JPH0826060A - Structure of air bag door for automobile - Google Patents

Abstract

PURPOSE:To improve the external appearance by shortening the distance from a rotary shaft part in the part towards the undersurface side from the upper surface side at the front end part of an air bag door and increasing the distance from the rotary shaft part in the part towards the undersurface side from the door upper surface side, at the cut part front end part and the rear end part of the air bag door. CONSTITUTION:In the cut part 15 at the rear part 14 of an air bag door 10, a car room side member 30 intrudes, and a rotary shaft part 25 is embedded into a car room side member 30. Further, at the front end part 11 of the air bag door 10 and the opened port front edge part 31 of an air bag development opened port part 35, the distance from the revolution center O of the rotary shaft part 25 to an abutment part J1 is shortened gradually from the door upper surface 10A side to the undersurface 10B side. Further, at the j2 abutment part J2 between the cut part front edge part 12 of the air bag door 10 and an opened port front edge part 32 and an abutment part J3 between the cut part rear end part 13 and an opened port rear edge part 33, the distance from the center O of the rotary shaft part 25 is gradually increased towards the undersuface 10B from the door upper surface 10A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an automobile air bag door.

[0002]

2. Description of the Related Art In recent years, an airbag device has been provided in order to safely protect an occupant of a vehicle from the impact of a collision.
As shown in FIGS. 9 and 10, this airbag device 1
00 is provided inside the vehicle-cabin-side member (instrument panel) 101 on the front side on the passenger side, for example. On the other hand, a deployment opening portion 103 for the airbag 102 is provided at a predetermined position of the passenger compartment member 101, and the deployment opening portion 103 is in a flat state when the airbag door 1 is opened.
Covered by 04.

When the automobile receives a large impact due to a collision or the like, the airbag 102 housed in the airbag case 105 is inflated and the airbag door 1 is closed.
04 is pushed open from the inside, and the airbag 102 is deployed into the vehicle compartment through the deployment opening 103. Reference numeral 1 in FIG.
06 is a door hinge attached to the case 105,
Reference numeral 7 is a lean hose for holding the airbag case 105 on the vehicle body.

By the way, in such an airbag door structure, the airbag door 104 is molded separately, and the passenger compartment member 10 is formed.
It is usually fitted into the expansion opening 103 formed in No. 1 and attached.

That is, the airbag door 104, which is formed separately from the passenger compartment member 101, is re-fitted and attached to the airbag deployment opening 103 of the passenger compartment member 101 via another member such as the hinge 106. However, this installation work is by no means easy, and the cost of the installation process cannot be ignored.

Further, the attachment of the airbag door 104 to the airbag deployment opening 103 is not only a complicated task itself, but also difficult to be accurately attached. Conventionally, the clearance between the air bag door 104 and the air bag deployment opening 103 is increased to improve the efficiency of the air bag door mounting work. There was a problem that the lines became gaps and conspicuously impaired the appearance of the product.

In view of these problems, the present inventors have
First, in Japanese Patent Application No. 5-314311, an annular rib is provided along the outer periphery of the back surface of the airbag door, and at least the outer peripheral surface of the annular rib is formed by the joining force of the resin material constituting the panel when the instrument panel is molded. I proposed the structure of the instrument panel which has the airbag door integrally, which is integrally connected with the instrument panel.

According to this proposal, since the airbag door is integrally joined to the instrument panel at the same time when the instrument panel is molded, the gap between the airbag door and the instrument panel can be eliminated. However, even with this structure, it is necessary to attach the hinge of the airbag door to the airbag case, and there has been a demand for an airbag door structure that can further simplify the process.

[0009]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and further promotes the integral molding of the airbag door and the passenger compartment member to form a joint structure. Accordingly, it is an object of the present invention to provide a structure of an automobile air bag door in which the boundary line between the air bag door and the air bag deployment opening of the vehicle interior side member is not conspicuous on the surface and has an excellent appearance. At the same time, the present invention provides a structure of an airbag door for an automobile, which eliminates the conventional door hinge by embedding the rotating shaft portion in the vehicle interior side member and thus can simplify the mounting process of the airbag door. Is what you are trying to do.

