JPH0427637A - Air bag storage cover - Google Patents

Abstract

PURPOSE:To surely prevent a cover from scattering, by providing a high strength part for preventing propagation of breakage, in the terminal end part of each tear line which initiates the breakage upon operation of an air bag so that the breakage of the cover is stopped at the terminal end of the tear line. CONSTITUTION:A cover is formed therein with a center tear line 2, and end tear lines 3, 4 for initiating breakage upon operation of an air bag. Further, the center tear line 2 is extended longitudinally of the cover in the center part of the cover 1. Meanwhile, the tear lines 3, 4 are extended transversely of the cover 1 in the vicinity of the ends of the cover 1. In this case, a bead part It serving as a high strength part is laid on each end side of the tear lines 3, 4 so that the bead part It blocks the prolonging of the tear lines 3, 4. Accordingly, if breakage is initiated in the vicinity of the center, it spreads smoothly along the tear lines 2, 3, 4 UP to their terminal end parts. Since the provision of the bead parts It, further propagation of the breakage can be prevented.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a cover for housing an airbag that operates, inflates and deploys by sensing the impact, deformation, etc. of a vehicle collision. .

[Prior Art] A conventional cover is provided with a tear line so that the bag storage cover is torn from a predetermined line when the airbag is activated. This tear line may be one in which grooves are continuously or semi-continuously formed in the form of perforations at the planned tear line. The depth of the beach may be increased at intervals. Further, in cases where the cover has a two-layer laminated structure of a hard layer and a soft layer, there is also one in which a slit is formed in the hard layer along the tear line.

[Problem to be solved by the invention] In the conventional airbag storage cover described above, after the tearing starts from the tear line near the center of the cover and reaches the end of the tear line, the inertia of the tear piece further causes It may progress to areas other than the tear line and eventually reach the end of the cover. If the cleavage spreads to areas other than the tear line, there is a possibility that the cleaved pieces will be torn off and scattered, so measures must be taken to prevent them from scattering, leading to an increase in costs.

[Means for Solving the Problems] The airbag storage cover of the present invention is provided with a tear line for starting tearing at the start of airbag operation, and a tear line is provided at the end t4 of the tear line to prevent tear propagation. It is characterized by the provision of a high-strength part for prevention.

[Function] In the airbag storage cover of the present invention, once the cover starts to tear, the tear spreads to the end along the tear line. Once this cleavage reaches the end of the tear line, further propagation is prevented by the high strength portion of the end portion.

[Examples] The present invention will be described in more detail below with reference to embodiments shown in the drawings.

FIG. 1(a) is a bottom view of an airbag storage cover according to an embodiment of the present invention, and FIG. 1(b) is a B-B in FIG. 1(a).
1(C) is a sectional view taken along the line CC in FIG. 1(b), FIG. 2 is a sectional view taken along line II-11 in FIG. Sectional view along line III-III, No. 4
The figure is a sectional view taken along line IV-rV in FIGS. 1.3, and FIG. 5 is a sectional view taken along line V-V in FIGS. 1 and 3. In addition, the fifth
FIG. 5(a) is a cut end view, and FIG. 5(b) is a cut sectional view. Moreover, FIG. 3.4.5 is an enlarged view.

This cover 1 has a substantially rectangular shape, and is provided with tear lines as a center tear line 2 and end tear lines 3 and 4 for initiating tearing when the air bag is activated. The central tear line 2 extends in the longitudinal direction of the cover 1 through the central portion of the cover 1. The tear line 3.4 extends in the transverse direction of the cover 1 and is provided along the vicinity of the end of the cover 1. Note that the tear line 2 and the tear line 3.4 are provided so as to be continuous.

The end portions of the tear lines 3 and 4 reach halfway up the side wall portion of the cover 1. And this tear line 3,
A convex portion 1t serving as a high-strength portion is provided so as to block the extension direction of 4. In this embodiment, the convex portion 1t consists of a short arc-shaped convex strip, and is provided so as to surround the end portion of the tear line 3.4.

