JP2010162945A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To correctly lay an occupant restraint surface in a vehicle width direction in deployment of an airbag. <P>SOLUTION: When the airbag 16 abuts on a front windshield 36 inclined relative to a vehicle width direction in a process where the airbag 16 is deployed, the airbag 16 is deployed in a direction inclined relative to a longitudinal direction (direction perpendicular to front windshield 36) and the occupant restraint surface 35 is inclined relative to the vehicle width direction. However, since out of first and second side part deployment surfaces 31, 32 of the airbag 16, the first side part deployment surface 31 abutted on an inner portion in a vehicle width direction of the front windshield 36 and deployed to a rear side of a vehicle body is formed longer than the second side part deployment surface 32b abutted on an outer portion in a vehicle width direction of the front windshield 36 and deployed to a rear side of the vehicle body (L1>L2), the occupant restraint surface 35 is laid in a vehicle width direction and an occupant can be certainly restrained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a first side in which an airbag that expands toward the rear of the vehicle body from a position along the front windshield with gas generated by an inflator abuts against an inner portion in the vehicle width direction of the front windshield and expands toward the rear of the vehicle body. A deployment surface, a second side deployment surface that abuts against an outer portion of the front windshield in the vehicle width direction and deploys rearward of the vehicle body, and an occupant connected to the deployment direction front end of the first and second side deployment surfaces. It is related with the airbag apparatus provided with the passenger | crew restraint surface which opposes.

Deploy the airbag by sewing the buttocks formed on the upper and lower walls of the passenger seat airbag so that they can be broken, and breaking the sewing to release the buttock while the airbag is deployed. One that reduces the speed is known from US Pat.
Japanese Patent Laid-Open No. 2-20458

  By the way, when the airbag is deployed from the position along the front windshield toward the rear of the vehicle body with the gas generated by the inflator, the inner surface of the front windshield with which the airbag abuts is inclined with respect to the vehicle width direction. Therefore, the reaction force received from the front windshield causes the airbag deployment direction to be inclined with respect to the longitudinal direction of the vehicle body, and the airbag occupant restraint surface is inclined with respect to the vehicle width direction, making it impossible to reliably restrain the occupant. there is a possibility.

  The present invention has been made in view of the above circumstances, and an object thereof is to correctly align an occupant restraint surface in the vehicle width direction when an airbag is deployed.

  In order to achieve the above object, according to the first aspect of the present invention, an airbag that expands toward the rear of the vehicle body from a position along the front windshield with gas generated by an inflator is a vehicle of the front windshield. A first side development surface that abuts against the inner portion in the width direction and develops rearward of the vehicle body; a second side development surface that abuts the outer portion of the front windshield in the vehicle width direction and develops rearward of the vehicle body; 1. An airbag device comprising: an occupant restraint surface that faces an occupant and continues to a distal end of the second side deployment surface in the deployment direction. The first side deployment surface is longer in the front-rear direction than the second side deployment surface. An airbag device is proposed in which the length is long.

  According to the invention described in claim 2, in addition to the configuration of claim 1, the first and second side development surfaces are joined by joint parts that can be polymerized in the front-rear direction and broken. There is proposed an airbag device comprising first and second collars, wherein the first and second collars have the same amount of polymerization.

  According to the invention described in claim 3, in addition to the configuration of claim 2, the distance from the front windshield of the first flange portion is the distance from the front windshield of the second flange portion. An airbag device is proposed which is characterized in that it is larger.

  According to the invention described in claim 4, in addition to the structure of claim 1, the first and second side development surfaces are joined by joint parts that can be polymerized in the front-rear direction and broken. There is proposed an airbag apparatus including first and second flange portions, wherein the polymerization amount of the first flange portion is set larger than the polymerization amount of the second flange portion.

  According to the invention described in claim 5, in addition to the configuration of any one of claims 2 to 4, the direction of the heel of the first and second flange parts is set to the direction in which the airbag is deployed. An airbag device is proposed that is inclined with respect to the air bag.

  According to the invention described in claim 6, in addition to the structure of any one of claims 2 to 5, the hooks of the first and second flange parts are directed toward the inside of the airbag. An airbag apparatus characterized by protruding is proposed.

  In addition, 1st, 2nd sewing S1, S2 of embodiment respond | corresponds to the junction part of this invention.

