JP2008110737A - Airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an airbag device for a front passenger seat capable of sufficiently absorbing impact force and safely protecting a head part of an occupant even when an airbag main body is not inflated and the head of the occupant collides with an instrument panel etc. <P>SOLUTION: In this airbag device (10, 30), an air bag module (1) having the airbag main body (3) and an inflator (4) is mounted to a reinforcement (7) via a mounting tool (2). The mounting tool (2) is provided with a storage case (5) of the airbag module (1), a bracket (6, 36) supporting and fixing the air bag module (1) and the storage case (5) and having a leg part (6a, 36a), and a projecting member (8, 38) projecting from the bottom part of the storage case (5). The leg part (6a, 36a) of the bracket (6, 36) has an inclined part (6d, 36d). The projecting member (8, 38) is constituted so as to press the inclined part (6d, 36d) of the leg part (6a, 36a) to assist deformation of the bracket (6, 36) when the storage part (5) receives impact and deforms the bracket (6, 36). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an airbag device in which an airbag module having an airbag main body and an inflator is attached to a vehicle such as an automobile, and more particularly to an airbag for a passenger seat in which an airbag module is attached in an instrument panel in front of the passenger seat. The present invention relates to a bag device.

  Currently, as one of safety devices for protecting passengers when a vehicle such as an automobile collides, an airbag module having an inflator that generates gas and an airbag body that is inflated by the gas generated by the inflator is widely used. ing. In general, when a vehicle receives a large impact due to a collision, the airbag module detects the impact, generates high-pressure gas with an inflator, and introduces the airbag body into the airbag body instantly. Inflate and deploy. As a result, the occupant can be cushioned and supported by the airbag body, and the impact force applied to the human body can be greatly reduced.

  Such an air bag module for protecting an occupant is generally provided as a standard in a driver's seat of an automobile. Further, in recent years, an airbag module for a passenger seat, a curtain airbag module for dealing with a side collision, a knee airbag module for protecting a passenger's knee in a driver's seat, and the like have been installed in an automobile. It is coming.

  Various improvements and developments have been made on such various types of airbag modules in order to improve the quality, safety, and the like. For example, Japanese Patent Laying-Open No. 2005-96560 (Patent Document 1) discloses an invention relating to an airbag module for a passenger seat that can easily attach and detach an airbag module for a passenger seat to improve workability. ing.

  As shown in FIG. 7, the passenger seat airbag module 1 described in Patent Document 1 includes an airbag body 42, a housing case 43 for housing the folded airbag body 42, and an inflator (not shown). And a bracket 45 coupled to the inflator storage portion 44 and fastened and supported by a steering member (reinforcement) 57 with a bolt 58.

  In addition, a plurality of clamps 54 are formed at predetermined intervals on the upper and lower sides of the housing case 43, and a plurality of claws 51 are formed at predetermined intervals on a narrow strip plate-like hook 50. The member is held.

  On the other hand, on the lower surface (back surface) of the instrument panel 47 made of synthetic resin, a peripheral wall portion 55 is suspended so as to surround the airbag module 41. A plurality of through holes 49 are formed in the lower end portion of the peripheral wall portion 55 so as to face the plurality of claws 51 provided in the airbag module 41. A tear line 56 is formed on the back surface of the instrument panel 47 to urge the instrument panel 47 to be opened when the airbag body 42 is inflated and deployed.

  When the passenger seat airbag module 41 of Patent Document 1 is attached to the instrument panel 47, the airbag module 41 is lifted from the back side of the instrument panel 47 and inserted between the peripheral wall portions 55. Thereby, since the plurality of claws 51 provided in the airbag module 41 are locked in the plurality of through holes 49 formed in the lower end portion of the peripheral wall portion 55, the airbag module 41 is attached to the back surface of the instrument panel 47. Easy to install.

  Thereafter, the bracket 45 of the airbag module 41 is firmly fixed to the steering member 57 with the bolts 58, whereby the mounting state of the airbag module 41 can be stably maintained.

  When removing the airbag module 41 attached to the back surface of the instrument panel 47 as described above, the bolt 58 is removed to separate the bracket 45 and the steering member 57, and then the airbag module 41 is lifted from below. . As a result, the plurality of claws 51 and the hooks 50 that are locked in the through holes 49 of the peripheral wall portion 55 are detached from the clamps 54 of the airbag module 41, and the airbag module 41 is attached to the back surface of the instrument panel 47. Can be easily removed.

