JPH0721455U - Airbag device - Google Patents

Abstract

(57) [Summary] [Purpose] To firmly and easily fix the cover that covers the airbag. [Structure] An air bag 26 and an inflator 25 for injecting gas are fixed to a base plate 22. On this base plate 22, a pair of rectangular plate-shaped fixing portions 31 on both sides are formed.
An attachment portion 41 having substantially the same shape as the fixed portion 31 is integrally formed on a cover body 33 that covers the airbag 26. The mounting portion 41 and the fixed portion 31 are fastened and fixed to the bracket portion 17a formed on the boss plate 17 of the steering wheel body 11 by the bolts 44. [Effect] The cover body 33 can be firmly fixed to the base plate 22. The manufacturing cost can be reduced by reducing the number of rivets that fix the cover body 33 and the base plate 22.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an airbag device that is mounted on, for example, a steering wheel of an automobile to protect an occupant from an impact.

[0002]

[Prior art]

 Conventionally, for example, an airbag device described in Japanese Patent Laid-Open No. 3-164348 is known.

This airbag device has a base plate having a substantially rectangular shape in a plane, an inflator for injecting gas is fixed to the center of the base plate, and the inflator is covered on the upper side of the base plate. In this way, the bag-shaped air bag is folded and stored. In addition, the four peripheral edges of the base plate are bent downward to form side plates, and the cover bodies that cover the folded airbags are fixed to the side plates by a plurality of rivets. Has been done.

Further, mounting pieces extend downward from the side plate portions on both sides of the base plate, and these mounting pieces are fixed to a steering wheel body of an automobile by bolts or the like.

Then, in a state where the impact sensor detects an impact such as a collision of an automobile, gas is injected from the inflator into the inside of the airbag, the airbag is inflated rapidly, and the inflation pressure of the airbag causes the airbag to inflate. The cover body is cleaved at a predetermined position to form a projecting opening, and the airbag is projected to the occupant side through the projecting opening.

[0006]

[Problems to be solved by the device]

 However, in the above conventional configuration, in addition to the work of fixing the mounting piece of the base plate to the steering wheel body with bolts, etc., the work of fixing the cover body to the base plate with rivets etc. is required, and the work of assembling the airbag device In addition, there is a problem that the work of assembling the steering wheel body is complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an airbag device capable of easily and reliably fixing the cover body.

[0008]

[Means for Solving the Problems]

 The airbag device of the present invention is an airbag device including an inflatable airbag and a cover body for covering the airbag, and the cover body is fixed, and a fixing means is used for a mounted member. And a mounting portion formed on the cover body, the mounting portion being adjacent to the fixing portion of the mounting body and being fixed to the fixing portion by using the fixing means. is there.

[0009]

[Action]

 In the airbag device of the present invention, when the fixing portion of the mounting body is fixed to the member to be mounted using the fixing means, the mounting portion formed on the cover body is fixed to the fixed portion of the mounting body by the fixing means. It

[0010]

【Example】

 Hereinafter, a configuration of an embodiment of the airbag device of the present invention will be described with reference to the drawings.

In FIG. 6, reference numeral 11 denotes a steering wheel main body of an automobile. The steering wheel main body 11 has an annular rim portion 12, a boss portion 14 located at the center of the rim portion 12, and these rim portions 12. It has a plurality of spoke portions 15 that connect to the boss portion 14. Further, as shown in FIG. 1, the boss portion 14 of the steering wheel body 11 has a boss 16 fitted to a steering shaft (not shown), and a boss plate 17 as a mounted member fixed to the boss 16. Is provided, and the airbag device 21 is mounted on the upper side of the boss plate 17 on the passenger side.

As shown in FIGS. 1 and 2, the airbag device 21 has a base plate 22 as a mounting body formed by bending a metal plate or the like. The base plate 22 includes a substrate portion 23 having a substantially rectangular shape in a plan view, and a cylindrical side plate portion 24 formed by bending a peripheral portion of the substrate portion 23 downward.