  According to the configuration of the first aspect, when the airbag is in contact with the front windshield that is inclined with respect to the vehicle width direction in the process of deployment, the airbag is inclined with respect to the front-rear direction (with respect to the front windshield). The occupant restraint surface is tilted with respect to the vehicle width direction when it is deployed in the direction orthogonal to the vehicle width direction, but it hits the vehicle width direction inner portion of the front windshield on the first and second side deployment surfaces of the airbag. Since the first side development surface that comes into contact with the vehicle body and extends rearward is formed longer than the second side portion development surface that abuts the outer portion of the front windshield in the vehicle width direction and extends rearward of the vehicle body, The occupant can be reliably restrained along the vehicle width direction.

  According to the second aspect of the present invention, the first and second side surface deployment surfaces are provided with the first and second flange portions having the same polymerization amount, and the joint portion is broken in the process of deploying the airbag. Since the polymerization of the first and second collars is solved, the airbag can be fully deployed while the internal pressure of the airbag is increased early and the direction of the occupant restraint surface is stabilized.

  According to the third aspect of the present invention, since the distance from the front windshield of the first saddle portion is larger than the distance from the front windshield of the second saddle portion, the airbag is separated from the portion on the front windshield side. In the process of inflating toward the occupant restraint surface side, the timings at which the first and second side development surfaces are deployed to the positions of the first and second collars coincide. If only one of the first and second side deployment surfaces is deployed to the positions of the first and second collars, the occupant comes into contact with the occupant restraint surface and the internal pressure of the airbag increases. There is a possibility that only one of the second buttocks is unpolymerized and stretches, and the occupant restraint surface is inclined. However, by making the distance from the front windshield of the first collar part larger than the distance from the front windshield of the second collar part, both the first and second side development surfaces are simultaneously When the occupant comes into contact with the occupant restraint surface after that, the position of the occupant restraint surface can be prevented by simultaneously solving the overlapping of the first and second buttock portions. it can.

  According to the fourth aspect of the present invention, the first side portion deployment surface is provided with the first collar portion having a large polymerization amount, and the second side portion deployment surface is provided with the second collar portion having a small polymerization amount. In the process of deployment, the joint portion is broken to release the polymerization of the first and second flanges. Therefore, when the airbag is deployed halfway and the joint portion breaks, the airbag is still in contact with the front windshield. Even if a moment for inclining the airbag is not generated, it is possible to prevent the occupant restraint surface from inclining with respect to the vehicle width direction by making the shape of the airbag right and left symmetrical. After that, when the airbag inclines against the front windshield, the joint is broken and the polymerization of the first and second flange parts with different polymerization amounts is released, so that the inclination by the abutment with the front windshield Can be compensated by the difference between the lengths of the first and second side development surfaces to prevent the occupant restraint surface from tilting.

  According to the fifth aspect of the present invention, since the direction of the heel of the first and second heel portions is inclined with respect to the airbag deployment direction, the joint portion of the first and second heel portions is rearward from the front end side. It can be smoothly broken toward the end side.

  According to the structure of claim 6, since the ridges of the first and second flange portions are protruded toward the inside of the airbag, the joint portion breaks and the polymerization of the first and second flange portions can be solved. In addition, the first and second side development surfaces formed with the first and second collars are less likely to spread in the vehicle width direction, and the occupant restraint surface can be reliably stroked in the front-rear direction.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 6 show a first embodiment of the present invention. FIG. 1 is a perspective view of a front part of a passenger compartment of an automobile, FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. FIG. 4 is a view corresponding to FIG. 2 showing a state after the airbag has been deployed, FIG. 4 is a perspective view showing the shape of the airbag in the middle of deployment, FIG. 5 is an explanatory view of the airbag deployment process (part 1), FIG. 6 is an explanatory diagram (part 2) of the airbag deployment process.

  As shown in FIG. 1, an airbag device 13 is provided on an instrument panel 12 positioned in front of a passenger seat 11 of an automobile. The airbag device 13 includes two lids 15 and 15 that open and close a rectangular opening 14 (see FIG. 3) formed in the instrument panel 12, and these lids 15 and 15 are integrally formed with the instrument panel 12. Is done.

