JPH0623477Y2 - Cover member structure for airbags - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a steering wheel (handle) of an automobile.
The present invention relates to a structure of a cover member which is provided in front of a passenger seat and protects an occupant by inflating an airbag in an emergency such as a collision when covering the airbag in a folded state.

[Conventional technology]

Conventionally, as shown in FIG. 4, for example, the airbag assembly EA is mounted inside the steering wheel S. Here, the airbag assembly EA includes an inflator as a gas generator and an airbag made of canvas that is arranged so as to cover the inflator and greatly expands by the gas generated from the inflator. These inflators and airbags are attached to a box-shaped module housing made of sheet metal or hard resin. That is, an opening is formed in the central portion of the module housing, the inflator is attached so that the inflator is fitted into the opening, and the opening edge portion of the airbag is attached to the edge portion of the opening of the module housing through the retainer. Installed.

After the airbag is inflated, the airbag is provided with appropriate discharge holes so that when the occupant's face is supported, the airbag can deflate while discharging the gas in the airbag to the outside. There is.

In addition, the module housing is the steering wheel S
It is attached to the spoke 4 (spoke core metal portion) with a bolt and a nut.

Further, there is provided a box-shaped cover member 1 made of a soft resin (high-density urethane foam) for covering the airbag from the outside in a folded state of the airbag.
Is mounted on the module housing by covering the airbag and setting it.

By the way, in the end surface portion of the cover member 1 which covers the airbag, a fragile portion 1C is formed with a door-shaped contour (for example, an H shape) so that the airbag is cut to open the door around the hinge when the airbag is inflated. Has been done.

As shown in FIG. 5, a mesh member (mesh member) 2 is molded (interior) inside the cover member 1 to prevent the cover member 1 from being damaged, but it is torn off when the airbag is inflated. The mesh member 2 is not molded in the portion (fragile portion) 1C. That is, mesh member 2
Are provided so as to avoid the fragile portion 1C. That is, the mesh member 2 is cut into a shape as shown in FIG. As a result, the door-like mesh member portion 2 is attached to the door-corresponding portion 1A of the cover member 1.
A is installed inside, and a frame-shaped mesh member part 2B is installed inside the peripheral wall of the cover member 1.

Therefore, when the airbag inflates in an emergency such as a collision, the fragile portion 1C of the cover member 1 is instantly cut off, and the door-corresponding portion 1A of the cover member 1 serves as a door and the hinge-corresponding portion 1B of the cover member 1 is formed. The airbag is allowed to inflate even after that because it opens around the center.

Even when the airbag assembly EA is attached to the front of the passenger seat, the action of the airbag assembly EA is the same except that the attachment location is different.

[Problems to be solved by the invention]

By the way, in such a conventional airbag cover member structure, as described above, the mesh member 2 is cut into a shape as shown in FIG. At this time, since the mesh member 2 is molded in the cover member 1 without cutting,
When excessive pressure is generated in the airbag and the cover member 1 is torn and broken at the fragile portion 1C, the cover member 1
The stress is concentrated on the edge portion 2a (see FIG. 6) of the mesh member portion 2C located at the hinge-corresponding portion 1B of the door-corresponding portion 1A, and a crack may be generated from this portion, and the cover member may be scattered. There is.

In addition, Japanese Patent Application No. Sho 49-84768 (Japanese Utility Model Sho 51-144)
(See No. 48), a microfilm with a mesh member inserted into the cover member is proposed.
Practical application Sho 49-42134 (Actual development Sho 50-131741)
(See No.), a reinforcing member is provided at the base of the cover member to prevent scattering, but these structures have a problem that the cover member has insufficient scattering preventing property. is there.

In addition, the technique of Japanese Patent Application No. 49-84768 and Japanese Patent Application No.
Even if the technologies of No. 42134 are collected together, the actual application is Sho 4
Since the reinforcing member of No. 9-42134 is inserted into the base portion of the airbag cover and is present in the entire hinge portion, only the one that reinforces the entire portion of the mesh corresponding to the hinge can be obtained.