These tear lines 2, 3.4 are continuously extending grooves 5.
As shown in FIG. 4, this groove 5 has a triangular cross-section. In addition, as shown in FIG.
It has a pentagonal shape with a sloped surface 6b formed to have a triangular cross-sectional shape at the bottom thereof. The concave portion 6 has a hexagonal shape when viewed from the bottom of the cover 1, and two opposing vertices of the hexagon form a tear line 2.3.
．． It is formed so that it is arranged along the center line of 4.

In the center part of the cover (board center part) of the central tear line 2, the recesses 6 are densely formed with a small distance between adjacent recesses. And from this central part, 1IFl,
As the distance between the recesses 6 approaches the tear lines 3 and 4, the distance between the recesses 6 becomes larger, and the recesses 6 are so-called sparsely provided.

In the tear line 3.4, the intervals between the recesses 6 are almost equal to each other, but as in the tear line 2, the intervals between the recesses 6 are small near the longitudinal center of the tear line 3.4. Alternatively, the distance between the recesses 6 may become larger as the distance from the recesses 6 increases.

Note that the cover may have a multilayer structure or a single layer structure. Moreover, it may have an insert material.

In the cover 1 configured in this manner, when the inflation pressure of the airbag is applied, the center portion of the cover 1 is most vulnerable, and therefore rupture starts from the center portion. - Once the cleavage begins near the center, it quickly spreads along the tear line 2.34 to the distal end.

When this cleavage reaches the end of the tear line 3.4, the protrusion it is provided to prevent further propagation of the cleavage, and the tear stops at the end of the tear line 3,4. Therefore, it is reliably prevented that the cleavage progresses excessively and the cleavage pieces are torn to pieces.

In this embodiment, the apex portion of the recess 6 is located on the center line of the groove 5, and the cleavage that occurs in the recess 6
It is quickly transmitted to other groove portions 5 as well. Even in the groove portion 5, the center line portion thereof is the thinnest portion, and the cleavage quickly spreads along the center line of the groove portion 5.

In the above embodiment, the convex portion 1t constitutes a high-strength portion, but in the present invention, a member having higher strength than the cover material, such as a metal mesh, a metal plate, or a high-strength synthetic resin material, is embedded in the tear line end portion. (for example, an insert) to prevent further propagation of cleavage.

The arrangement of the tear line and the cross-sectional shape of the tear line shown in the drawings are merely examples of the present invention, and it is clear that the tear line may have a different arrangement and cross-sectional shape than that shown in the drawing.

Further, the end portion of the tear line may be provided at a position other than that shown in the drawings, for example, it may be located near the edge E of the cover 1 in FIG. 1(b) or at the ceiling F of the cover, and A high-strength portion may be provided to prevent crack propagation.

[Effects of the Invention] As is clear from the above embodiments, the airbag storage cover of the present invention reliably stops the cover from tearing at the end of the tear line when the airbag is deployed, thereby preventing further propagation. be done. Therefore, scattering of the cover is reliably prevented. Also, for this reason, the strength required for the cover,
This eliminates the need for a cover scattering prevention mechanism for the airbag device, allowing for a simpler configuration and lower costs.

[Brief explanation of the drawing]

FIG. 1(a) is a bottom view of a cover according to an embodiment of the present invention;
FIG. 1(b) and FIG. 1(C) are sectional views of main parts of the cover,
FIG. 2 is a sectional view taken along line 11-IT in FIG. 1. 3, 4, and 5 are enlarged sectional views of the main parts of FIG. 1, respectively. 1... Cover, 1t... Convex part (high strength part),
2.3.4... Tear line, 5... Groove, 6... Recess. Agent Patent Attorney Tsuyoshi Shigeno

Claims (1)

[Claims] An airbag storage cover provided with a tear line for starting tearing when the airbag starts operating, characterized in that a high-strength part for preventing tear propagation is provided at the end of the tear line. cover.