JPH0650268Y2 - Air bag device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an airbag device, and more particularly to an airbag device having an improved module cover having a cover side surface.

[Prior Art] Conventionally, various technologies have been proposed for airbag devices. For example, in the technique shown in FIG. 6, the module cover K is composed of cover top surfaces 61a, 61b and a cover side surface 62 that can be ruptured and expanded, and the module cover K is a cover side surface.
Inside the 62, the retainer 63 fixed to the vehicle body and the mounting leg 64 to be attached are integrally provided, and the cover upper surfaces 61a and 61b are torn along a breaking line (not shown) to form a hinge. It is supposed to open. That is, the sensor detects the collision of the vehicle,
When the gas generator G is actuated, the airbag B inflates, but the pressure at this time causes the upper surfaces 61a and 61b of the cover to be broken from the breaking portion and open in a hinge shape, so that the airbag B bulges outward. It has become. In FIG. 6, reference numeral 65 is a boss, reference numeral
66 is a body cover.

[Problems to be Solved by the Invention] In the above airbag device, when the cover upper surfaces 61a and 61b are deployed like a hinge, the elasticity of the module cover K causes the cover to always return (that is, the arrow in FIG. 6). As shown in
A force is applied in the direction that tightens the airbag B inside),
It was supposed to hinder the free deployment of the airbag B.
Further, since the force is always applied to the inside when the airbag B is deployed, the airbag B rubs against the inner wall surface 67 of the module cover K, which is not preferable for both the airbag B and the module cover K. In particular, the cover side surface 62 is interlocked with the cover upper surfaces 61a and 61b to limit the movement of the cover upper surfaces 61a and 61b to limit the airbag deployment characteristic, or the cover side surface 62 abuts the mounting leg 64 and the cover upper surface 61a. There was the inconvenience of limiting the movement of the 61b.

The purpose of the present invention is to provide a module cover on the side of the cover,
Provided is an airbag device integrally having mounting legs attached to a retainer inside a side surface of the cover, wherein the module cover does not hinder the deployment of the airbag when the airbag is activated. Especially.

[Means for Solving the Problems] In an airbag device according to the present invention, a retainer is fixed to a vehicle body side in front of an occupant, a gas generator is attached to a substantially center of the retainer, and an attachment surface around the gas generator is attached. An airbag, which is fixed to the attachment end of the airbag and is folded so as to surround the gas injection hole of the gas generator, is covered by a breakable and expandable module cover in which a cover upper surface and a cover side surface are integrated. , The module cover has a cover side surface,
In an airbag device integrally having a mounting leg which is concealed by the cover side surface and is attached to the retainer inside the cover side surface, in the cover upper surface between the mounting leg and the cover side surface, the mounting leg is provided. It is characterized in that a thin-walled portion along which a portion that easily expands and bends is formed.

Further, as shown in claim 2, the module cover extends between the connecting portion between the mounting leg and the module cover, near the base of the mounting leg with the cover, along the connecting portion, and in the lateral direction of the cover. It is characterized in that a rounded portion is formed so as to easily expand and bend.

[Operation] As described above, when a thin-walled portion that is easily expanded and bent along the mounting leg is formed on the cover upper surface between the mounting leg and the cover side surface, the cover upper surface and the cover side surface are formed by this portion. The movement of the cover can be divided, and the side surface of the cover can be prevented from interlocking when the upper surface of the cover is opened by the bulging of the airbag. For this reason, the opening degree of the module cover can be increased, and the airbag deployment characteristics are not hindered, and the airbag and the back surface of the opened module cover can be prevented from rubbing when the airbag is deployed. It is possible to prevent damage to both module covers. Moreover, since the cover upper surface and the cover side surface are integrated, the design is also good.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.

1A to 1D show a first embodiment of the present invention, in which an airbag device S of the present embodiment is a steering wheel 10
The boss plate 11 on the vehicle body side in front of the occupant is provided with a retainer 12 having a hole formed substantially in the center,
It is supported by a support plate (not shown), the gas generator G is attached to the hole 12a at the substantially center of the retainer 12, and the flange 13 of the gas generator G, the retainer 12, the bag ring, and the fastener (all not shown). Attach the airbag B folded so as to surround the gas injection hole (not shown) via
Further, a module cover K is attached on the retainer 12 so as to cover the airbag B.

The module cover K of this example is made of synthetic resin and has a rectangular shape as shown in FIGS. 1A and 1B, and horn buttons H are arranged at four corners. In the module cover K, the cover upper surfaces 1a and 1b and the cover side surface 2 are integrally formed, and the cover upper surfaces 1a and 1b are rupturable and expandable with respect to each other. That is, the cover top surfaces 1a, 1b are formed with a break line 3 in an H-shape in a top view, and when the airbag B is inflated, the cover top surfaces 1a, 1b are broken by the break lines 3 as shown in FIG. 1D. Is opened like a hinge.

The module cover K has a mounting leg 4 that is concealed by the cover side surface 2 and is attached to the retainer 12 at a position inside the cover side surface 2 and that is integrally formed toward the vehicle body. The mounting legs 4 of this example are the cover upper surfaces 1a, 1
It is formed at a position, which is slightly closer to the center than the boundary between b and the cover side surface 2, along the cover side surface 2 so as to match the width of the retainer 12.

Then, between the mounting leg 4 and the side surface 2 of the cover, the upper surface of the cover
A thin notch 5 is formed in the cover 1a, 1b as a portion where the cover upper surfaces 1a, 1b are easily expanded and bent. The position of the notch 5 in this example is as shown in FIG. 1C.
It is formed at the contact portion between a and 1b and the side surface 2 of the cover. The first
Reference numeral 15 in FIGS. 1B and 1D is a boss portion, and reference numeral 16 is a body cover.

