JP2006315549A - Mounting part structure of airbag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To endure the force generated during inflation of an airbag body and absorb a shock input when there is a shock input to an instrument panel. <P>SOLUTION: In the mounting part structure of the airbag device, an airbag module 3 is fixed to the vehicle body side member 1 extending to the approximately vehicle width direction through a mounting bracket 2. A fastening bracket 11 which is strong in the tension direction and weak in the compression direction is provided between the side part of the airbag module and the vehicle body side member 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an airbag device mounting portion structure.

  A vehicle such as an automobile is provided with an airbag device as an emergency safety measure. As one of such airbag apparatuses, an airbag apparatus for a passenger seat is known. The airbag device for the passenger seat is provided in a portion on the passenger seat side of the instrument panel. That is, a vehicle body side member that extends substantially in the vehicle width direction is disposed inside the instrument panel. An air bag module that accommodates the air bag body is attached to the vehicle body side member via a mounting bracket. Fixed. Moreover, an airbag door part is provided in the part which opposes the airbag module of the instrument panel back surface (for example, refer patent document 1).

The airbag body bulged from the airbag module presses the back surface of the instrument panel, tears the airbag door portion provided on the back surface of the instrument panel, and deploys it to the vehicle interior.
JP 2000-326814 A

  In the passenger seat airbag, the airbag module can withstand the force generated when the airbag body is inflated, and absorbs the impact input when an external impact input is applied to the instrument panel. In order to obtain, it is necessary to fix to a vehicle body side member using a mounting bracket. However, it is difficult to create a mounting bracket that satisfies these two requirements at the same time, and some measures may be required.

  In order to solve the above-described problem, in the invention described in claim 1, in the airbag apparatus mounting portion structure in which the airbag module is fixed to the vehicle body side member extending substantially in the vehicle width direction via the mounting bracket, The air bag device mounting portion structure is provided with a fastening bracket that is strong in the tensile direction and weak in the compression direction between the side portion of the bag module and the vehicle body side member.

  In the invention described in claim 2, the fastening bracket rotates the module side bracket piece fixed to the side portion of the airbag module, the member side bracket piece fixed to the vehicle body side member, and both the bracket pieces. The airbag device mounting portion structure according to claim 1, further comprising: a pivot shaft portion that is movably connected; and a stopper portion that restricts the pivot of the bracket pieces by the pivot shaft portion.

  According to the third aspect of the present invention, one of the module-side bracket piece and the member-side bracket piece is provided with a planned bending portion, and the planned bending portion is not bent by the rotation on the tension side, and is compressed. The air bag device mounting portion structure according to claim 2, wherein the air bag device mounting portion structure is configured to be bent for rotation.

  According to the first aspect of the present invention, a fastening bracket that is strong in the pulling direction and weak in the compression direction is provided between the side portion of the airbag module and the vehicle body side member, and is generated when the airbag body is inflated. It can withstand the force in the tensile direction and can absorb the impact input in the compression direction from the outside to the instrument panel.

  According to the invention of claim 2, the fastening bracket pivots the module side bracket piece fixed to the side portion of the airbag module, the member side bracket piece fixed to the vehicle body side member, and the both bracket pieces. By providing a pivot shaft portion that can be connected and a stopper portion that regulates the pivot of both bracket pieces by the pivot shaft portion, when there is an input, the module side bracket piece and the member side bracket piece Rotates around the rotation shaft portion, and the stopper portion appropriately restricts the rotation of both bracket pieces. At this time, the fastening bracket can be made strong in the tension direction and weak in the compression direction by setting the stopper portion.

  According to the third aspect of the present invention, the planned bending portion is provided in one of the module side bracket piece and the member side bracket piece, and the planned bending portion is not bent by the rotation on the tension side, By being configured to be bent, it can withstand the tensile force generated when the airbag body is inflated, and it is bent at the planned bending portion for external impact input to the instrument panel. This can be absorbed.

  The present invention is realized by means of providing a fastening bracket that is strong in the pulling direction and weak in the compression direction between the side portion of the airbag module and the vehicle body side member.

  Hereinafter, embodiments embodying the present invention will be described together with illustrated examples.

  1 to 5 show an embodiment of the present invention.