[0010]

That is, the present invention provides:
An airbag door formed in contact with an opening edge portion of an airbag deployment opening formed in a vehicle compartment side member, wherein a rear end portion of the airbag door is provided with a cutout portion around which a rotary shaft portion is bridged. The rotating shaft portion is embedded in the passenger compartment side member by inserting the passenger compartment member into the notch, and the front end portion of the airbag door and the opening front edge portion of the passenger compartment member are provided. The joint portion with is configured such that the distance from the rotating shaft portion is shortened from the upper surface side to the lower surface side of the door,
The joint portion between the front end portion of the notch portion of the airbag door and the vehicle compartment side member is configured such that the distance from the rotary shaft portion becomes longer from the door upper surface side to the lower surface side, and the rear end portion of the airbag door. And an opening rear edge portion of the vehicle compartment side member is configured so that a distance from the rotating shaft portion becomes longer from the door upper surface side to the door lower surface side of the automobile airbag door. Related to the structure. The rotary shaft portion refers to the airbag door that rotates about the shaft, but the shaft itself may be rotatable at the same time.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a plan view of an airbag deployment opening of a vehicle interior side member showing an example of the structure of the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, FIG. 3 is a perspective view of an airbag door, and FIG. Is a cross-sectional view showing a main part of the structure of the present invention, FIG. 5 is a cross-sectional view of a molding die for manufacturing an automobile airbag door of the present invention, and FIG. 6 is a vehicle interior side member manufactured by using the obtained airbag door. FIG. 7 is a sectional view showing a molding die, FIG. 7 is a sectional view showing its molding state, and FIG. 8 is a sectional view showing another example of the structure of the present invention.

1 and 2 show an airbag door structure of the present invention. The passenger compartment member 30 is made of synthetic resin and formed into a panel shape such as an instrument panel, and an airbag deployment opening 35 is formed at a predetermined position thereof. Preferred materials for the passenger compartment member 30 include talc-filled polypropylene and glass fiber reinforced AS resin. Molding shrinkage (ASTM D955) to prevent deformation of the joint with the airbag door.
Is preferably 10/1000 or less. An airbag door 10 is formed in the airbag deployment opening 35 of the passenger compartment member 30 so as to be in contact with the opening edge.

The airbag door 10 is made of synthetic resin,
The airbag deployment opening 35 is integrally fitted into the airbag deployment opening 35 so as to close the airbag deployment opening 35, and the outer periphery thereof is in contact with the opening edge of the airbag deployment opening 35. The airbag door 10 is made of a resin material that is incompatible with each other and has a higher softening temperature than that of the material forming the surrounding cabin-side member 30, and particularly when the airbag is inflated. High impact strength (IZOD impact strength at -40 ° C is 10 kg · cm / cm or more: ASTM D25
It is desirable to have 6).

For example, when the resin material forming the passenger compartment member 30 is talc-filled polypropylene, the resin material forming the airbag door 10 is an alloy product of polycarbonate resin and polybutylene terephthalate resin, or polycarbonate. An alloy product of a resin and an acrylonitrile / styrene / butadiene resin or a polyester elastomer is used. Also, the passenger compartment member 3
0 is acrylonitrile reinforced by glass fiber-
When using styrene resin, airbag door 1
0 is preferably an alloy product of a polyphenylene oxide resin and a polystyrene resin.

A notch 15 is provided in the rear portion 14 of the airbag door 10. As shown in FIG. 3, one or a plurality (three in this example) of the notches 15 are provided in the airbag door 10, and a rotary shaft portion 25 is stretched over the notches 15. . The rotating shaft portion 25 serves as a shaft portion when the airbag door 10 is released, and is made of a round bar of iron or aluminum in this example. As shown in FIGS. 1 and 2, the vehicle-cabin-side member 30 is inserted into the notch portion 15, and as a result, the rotary shaft portion 25 hung over the notch portion 15 has the vehicle-cabin-side member 30. It is buried inside.

The rotary shaft portion 25 may be integrally formed of the resin material forming the airbag door 10. In that case, since it is necessary to impart high impact resistance to the rotary shaft portion 25, the material forming the airbag door 10 has an IZOD impact strength of 30 k at -40 ° C.
It is desirable to have g · cm / cm or more.

Next, the airbag door 10 and the passenger compartment member 3
The contact state with 0 will be described. First, FIG. 4 (A)
As shown in FIG. 2, the joint portion J1 between the front end portion 11 of the airbag door 10 and the opening front edge portion 32 of the airbag deployment opening portion 35 is located from the rotation center O of the rotary shaft portion 25 to the joint portion J1.
Is configured to gradually decrease from the door upper surface 10A side to the lower surface 10B side.

Also, as shown in FIG. 4B, the joint portion J2 between the front end portion 12 of the cutout portion and the rear edge portion 33 of the opening of the airbag door 10 has a center of rotation O of the rotary shaft portion 25. To the joint portion J2 is gradually increased from the door upper surface 10A to the lower surface 10B. Further, as shown in the same figure, the joint portion J3 between the notch rear end portion 13 of the airbag door 10 and the opening rear edge portion 33 of the airbag deployment opening portion 35 rotates like the joint portion J2. The distance from the center O of the shaft portion 25 to the joint portion J3 is gradually increased from the door upper surface 10A to the lower surface 10B.

