JP2001171455A - Lid structure of air bag device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of uneven luster to the surface side of a lid body. SOLUTION: This lid structure of an air bag device for a vehicle has the lid body 3 formed of a monolayer injection-molded product of thermoplastic elastomer to cover the upper part of an air bag module body; leg parts 6 provided on the back face side of the lid body 3 and extending almost downward along the peripheral edge part of a swelling opening of a bag body; and a number of reinforcing ribs 21 provided outside of the leg parts 6 on the back face side of the lid body 3. Injection molding resin is cast toward the leg part 6 from an injection gate 11 provided at the outer peripheral part of the lid body 3. The reinforcing rib 2 is positioned between the injection gate 11 and the leg part 6 and extends in a direction of intersecting the leg part 6, and a rib cut-off part for cutting off connection between the reinforcing rib 21 and the leg part 6 is formed between the reinforcing rib 21 and the leg part 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid structure of a vehicle airbag device provided in a vehicle such as an automobile.

[0002]

2. Description of the Related Art Some vehicles such as automobiles have an airbag device as an emergency safety means. In the above airbag device, when an impact force of a predetermined value or more is applied to a vehicle body, a bag body folded and stored in an airbag module body disposed inside an instrument panel or the like generates pressure from an inflator. It is swelled toward the occupant side by the pressure of the gas and receives the head and the like of the occupant seated in a fixed position to protect the head and the like from coming into contact with the instrument panel and the like.

[0003] When the bag body is inflated, the bag body presses an air bag grid portion formed in the instrument panel, and cleaves a cleavage line formed in the air bag grid portion to form a bulging opening. The swelling portion is swelled toward the passenger in the vehicle cabin.

As shown in FIGS. 3 and 4, the air bag grid portion closes an opening 2 formed in the instrument panel 1 to cover an upper portion of the air bag module main body. A locking claw 4 formed at a peripheral portion on the back side of the device and capable of locking to a peripheral portion of the opening 2;
A cleavage groove 5 formed in the rear surface of the lid body 3 and having a substantially H-shape in plan view, and a substantially rectangular frame projecting substantially obliquely downward from the rear surface side of the lid body 3 along the peripheral edge of the bulging opening. And these are integrally formed by single-layer injection molding of a thermoplastic elastomer.

The legs 6 are provided for mounting the airbag module main body or for guiding the bag main body when inflated.

A large number of reinforcing ribs 10 such as vertical ribs 8 and horizontal ribs 9 are formed at positions outside the legs 6 on the rear surface side of the lid body 3 to increase rigidity. Also,
In FIG. 4, the position of the black dot on the outer peripheral portion of the lid body 3 is the injection gate 11.

In FIG. 3, reference numeral 13 denotes a thinned portion formed outside the base of the leg 6.

[0008]

However, in such a conventional lid structure of a vehicle airbag device, a position corresponding to the inside of the leg 6 near the injection gate 11 on the surface of the lid body 3 is shown in FIG. Uneven gloss 1 as shown in 4
2 had occurred.

This is because, of the resin injected from the injection gate 11 at the time of injection molding, a flow difference occurs between the resin that has passed through the general meat portion of the lid body 3 and the resin that has passed through the vertical ribs 8.
It is presumed that the unevenness of gloss 12 occurs due to the change in the orientation of the resin due to the difference in the flow. That is, those that have passed through the general meat portion of the lid body 3 are reduced in thickness formed outside the leg portion 6. In the part 13, the flow once slows down and then reaches the leg 6. On the other hand, the flow through the vertical ribs 8 is large due to the large cross-section of the flow path.
Is continuous with the leg 6, so that a large amount of resin
3, the vehicle directly reaches the leg 6 without being decelerated. This seems to be the cause of the flow difference.

[0010] As described above, when the uneven gloss 12 occurs on the surface of the lid body 3, repair such as painting must be performed in order to eliminate the unevenness 12, and wasteful cost and labor are required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lid structure of a vehicle airbag device which can solve the above-mentioned problems and can prevent the occurrence of uneven gloss on the surface side of the lid body. .

[0012]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, there is provided a lid body made of a single-layer injection-molded article of a thermoplastic elastomer and covering an upper portion of an airbag module body; Legs provided on the back side of the lid body and extending substantially downward along the periphery of the bulging opening of the bag body, and a number of reinforcing ribs provided outside the legs on the back side of the lid body In the lid structure of a vehicle airbag device in which an injection molding resin is poured from an injection gate provided on an outer peripheral portion of the lid body toward the leg portion, the lid structure from the injection gate to the leg portion is provided. A rib cut portion is provided between the leg portion and the reinforcing rib located between and extending in a direction intersecting with the leg portion.

