JP3464858B2 - Cover body of airbag device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover body for an airbag device for a passenger in a passenger seat, for example, which injects gas to inflate and deploy the airbag.

[0002]

2. Description of the Related Art Conventionally, for example, an airbag device for a passenger in a passenger seat, which is attached to an instrument panel of an automobile, has been used. And this airbag device
A substantially cylindrical inflator and a folded airbag are housed in a case whose upper surface is an opening, and a resin cover body having a cover main body that covers the upper opening is formed using bolts and nuts. It is attached. Then, in the event of a vehicle collision, the air blown by the inflator inflates the airbag, and the pressure of this inflation causes the cover body to rupture along the fragile tear line and the airbag toward the front of the occupant. It is designed to expand and deploy.

[0003]

When the cover body is attached to the case body by using bolts and nuts as in the prior art, there is a problem that the attaching work is complicated and the manufacturing cost is increased. In this regard, it is conceivable that a mounting piece is provided on the back surface of the cover body of the cover body, and the mounting piece is engaged with the outside of the case body to be mounted. When a force is applied to open the cover body, the force is applied to the cover body through the reinforcing ribs formed on the back surface of the cover body, and especially when a substantially H-shaped tear line is formed, the appearance of the vicinity of the tear line is improved. Has a problem that gets worse.

The present invention has been made in view of the above points, and provides a cover body for an airbag device which can be easily attached to a member to be attached and which does not apply unreasonable stress to the tear line during the attaching work. The purpose is to

[0005]

Means for Solving the Problems] covers of airbag apparatus 請 Motomeko 1 described, covering the air bag of the air bag device
A cover main body, a pair of mounting piece portions projecting from the back surface of the cover main body and engaged and held on the outside of the mounted member, and
The back surface of the cover body and the side surface of the mounting piece are connected in series to supplement them.
And a reinforcing rib to strengthen only the reinforcing ribs adjacent to one of said mount piece, proximate the mounting piece portion
In addition, a weakened portion weakened from other portions is formed.

In this structure, the mounting piece is not attached.
A force is applied to the mounting piece when engaging and mounting the member
And the weak part of the reinforcing rib is deformed more easily than other parts.
As a result, it becomes easier to attach the cover body,
The deterioration of the appearance of the cover body is prevented. Further, since the weak portion is formed only on the reinforcing rib adjacent to one of the mounting pieces , the mounting work is facilitated by engaging the mounting piece on the side where the weak portion is formed with the rear portion, and The decrease in strength is suppressed.

According to a second aspect of the present invention, there is provided a cover body for an airbag device , which comprises a cover body for covering the airbag of the airbag device.
It is projected from the back surface of this cover body and engages with the attached member.
And the back side of the cover body
And a reinforcing rib formed in a grid shape for continuously reinforcing the side surface of the mounting piece portion, the reinforcing rib being the mounting piece portion.
A weakened area that is weaker than other areas is formed in the area close to
It was done .

In this structure, the mounting piece is not attached.
A force is applied to the mounting piece when engaging and mounting the member
And the weak part of the reinforcing rib is deformed more easily than other parts.
As a result, it becomes easier to attach the cover body,
The deterioration of the appearance of the cover body is prevented. In addition, the reinforcement
Since the bumps are formed in a lattice shape, the strength of the cover body is improved.

A cover body for an airbag device according to claim 3.
Is a cover body that covers the airbag of the airbag device,
It is projected from the back surface of this cover body and engages with the attached member.
And the back side of the cover body
And the side surface of the mounting piece portion are continuously provided to reinforce the mounting piece portion.
And a reinforcing rib formed on the outer side of the reinforcing rib.
The rib is closer to the mounting piece than the other parts.
A weakened weakened portion is formed.

In this structure, the mounting piece is not attached.
A force is applied to the mounting piece when engaging and mounting the member
And the weak part of the reinforcing rib is deformed more easily than other parts.
As a result, it becomes easier to attach the cover body,
The deterioration of the appearance of the cover body is prevented. In addition, the reinforcement
Since the knob is formed outside the mounting piece,
The cover body inside the one part can be easily torn and expanded.
It

According to a fourth aspect of the present invention, there is provided a cover body for an airbag apparatus according to any one of the first to third aspects, wherein the weak portion of the reinforcing rib has a smaller height than other portions. It is formed as follows.

In this structure, the weak portion can be easily formed .

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a cover body for an airbag device of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an instrument panel of a vehicle. Inside the instrument panel 1, an airbag device 11 for a passenger in a passenger seat is attached. The airbag device 11 includes a case body (retainer) 12 as an attached member having an opening 12a. Inside the case body 12, an inflator 14 for injecting gas and a folded airbag 15 are provided. And the mid retainer 16 and the like, and the opening 12a is covered with a cover body 18 made of resin. Note that FIG.
, The left side is the windshield side and the right side is the occupant side.

