JPH04110251A - Air bag device - Google Patents

Abstract

PURPOSE:To secure the economic efficiency and safety by increasing the breakage strength of the third broken part that of the first and second broken parts, in an air bag device equipped with a gas generator, air bag body, and a cover member for covering the air bag body, in order to protect a driver in the collision of a vehicle, etc. CONSTITUTION:The operation of a gas generator 4 fixed on a base plate 1 by a fixing means 8 such as bolts and nuts ruptures only the first broken part 21 and the second broken part 23 each of which has a small breakage strength, and a cover member 15 is developed. After an air bag body 3 is buldged out left and right, leaving a strip-shaped part 27, the third breakage part 25 having a large breakage strength is broken, and the strip-shaped part 27 is developed in the longitudinal direction, and the air bag 3 is bulged out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an airbag device that protects occupants in the event of a collision of a vehicle, etc. More specifically, the present invention relates to an airbag device that protects occupants in the event of a collision of a vehicle, etc. More specifically, it includes a gas generator fixed to a base plate, an airbag main body having a gas inlet into which gas from the gas generator flows and fixed to the base plate; and an airbag main body that covers the airbag main body in a stored state and has an outer peripheral edge fixed to an end of the base plate. The present invention relates to an airbag device including a rectangular parallelepiped-shaped cover member.

[Prior Art] Airbag devices have been known as protection devices for occupants of vehicles and the like. As this protective device,
-43890 publication, Utility Model Application Publication No. 1856.42/1986, etc. exist.

As shown in FIG. 4, a gas generator 2 is fixed to a base plate 1 attached to a fixed side of an instrument panel, a steering wheel, etc., and an airbag body 3 having a gas inlet 4 is connected via a retainer 5 to a rivet 6 or It is fixed with bolts or the like, and when the gas generator 2 is activated under predetermined conditions, gas instantaneously flows into the airbag body 3, and the airbag body 3 instantaneously inflates. There is.

In the folded state, the airbag body 3 is covered with a cover member 7 made of synthetic resin, and its position is regulated.
This is done so that they do not come into contact with each other.

The cover member 7 is formed into a substantially rectangular parallelepiped shape, and the outer peripheral edge 7a is recessed 8 at the end 1a of the base plate 1.
Or it is fixed with bolts etc. When the airbag main body 3 is inflated, the thin portion 7b formed on the upper surface of the cover member 7 is broken, and the airbag main body 3 is inflated forward.

(Problem to be solved by the invention) However, in the conventional airbag device, the main stream of gas from the gas generator 2 collides with the front side of the airbag body 3, causing the airbag body 3 to expand in one direction toward the passenger. There was a risk of impact on the occupant's face, etc.Therefore, it is widely used to control the expansion of the final shape of the airbag body using a hanging heald, but it is not enough to control the expansion during the deployment process. It had not been done.

An object of the present invention is to provide an airbag device that is extremely economical and has excellent safety by effectively preventing the airbag body from expanding in one direction toward the occupant when a gas generator is activated.

[Means to solve the problem]

The present invention has been made in view of the above-mentioned problems, and includes a gas generator fixed to a base plate, an airbag body fixed to the base plate having a gas inlet into which gas from the gas generator flows. , an airbag device comprising: a substantially rectangular parallelepiped-shaped cover member that covers the airbag main body in a stored state and has an outer peripheral edge fixed to an end of the base plate; A band-shaped portion is formed by the first to-be-broken portion extending to , and a U-shaped or U-shaped to-be-broken portion is formed continuous with the first to-be-broken portion on both left and right sides sandwiching the band-like portion. A second to-be-broken part is formed, and a third to-be-broken part is formed in a state that crosses the band-like part, and the third to-be-broken part has a breaking strength higher than that of the first and second to-be-broken parts. It is characterized by its large size.

[Effect]

According to the present invention, the first to-be-broken portion forming the central band-like portion of the upper surface portion of the cover member and the second to-be-broken portion formed on both left and right sides of the band-like portion are connected to the band-like portion. Since the breaking strength is lower than that of the third broken part which is formed in a state where it crosses the The cover member expands with the center band remaining, causing the airbag body to bulge out to the left and right, and then the third band, which has a higher breaking strength, is expanded.
The band-shaped part can expand forward and backward due to the torn part of the airbag, allowing the airbag body to bulge out to its original shape, and there is no risk of it bulging out in one direction toward the occupant and causing a shock to the occupant's face, etc. It is.

[Example] Hereinafter, an airbag device according to the present invention will be described in detail with reference to the drawings.

1A to C and 2A to C schematically show an embodiment of an airbag device according to the present invention, and the parts corresponding to FIG. 4 shown as the prior art are the same. A detailed explanation will be omitted by adding a reference numeral.

The fixed side of the airbag device 11 to which the base plate 1 is attached can be the instrument panel side or the steering side.

As shown in FIG. 4, the airbag device 11 has a gas generator 2 fixed to the base plate 1 by fixing means 8 such as bolts and nuts, and a gas inlet 4 through which gas from the gas generator 2 flows. The airbag body 3 is also provided.

The airbag main body 3 is attached to the cover member 15 in the folded state.
covered with. The cover member 15 is fixed to the end portion 1a of the base plate 1 with a plurality of rivets 8 or the like,
It is formed into a substantially rectangular box-like shape, consisting of an upper surface portion 16 and a side wall portion 17, which have a substantially rectangular shape and have a flat front when installed, and whose lower end, which is the back side when installed, is open.