  On the other hand, for example, Japanese Patent Laid-Open No. 9-123863 (Patent Document 2) discloses an invention relating to a knee airbag module for protecting a leg portion of an occupant. As shown in FIG. 8, the knee airbag module 67 described in Patent Document 2 includes a passenger's left and right knees inside an under cover 62 that is integrally attached to a lower end of a vehicle instrument panel 61. It is arrange | positioned in the position which becomes the front of a part, respectively. The knee airbag module 67 is connected and fixed to the front deck cross member 70 by a bracket 76 having a pair of bent arms 75.

  Therefore, in the knee airbag module 67 of Patent Document 2, when the vehicle collides, the knee airbag body 72 of the left and right knee airbag modules 67 inflates and tears the lid 69 of the under cover 62, and FIG. It develops as shown by the two-dot chain line in (a). At this time, the knee airbag body 72 is deployed in the direction and shape as set in advance, so that the knee part of the occupant hits the deployed knee airbag body 72, thereby reducing the impact on the knee. it can.

In Patent Document 2, for example, in the knee airbag main body 72, when the impact on the occupant's knees cannot be sufficiently received, an impact force acts on the undercover 62 from the occupant's knees. 62 is pushed forward. As a result, the bent arm portions 75 of the left and right mounting brackets 76 are bent. Since the arm portion 75 is bent in this manner, a part of the impact energy can be absorbed by the bracket 76, so that a large impact force can be prevented from acting on the occupant's knee and the driver can be reliably protected. Can do.
JP 2005-96560 A JP-A-9-123863

  In the passenger seat air bag module, for example, when the vehicle receives an impact due to a collision, the impact force sensed by the air bag module is not so large as to activate the inflator (for example, when the vehicle is traveling at a low speed). In the case of a collision), the airbag body does not inflate, but as shown in FIG. 6, the body of the passenger 21 sitting in the passenger seat is pushed forward by the inertial force generated by the collision. As a result, the head 22 of the occupant 21 collides with the instrument panel 24 where the passenger seat airbag module 23 is attached.

  At this time, for example, when the housing case that houses the airbag module 23 is formed of a rigid body, the passenger 21 sitting in the passenger seat may receive a strong impact force on the head 22. It was. For this reason, for example, the conventional passenger seat airbag module 41 as described in Patent Document 1 has a plurality of holes 46 formed in the housing case 43 of the airbag module 41 as shown in FIG. It is configured so that, when the receiving case 43 receives a force from the upper side, the receiving case 43 is deformed such as buckling to absorb the force.

  As a result, even when the head of an occupant sitting in the passenger seat collides with the instrument panel without causing the airbag body to inflate as described above, part of the impact energy is caused by buckling of the storage case 43. Can be absorbed and the impact force received by the occupant's head can be reduced. However, when the occupant's head violently collides with the instrument panel without the airbag body inflating, the above-mentioned plurality of holes pierce the impact energy generated when the occupant's head collides. It is difficult to absorb completely only by the storage case provided. For this reason, in order to further improve the safety of passengers, it has been desired to develop an airbag module and an airbag device that can absorb impact energy more effectively.

  Therefore, in the passenger's seat airbag, in order to attach the airbag module so that greater impact energy can be absorbed when an occupant collides with the instrument panel, an airbag module storage case (or inflator storage section) For example, the bracket 76 used in the knee airbag module 67 described in Patent Document 2 may be used as a bracket that connects the reinforcement of the vehicle body.

  Since the bracket 76 used in the knee airbag module 67 of Patent Document 2 includes the pair of bent arm portions 75 as described above, when the impact force acts on the bracket 76, the bent arm portion 75 is provided. Further bending makes it possible to absorb part of the impact energy by the bracket 76. Therefore, by using such a bracket 76 and attaching the passenger seat airbag module to the reinforcement of the vehicle body, the impact energy when the occupant collides with the instrument panel is greatly absorbed, and the occupant's head is It is considered that the impact force received can be further relaxed.

  However, when the bracket 76 of Patent Document 2 is used for the passenger seat airbag module as described above, the following problems may occur. That is, for example, when the airbag module senses a large impact, the airbag body is inflated to open the instrument panel, and the airbag body is deployed between the occupant and the instrument panel. At this time, when the bracket 76 of Patent Document 2 is used for the passenger seat airbag module, a part of the force for tearing the instrument panel due to the expansion of the airbag body may be absorbed by the bracket 76.