A circular mounting hole 23a is formed in a substantially central portion of the substrate portion 23, and a substantially columnar inflator 25 is fitted into the mounting hole 23a. This inflator 25 is provided with a flange portion 25a at an intermediate portion in the height direction, the flange portion 25a is in contact with the lower surface of the base plate portion 23, and a gas injection port (not shown) is provided on the upper portion of the inflator 25. The high-pressure nitrogen gas is injected by burning the propellant that is formed and filled inside.

A bag-shaped airbag 26 is housed in a folded state on the upper side of the substrate portion 23 so as to cover the gas injection port of the inflator 25. The opening 26a of the air bag 26 is pressed by a retainer 27 having an annular shape, and the retainer 27 and the flange 25a of the inflator 25 are fastened together by a plurality of bolts 28 and rivets. The inflator 25 and the air bag 26 are fixed to the base plate 22.

Further, fixing portions 31 each having a substantially rectangular flat plate shape extend downward from substantially intermediate portions of the side plate portions 24 located on both sides. The fixing portions 31 are adapted to be fitted to the outer sides of the bracket portions 17a that are bent upward from both side portions of the boss plate 17. Further, each fixing portion 31 is formed with an elongated hole 31a whose longitudinal direction is the up-down direction, and communicates with a screw hole 17b provided in each bracket portion 17a.

On the other hand, the folded airbag 26 is covered with a cover body 33 made of synthetic resin. The cover body 33 includes an upper plate portion 34 facing the occupant, a cylindrical side wall portion 35 fitted to the outside of the side plate portion 24 of the base plate 22, and a front and rear continuous front end portion of the upper plate portion 34. The inclined wall portion 36 and the like are integrally formed, and have a substantially box shape with an open lower surface.

The lower surface side of the upper plate portion 34 is recessed in a substantially H shape in a plane, and a fragile tear line 37 is formed so as to be broken when the airbag 26 is inflated to form a projecting opening. It

The side wall portions 35 located at the front and rear are fixed to the side plate portion 24 of the base plate 22 by rivets 38 or the like at several places.

Further, attachment portions 41 each having a substantially rectangular flat plate shape are provided to extend from an intermediate portion of the side wall portions 35 located on both sides. The mounting portions 41 have substantially the same shape as the fixing portions 31 extending from the side plate portion 24 of the base plate 22, and cover the fixing portions 31 so as to contact the outside of the fixing portions 31. It is closely fitted. In addition, each mounting portion 41 is formed with a long hole 41a whose longitudinal direction is in the up-down direction so as to communicate with the long hole 31a of each fixing portion 31.

Then, the fixing portion 31 and the mounting portion 41 serve as a fixing means that is inserted into the washer 43 and the long holes 31a and 41a and is screwed into the screw hole 17b of the bracket portion 17a of the boss plate 17. The bolts 44 are integrally fastened together, and the cover body 33, the base plate 22, and the boss plate 17 are connected and fixed to each other.

Further, the airbag device 21 injects gas from the gas injection port of the inflator 25 to rapidly inflate the air bag 26 in a state where an impact sensor (not shown) detects an impact such as a collision of an automobile. . Then, due to the inflation pressure of the airbag 26, the cover body 33 is broken along the tear line 37 and the upper plate portion 34 is developed back and forth like a door to form a projection opening, from which the air is ejected. The bag 26 is projected toward the occupant to protect the occupant from impact.

Further, according to the airbag device 21 of the present embodiment, the mounting portion 41 formed integrally with the cover body 33 is fixed by the strong bolts 44 for fixing the base plate 22 and the bracket portion 17a of the boss plate 17 to each other. Since it is fixed to the fixing portion 31 of the base plate 22, the cover body 33 can be firmly fixed to the base plate 22.

Further, since the cover body 33 can be firmly fixed to the base plate 22 in this way, the number of bolts and rivets for connecting and fixing the cover body 33 and the base plate 22 can be reduced or omitted, The structure can be simplified and the manufacturing cost can be reduced.

In the above embodiment, the fixing portion 31 of the base plate 22 is formed in a rectangular flat plate shape, and the mounting portion 41 of the cover body 33 is fitted on the outer side of the fixing portion 31. As shown in FIG. 3, a fixed portion 51 having a substantially U-shaped cross section with a bent lower end may be formed, and a long hole 51a facing the fixed portion 51 may be formed.

