JP2005088621A - Welded portion structure for vehicular air bag device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent the breakage of a welded rib at the time of unfolding of an air bag main body. <P>SOLUTION: The welding portion structure for a vehicular air bag device comprises an air bag lid divided by a brittle line on a resinous instrument panel, and a reinforcing door 8 disposed to abut on the back surface of the air bag lid. The air bag lid and the reinforcing door 8 are attached by letting the welded rib 15 projected out from the back surface of the air bag lid pass though a hole 16 formed on the reinforcing door 8 and welding that. A required clearance is formed between the hole 16 and the welded rib 15. Between the hole 16 and the welded rib 15, an interfering portion 35 with which both of the hole 16 and the welded rib 15 partially interfere is provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a welded portion structure of a vehicle airbag device.

  Some vehicles such as automobiles have an airbag device as a safety means in an emergency. In the airbag device, when an impact force of a predetermined value or more is applied to the vehicle body, the airbag body that is folded and housed in a housing disposed inside the instrument panel or the like has a pressure gas from the inflator. The supply swells to the passenger in the passenger compartment, receives the passenger seated at a predetermined position, and protects it from colliding with an instrument panel or the like.

  When the airbag body is inflated, the airbag grid is opened by pressing the airbag grid that is partitioned from the stationary / fixed portion by a weak line formed on the instrument panel or the like, and breaking the weak line. In addition, a bulge opening is formed, and the bulge opening is bulged from the bulge opening toward the passenger in the passenger compartment.

  In such an airbag device, in order to assist the opening of the airbag grid, a reinforcing door is provided on the back surface of the airbag grid.

The reinforcement door is attached to the airbag grid by, for example, passing a welding rib protruding from the back surface of the airbag grid through a hole formed in the reinforcement door and welding by heat caulking or the like (for example, patents). Reference 1). In addition, a required gap is formed between the hole formed in the reinforcing door and the welding rib to absorb manufacturing errors.
JP 2001-315605 A

  However, since a required gap is provided between the hole formed in the reinforcing door and the welding rib, there is a possibility that the load input when the airbag is deployed concentrates on the welding portion of the welding rib.

  In order to solve the above-mentioned problem, in the invention described in claim 1, an airbag grid partitioned by a weak line on a resin instrument panel, and a reinforcing door disposed in contact with the back surface of the airbag grid. The air bag grid and the reinforcing door are attached by passing a welding rib protruding from the back surface of the air grid through a hole formed in the reinforcing door, and between the hole and the welding rib, In a welded part structure of a vehicle airbag device in which a required gap is formed, a welded part structure of a vehicle airbag device in which an interference part that partially interferes between the hole and the weld rib is provided. It is characterized by.

  According to the first aspect of the present invention, the base portion and the hole of the welding rib which is not melted by the welding by providing the partial interference portion between the welding rib and the hole which are passed through with a necessary gap. Since the load is shared by the interfering portion between the two, the load input to the welded portion of the welded rib can be reduced correspondingly, and a practically beneficial effect can be exhibited.

  For the purpose of effectively preventing damage to the weld ribs when the airbag is deployed, both of them are partially formed between the holes formed in the reinforcing door and the weld ribs protruding from the back surface of the airbag grid. This is realized by means of providing an interference part that interferes with.

  Embodiments of the present invention will be described below together with illustrated examples.

  1 to 7 show an embodiment of the present invention.

  First, the configuration will be described. Some vehicles such as automobiles are provided with the airbag device 1 as an emergency safety means. The airbag apparatus 1 of this embodiment is provided in a portion of an instrument panel 2 on the passenger seat side that is located below a front window glass of an automobile. The instrument panel 2 is made of resin, and is a hard panel formed only of a core material. The instrument panel 2 is generally a full instrument panel having a size that reaches from the driver's seat to the passenger seat, but there is also a partial instrument panel that includes only the passenger seat portion. Hereinafter, the instrument panel 2 includes a partial instrument panel.