  Therefore, although it is possible to solve the problem when opening the instrument panel by increasing the thickness by increasing the thickness of the bracket and improving the shock absorption of the instrument panel itself, When such measures are taken, there are problems such as an increase in the weight of the vehicle body and a complicated instrument panel structure, which complicates tuning.

  The present invention has been made in order to eliminate such a conventional problem, and a specific object of the present invention is to provide an impact even when an occupant's head collides with an instrument panel or the like without the airbag body inflating. It is possible to protect the occupant's head safely by absorbing enough force, and when the passenger airbag module detects a large impact, the efficient inflation and deployment of the airbag body is impaired. In addition, it is an object of the present invention to provide an airbag device for a passenger seat that is reduced in weight and inexpensive.

  In order to achieve the above object, an airbag device for a passenger seat provided by the present invention basically includes an airbag body and an inflator that generates a gas for inflating the airbag body. An air bag device in which an air bag module is attached to the reinforcement of a vehicle body via a fitting, wherein the fitting includes a housing case for housing the air bag module, the air bag module, and the housing case. A bracket having a pair of legs that are fixed to the reinforcement and a projecting member that protrudes from the bottom of the housing case, and the legs of the bracket have an interval between the legs. The projecting member has an inclined portion that inclines so as to gradually decrease or gradually increase toward the reinforcement side. Most preferably, when the bracket is deformed so as to be close to the reinforcement under impact, it is configured to assist the deformation of the bracket by pressing the inclined portion of the leg. It is a characteristic.

Further, in the airbag device according to the present invention, the inclined portion is formed such that an interval between the leg portions gradually decreases toward the reinforcement side, and the inflator is connected to the inflator from a bottom portion of the housing case. It is preferable that a part of the inflator that protrudes from the bottom of the housing case constitutes the protruding member, with a part protruding between the legs.
Furthermore, in this invention, it is preferable that the said inclination part has a bending part which changes the inclination-angle of the said leg part.

  In the passenger seat airbag device according to the present invention, the attachment for attaching the passenger seat airbag module to the reinforcement of the vehicle body includes a storage case, a bracket having a pair of legs, and a protrusion protruding from the storage case. And a member. Moreover, the leg part of the bracket has an inclined part, and the projecting member is configured to assist the deformation of the bracket by pressing the inclined part of the leg part when the bracket is deformed.

  Therefore, according to the airbag device of the present invention, for example, when the head of the occupant collides with the instrument panel or the like without the airbag body inflating at the time of a vehicle collision, The bracket is deformed so that the housing case approaches the vehicle reinforcement under impact by the bracket. At the same time, the protruding member protruding from the bottom of the housing case presses the inclined portion of the leg to assist the deformation of the bracket.

  As a result, the impact energy generated when the occupant collides can be sufficiently absorbed not only by buckling of the housing case as in the prior art but also by the deformation of the bracket and the deformation of the bracket. The impact force received by the vehicle can be reduced to effectively protect the occupant.

  In particular, in the present invention, even when the strength of the bracket is increased so that a part of the force for tearing the instrument panel due to inflation of the airbag body is not absorbed by the bracket, as described above, Since the protruding member protruding from the bottom can assist the deformation of the bracket, the impact energy can be reliably absorbed by the deformation of the bracket.

  Moreover, in the airbag apparatus which concerns on this invention, it forms so that the inclination part of a leg part may reduce gradually toward the reinforcement side. At the same time, the inflator is supported in a state in which a part of the inflator protrudes between the leg portions from the bottom of the housing case, and the protruding portion constitutes a protruding member that assists in the deformation of the bracket. Thus, the airbag device of the present invention that can absorb the impact energy when the occupant collides by the deformation of the bracket can be configured with a simple structure at low cost, and the thickness of the bracket is excessively increased. Therefore, the weight of the airbag device can be reduced.

  Further, the present invention has a bent portion that changes the inclination angle of the inclined portion of the leg portion. As a result, when the leg portion of the bracket is deformed, it is possible to more effectively assist the deformation of the bracket by the protruding member, and it is possible to secure a longer stroke capable of absorbing impact energy in the bracket. Become. Therefore, it is possible to more reliably absorb a larger impact energy at the time of a passenger collision.