  As shown in FIGS. 2 and 3, a thin fracture portion 12 a that defines the outer edges of the lids 15, 15 is formed on the lower surface of the instrument panel 12, and the fracture portion 12 a breaks when the airbag 16 is deployed. Thus, the opening 14 is formed by opening the lids 15 and 15. A metal reinforcing plate 17 formed in a rectangular frame shape is fixed to the lower surface of the instrument panel 12 surrounding the opening 14. A pair of front and rear belt-like bent portions 17b and 17b are integrally formed on the inner periphery of the fixing portion 17a of the reinforcing plate 17 fixed to the instrument panel 12, and these bent portions 17b and 17b are formed in the opening 14. The instrument panel 12 extends downward along the front and rear edges of the instrument panel 12. A plurality of L-shaped extensions 17c... Extend downward from the lower end of each bent portion 17b.

  The front edge of the front lid 15 and the rear edge of the rear lid 15 are supported by the instrument panels 12 before and after the opening 14 via metal hinge plates 18 and 18 so as to be freely opened and closed. Each hinge plate 18 includes a fixed portion 18a that is superimposed on the lower surface of the fixed portion 17a of the reinforcing plate 17, a movable portion 18b that is fixed to the lower surface of the lid 15 by thermal caulking, the fixed portion 18a and the movable portion 18b. A plurality of hinge portions 18c to be connected. Each hinge portion 18 c is formed in a U-shaped cross section and extends toward the inside of the instrument panel 12. The bent portion 17b of the reinforcing plate 17 is fitted into the hinge portion 18c of the hinge plate 18, and the extended portions 17c of the reinforcing plate 17 pass between the adjacent hinge portions 18c of the hinge plate 18 and downward. It extends.

  A fixing portion 19a of a metal mounting bracket 19 is overlapped and fixed to the lower surface of the fixing portion 18a of each hinge plate 18. A plurality of L-shaped module support portions 19b... Extend downward from the fixing portion 19a of the mounting bracket 19.

  And the fixing | fixed part 17a of the reinforcement plate 17 superimposed on the lower surface of the instrument panel 12, the fixing | fixed part 18a of the hinge plate 18, and the fixing | fixed part 19a of the attachment bracket 19 are fastened together with the volt | bolt 20 ... and the nut 21 .... The

  The airbag module 23 is fixed to the retainer 24 with a container-shaped retainer 24 having an open upper surface, a cylindrical inflator 25 supported on the bottom of the retainer 24, and bolts 26 and nuts 27 in a folded state. The airbag 16 is provided. The upper end opening of the retainer 24 is fastened together with the extensions 17 c of the reinforcing plate 17 and the module support 19 b of the mounting bracket 19 with clips 28.

  Next, the structure of the airbag 16 will be described with reference to FIGS.

  As shown in FIGS. 4 and 5, the airbag 16 has a first side deployment surface 31 located on the inner side in the vehicle width direction, a second side deployment surface 32 located on the outside in the vehicle width direction, and an upper side. Connected to the upper development surface 33, the lower development surface 34 located on the lower side, the first and second side development surfaces 31, 32, the upper development surface 33, and the tips (rear ends) of the lower development surface 34. And an occupant restraint surface 35 facing the occupant's head.

  The front windshield 36 with which the front portion of the deployed airbag 16 abuts is inclined obliquely so that the inner part in the vehicle width direction is biased forward and the outer part in the vehicle width direction is biased rearward. The airbag 16 tries to deploy in a direction perpendicular to the front windshield 36 by a reaction force received from the front windshield 36. As a result, the axis C of the airbag 16 is inclined obliquely with respect to the longitudinal direction of the vehicle body, and the occupant restraint surface 35 is obliquely inclined with respect to the vehicle width direction. .

  Therefore, as shown in FIG. 5 (C), the airbag 16 in the fully deployed state is in the vehicle longitudinal direction of the first and second side deployment surfaces 31 and 32 on both sides in the vehicle width direction and facing each other. The lengths are different from each other. In other words, the first side development surface 31 on the inner side in the vehicle width direction (upper side in FIG. 5C) having a large distance to the front windshield 36 is set to have a large length L1 in the longitudinal direction of the vehicle body. The second side development surface 32 on the outer side in the vehicle width direction (the lower side in FIG. 5C) with a small distance to the vehicle is set to have a small length L2 in the vehicle longitudinal direction. Thereby, the axis C of the airbag 16 after completion of deployment can be made to coincide with the vehicle body longitudinal direction, and the direction of the passenger restraint surface 35 can be made to coincide with the vehicle width direction.