According to the airbag device having the above configuration, the upper surface of the cover
It is possible to divide the movement between 1a, 1b and the side surface 2 of the cover,
When the cover upper surfaces 1a and 1b are opened by the bulging of the airbag B, the cover side surface 2 can be prevented from interlocking. In addition, the opening degree of the module cover K can be increased, and the deployment characteristics of the airbag B are not disturbed. Further, since the opening degree becomes larger, the airbag B and the upper surface of the cover 1a, 1 opened when the airbag B is deployed
It is possible to prevent the back surface of b from rubbing and prevent damage to both the airbag B and the module cover K. Even when the cover side surface 2 moves and collides with the mounting leg 4, the movement of the cover upper surfaces 1a and 1b can be restricted because the cover side surface 2 is bent by the notch 5. Absent.

2 to 5 show second to fifth embodiments, and in these embodiments, the same parts as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the embodiment shown in FIGS. 2 and 3, a thin portion is formed on the cover upper surface 1a (1b) between the mounting leg 4 and the cover side surface 2 as a portion where the cover upper surface is easily bent. Two
In the example shown in the drawing, the cover side surface 2 at the base of the mounting leg 4
Side is formed with a thin notch 5 on the cover upper surface 1a (1b). In the example shown in FIG. 3, a notch is formed on the cover upper surface 1a (1b) approximately in the middle between the mounting leg 4 and the cover side surface 2. 5 shows an example in which No. 5 is formed. If the cover upper surface 1a (1b) between the mounting leg 4 and the cover side surface 2 as in this example, the function and effect of the present invention can be obtained at any position.

In the embodiment shown in FIG. 4, a rounded portion 41 is formed near the base of the mounting leg 4 and extends along the base and toward the side surface 2 of the cover. As in this example,
When 41 is formed, the upper bulging pressure of the airbag B causes the upper surfaces 1a and 1b of the cover to be completely opened, so that the airbag is not affected by the subsequent deployment of the airbag B.
The same effect as that of the above embodiment is obtained. Although the rounded portion 41 is used in this example, it may be a thin wall, a notch, or the like.

The embodiment shown in FIG. 5 is a combination of the embodiment shown in FIG. 2 and the embodiment shown in FIG. That is, a notch 5 is formed in the cover upper surface 1a (1b) between the mounting leg 4 and the cover side surface 2, and a rounded portion near the base of the mounting leg 4 is extended along the base and toward the cover side surface 2 direction. 41 is formed. According to this example, the module cover K can be developed more favorably.

[Advantages of the Invention] According to the airbag device of the present invention, the module cover is provided with the cover side surface and the mounting leg attached to the retainer inside the cover side surface integrally. Since a thin-walled portion that is easy to expand and bend along the mounting leg is formed on the cover upper surface between the leg and the cover side surface, the movement of the cover upper surface and the cover side surface can be separated, and the cover upper surface can be separated. It is possible to prevent the side surfaces of the cover from interlocking with each other when the air bag is opened by the inflation of the airbag. Further, since the opening degree of the module cover can be increased, it is possible to prevent the airbag from rubbing against the back surface of the opened cover when the airbag is deployed, and prevent damage to both the airbag and the module cover. it can. Further, even when the side surface of the cover moves and collides with the mounting leg, the notch portion bends the side surface of the cover, so that the movement of the upper surface of the cover is not limited.

Also, since the top surface of the cover and the side surface of the cover are integrated,
It is also good in terms of design.

[Brief description of drawings]

1A to 1D show a first embodiment of the present invention. FIG. 1A is a plan view of a steering wheel, FIG. 1B is a schematic sectional view taken along the line I--I of FIG. 1A, and FIG. Fig. 1 is an enlarged view of part A of Fig. 1B, Fig. 1D is a schematic sectional view of the airbag when deployed,
2, 3, 4, and 5 are enlarged views similar to FIG. 1C showing the second, third, fourth, and fifth embodiments, respectively, and FIG. 6 shows a conventional example. It is a schematic sectional drawing at the time of airbag deployment. 1a, 1b …… Cover top surface, 2 …… Cover side surface, 3 …… Break line, 4 …… Mounting leg, 5 …… Spreading and bending easily recessed part and thin part (notch), 12 …… Retainer, 13 …… Gas generator mounting surface (flange), 41 ...... part that easily expands and bends (R section), B ... airbag, G ... gas generator, K ... module cover, S ... airbag device.

Claims (2)

[Scope of utility model registration request] 1. A retainer is fixed to a vehicle body side in front of an occupant, a gas generator is attached to substantially the center of the retainer, and an attachment end of an airbag is fixed to an attachment surface around the gas generator to generate the gas. An airbag folded so as to surround a gas injection hole of a container is covered with a rupturable and expandable module cover in which a cover upper surface and a cover side surface are integrated, and the module cover includes a cover side surface and a cover side surface. An airbag device integrally having a mounting leg that is concealed by a cover side surface inside and attached to the retainer, wherein a thin wall is provided on the upper surface of the cover between the mounting leg and the cover side surface along the mounting leg. An airbag device characterized in that a portion which is easily expanded and bent is formed. 2. The module cover extends between the connecting portion between the mounting leg and the module cover, near the base of the mounting leg with the cover, along the connecting portion and in the lateral direction of the cover, and is a rounded portion. The airbag device according to claim 1, wherein a portion that is easily expanded and bent is formed as the above.