  Hereinafter, an airbag device for a passenger seat according to the present invention will be described in detail with reference to the drawings by way of examples.

  FIG. 1 is a cross-sectional view showing a state when the airbag device of the present embodiment is attached to the back side of the instrument panel. FIG. 2 is a front view showing the airbag apparatus, and FIG. 3 is an exploded view showing components of the airbag apparatus.

  The airbag apparatus 10 in the present embodiment includes a passenger seat airbag module 1 and an attachment 2 for attaching the airbag module 1 to a reinforcement 7 of a vehicle body. The passenger seat airbag module 1 includes a folded airbag body 3 and an inflator 4 that generates gas for inflating the airbag body 3. Furthermore, the fixture 2 includes a housing case 5 that houses the airbag module 1, a first bracket 6 that supports the airbag module 1 and the housing case 5, and a protruding member 8 that projects from the bottom of the housing case 5. And a part of the inflator 4.

  Further, in the present embodiment, the passenger seat airbag module 1 and the fixture 2 are configured such that the respective constituent members are assembled together and integrally assembled, whereby the airbag as shown in FIG. The device 10 can be formed. Further, as will be described later, the airbag device 10 is assembled to the back side of the instrument panel 11 of the vehicle and is fixed to the reinforcement 7 of the vehicle body.

  As shown in FIG. 3, the airbag device 10 according to the present embodiment includes an airbag body 3, a housing case 5, and an inflator 4 between a retainer 9 having four legs 9 a and a first bracket 6. It is clamped and fixed and assembled together. Here, each component which comprises the airbag apparatus 10 is demonstrated in detail, referring FIG.

  The airbag body 3 is formed by wrapping a bag body folded in a predetermined procedure with a wrapping sheet that can be broken. An opening 3 a into which the inflator 4 can be inserted is provided on the lower surface portion of the airbag body 3, and a retainer 9 is attached from the inside of the airbag body 3 to a portion where the opening 3 a is formed. At this time, the retainer 9 is attached such that the leg portion 9 a of the retainer 9 protrudes downward from the lower surface of the airbag body 3.

  The housing case 5 is formed in a box shape having an upper surface opened. An opening 5a into which the upper half of the inflator 4 can be inserted is provided in the lower wall portion of the housing case 5, and the four legs of the retainer 9 can be inserted around the opening 5a. Four small holes are provided. Further, the housing case 5 of the present embodiment has a plurality of through holes 5b formed in the lower wall portion and the front and rear wall portions. Thereby, for example, when the storage case 5 receives a force from the upper side, the front and rear wall portions and the lower wall portion can be easily buckled. In the present embodiment, the lower wall portion, the front and rear wall portions, and the left and right wall portions of the housing case 5 are a wall portion that faces the lower side of the vehicle when the airbag module 1 is attached to the vehicle, and faces the front and rear sides. It refers to the wall and the wall facing the left and right sides.

  A hook member 12 is attached to the front and rear wall portions of the storage case 5 along the width direction of the storage case 5. The hook member 12 includes a flat plate portion 12a disposed in close contact with the front wall portion or the rear wall portion of the housing case 5, and a plurality of hooks disposed at predetermined intervals along the upper end edge of the flat plate portion 12a. It has the part 12b and the reinforcement part 12c distribute | arranged at right angle with respect to the flat plate part 12a along the lower end edge of the flat plate part 12a.

  The hook member 12 is integrally attached to the housing case 5 by fixing the left and right side edges of the flat plate portion 12a to the left and right wall portions of the housing case 5 by welding or the like. Furthermore, in order to stabilize the mounting state of the airbag module 1 to the vehicle body, second brackets 13 for connecting to the structural members of the vehicle body are fixed to the left and right wall portions of the housing case 5 by welding or the like. .

  The inflator 4 has a substantially spherical shape including an upper hemisphere portion 4a, a columnar portion 4b, and a lower hemisphere portion 4c. The inflator 4 is formed with flanges 4d having a substantially square shape when viewed from above at the lower part of the columnar part 4b, and small holes through which the four legs of the retainer 9 can be inserted at the four corners of the flange 4d. 4e is provided. Further, the inflator 4 is provided with a connector (not shown) that is connected to the control unit or the like.