  On the first side portion deployment surface 31 of the airbag 16, two first flange portions 31 a and 31 a are formed in the vertical direction, which are superposed in the front-rear direction and fixed by the first sewing S 1 and S 1. Similarly, on the second side deployment surface 32 of the airbag 16, two second collar portions 32a and 32a are formed in the vertical direction, which are superposed in the front-rear direction and fixed by the second sewing S2 and S2. The The front-rear direction positions of the first flange portions 31a, 31a and the second flange portions 32a, 32a are aligned in the vehicle width direction. That is, the distance L3 between the front first flange portion 31a and the front windshield 36 is larger than the distance L4 between the front second flange portion 32a and the front windshield 36, and accordingly, the first and second flange portions on the front side. The airbag 16 is formed asymmetrically in front of 31a and 32a, and the airbag 16 is formed symmetrically in the rear.

  The overlapping amount W1 of the first flange portions 31a and 31a of the first side portion developing surface 31 is set equal to the overlapping amount W2 of the second flange portions 32a and 32a of the second side portion developing surface 32. Further, the breaking strength of the sewing S1, S2 of the first and second collar portions 31a, 32a located in the front is based on the breaking strength of the first sewing S1, S2 of the first, second collar portions 31a, 32a located in the rear. Is set too low. Accordingly, in the process of deploying the airbag 16, first, the second sewing S1 and S2 of the first and second collar portions 31a and 32a on the front side are broken, and the first and second collar portions 31a and 31a on the rear side are delayed after that. The sewing S1 and S2 of 32a is broken.

  Next, the operation of the embodiment having the above configuration will be described.

  When the vehicle collides and a deceleration of a predetermined value or more is detected, high pressure gas is generated in the inflator 25 of the airbag module 23, and the airbag 16 in a folded state is inflated with the gas. As shown in FIG. 3, when the airbag 16 is inflated inside the retainer 24, the pressure acts on the lower surfaces of the lids 15 and 15 of the instrument panel 12, and the fracture portion of the instrument panel 12 surrounding the lids 15 and 15. When the lid 12 is broken and the lids 15 and 15 are opened, the airbag 16 is deployed from the opening 14 formed in the instrument panel 12 into the vehicle interior.

  When the pair of front and rear lids 15 and 15 are opened, the hinge plates 18 and 18 provided on the lower surfaces of the lids 15 and 15 rotate upward with the hinge portions 18c as fulcrums, but the hinge portions 18c are formed in a U shape. Therefore, the lids 15 and 15 can be smoothly opened by being bent easily.

  As shown in FIG. 5 (A), when the airbag 16 is deployed in the vehicle interior, the front portion immediately comes into contact with the front windshield 36, and a reaction force F inclined from the front windshield 36 relative to the longitudinal direction of the vehicle body is generated. However, since the airbag 16 is asymmetrically formed in front of the first and second flange portions 31a and 32a on the front side, that is, from the first flange portion 31a of the first side deployment surface 31 to the front windshield 36. Is set to be larger than the distance L4 from the second flange portion 32a of the second side portion deployment surface 32 to the front windshield 36, the airbag axis when the asymmetric portion is deployed. C coincides with the longitudinal direction of the vehicle body.

  When the internal pressure of the airbag 16 is further increased by the gas supplied from the inflator 25, as shown in FIG. 5 (B), first, first and second sewing S1, S1 of the first and second collar portions 31a, 32a on the front side are firstly made. As S2 breaks and the occupant restraint surface 35 is aligned in the vehicle width direction, the rear stroke is performed. Further, as shown in FIG. 5C, the first and second first and second flange portions 31a and 32a are The second sewing S1, S2 is broken, and the airbag 16 is fully deployed by stroking backward while the occupant restraint surface 35 is aligned in the vehicle width direction. In this final deployment state, the length L1 of the first side development surface 31 having a large distance to the front windshield 36 in the longitudinal direction of the vehicle body is large and the distance to the front windshield 36 is small. Since the length L2 is set small, the axis C of the airbag 16 can be made to coincide with the longitudinal direction of the vehicle body, and the direction of the passenger restraint surface 35 can be made to coincide with the vehicle width direction.

  Normally, after the airbag 16 is in the fully deployed state shown in FIG. 5C, the occupant comes into contact with the occupant restraining surface 35. However, depending on the situation of the vehicle collision, the airbag 16 is in the fully deployed state. An occupant may come into contact with the occupant restraint surface 35 before.