  A weak line 3 having a substantially U-shape or B-shape in plan view is formed on the instrument panel 2 made of resin, and the fixed / fixed portion 4 and the airbag grid 5 are partitioned by the weak line 3. . The airbag grid 5 is opened with respect to the stationary / fixed portion 4 by breaking the U-shaped or B-shaped weak line 3 when the airbag body 6 is deployed, thereby forming a bulging opening of the airbag body 6. Is. In addition, the weak line 3 is formed in the back surface side of the instrument panel 2, and it is comprised so that the airbag grid 5 may not be known from the surface side. In addition, when the weak line 3 is U-shaped or B-shaped, the air grid 5 is single-opened, but by making the weak line 3 substantially H-shaped in plan view, the air grid 5 is double-opened. You can also

  Then, the reinforcing member 7 is attached to the peripheral portion of the bulging opening formed by opening the air grid 5 on the back surface of the fixed / fixed portion 4 of the instrument panel 2. When the weak line 3 has a U-shape, the air grid 5 is opened with a U-shaped unconnected portion serving as a hinge to form a bulge opening. On the other hand, when the weak line 3 is formed in a square shape, the airbag grid 5 does not have a clear hinge, and is pulled out as it is to form a bulge opening.

  A reinforcing door 8 is attached to the back surface of the airbag grid 5. The reinforcing door 8 includes a door main body portion 9 positioned on the back surface of the airbag grid 5, a mounting portion 10 attached to a reinforcing member 7 provided around the airbag grid 5, a door main body portion 9 and the mounting portion 10. And a hinge portion 11 provided between the two. The reinforcing door 8 is configured separately from the reinforcing member 7. In addition, you may make it prevent the airbag grid 5 from sticking by overlapping at least one part of the peripheral part of the door main-body part 9 on the reinforcement member 7, and supporting the door main-body part 9 on the reinforcement member 7 ( FIG. 1 shows a state in which the edge on the side opposite to the hinge 11 is supported by the reinforcing member 7). The hinge part 11 is provided as a hinge when the air bag grid 5 is opened.

  Here, a plurality of pairs of parallel welding ribs 15 that are close to each other protrude from the back surface of the airbag grid 5 (see FIG. 3). The door body 9 is formed with a plurality of pairs of holes 16 (see FIG. 2) through which the welding ribs 15 are passed. Then, the reinforcing door 8 is attached to the rear surface of the airbag grid 5 by passing the welding rib 15 through the hole 16 and welding by heat caulking or the like (welding portion 15a). The welding rib 15 has a vertically long welding rib shape extending in the vehicle longitudinal direction 17 by a required length. Further, the hole 16 has a slit shape extending in the vehicle longitudinal direction 17 by a required length. A required gap 16a is formed between the hole 16 and the welding rib 15 in order to absorb manufacturing errors.

  Similarly, a plurality of pairs of welding ribs 18 protrude from the back surface of the fixed / fixed portion 4. The reinforcing member 7 is formed with a plurality of pairs of holes (not shown) through which the welding ribs 18 are passed. The reinforcing member 7 is attached to the back surface of the fixed / fixed portion 4 by passing the welding rib 18 through the hole and welding it by heat caulking or the like. The welding rib 18 has a vertically long welding rib shape that extends in the vehicle longitudinal direction 17 by a required length. The hole has a slit shape extending in the vehicle longitudinal direction 17 by a required length. A required gap 16a is formed between the hole and the welding rib 18 in order to absorb manufacturing errors.

  A frame-shaped leg portion 20 is formed around the weak line 3 of the reinforcing member 7. The mounting portion 10 of the reinforcing door 8 is fixed to the leg portion 20 by spot welding or the like. The attachment portion 10 is attached to the front portion of the leg portion 20 in the vehicle longitudinal direction 17.

  The door body 9 is provided with vertical beads 21 and horizontal beads 22, 23 as appropriate (see FIG. 2).

  The airbag device 1 further includes an airbag module 26 having a lid mounting hook 25 that can be inserted into and locked into a hook locking hole formed in the leg portion 20 of the reinforcing member 7. In this way, by attaching the airbag module 26 to the leg portion 20 of the reinforcing member 7 via the lid attachment hook 25, the reaction force when the airbag body 6 is deployed is prevented from acting directly on the instrument panel 2. I have to.