  The first bracket 6 connects a pair of symmetrical leg portions 6a, four fixing portions 6b provided at one end of the left and right leg portions 6a, and the left and right leg portions at the other end side of the leg portion 6a. And a crotch portion 6c. The left and right leg portions 6a of the first bracket 6 include an inclined portion 6d formed so that the distance between the leg portions gradually decreases toward the crotch portion 6c, and a bent portion 6e that changes the inclination angle of the inclined portion 6d. Is formed.

  The four fixing portions 6b of the first bracket 6 are respectively provided with small holes 6f through which the four legs 9a of the retainer 9 can be inserted, and the crotch portion 6c is fixed to the reinforcement 7 of the vehicle body. A bolt hole 6g through which the bolt 15 is inserted is provided. Further, the first bracket 6 does not deform even when the first bracket 6 receives an impact force generated when the inflating airbag body 3 cleaves the instrument panel 11 when the airbag body 3 is inflated, for example. It is formed with such a predetermined strength.

  The airbag main body 3, the housing case 5, the inflator 4, and the first bracket 6 are integrally assembled using a retainer 9 having four legs 9a. The assembly procedure is as follows. First, the retainer 9 is attached inside the folded airbag body 3 so that each leg portion of the retainer 9 protrudes from the lower surface of the airbag body 3. The retainer 9 is preferably attached to the inside of the airbag body 3 when the airbag body 3 is produced by sewing or the like.

  Next, after the accommodation case 5, the inflator 4, and the first bracket 6 are attached in order to the four legs 9a of the retainer 9 attached to the inside of the airbag body 3, the four legs of the retainer 9 are attached. Attach nut 14 to 9a and tighten. As a result, the airbag device 10 in which the airbag module 1 and the fixture 2 as shown in FIG. 2 are assembled together can be obtained.

  At this time, the inflator 4 constituting the passenger seat airbag module 1 is fixed in a state in which the lower hemisphere portion 4c protrudes from the bottom of the storage case 5, and the inflator 4 protruding from the bottom of the storage case 5 The lower hemisphere portion 4c functions as the protruding member 8 in the airbag device 10 of the present embodiment.

  Next, a method for mounting the airbag device 10 of this embodiment on the back side of the instrument panel 11 will be described. In addition, as shown in FIG. 1, the square-wall-shaped surrounding wall part 11a is protrudingly provided in the back surface of the instrument panel 11 with which the airbag apparatus 10 is mounted | worn, and it accommodates in the lower part of this surrounding wall part 11a. A plurality of locking holes 11b capable of locking the hook portion 12b of the hook member 12 provided in the case 5 are formed. Further, on the back surface of the instrument panel 11, there is formed a tear line 11c made of a thin groove for facilitating the tearing of the instrument panel 11 when the airbag body 3 is inflated.

  First, the airbag device 10 of the present embodiment is inserted into the peripheral wall portion 11a on the back surface of the instrument panel 11 so as to be lifted. At this time, the housing case 5 is instrumented by hooking and locking the hook portions 12b of the hook members 12 provided in the housing case 5 into the plurality of locking holes 11b formed in the peripheral wall portion 11a of the instrument panel 11. It can be held at a predetermined position on the back surface of the ment panel 11.

  Subsequently, the positions of the first bracket 6 of the airbag device 10 and the fixing portion 7 a provided on the reinforcement 7 of the vehicle body are aligned and fastened by the bolt 15. Thereby, the airbag apparatus 10 of a present Example can be easily attached to the back surface of the instrument panel 11 by simple attachment work.

  Next, when the airbag apparatus 10 of the present embodiment is fixed to the instrument panel 11 and the vehicle body reinforcement 7 as described above, the airbag body 3 does not expand even if the vehicle collides. The impact energy absorption will be described with reference to FIG.

  For example, when the vehicle collides, if the impact force is smaller than a predetermined magnitude and the airbag body 3 does not inflate, the head 22 of the occupant 21 strongly collides with the instrument panel 11 (see FIG. 6). reference). At this time, only the instrument panel 11 cannot absorb the impact energy when the head 22 of the occupant 21 collides, and the occupant's head 22 is not the airbag as shown in FIG. Collides with the upper surface of the device 10.

  When the passenger's head 22 collides with the airbag device 10 in this way, the impact energy is transmitted to the housing case 5 via the airbag body 3. At this time, since the plurality of holes 5b are formed in the lower wall portion and the front and rear wall portions of the storage case 5, as shown in FIG. 4B, the front and rear wall portions of the storage case 5, and further the storage case The lower wall portion 5 starts to buckle, and a part of the impact energy can be absorbed by the housing case 5.