  First, the configuration will be described. An airbag device is provided as a safety means in an emergency for a vehicle such as an automobile. An airbag device for a passenger seat as one of such airbag devices is provided in a portion on the passenger seat side of the instrument panel. That is, a vehicle body side member 1 extending substantially in the vehicle width direction is disposed inside an instrument panel (not shown), and the airbag body is accommodated via the mounting bracket 2 with respect to the vehicle body side member 1. The airbag module 3 is fixed. And the airbag door part is provided in the part facing the airbag module 3 of an instrument panel. Here, a pair of mounting brackets 2 are provided, and are configured to support both side bottom surfaces of the airbag module 3 in a cantilever state. The base end of the mounting bracket 2 is fixed to a bracket fixed to the vehicle body side member 1 by welding using bolts.

  In this embodiment, a fastening bracket 11 is provided between the side portion of the airbag module 3 and the vehicle body side member 1 so as to be strong in the tensile direction and weak in the compression direction.

  More specifically, the fastening bracket 11 rotates the module side bracket piece 12 fixed to the side portion of the airbag module 3, the member side bracket piece 13 fixed to the vehicle body side member 1, and both the bracket pieces. The rotating shaft part 14 connected so that it may be possible and the stopper part 15 which controls rotation of both bracket pieces by the rotating shaft part 14 are provided.

  Here, although the fastening bracket 11 is provided on both sides of the airbag module 3, depending on circumstances, it may be provided on only one side. The module-side bracket piece 12 is attached to the back side of the instrument panel, for example, and is a mounting bracket for fixing to a guide bracket (not shown) that guides the airbag main body bulging from the airbag module 3. 16, the number of parts and the number of mounting steps can be reduced.

  The module-side bracket piece 12 has a bent shape extending substantially outward in the vehicle width direction after drooping substantially downward from the side surface of the airbag module 3. On the other hand, the member-side bracket piece 13 has a bent shape extending substantially inward in the vehicle width direction after rising substantially upward from a position outside the airbag module 3 in the vehicle body-side member 1. The outer bent portion 12a on the lower end side of the module-side bracket piece 12 and the inner bent portion 13a on the upper end of the member-side bracket piece 13 include a straight line extending substantially in the vehicle width direction, a tensile direction set by the fastening bracket 11, and Are directed to a plane including a straight line passing through the compression direction, are in surface contact with each other, and extend in the vehicle front-rear direction and are rotatably connected by a rotation shaft portion 14 substantially perpendicular to the plane. Moreover, the stopper part 15 bends the upper edge part in the outward bending part 12a of the module side bracket piece 12, and can be locked to the upper edge part in the inward bending part 13a of the member side bracket piece 13. Constitute.

  Further, a bent portion 18 is provided on one of the module-side bracket piece 12 and the member-side bracket piece 13, and the bent portion 18 is not bent when the tension side is rotated, but is rotated when the compression side. Is configured to be bent. More specifically, the planned bending portion 18 is a constricted portion in the vicinity of the base portion of the member-side bracket piece 13 such that the plate width is narrower than other portions. When the rotation on the tension side occurs, the stopper portion 15 is engaged with the inward bending portion 13a at the upper end of the member side bracket piece 13 and the moment arm M1 from the point 13b to the planned bending portion 18 is closer to the compression side. The moment arm M from the point 13c where the stopper portion 15 is locked to the inwardly bent portion 13a at the upper end of the member side bracket piece 13 to the bent portion 18 becomes longer by a required amount when the rotation occurs. Like that.

  Note that the tension direction and the compression direction in the fastening bracket 11 are made to substantially coincide with the force generated when the airbag body is inflated and the direction of the impact input from the outside to the instrument panel.

  Next, the operation of this embodiment will be described.

  The airbag body inflated from the airbag module 3 presses the back surface of the instrument panel, tears the airbag door portion provided on the back surface of the instrument panel, and deploys the vehicle interior. At this time, since the airbag module 3 is pulled by the airbag body, a force in the tension direction acts on the fastening bracket 11 via the airbag module 3.

  On the other hand, when there is an external impact input to the instrument panel, a force in the compression direction acts on the fastening bracket 11 via the airbag module 3.