The case body 12 has a substantially U-shaped cross section with a rectangular opening 12a formed in the upper portion, and an inflator accommodating portion 21 is formed on the lower side through a narrow intermediate portion, and an upper side is formed. An airbag storage portion 22 is formed in the. In addition, a mounting plate 25, such as a bolt 24, is attached to the bottom of the case body 12.
Is fixed and fixed to a member on the vehicle body side. In addition, on the front and rear inner surfaces of the upper side of the inflator storage portion 21, inclined surface portions 28, 28 that widen downward are provided, and these inclined surface portions 28, 28 respectively extend in the longitudinal direction. Bolt through holes 29 are formed at predetermined intervals. Further, a plurality of engaging claws 31 each having a substantially C-shaped cross section are fixed to the front and rear outer surfaces near the upper end of the case body 12 at predetermined intervals.

The inflator 14 is for injecting gas from a gas injection port formed on the peripheral surface or one end, and is supported and fixed to both ends of the case body 12.

Further, the airbag 15 is a cloth bag and has a rectangular gas inlet 41 which follows the cross-sectional shape of the case body 12. Then, after being folded in a wave shape, they are stored in the airbag storage portion 22 in a state of being folded so as to be rolled up.

Further, the cover body 18 is integrally formed of resin or the like, and as shown in FIGS. 1 and 2, the cover body 43 which covers the opening 1a formed in the instrument panel 1.
And a mounting piece portion 44 of a substantially rectangular tube shape projectingly provided on the lower side of the cover body 43, and an engagement projecting on the lower side of the cover body 43 located outside the mounting piece portion 44, respectively. Located on the outside of the piece 45 and the attachment piece 44, the back surface of the cover body 43 and the attachment piece
Reinforcing ribs for continuously reinforcing the side surfaces of 44 and the engaging piece portion 45
46 and etc. are provided. And, in the mounting piece portion 44,
Mounting holes 47 are formed to be engaged with the engaging claws 31 of the case body 12, respectively. Further, each engaging piece portion 45 is formed with an engaging protrusion 48 that engages with an edge of the opening 1a of the instrument panel 1 or the like. Further, a tear line 49, which is located inside the mounting piece portion 44 and has a substantially H-shaped planar shape and is recessed and is weaker than other portions, is formed on the back surface side of the cover body 43.

Further, a reinforcing rib 46 continuously provided on the mounting piece 44
Among the predetermined plurality of reinforcing ribs 46, a weak portion 50 weaker than other portions of the reinforcing rib 46 is formed near the mounting piece portion 44. That is, in the other reinforcing ribs 46, the thickness dimension and the height dimension, that is, the projecting dimension from the back surface of the cover body 43 is substantially constant, whereas in the weak portion 50, it gradually increases toward the attachment piece portion 44. The height dimension is small and it is easy to deform when receiving external force.

The mid retainer 16 is formed, for example, by bending and cutting and raising a rectangular metal plate, and by tightening and fixing a bolt 55 inserted in the bolt through hole 29 with a nut 57. Is fixed inside the case body 12, holds the airbag 15, and
A predetermined space is secured between the inflator 15 and the inflator 14.

When assembling the airbag device 11, first, the airbag 15 is mounted on the mid retainer 16, then the mid retainer 16 is fixed in the case body 12, and then the airbag 15 is fixed. Fold the case body 12
Store inside. Subsequently, the opening 12a is covered with the cover body 18, first, the engaging claws 31 of the case body 12 are engaged with the mounting holes 47 of the mounting piece portion 44 on the front side, and then the rear side (passenger side) mounting One part
The engaging claw 31 of the case body 12 is engaged with the mounting hole 47 while deforming by applying force so as to expand the rear portion 44 to the rear side. Then, finally, the inflator 14 is inserted and fixed in the case body 12.

When an automobile collides, a sensor (not shown) detects the impact of this collision and activates the inflator 14. Then, the pressure of the gas injected from the inflator 14 causes the airbag 15 to inflate and deploy, causing the cover body 43 of the cover body 18 to tear along the tear line 49, and as shown by an imaginary line in FIG. Expand 43. Then, the airbag 15 projects from the case 12, expands and deploys toward the front side of the front of the occupant along the windshield, and protects the occupant.

As described above, according to the airbag device of the present embodiment, the cover body 18 can be attached to the case body 12 by engagement, so that the work can be performed more easily and the manufacturing cost can be reduced as compared with the structure using the bolt or the like. Can be reduced.

Since the reinforcing ribs 46 are formed on the back surface of the cover main body 43 in a grid pattern, the strength of the cover main body 43 can be improved, and the weak portions 50 are formed on the reinforcing ribs 46 in the vicinity of the mounting piece portion 44. Therefore, while suppressing a decrease in the strength of the cover body 18, the mounting piece portion 44 is easily and smoothly deformed to engage the engaging claw.
31 can be engaged, workability can be improved, and the cover body
It is possible to prevent the appearance of the tear line 49 and the like from being deteriorated by applying force to 43.