According to the first aspect of the present invention, a reinforcing rib located between the injection gate and the leg and extending in a direction intersecting the leg is provided between the leg and the reinforcing rib. By forming a rib cut portion that divides the connection between the two, during injection molding, of the resin injected from the injection gate, the resin that passed through the reinforcing rib, once passed through the general cut portion at the rib cut portion, Since it reaches the legs, there is almost no flow difference between the resin that has passed through the general meat part of the lid body and the resin that has passed through the reinforcing ribs from the beginning, and the resin flow changes due to the flow difference. A situation in which gloss unevenness occurs is prevented.

As described above, if the occurrence of gloss unevenness is prevented, there is no need to repair the coating or the like, and it is possible to eliminate the coating, so that unnecessary cost and labor can be reduced.

[0015]

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention. Note that the same or equivalent parts as those in the conventional example are denoted by the same reference numerals and description thereof will be omitted.

First, the construction will be described. In the first embodiment, the lid body 3 is formed by injection molding a single layer of a thermoplastic elastomer so as to have a general thickness of 2 mm to 5 mm.

Of the reinforcing ribs 10, those located between the injection gate 11 and the leg 6 and extending in a direction intersecting the leg 6 (corresponding to the vertical rib 21 in FIGS. 1 and 2). And a leg cut portion 22 for separating the connection between the two.

Next, the operation of the first embodiment will be described.

A vertical rib 21 located between the injection gate 11 and the leg 6 and extending in a direction intersecting with the leg 6, and a rib cut portion 22 for separating the connection between the leg 6 and the leg 6.
Formed at the time of injection molding,
Of the resin injected from the vertical rib 21
After passing through the general meat portion of the lid body 3 once at the rib cut portion 22, it reaches the thinned portion 13 on the side of the leg 6, so that the speed is effectively decelerated by the thinned portion 13.

Therefore, there is almost no difference in flow between the resin that has passed through the general meat portion of the lid body 3 and the resin that has passed through the vertical ribs 21 from the beginning. Is prevented from occurring.

As described above, when the occurrence of gloss unevenness is prevented, there is no need to repair the paint or the like, and it is possible to eliminate the need for painting. Therefore, it is possible to reduce unnecessary cost and labor.

[0023]

As described above, according to the first aspect of the present invention, between the reinforcing rib located between the injection gate and the leg and extending in the direction intersecting with the leg, In addition, by forming a rib cut portion that disconnects the connection between the two, during injection molding, of the resin injected from the injection gate, the resin that passed through the reinforcing rib, once in the rib cut portion,
After being passed through the general meat section, it will reach the legs,
From the beginning, there is almost no flow difference between the resin that has passed through the general meat part of the lid body and the resin that has passed through the reinforcing ribs, and the flow difference may change the orientation of the resin and cause uneven gloss. Is prevented.

As described above, when the occurrence of gloss unevenness is prevented, there is no need to repair the coating or the like, and it is possible to eliminate the coating, so that unnecessary cost and labor can be reduced. That is, it can exert a practically useful effect.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view in the vehicle front-rear direction of a lid body according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the lid body of FIG. 1;

FIG. 3 is a cross-sectional view in the vehicle front-rear direction of a lid body according to a conventional example.

FIG. 4 is a bottom view of the lid body of FIG. 3;

[Explanation of symbols]

 3 Lid Body 6 Leg 10 Reinforcement Rib 11 Injection Gate 21 Vertical Rib 22 Rib Cut

Claims (1)

[Claims] 1. A lid body made of a single-layer injection-molded article of a thermoplastic elastomer and covering an upper portion of an airbag module body, and a lid provided on a back side of the lid body and along a peripheral edge of a bulging opening of the bag body. It has a leg extending substantially downward, and a number of reinforcing ribs provided outside the leg on the rear surface side of the lid body, from an injection gate provided on the outer periphery of the lid body toward the leg. A lid structure for a vehicle airbag device into which injection molding resin is poured, wherein the reinforcing rib is located between the injection gate and the leg and extends in a direction crossing the leg. A lid structure for an airbag device for a vehicle, characterized in that a rib cut portion for separating the connection between the two is formed between the airbag and the airbag device.