the upper side (may be in contact with each other at the upper end portion or in the vicinity thereof) and gradually separated downward. A space 14 between the left and right sides 12 b and 13 b of the left chamber 12 and the right chamber 13 facing each other is a gap 14 that increases in width downward (expands downward). The costal cartilage 3 is positioned behind the gap 14. As a result, the restraining force from the left and right chambers 12 and 13 to the occupant 1 enters only the portion of the calcaneus 4 of the occupant 1 and does not enter the portion of the sternum 2 and the costal cartilage 3 of the occupant 1. .

  4, the left and right chambers 12 and 13 for pushing the portion of the calcaneus 4 of the occupant 1 are shaped so that the distance between the left and right chambers 12 and 13 is close to the front and gradually toward the rear. It has a shape that leaves. The left and right chambers 12 and 13 each have a shape obtained by rounding corners of a substantially right triangle having two sides 12e, 12f, 13e, and 13f that are substantially orthogonal to the hypotenuses 12d and 13d in plan view. The oblique sides 12d and 13d of the left chamber 12 and the right chamber 13 facing each other are close to each other in the front (may be in contact at the front end portion or in the vicinity thereof) and gradually separated toward the rear. Between the hypotenuses 12d and 13d of the left chamber 12 and the right chamber 13 facing each other, there is a recess 15 that increases in width rearward and opens rearward, and the sternum 2 of the occupant 1 and the costal cartilage 3 Is positioned behind the recess 15. Thereby, the restraining force from the left and right chambers 12 and 13 to the occupant 1 enters only the portion of the calcaneus 4 of the occupant 1 and does not enter the portion of the sternum 2 and the costal cartilage 3 of the occupant 1. .

  Further, the shape of pushing the portions of the left and right chambers 12 and 13 of the calcaneus bone 4 of the occupant 1 is a shape that approaches the front and gradually separates toward the rear, as shown in FIG. A physique difference of 1 is absorbed by the restraint position. The large handle occupant 1A is restrained at or near the rear end portion of the airbag 11, and the small handle occupant 1B is restrained at a position ahead of the rear end portion of the airbag 11 (at a position that is recessed into the recess 15). As a result, the pressure receiving area is reduced for the small occupant 1B and excessive restraining force is not achieved, and a large amount of movement in the front-rear direction can be obtained for the large occupant 1A, and the amount of energy absorption (reaction force × (Movement amount) can be increased.

  The left and right chambers 12 and 13 may have only one of the structures shown in FIGS. 3 and 4, or may have a structure that takes both the structures shown in FIGS. 3 and 4. If both the structure of FIG. 3 and FIG. 4 are taken, the shape of the chambers 12 and 13 becomes a solid wedge shape like FIG. In this case, it is desirable that the lower end portions of the left and right chambers 12 and 13 are in the upper end region of a substantially right triangle of the left and right chambers 12 and 13 in the plan view of FIG. Therefore, the rear end portions of the chambers 12 and 13 are inclined forward from the upper side to the lower side. Therefore, when the occupant 1 hits the chambers 12 and 13, it first hits the upper portions of the chambers 12 and 13, and the contact portion increases downward while including the upper portions.

As shown in FIGS. 8A, 8B and 8C, the wedge-shaped left and right chambers 12 and 13 include an upper piece 16 having a substantially right triangle and side pieces 17 and 18 having an isosceles triangle. , 19 and stitching at the side. Prior to stitching, the widthwise central portions of the side pieces 17, 18, 19 are connected by a single tether 20 (connecting portion 21). When the airbag is deployed and inflated, the chambers 12, 13 are It is possible to maintain a substantially triangular cross section without making the cross section circular. After the connection by the tether 20, the upper piece 16 and the side pieces 17, 18, 19 are stitched at the side (sewn portion 22) to form wedge-shaped chambers 12, 13.
The above applies to the embodiments of the present invention other than the first embodiment of the present invention.

The first embodiment of the present invention further has the following configuration.
The airbag apparatus 10 according to the first embodiment of the present invention is folded and housed inside an instrument panel in front of a passenger seat. When a vehicle front collision is detected or predicted, the airbag apparatus 10 is deployed and inflated rearward to Restrain from the front.

Next, operations and effects of the first embodiment of the present invention will be described.
First, in the airbag device 10 of the present invention, the left and right chambers 12 and 13 are shaped to push the portion of the ribs 4 of the ribs of the occupant 1 when the airbag 11 is deployed and inflated. This restraining force can be increased compared to the case where the airbag 11 pushes the costal cartilage 3. As a result, it is allowed to increase the airbag output (airbag pressure), and by increasing the airbag output (airbag pressure), the occupant 1 is restrained with a higher restraining force than before, and the occupant 1 is inertial when the vehicle collides. It is possible to absorb more kinetic energy of the occupant 1 by restraining the forward movement by force with a high reaction force.