Further, since the weak portion 50 is formed close to the mounting piece portion 44, the reinforcing rib 46 at the weak portion 50 is also formed when the inflator 14 is actuated and the cover body 43 is torn and expanded along the tear line 49. Can be smoothly deformed to smoothly rotate the cover body 43.

The shape of the cover body is not limited to that of the above-described embodiment, and for example, as shown in FIG.
It is also possible to have a shape in which the engaging protrusion 48 shown in FIG.

Further, the weak portion 50 can be formed by reducing the height dimension, and can also be formed by gradually reducing the thickness dimension.

Further, in the above embodiment, since the front mounting piece 44 is engaged first, the weak portion 50 is formed close to the rear mounting piece 44. However, due to the layout and the like,
When the rear mounting piece 44 is engaged first, the weak portion 50 may be formed in the vicinity of the front mounting piece 44, and further, in the vicinity of the front and rear mounting pieces 44, the weak portion 50 may be weakened. The part 50 can also be formed.

[0029]

According to the cover of the airbag apparatus 請 Motomeko 1, wherein, according to the present invention, the mounting engages the mount piece to the mounting member
If a force is applied to the mounting piece during
Since it deforms more easily than the
And the cover body is
Can be prevented. Further, since the weak portion is formed only on the reinforcing rib adjacent to one of the mounting pieces , the mounting work can be facilitated by engaging the mounting piece portion on the side where the weak portion is formed later, and the strength of the reinforcing rib can be increased. Can be suppressed.

According to the cover body of the airbag apparatus of the second aspect , the mounting piece is engaged with the mounted member to be mounted.
At this time, if force is applied to the mounting piece,
The cover is attached because it deforms more easily than the part
Work is easy and the appearance of the cover body is poor
Can be prevented. Further, since the reinforcing ribs are formed in a lattice shape, the strength of the cover body can be improved, and the warp deformation after molding can be suppressed to improve the dimensional stability of the cover body.

A cover body for an airbag device according to claim 3.
According to this, the mounting piece is engaged with the mounted member to be mounted.
At this time, if force is applied to the mounting piece,
The cover is attached because it deforms more easily than the part
Work is easy and the appearance of the cover body is poor
Can be prevented. Furthermore, reinforcing ribs are attached to the outside of the mounting piece.
Since it was formed in a position, the cover inside the mounting piece
The main body can be easily torn and expanded.

According to the cover body of the airbag device of claim 4, in addition to the effect of any one of claims 1 to 3, the weak portion of the reinforcing rib has a height dimension smaller than that of other portions. Since it is formed, the weak portion can be easily formed .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a cover body of an airbag device of the present invention.

FIG. 2 is a rear view of the same cover body.

FIG. 3 is a cross-sectional view showing another embodiment of the cover body of the airbag device of the present invention.

[Explanation of symbols]

11 Airbag device 12 Case body as attached member 15 airbag 18 cover body 43 Cover body 44 Mounting piece 46 Reinforcement rib 50 weak part

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-7-17350 (JP, A) JP-A-7-205742 (JP, A) JP-A-8-127302 (JP, A) JP-A-8- 85406 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60R 21/16-21/32

Claims (4)

(57) [Claims] 1. A cover for covering an airbag of an airbag device.
And over the body, and a pair of mounting pieces to be engaged with and held on the outer side of the mounting member projecting from the rear surface of the cover body, these mosquitoes
The back side of the bar body and the side surface of the mounting piece are connected and reinforced.
And a reinforcing rib, only the reinforcing ribs adjacent to one of said mount piece, before
Serial to proximate portion to the mounting piece portion, the cover body features and to Rue airbag device that <br/> weak portion that is weakened than the other portion is formed. 2. A cover for covering an airbag of an airbag device.
-The main body and the part to be
Mounting pieces that are attached by engaging materials and these covers
A reinforcing rib formed in a grid shape for continuously reinforcing the back surface of the main body and the side surface of the mounting piece portion , wherein the reinforcing rib is provided in a portion close to the mounting piece portion,
It characterized in that the weak portion which is weakened from portions are formed
Cover of the airbags equipment. 3. A cover for covering an airbag of an airbag device.
-The main body and the part to be
Mounting pieces that are attached by engaging materials and these covers
A reinforcing rib formed on the outer side of the mounting piece for reinforcing the back surface of the main body and the side surface of the mounting piece in a continuous manner.
The reinforcing ribs may be attached to other parts near the mounting piece.
It characterized in that the weak portion which is weakened from portions are formed
Cover of the airbags equipment. 4. The cover body for an airbag device according to claim 1, wherein the weak portion of the reinforcing rib is formed so as to have a height dimension smaller than other portions.