  As shown in FIG. 6B, it is assumed that the distance L3 ′ from the first flange 31a of the first side deployment surface 31 to the front windshield 36 is from the second flange 32a of the second side deployment surface 32. If the distance L4 ′ to the front windshield 36 is set equal to the distance L4 ′, the first side development surface 31 is developed to the rear of the first flange 31a, but the second side development surface 32 is the second side development surface 32. The state which expand | deployed only to the front of the collar part 32a arises. In this state, when the occupant comes into contact with the occupant restraint surface 35 and the internal pressure of the airbag 16 increases, the second side portion deployment surface even if the sewing S1 of the first collar portion 31a of the first side portion deployment surface 31 is broken. There is a case where the sewing S2 of the second collar portion 32a of the 32 does not break, and there is a possibility that the first side development surface 31 extends more than the second side development surface 32 and the occupant restraint surface 35 is inclined.

  However, according to the present embodiment, as shown in FIG. 6A, the distance L3 from the first flange 31a of the first side development surface 31 to the front windshield 36 is equal to the second side development surface 32. Since the distance L4 from the second flange 32a to the front windshield 36 is set to be larger than the distance L4, the first side deployment surface 31 extends to the rear of the first flange 31a. The state where the partial development surface 32 is developed only to the front of the second flange 32a does not occur. Therefore, as shown in FIG. 6A, even if the occupant comes into contact with the occupant restraining surface 35 during the deployment of the airbag 16 to increase the internal pressure, the first flange portion 31a of the first side deployment surface 31 is increased. The first sewing S1 and the second sewing S2 of the second collar portion 32a of the second side development surface 32 are broken at the same timing, and the occupant restraint surface 35 can be prevented from being inclined.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  The first embodiment is based on the premise that the airbag 16 comes into contact with the front windshield 36 immediately after the airbag 16 starts to be deployed. However, in the second embodiment, the airbag module 23, the front windshield 36, The airbag 16 immediately before the first and second sewing S1, S1; S2, S2 of the first and second flange portions 31a, 31a; It is assumed that 16 contacts the front windshield 36.

  In this case, since the airbag 16 does not contact the front windshield 36 in the first half of deployment and does not receive a reaction force from the front windshield 36, the axis C of the airbag 16 is in the longitudinal direction of the vehicle body during the deployment. There is no inclination. And the airbag 16 is deployed to an intermediate state, the internal pressure rises, and immediately before the first and second sewing S1, S1; S2, S2 of the first and second collar portions 31a, 31a; 32a, 32a break, The airbag 16 comes into contact with the front windshield 36. As a result, the airbag 16 receives a reaction force from the front windshield 36 and the axis C is inclined with respect to the longitudinal direction of the vehicle body.

  Thus, in the second embodiment, the airbag 16 does not tilt in the first half of the deployment process, and the airbag 16 tilts in the second half. Therefore, it is necessary to prevent the airbag 16 from tilting in the second half. Therefore, in the present embodiment, the amount of polymerization W1 of the first flange portions 31a, 31a of the first side portion development surface 31 is greater than the amount of polymerization W2 of the second flange portions 32a, 32a of the second side portion development surface 32. Is also set larger.

  Therefore, the airbag 16 is deployed to an intermediate state and abuts against the front windshield 36, and receives the reaction force from the front windshield 36, and the timing when the axis C of the airbag 16 tilts with respect to the longitudinal direction of the vehicle body. The first collar portions 31a, 31a of the first side portion deployment surface 31 and the second collar portions 32a, 32a of the second side portion deployment surface 32 are unpolymerized, and the polymerization amount W1 of the first collar portions 31a, 31a is large. The airbag 16 prevents the occupant restraint surface 35 from being inclined by the first side deployment surface 31 extending more than the second side deployment surface 32 in which the polymerization amount W2 of the second flange portions 32a, 32a is small. However, it can be expanded to the final shape.

  Next, a third embodiment of the present invention will be described with reference to FIG.

  In the first and second embodiments, the extending direction of the first and second flange portions 31a and 31a; 32a and 32a is along the vertical direction. In the third embodiment, the first side portion is expanded. The first flange portions 31a, 31a of the surface 31 are disposed to be inclined from the front lower side to the rear upper side, and the second flange portions 32a, 32a of the second side portion development surface 32 are disposed to be inclined from the front upper side to the rear lower side. The

  Thus, by arranging the first and second collar portions 31a, 31a; 32a, 32a obliquely, the first and second sewing S1, S1; S2, S2 are broken from the front end toward the rear end. It can proceed smoothly. And since the inclination direction of 1st collar part 31a, 31a and 2nd collar part 32a, 32a is reverse, passenger | crew restraint surface 35 with the fracture | rupture of 1st, 2nd sewing S1, S1; S2, S2 Can be prevented from inclining with respect to the vehicle width direction.