A pair of first to-be-broken portions 21 extending in parallel in the front-rear direction are formed approximately at the center of the upper surface portion 16 of the cover member 15 . Like the second and third torn parts 23 and 25 described later, the first torn part 21 is formed by providing a perforation slit, a thin wall part, etc. at a predetermined position, and is formed by providing the above-mentioned gas generation The cover member 15 can be easily broken along this slit etc. when the device 2 is operated.

A band-shaped portion 27 is formed at the center of the upper surface portion 16 of the cover member 15 sandwiched between the pair of first to-be-broken portions 21 , 21 . The width of this band-shaped portion 27 is not particularly limited, but the band-shaped portion 27 should be one that restricts the expansion of the airbag body 30 in one direction toward the occupant, as shown in FIGS. 1B and 2, respectively. Therefore, it is preferable to form it in a size of about 1.5% of the long side of the upper surface portion 16. A second torn part 23 forming a U-shaped or U-shaped torn part continuous with the first torn part 2 is formed on the left and right sides of the band-shaped part 27, respectively. has been done. In this embodiment, the second to-be-broken portion 23
The to-be-broken portion is formed in a U-shape with the first to-be-broken portion 21 as the vertical side, and the side wall portion 1 of the cover member 15 is
A second to-be-broken portion 23 is also formed at the corner portion of 7. With such a configuration, as shown in FIGS. 1B and 1C, the side wall portion 17 as well as the upper surface portion 16 of the cover member 15 is also damaged along the first and second to-be-ruptured portions 21.23 when the gas generator 2 is operated. It can be broken and expanded to easily inflate the airbag body 3.

A third to-be-broken portion 25 is formed in the band-like portion 27 in a state that crosses the band-like portion 27, and although it is formed approximately in the center in this embodiment, it is not limited thereto. The third broken part 25 is the first and second broken part 21.23.
It is designed to have greater breaking strength. For example, if each of the to-be-broken parts is formed with perforation slits, the perforation pitch of the third to-be-broken part 25 is the same as that of the first and second to-be-broken parts 2.
123, and when the to-be-broken part is formed with a thin part, the thickness of the third to-be-broken part 25 may be made thicker than the first and second to-be-broken parts 21 and 23. It is.

With this configuration, as shown in FIGS. 1B and 2B, when the gas generator 2 is operated, only the first and second to-be-ruptured parts 21 and 23, which have a low breaking strength, are broken and the cover member 1 is broken.
5 is expanded to inflate the airbag body 3 to the left and right with the band 2 left behind.Then, the third torn part 25, which has a high breaking strength, is broken and the band 27 is expanded back and forth, thereby expanding the airbag body 3. 3 can be expanded to its original shape.

Different embodiments of the present invention are shown in FIGS. 3A and 3B, and have the same structure as the above-described embodiment except that the shape of the portion to be broken is different. To explain this simply, the third
Figure A shows a case where the second torn part 23 is formed in a U-shape with the first torn part 21 as one side, and Figure 3B shows the left and right parts. A case is shown in which the second to-be-broken portions 23 are formed so that the to-be-broken portions have a 0-shape and an inverted U-shape, respectively. In these configurations as well, the airbag body 3 can be inflated without giving an impact to the occupant, as in the above-mentioned embodiments.
It is of course also possible to use the cover member 15 shown in FIG.

〔Effect of the invention〕

The above is the configuration of an embodiment of the airbag device according to the present invention. The second torn portions formed on the left and right sides of the strip have a lower breaking strength than the third torn portions formed across the strip, so that the gas generator is activated. In this case, the cover member is first expanded by the first and second torn parts, which have a low breaking strength, leaving a band-shaped part in the center of the upper surface part, and the airbag body expands to the left and right, and then the first and second torn parts, which have a high breaking strength, expand to the left and right. The third torn part allows the band-shaped part to expand forward and backward, allowing the airbag body to bulge out to its original shape, preventing it from bulging out in one direction toward the occupant and causing a shock to the occupant's face. Therefore, it is possible to obtain an airbag device that is extremely safe.

[Brief explanation of the drawing]

1A to C and 2A to C respectively show an embodiment of the airbag device according to the present invention, and FIGS. 1A to C are schematic perspective views showing the expanded state of the cover member, respectively; Second
3A and 3B are perspective views of a cover member showing different embodiments of the present invention, and FIG. 4 is a sectional view showing a conventional airbag device. In the figure, ■...Base plate, 2...Gas generator,
3... Airbag body, 11... Airbag device,
15...Cover member, 16...Top surface part, 21...
First broken part, 23... Second broken part, 25...
- Third broken part, 27... band-shaped part. (A) CB) (A) Figure A (C) (B) Figure

Claims (1)

[Claims] (1) A gas generator fixed to a base plate, an airbag body having a gas inlet into which gas from the gas generator flows, and an airbag body fixed to the base plate, and covering the airbag body in a stored state. In an airbag device comprising a substantially rectangular parallelepiped-shaped cover member whose outer peripheral edge is fixed to an end of the base plate, a band-shaped portion is formed at the center of the upper surface of the cover member by a pair of first to-be-ruptured portions extending in the front-rear direction. is formed, and a second torn part is formed on both left and right sides sandwiching the band-shaped part, and is continuous with the first torn part and forms a U-shaped or U-shaped torn part; A third torn part is formed across the band-shaped part, and the third torn part is formed to have greater breaking strength than the first and second torn parts. bag equipment.