  Next, the impact energy that is not absorbed by the buckling of the housing case 5 is transmitted to the first bracket 6. At this time, since the leg portion 6a of the first bracket 6 in this embodiment has an inclined portion 6d, the leg portion 6a of the first bracket 6 is located between the leg portions 6a as shown in FIG. And the impact energy can be absorbed by the deformation of the leg portion 6a.

  Further, when the housing case 5 approaches the reinforcement 7 of the vehicle body due to the deformation of the leg portion 6a of the first bracket 6, as shown in FIG. 4D, the protruding member 8 (that is, the inflator 4) The lower hemisphere part 4c) hits the leg part 6a of the first bracket 6 and presses the inclined part 6d of the leg part 6a. Thereby, since the protrusion member 8 can assist the deformation | transformation of the leg part 6a, the absorption effect of the impact energy by a deformation | transformation of the leg part 6a can be heightened. Thereby, even if the 1st bracket 6 is formed with the predetermined intensity | strength as mentioned above, it can absorb impact energy reliably.

  As described above, in the airbag apparatus 10 according to the present embodiment, the impact energy when the occupant's head 22 collides is used for buckling of the housing case 5, deformation of the first bracket 6, and deformation of the first bracket 6. Since it can be sufficiently absorbed by the assistance, the impact force received by the occupant can be reduced to effectively protect the occupant and ensure the safety of the occupant.

  In particular, in this embodiment, a bent portion 6e is formed on the inclined portion 6d of the first bracket 6, and the inclined angle of the inclined portion 6d is changed with the bent portion 6e interposed therebetween. Thereby, in the airbag apparatus 10, the inclination part 6d of the leg part 6a by the side of the storage case 5 rather than the bending part 6e can be distribute | arranged to the position close | similar to the protrusion member 8 (lower hemisphere part 4c of the inflator 4). Accordingly, when the leg portion 6a of the first bracket 6 is deformed, the protruding member 8 immediately hits the inclined portion 6d of the leg portion 6a and presses the inclined portion 6d of the leg portion 6a. It is possible to more effectively assist partial deformation.

  Moreover, since the length of the inclined portion 6d on the reinforcement 7 side can be made longer than the bent portion 6e by changing the inclination angle of the inclined portion 6d across the bent portion 6e, the stroke capable of absorbing impact energy. Can be secured for a longer time. As a result, larger impact energy can be reliably absorbed by the legs 6 a of the first bracket 6.

  Note that the airbag device of the present invention is not limited to the above-described embodiment, and has various configurations as long as it has substantially the same configuration as that of the present invention and exhibits similar effects. Changes are possible.

  For example, in the said Example, the leg part 6a of the 1st bracket 6 has the inclination part 6d formed so that the space | interval between leg parts may reduce gradually toward the crotch part 6c. Further, the protruding member 8 that assists the deformation of the first bracket 6 is constituted by the lower hemispherical portion 4 c of the inflator 4. However, in the present invention, the airbag apparatus can be configured in the form as shown in FIG. In FIG. 5, members having the same configurations as those in the above-described embodiment are represented by using the same reference numerals, and description of the members will be omitted.

  That is, in the airbag device 30 shown in FIG. 5, the first bracket 36 of the fixture 32 connects a pair of left and right symmetrical leg portions 36a and the left and right leg portions 36a at one end side of the left and right leg portions 36a. Crotch portion 36b and two fixed end portions 36c provided at the other end of the leg portion 36b. The left and right leg portions 36a of the first bracket 36 include an inclined portion 36d formed so that the distance between the leg portions gradually increases toward the fixed end portion 36c, and a bent portion 36e that changes the inclination angle of the inclined portion 36d. And are formed. Further, the crotch portion 36b of the first bracket 36 is provided with a small hole (not shown) through which the four legs 9a of the retainer 9 can be inserted, and the two fixed end portions 36c are bolt holes through which bolts are inserted. 36 g is provided.

  Furthermore, in the airbag device 30 shown in FIG. 5, the projecting member 38 that assists the deformation of the first bracket 36 is constituted by two projecting portions 38a that project from the bottom of the housing case 5, and the inflator 4 is formed separately.