  The airbag module 26 includes an inflator accommodating portion 28 that can accommodate a cylindrical inflator 27 that ejects pressurized gas. The inflator accommodating portion 28 is fastened and fixed to a vehicle body side member (not shown) such as a steering support member using a fastening member 29 such as a bolt.

  Further, the airbag module 26 includes an airbag body storage unit 30 that stores the airbag body 6 inflated and deployed by the pressure gas ejected from the inflator 27 in a folded state.

  And in the thing of this Example, the interference part 35 which both interferes between the hole 16 and the welding rib 15 which were formed in the reinforcement door 8 is provided.

  Specifically, as shown in FIGS. 3 to 5, a partial convex portion 35 a that interferes with the base portion 15 b that is not melted by the welding of the welding rib 15 is provided on the substantially intermediate portion side in the longitudinal direction of the hole 16. You may make it provide.

  Alternatively, as shown in FIG. 7, a partial convex portion 35 b that interferes with the hole 16 may be provided on the side of the base portion 15 b that is not melted by the welding rib 15.

  Next, the operation of this embodiment will be described.

  When the inflator 27 is operated, the pressure gas is ejected from the inflator 27 and the pressure gas is introduced into the airbag body 6.

  The airbag main body 6 is inflated with the introduction of the pressure gas, and the U-shaped or B-shaped weak line 3 is broken by the pressure of the expansion, and the airbag grid 5 is opened with respect to the stationary / fixed portion 4. At the same time as the bulge opening is formed, the airbag body 6 bulges from the bulge opening toward the rear of the vehicle body (in the passenger compartment). As a result, the airbag body 6 receives the head of the passenger on the passenger seat side sitting at a fixed position, and protects the head from being in contact with the instrument panel 2 or the like.

  The reinforcing door 8 is attached to the back surface of the airbag grid 5 by welding the welding rib 15 protruding from the back surface of the airbag grid 5 through the hole 16 formed in the reinforcing door 8 (welding portion 15a). .

  According to this embodiment, by providing the partial interference portion 35 between the welding rib 15 and the hole 16 that are passed through with the required gap 16a, the welding rib 15 that has not been melted by welding is provided. Since the interference portion 35 between the base portion 15b and the hole 16 shares the load, the load input to the weld portion 15a of the weld rib 15 can be reduced accordingly.

  On the other hand, when the partial interference portion 35 is not provided, a large load is directly input to the welded portion 15a of the welded rib 15 as shown in FIG.

  Further, by making the interference part 35 partial, it is possible to make the interference part 35 function without being affected by manufacturing errors or the like.

  As described above, as shown in FIG. 3, a partial convex portion 35 a that interferes with the base portion 15 b that is not melted by the welding of the welding ribs 15 is provided on the side in the longitudinal direction of the hole 16. Can be achieved.

  Alternatively, as shown in FIG. 7, this can be achieved by providing a partial convex portion 35 b that interferes with the hole 16 on the side of the base portion 15 b that is not melted by the welding rib 15.

  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 a range not departing from the gist of the invention are included in the present invention.

It is side sectional drawing of the airbag apparatus concerning the Example of this invention. It is a top view of the reinforcing door of FIG. It is a perspective view of the welding rib of FIG. It is sectional drawing which shows the state before welding along the AA line of FIG. It is sectional drawing similar to FIG. 4 which shows the state after welding. It is sectional drawing similar to FIG. 5 when not providing an interference part. It is a perspective view similar to FIG. 3 which shows the other example of an interference part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Instrument panel 3 Weak line 5 Air bag grid 8 Reinforcement door 15 Welding rib 15a Welding part 15b Base part 16 Hole 16a Gap 35 Interference part

Claims (1)

An airbag grid partitioned by a weak line on the resin instrument panel, and a reinforcing door disposed in contact with the back surface of the airbag grid,
The airbag grid and the reinforcing door are attached by welding welding ribs protruding from the back surface of the airbag grid through holes formed in the reinforcing door, and between the holes and the welding rib, a required In the welded part structure of the vehicle airbag device in which a gap is formed,
A welded part structure for a vehicle airbag device, wherein an interference part is provided between the hole and the welded rib so as to partially interfere with each other.

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