The present invention is intended to solve such problems,
An object of the present invention is to provide an airbag cover member structure in which the cover member is prevented from scattering when the airbag is inflated by devising the structure of the edge portion of the mesh member portion where the hinge equivalent portion of the cover member is located. .

[Means for solving problems]

Therefore, the airbag cover member structure of the present invention is a box-shaped resin cover member that is disposed so as to cover the gas generator and covers the airbag that is inflated by the gas generated from the gas generator in a folded state. A fragile portion is formed with a door-shaped contour at the end surface portion of the cover member covering the airbag so that the door is opened around the hinge when the airbag is inflated, and the fragile portion is formed. In order to avoid the portion, a door-shaped mesh member is installed in the door-corresponding part of the cover member, and a frame-shaped mesh member is installed in the peripheral wall part of the cover member, and the door-corresponding part of the cover member is installed. In the edge portion of the mesh member portion which is located at a portion corresponding to the hinge and which connects the door-shaped mesh member and the frame-shaped mesh member, from the side edge of the door-shaped mesh member to the frame-shaped mesh member. Over the upper edge of the timber, it is characterized in that a reinforcing member made of a fibrous material or elastic material is attached.

[Action]

In the above-described airbag cover member structure of the present invention, when the airbag is inflated in an emergency such as a collision, the fragile portion formed by the door-shaped contour in the cover member is cut and the hinge equivalent portion of the cover member is centered. Similarly, the part corresponding to the door of the cover member opens in connection with the door. At this time, at the edge of the mesh member portion that connects the door-shaped mesh member and the frame-shaped mesh member located at the portion corresponding to the hinge, from the side edge of the door-shaped mesh member to the upper edge of the frame-shaped mesh member, the fiber material or Since the reinforcing member made of an elastic material is attached, even if stress is concentrated on this mesh member portion, it can withstand stress, and thus the cover member does not scatter.

〔Example〕

An airbag cover member structure as one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the mesh member, and FIG. 2 is a partial enlarged view of a portion II of FIG. FIG. 3 is a sectional view taken along the line III-III in FIG. 2, and the same reference numerals as those in FIGS. 4 to 6 in FIGS.

Also in this embodiment, as shown in FIG. 4, the airbag assembly EA is mounted inside the steering wheel S. Here, the airbag assembly EA is provided so as to cover the inflator as a gas generator, and has an airbag made of canvas that greatly expands by the gas generated from the inflator. The airbag is attached to a box-shaped module housing made of sheet metal or hard resin. That is, an opening is formed in the central portion of the module housing, the inflator is attached so that the inflator is fitted into the opening, and the opening edge portion of the airbag is attached to the edge portion of the opening of the module housing through the retainer. Installed.

Further, a box-shaped cover member 1 made of a soft resin (high-density urethane foam) that covers the airbag from the outside in a folded state of the airbag is provided. The cover member 1 covers the airbag from the outside. Aligned and mounted on the module housing in a set to cover.

Further, a fragile portion 1C having a door-shaped contour (for example, an H-shape) is formed in an end surface portion of the cover member 1 which covers the airbag so that the airbag is cut to open the door around the hinge when the airbag is inflated. Has been done.

A mesh member (mesh member) 2 is molded in the cover member 1 in order to prevent the cover member 1 from being damaged, but a portion (fragile portion) 1C torn off when the airbag 3 is inflated, The mesh member 2 is not molded. That is, the mesh member 2 is provided so as to avoid the fragile portion 1C. That is, the mesh member 2 is the first
It is cut into a shape as shown in the figure and is molded on the cover member 1. Thereby, the door-corresponding portion 1A of the cover member 1
The door-shaped mesh member portion 2A is installed inside, and the frame-shaped mesh member portion 2B is installed inside the peripheral wall portion of the cover member 1.

By the way, the edge portion (corner portion) 2a of the mesh member portion 2C located at the hinge-corresponding portion 1B of the door-corresponding portion 1A of the cover member 1 has the side of the door-shaped mesh member portion 2A as shown in FIGS. The reinforcing member 3 is attached from the edge to the upper edge of the frame-shaped mesh member portion 2B.
Here, the reinforcing member 3 is made of fiber material or elastic material,
Although the reinforcing member 3 is attached by sewing or bonding, the reinforcing member 3 may be attached by lightly sandwiching it between the edge portions 2a of the mesh member portion 2C.