  Even when the airbag device 30 having such a configuration is attached to the back side of the instrument panel 11, as in the case of the above embodiment, when the head of an occupant collides with the instrument panel, the impact energy is It can be sufficiently absorbed by the buckling of the housing case 5, the deformation of the first bracket 36, and the assistance of the deformation of the first bracket 36. For this reason, the impact force received by the occupant during a collision can be reduced to ensure the occupant's safety.

  In the above description, the components of the fixtures 2 and 32 and the passenger seat airbag module 1 are assembled together by using the retainer 9, but the present invention is limited to this. It is not a thing. In the present invention, for example, it is also possible to configure an airbag device that can be attached to the back side of the instrument panel by separately assembling the fixture and the passenger seat airbag module and then further assembling them. .

  The present invention is effective as a fixture for attaching a passenger seat airbag module to a vehicle such as an automobile.

It is sectional drawing which showed the state when the airbag apparatus of this invention was attached to the back surface side of the instrument panel. It is the front view which showed the airbag apparatus typically. It is the exploded view which decomposed | disassembled and showed each structural member of the airbag apparatus. It is explanatory drawing explaining a mode that impact energy was absorbed with the airbag apparatus. It is the front view which showed typically the airbag apparatus which concerns on another form of this invention. It is explanatory drawing explaining a mode that a passenger | crew's head collides with an instrument panel in response to an inertial force. It is sectional drawing which showed typically the state which attached the conventional airbag module for passenger seats to the back surface side of the instrument panel. (A) is sectional drawing which showed typically the attachment state of the conventional knee airbag module, (b) is the perspective view which expanded and showed the principal part of knee airbag module typically. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Passenger seat airbag module 2 Attachment 3 Airbag main body 3a Opening part 4 Inflator 4a Upper hemisphere part 4b Columnar part 4c Lower hemisphere part 4d Flange 4e Small hole 5 Housing | casing case 5a Opening part 5b Through-hole 6 1st bracket 6a Leg Part 6b Fixed part 6c Crotch part 6d Inclined part 6e Bent part 6f Small hole 6g Bolt hole 7 Reinforcement 7a Fixed part 8 Protruding member 9 Retainer 9a Leg part 10 Air bag device 11 Instrument panel 11a Peripheral wall part 11b Locking hole 11c DESCRIPTION OF SYMBOLS 12 Hook member 12a Flat plate part 12b Hook part 12c Reinforcement part 13 2nd bracket 14 Nut 15 Bolt 21 Crew 22 Head 23 Airbag module 24 Instrument panel 30 Airbag apparatus 32 Attachment tool 36 1st bracket 36a Leg part 3 b crotch portion 36c fixed end 36d inclined portion 36e bent portion 36g bolt hole 38 protrusion member 38a projecting portions

Claims (3)

An airbag module (1) for a passenger seat having an airbag main body (3) and an inflator (4) that generates gas for inflating the airbag main body (3) is connected to the vehicle body via a fitting (2). Airbag device (10, 30) to be attached to the reinforcement (7) of
The attachment (2) includes a housing case (5) for housing the airbag module (1), and supports the airbag module (1) and the housing case (5) to the reinforcement (7). A bracket (6, 36) having a pair of legs (6a, 36a) to be fixed, and a protruding member (8, 38) protruding from the bottom of the housing case (5),
The leg portions (6a, 36a) of the bracket (6, 36) are inclined portions that are inclined so that the interval between the leg portions (6a, 36a) gradually decreases or gradually increases toward the reinforcement (7) side. (6d, 36d)
The projecting member (8, 38), when deforming the bracket (6, 36) so that the housing case (5) receives an impact and approaches the reinforcement (7), the leg (6a, 36a) is configured to assist the deformation of the bracket (6, 36) by pressing the inclined portion (6d, 36d).
An airbag device characterized by that. The inclined portion (6d) is formed such that the interval between the leg portions (6a) gradually decreases toward the reinforcement (7) side,
The inflator (4) is supported by the bracket (6) in a state in which a part of the inflator (4) protrudes between the legs (6a) from the bottom of the housing case (5),
A portion (4c) protruding from the bottom of the housing case of the inflator (4) constitutes the protruding member (8).
The airbag device according to claim 1.   The airbag device according to claim 1 or 2, wherein the inclined portion (6d, 36d) includes a bent portion (6e, 36e) that changes an inclination angle of the leg portion (6a, 36a).

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