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  In the first to third embodiments, the first and second flange portions 31a, 31a; 32a, 32a protrude toward the outside of the airbag 16, but in the fourth embodiment, the first, The second flange portions 31a, 31a; 32a, 32a protrude toward the inside of the airbag 16. Thus, when the 1st, 2nd collar part 31a, 31a; 32a, 32a is protruded toward the inside of the airbag 16, when 1st, 2nd sewing S1, S1; S2, S2 fractures | ruptures, The first and second flange portions 31a, 31a; 32a, 32a are not easily spread in the vehicle width direction, and the occupant restraint surface 35 can be reliably stroked in the front-rear direction.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the joint portion is constituted by the first and second sewing S1 and S2, but it can be constituted by bonding the base fabric or weaving the base fabric.

  In the embodiment, the first and second side development surfaces 31 and 32 are each formed with two hooks 31a and 31a; 32a and 32a, but the number of hooks is arbitrary.

  Further, in the embodiment, the first and second sewing parts S1, S1; S2, S2 of the first and second collar portions 31a, 31a; 32a, 32a are broken first from the front side, but they are broken at the same time. You may do it.

The perspective view of the compartment front part of the motor vehicle which concerns on 1st Embodiment 2-2 line enlarged sectional view of FIG. The figure corresponding to the said FIG. 2 which shows the state after completion of deployment of an airbag The perspective view which shows the shape in the middle of deployment of an airbag Explanatory drawing of the airbag deployment process (part 1) Explanatory drawing of the airbag deployment process (part 2) Explanatory drawing of the deployment process of the airbag which concerns on 2nd Embodiment Side view of the airbag according to the third embodiment Explanatory drawing of the deployment process of the airbag which concerns on 4th Embodiment

16 Airbag 25 Inflator 31 1st side part deployment surface 31a 1st collar part 32 2nd side part deployment surface 32a 2nd collar part 35 Passenger restraint surface 36 Front windshield S1 1st sewing (joining part)
S2 Second sewing (joint)
L1 Longitudinal length L2 of the first side developed surface L2 Longitudinal length L3 of the second side developed surface L3 Distance from the front windshield of the first collar L4 Distance W1 of the second collar from the front windshield Polymerization amount of 1 heel part W2 Polymerization amount of second heel part

Claims (6)

An air bag (16) that is deployed toward the rear of the vehicle body from a position along the front windshield (36) by gas generated by the inflator (25) abuts on an inner side in the vehicle width direction of the front windshield (36). A first side development surface (31) that extends rearward of the vehicle body, a second side development surface (32) that abuts against an outer portion of the front windshield (36) in the vehicle width direction and extends rearward of the vehicle body, In an airbag device comprising an occupant restraint surface (35) facing the occupant connected to the deployment direction tip of the first and second side portion deployment surfaces (31, 32),
The airbag device according to claim 1, wherein the first side portion deployment surface (31) is formed to have a longer front-rear direction length (L1, L2) than the second side portion deployment surface (32).   The first and second side surface development surfaces (31, 32) are joined in the front-rear direction and joined by breakable joint portions (S1, S2), respectively, first and second flange portions (31a, 32a). The airbag apparatus according to claim 1, wherein the first and second flange parts (31a, 32a) have the same polymerization amount (W1, W2).   The distance (L3) of the first flange (31a) from the front windshield (36) is larger than the distance (L4) of the second flange (32a) from the front windshield (36). The airbag device according to claim 2, wherein   The first and second side surface development surfaces (31, 32) are joined in the front-rear direction and joined by breakable joint portions (S1, S2), respectively, first and second flange portions (31a, 32a). 2. The air according to claim 1, wherein the polymerization amount (W1) of the first flange part (31a) is set larger than the polymerization amount (W2) of the second flange part (32a). Bag device.   The direction of the heel of said 1st, 2nd heel part (31a, 32a) was made to incline with respect to the deployment direction of said airbag (16), The any one of Claims 2-4 characterized by the above-mentioned. The airbag device according to item.   6. The bag according to any one of claims 2 to 5, wherein a bag of the first and second bag parts (31a, 32a) is protruded toward the inside of the airbag (16). Airbag device.

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