  Moreover, the shape which pushes the part of the left and right chambers 12 and 13 of the calcaneus bone 4 of the passenger | crew 1 becomes a shape which adjoins upwards as shown in FIG. Therefore, the shape of the chamber 11 corresponds to the shape of the teleost bone 4 (the shape shown in FIGS. 2 and 6) that is close to the upper side and gradually moves downward, and the left and right chambers 12 and 13 correspond to the occupant 1. Only the portion of the heel bone 4 can be pushed. In this case, the left and right chambers 12 and 13 do not push the sternum 2 and costal cartilage 3 of the occupant 1.

  That is, the opposite sides 12b and 13b of the left chamber 12 and the right chamber 13 are close to each other on the upper side (may be in contact with each other at the upper end portion or in the vicinity thereof) and gradually separated downward. Therefore, a gap 14 whose width increases downward is formed between the opposite sides 12b and 13b of the left chamber 12 and the right chamber 13. As a result, the sternum 2 and the costal cartilage 3 of the occupant 1 are located behind the gap 14. As a result, the restraining force on the occupant 1 from the left and right chambers 12 and 13 enters only the portion of the calcaneus 4 of the occupant 1 and does not enter the portion of the sternum 2 and the costal cartilage 3 of the occupant 1, so It is possible to prevent an excessive load from being applied to the low sternum 2 and costal cartilage 3.

  Moreover, the shape which pushes the part of the left and right chambers 12 and 13 of the calcaneus bone 4 of the occupant 1 is a shape that approaches the front and gradually separates backward as shown in FIG. Therefore, the oblique sides 12d and 13d of the left chamber 12 and the right chamber 13 facing each other are close to each other in the front (may be in contact at the front end portion or in the vicinity thereof) and gradually separated toward the rear. That is, between the hypotenuses 12d and 13d of the left chamber 12 and the right chamber 13 that face each other, a recess 15 that increases in width toward the rear and opens toward the rear is formed. The cartilage 3 is positioned behind the recess 15. As a result, the restraining force from the left and right chambers 12 and 13 to the occupant 1 enters only the portion of the calcaneus 4 of the occupant 1 and does not enter the portion of the sternum 2 and the costal cartilage 3 of the occupant 1, and the sternum having low rigidity It is possible to prevent an excessive load from being applied to the portions 2 and costal cartilage 3.

Moreover, the shape which pushes the part of the left and right chambers 12 and 13 of the calcaneus bone 4 of the occupant 1 is a shape that approaches the front and gradually separates backward as shown in FIG. Therefore, as shown in FIG. 5, the physique difference of the passenger 1 is absorbed by the restraint position. In this case, the large occupant 1A is restrained at or near the rear end of the bag 11, and the small occupant 1B is restrained at a position ahead of the rear end of the bag 11. As a result, the pressure receiving area is small for the small occupant 1B and excessive restraining force is not achieved, and the large amount of movement in the front-rear direction can be obtained for the large occupant 1A, thereby increasing the amount of energy absorption ( It is possible to increase the movement amount of the reaction force × the movement amount).
The above effects are also applied to the embodiments of the present invention other than the first embodiment of the present invention.

In the first embodiment of the present invention, the following actions and effects can be obtained.
Since the airbag apparatus 10 according to the first embodiment of the present invention is provided inside the instrument panel in front of the passenger seat, the deployment and inflation of the airbag 11 is not limited by the arrangement of the steering wheel and is performed independently. Can be done.

[Example 2]
As shown in FIGS. 9 and 10, the airbag apparatus 10 according to the second embodiment of the present invention is similar to the airbag apparatus 10 according to the first embodiment of the present invention in the head 5 ( In particular, a concave shape portion 23 (a shape that becomes concave toward the head) is formed in a state where the chamber 11 is inflated at a portion that receives the jaw or cheek portion of the face.

  In the front view of FIG. 9, the concave portion 23 has a shape that can receive the chin of the occupant 1 from below. Further, in the plan view of FIG. 10, the concave-shaped portion 23 has a shape opened rearward so as not to rub the cheek of the occupant 1 with an excessive load. In order to form the concave portion 23, the concave portion 23 of the chambers 12, 13 is pulled from the inside of the chambers 12, 13 by the tether 24 as indicated by a dotted line in FIG.