Therefore, when the airbag is inflated in an emergency such as a collision, the fragile portion 1C of the cover member 1 is instantly cut and the door-corresponding portion 1A of the cover member 1 serves as a door and the hinge-corresponding portion 1B of the cover member 1 is formed. , But at this time, the edge portion 2a of the mesh member portion 2C positioned at the hinge-corresponding portion 1B of the cover member 1 which is the weakest portion of the mesh member 2.
Is formed as a reinforcing edge portion reinforced by the reinforcing member 3, so that even if stress is concentrated on the edge portion (corner portion) 2a of the mesh member portion 2C, it can sufficiently withstand. As a result, only the door-corresponding portion 1A can be opened without scattering the cover member 1.

Also, when the airbag assembly EA is attached to the front of the passenger seat, the airbag assembly EA having the cover member having this structure is used, only the attachment location is different.

[Effect of device]

As described above in detail, according to the airbag cover member structure of the present invention, the box which is arranged so as to cover the gas generator and covers the airbag inflated by the gas generated from the gas generator in a folded state. -Shaped resin cover member,
A fragile portion is formed with a door-like contour so that the end portion of the cover member covering the airbag is cut so that the door opens around the hinge when the airbag is inflated, and the fragile portion is avoided. As described above, a door-shaped mesh member is provided in the door-corresponding portion of the cover member, and a frame-shaped mesh member is provided in the peripheral wall portion of the cover member, and a hinge is provided in the door-corresponding portion of the cover member. The edge portion of the mesh member portion which is located in a portion and which connects the door-shaped mesh member and the frame-shaped mesh member has a fiber material or a side surface from the side edge of the door-shaped mesh member to the upper edge of the frame-shaped mesh member. Inflating the airbag by reinforcing only the weakest part of the mesh member installed in the cover member with a simple structure in which a reinforcing member made of an elastic material is attached. There is an advantage that can open the door corresponding portions of the cover member smoothly and reliably without scattering the cover member.

[Brief description of drawings]

1 to 3 show the structure of an air bag cover member as an embodiment of the present invention. FIG. 1 is a perspective view of the mesh member, and FIG. 2 is an enlarged view of a portion II of FIG. Partial view shown in FIG. 3 is a sectional view taken along the line III-III in FIG.
FIG. 5 is a schematic view showing an example of attaching an airbag assembly to a steering wheel, FIGS. 5 and 6 show a conventional airbag cover member structure, and FIG. 5 is a perspective view of the mesh member thereof. FIG. 6 is an enlarged partial view of the VI portion of FIG. 1 ... Cover member, 1A ... Door equivalent part, 1B ... Hinge equivalent part, 1C ... Fragile part, 2 ... Mesh member, 2
A ... Door-shaped mesh member part, 2B ... Frame-shaped mesh member part, 2C ... Mesh member part, 2a ... Mesh member part edge, 3 ... Reinforcing member, 4 ... Spoke, EA
…… Airbag assembly, S …… Steering wheel.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 51-14448 (JP, U) Sho 50-131741 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A box-shaped resin cover member, which is arranged so as to cover a gas generator and covers an airbag which is inflated by gas generated from the gas generator in a folded state, and the air in the cover member is provided. A fragile portion is formed in a door-like contour so that the end portion covering the bag is cut to open the door around the hinge when the airbag is inflated, and the cover is provided so as to avoid the fragile portion. A door-shaped mesh member is provided in the door-corresponding portion of the member, and a frame-shaped mesh member is provided in the peripheral wall portion of the cover member, which is located at a hinge-corresponding portion in the door-corresponding portion of the cover member. The edge portion of the mesh member portion connecting the mesh member and the frame mesh member includes a fiber material or an elastic member extending from a side edge of the door mesh member to an upper edge of the frame mesh member. Characterized in that a reinforcing member made of wood is attached, the cover member structure for an air bag.