  According to this embodiment, the fastening bracket 11 is provided between the side portion of the airbag module 3 and the vehicle body side member 1 so as to be strong in the tensile direction and weak in the compression direction. It can withstand the force in the pulling direction and absorbs the impact input in the compression direction from the outside to the instrument panel.

  More specifically, the fastening bracket 11 rotates the module side bracket piece 12 fixed to the side portion of the airbag module 3, the member side bracket piece 13 fixed to the vehicle body side member 1, and both the bracket pieces. The module-side bracket piece 12 and the member side when there is an input by providing a pivot shaft 14 that can be connected and a stopper 15 that restricts the pivot of the bracket pieces by the pivot shaft 14. The bracket piece 13 rotates about the rotation shaft portion 14 and the stopper portion 15 appropriately restricts the rotation of both bracket pieces. At this time, the fastening bracket 11 can be made strong in the tension direction and weak in the compression direction by setting the stopper portion 15.

  Then, one of the module-side bracket piece 12 and the member-side bracket piece 13 is provided with a planned bending portion 18, and the planned bending portion 18 is not bent for the rotation on the tension side, but for the rotation on the compression side. By being configured to be bent, it can withstand the tensile force generated when the airbag body is inflated, and it is bent at the planned bending portion 18 for external impact input to the instrument panel in the compression direction. This can be absorbed.

  That is, when a force in the tensile direction acts on the fastening bracket 11 due to the bulging of the airbag body, as shown in FIG. 4, the outward bent portion 12a on the lower end side of the module side bracket piece 12 and the member side bracket piece The pulling side rotation as indicated by the arrow occurs between the upper end 13 of the inner bent portion 13a, and the stopper portion 15 is locked to the point 13b on the inner bent portion 13a of the upper end of the member side bracket piece 13. Then, the moment arm M1 from this point 13b to the planned bending portion 18 is relatively short, and only the tensile force from the airbag body acts on the planned bending portion 18 and the bending direction is outward. Withstand this without bending.

  On the other hand, when a force in the compression direction is applied to the fastening bracket 11 by an external impact input, as shown in FIG. 5, the outer bent portion 12a on the lower end side of the module side bracket piece 12 and the member side bracket piece The rotation of the compression side as indicated by an arrow occurs between the upper end of the inner bent portion 13a and the stopper portion 15 is locked to the point 13c on the inner bent portion 13a of the upper end of the member side bracket piece 13. Is done. Then, the moment arm M from this point 13c to the planned bending portion 18 is relatively long, and the resultant force of the impact input from the outside and the load of the airbag module 3 acts on the planned bending portion 18 so that the bending direction is inside. Therefore, the planned bending portion 18 acts to bend inward and absorb this.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are only examples of the present invention, and the present invention is not limited to the configurations of the embodiments. Needless to say, design changes and the like within the scope of the present invention are included in the present invention.

1 is an overall perspective view of an embodiment of the present invention. It is a side view of FIG. It is the elements on larger scale of FIG. FIG. 4 is an operation diagram when a force in a tensile direction is applied in FIG. 3. FIG. 4 is an operation diagram when a force in the compression direction is applied in FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car body side member 2 Mounting bracket 3 Airbag module 11 Fastening bracket 12 Module side bracket piece 13 Member side bracket piece 14 Rotating shaft part 15 Stopper part 18 Bending plan part

Claims (3)

In the airbag device mounting portion structure in which the airbag module is fixed via a mounting bracket to the vehicle body side member extending substantially in the vehicle width direction,
A structure for attaching an airbag device, characterized in that a fastening bracket that is strong in a pulling direction and weak in a compression direction is provided between a side portion of an airbag module and a vehicle body side member.   The fastening bracket includes a module side bracket piece fixed to a side portion of the airbag module, a member side bracket piece fixed to the vehicle body side member, and a rotation shaft portion that rotatably connects the both bracket pieces. The airbag device mounting portion structure according to claim 1, further comprising a stopper portion that restricts rotation of the bracket pieces by the rotation shaft portion. One of the module side bracket piece and the member side bracket piece is provided with a planned bending portion, and the planned bending portion is not bent for the rotation on the tension side but bent for the rotation on the compression side. The airbag device mounting portion structure according to claim 2, wherein:

Images