Then, the mounting portion 41 of the cover body 33 is fitted inside the fixing portion 51, and the bolts 44 for inserting the long holes 41a and 51a are screwed into the screw holes 17b of the bracket portion 17a and tightened. Since the mounting portion 41 of the cover body 33 can be fixed while being clamped by the fixing portion 51, the mounting portion 41 can be fixed more firmly, and the seat surface of the bolt 44 does not directly contact the mounting portion 41, so the washer It is also possible to eliminate members such as 43. Furthermore, in this embodiment, the lower end portion of the mounting portion 41 abuts on the fixed portion 51, so that the positioning of the cover body 33 can be facilitated. Further, in the embodiment shown in FIG. 3, the inclined wall portions 53 for improving the appearance are integrally formed continuously with both side portions of the upper plate portion 34 of the cover body 33, and the steering wheel is A lower cover 54 that covers the lower side of the boss portion 14 is attached to the main body 11.

Further, in the embodiment shown in FIG. 4, the fixed portion 51 having a substantially U-shaped cross section is formed by bending the lower end portion. However, as shown in FIG. 5, the fixed portion 51 is continuously formed at the lower end portion of the side plate portion 24. The first fixing piece portion 61 is formed, and the second fixing piece portion 63 is formed on one side of the first fixing piece portion 61 via the connecting portion 62 having a small width dimension. It is also possible to form a fixing portion 65 that holds the attachment portion 41 of the cover body 33 between the first and second fixing piece portions 61 and 63 by bending.

Then, similarly to the embodiment shown in FIG. 3, the bolts 44 for inserting the long holes 61a and 63a formed in the respective fixing piece portions 61 and 63 and the long hole 41a of the mounting portion 41 into the screw holes of the bracket portion 17a. The mounting portion 41 of the cover body 33 can be sandwiched and firmly fixed by being screwed into the 17b. Also in this embodiment, the lower end portion of the second fixing piece portion 63 is bent toward the first fixing piece portion 61 to form the stopper portion 63b, so that the positioning at the time of attaching the cover body 33 can be performed. Can be easy. Further, in this embodiment, the second fixing piece portion 63 is formed by bending the portion along the lower side of the side plate portion 24 in the horizontal direction, so that the second fixing piece portion 63 is largely projected when the material is taken when the base plate 22 is formed. The part is gone and the yield is good.

In each of the above embodiments, the fixing portions 31, 51, 65 and the bracket portion 17a are formed integrally with the base plate 22 and the boss plate 17, respectively. Alternatively, it can be fixed by welding or the like.

Further, although the bolts 44 are used as the fixing means in each of the above-described embodiments, other fasteners such as rivets that can be tightened and fixed can be used.

[0030]

[Effect of device]

 According to the airbag device of the present invention, since the mounting portion formed on the cover body is fixed to the fixing portion of the mounting body by the fixing means, the cover body can be firmly fixed to the mounting body. Further, since the cover body can be firmly fixed to the mounting body, it is possible to reduce or omit a separate member for fixing the cover body and the mounting body.

[Brief description of drawings]

FIG. 1 is a sectional view of an airbag device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the above airbag device.

FIG. 3 is a sectional view of an airbag device according to another embodiment of the present invention.

FIG. 4 is a perspective view of a part of the above airbag device.

FIG. 5 is a perspective view of a part of an airbag device according to still another embodiment of the present invention.

FIG. 6 is a plan view of a steering wheel equipped with the airbag device of the present invention.

[Explanation of symbols]

 17 Boss plate as a member to be mounted 21 Air bag device 22 Base plate as a mounting body 26 Air bags 31, 51, 65 Fixing part 41 Mounting part 44 Bolts as fixing means

Claims (1)

[Scope of utility model registration request] 1. An airbag device comprising an inflatable airbag and a cover body for covering the airbag, wherein the cover body is fixed and is fixed to a member to be attached by using fixing means. An airbag device, comprising: an attachment body having a portion formed thereon, wherein the cover body is provided with an attachment portion that is adjacent to the fixing portion of the attachment body and is fixed to the fixing portion using the fixing means. ..