  With respect to the operation and effect of the second embodiment of the present invention, the left and right chambers 12 and 13 have the concave portion 23 in the portion that contacts the head 5 of the occupant 1 when the airbag 11 is deployed and inflated. The reaction force to can be reduced. At the time of a frontal collision of the vehicle, the occupant 1 moves forward while taking a forward leaning posture due to the presence of the lap belt, but the concave shape portion 23 softens the chin portion in a plane parallel to the chin portion and a large surface. Can receive. Also, there is little rubbing of the cheek, and the cheek can be softly received on the front end of the concave shaped portion 23 on a surface that is substantially parallel to the cheek and wide.

Example 3
As shown in FIG. 11, the airbag apparatus 10 according to the third embodiment of the present invention is disposed in front of the driver's seat, folded and stored in the pad 26 of the steering wheel 25, and deployed and inflated toward the occupant 1 when a vehicle front collision occurs. Is done. Since the airbag 11 is asymmetrical, the airbag apparatus 10 is provided so as not to rotate even if the steering wheel 25 rotates.

  As for the effects of the third embodiment of the present invention, since the airbag device 10 is disposed in front of the driver's seat, the driver is protected from the primary collision and the secondary collision at the time of the frontal collision of the vehicle. Further, since the airbag device 10 is housed in the pad 26 of the steering wheel 25 in a non-rotating manner, the left and right chambers 12 and 13 can be made to correspond to the left and right sides of the driver even during steering so that the driver can be restrained correctly. it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view of an airbag device and an occupant of Example 1 of the present invention (also applied to examples other than Example 1). It is a front perspective view when a passenger | crew is seen from the front. It is a front view of the airbag apparatus and passenger | crew of Example 1 of this invention (it applies also to Examples other than Example 1). It is a top view of the airbag apparatus and passenger | crew of Example 1 of this invention (it applies also to Examples other than Example 1). It is a plane perspective view of the airbag apparatus of Example 1 of this invention, and a passenger | crew of a large pattern and a small pattern (it applies also to Examples other than Example 1). FIG. 3 is a front perspective view of a portion where an airbag pushes the occupant, surrounded by a dotted line, when the occupant is viewed from the front (also applied to embodiments other than the first embodiment). FIG. 3 is a plan view of an occupant, in which a portion where an airbag pushes the occupant is surrounded by a dotted line (also applied to examples other than Example 1). It is a perspective view which shows the preparation methods of an airbag (it applies also to Examples other than Example 1). It is a front view of the airbag apparatus and passenger | crew of Example 2 of this invention. It is a top view of the airbag apparatus and passenger | crew of Example 2 of this invention. It is a front view of the airbag apparatus and passenger | crew of Example 3 of this invention. It is the front view of the conventional single chamber type airbag apparatus and a passenger | crew. FIG. 6 is a plan view of a conventional single chamber airbag device and an occupant. It is the top view of the conventional single chamber type airbag apparatus and a passenger | crew which showed how to apply a moment. FIG. 3 is a plan view of a part of a conventional single chamber that is expanded and inflated. FIG. 2 is a plan view of a part of a conventional single chamber and an occupant that is expanded and inflated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crew 1A Large sized occupant 1B Small sized occupant 2 Sternum 3 Bone cartilage 4 Bone bone 5 Head 10 Airbag device 11 Airbag 12, 13 Left and right chamber 14 Gap 15 Recess 16 Upper piece 17, 18, 19 Side piece 20 Tether 21 Connection Part 22 stitching part 23 concave part 24 tether 25 steering wheel 26 pad

Claims (3)

An airbag device including an airbag having left and right chambers,
Left and right chambers when airbag deployment, have a shape to press the portions of the ribs bone of the occupant of the ribs,
The shape of pressing the left and right chambers of the left and right chambers is such that each of the left and right chambers has an upper side and a lower side extending from the upper side and two side sides longer than the upper side as viewed from the front of the passenger. Including the shape of the isosceles triangle with rounded corners, the opposite sides of the left and right chambers are close to each other at the upper end of the opposite sides and gradually away downward. ,
An airbag device in which a gap between the sides of the left chamber and the right chamber facing each other is a gap that increases downward, and the positions of the sternum and costal cartilage of the occupant are behind the gap . The shape of the left and right chambers that pushes the occupant's ribs is the corner of a substantially right triangle having two sides that are substantially perpendicular to the hypotenuse when viewed from above the occupant. A plan view shape having a rounded shape, wherein the opposite hypotenuses of the left chamber and the right chamber are close to each other at the front end of the opposite hypotenuse and gradually separated rearward;
A space between opposite hypotenuses of the left chamber and the right chamber is a recess that increases in width toward the rear and opens toward the rear, and the sternum and costal cartilage of the occupant are behind the recess. Item 2. The airbag device according to Item 1 . The airbag device according to claim 1 , wherein the left and right chambers have a concave portion in a portion that contacts the head of an occupant when the airbag is deployed and inflated.

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