That is, as understood from FIG. 4 (A), the shape of the joint portion J1 is a point 11 from the upper surface 10A to the lower surface 10B in the thickness direction of the airbag door 10.
When A, 11B, 11C and 11D are taken and the distances from the center O are a, b, c and d, respectively, a>b>c>
It is formed so as to satisfy the relationship of d. And joint part J
As shown in FIG. 4B, when the points 2E, 12F, 12G, and 12H are sequentially taken from the upper surface 10A to the lower surface 10B in the thickness direction of the airbag door 10, the number 2 is from the center O. The distances e, f, g, and h to each point satisfy e <f <g <h. Further, the joint portion J3 has points 13P, 13Q, 13 from the upper surface 10A side to the lower surface 10B side of the airbag door 10.
Distances p, q, from R, 13S to the center of the rotary shaft 25
The shape is such that r and s are p <q <r <s. The contact portions J1, J2, J3 may be linear or curved.

By making the contact state between the airbag door 10 and the passenger compartment side member 30 as described above, the airbag door 10 is expanded by the expansion of the airbag, as will be better understood from FIG. When the airbag door 10 is deployed and opened, the airbag door 10 can be smoothly released from the rotation shaft portion 25 without hitting the opening edge portion of the vehicle interior side member 30. Further, since the airbag door 10 is joined to the opening edge of the passenger compartment member 30, not only is there no gap between the two, but the mounting accuracy is good, and the product appearance is also excellent. . Further, since the rotary shaft portion 25 of the airbag door 10 is embedded in the vehicle interior side member 30, it is possible to simplify the steps such as attaching the airbag door to the airbag case with a hinge.

5 and 7 show an example of manufacturing the airbag door structure of the present invention. First, as shown in FIG. 5, the synthetic resin material 42 is introduced into the cavity 41 of the mold 40 to form the airbag door 10 having a predetermined shape. In advance, a metal round bar serving as the rotary shaft portion 25 is arranged in the mold 40. Then, as shown in FIG.
In the lower mold 46 of the mold 45 for the passenger compartment member 30,
The airbag door 10 obtained in the above step is arranged at the position where the airbag deployment opening is formed. Then, as shown in FIG. 7, the upper mold 47 closes the mold,
Synthetic resin material 4 forming a member on the passenger compartment side in the cavity 48
Introduce 3.

As described above, the synthetic resin material 42 constituting the airbag door 10 is different from the synthetic resin material 43 constituting the vehicle interior side member and is not compatible with each other, and is higher than the synthetic resin material 43. Since it has a softening temperature,
Even when the airbag door 10 preformed in this way is arranged as an insert to form the passenger compartment-side member 30, the airbag door 10 is surely integrally formed without softening at the forming temperature of the synthetic resin material 43. be able to. Further, since the airbag door is not firmly joined to the member on the vehicle compartment side, the airbag door can be released promptly and reliably. As a method of obtaining the airbag door structure of the present invention, a known so-called double injection molding in which the airbag door and the passenger compartment member are molded by the same molding machine can be used.

The vehicle interior side member provided with the above structure can be used as it is as a vehicle instrument panel if its surface is painted in a predetermined color by soft touch paint. Also, a soft vinyl chloride may be injection-molded on the surface of the member on the vehicle compartment side to provide a skin. Further, it is possible to form a skin material in which a surface layer made of vinyl chloride and a back surface layer made of urethane foam are laminated in advance and adhere it to the surface of the passenger compartment member.

Further, as shown in FIG. 8, the structure of the present invention can be applied to the base material of the passenger compartment member. The base material is placed in a foaming mold in which an appropriate skin material is placed, and the skin material and the base material are integrally molded by a foam. In the figure, reference numeral 50 is a base material, 51 is an airbag deployment opening portion, 5
2 is an airbag door, 53 is a rotating shaft portion, 54 is a skin material,
55 is a foam and 56 is an airbag case.

[0025]

As shown and described above, according to the structure of the air bag door for an automobile of the present invention, the air bag door and the member on the passenger compartment side are further integrally molded to form a joint structure. As a result, the gap between the two does not appear, and the boundary line between the airbag door and the airbag deployment opening of the vehicle interior side member is not conspicuous on the surface and is extremely excellent in appearance. Further, according to the present invention, by embedding the rotary shaft portion, which is hung over the notch in the rear portion of the airbag door, integrally with the vehicle compartment side member, the conventional door hinge is eliminated,
Therefore, the mounting process of the airbag door can be simplified.

[Brief description of drawings]

FIG. 1 is a plan view of an airbag deployment opening of a vehicle interior side member showing an example of the structure of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a perspective view of an airbag door.

FIG. 4 is a sectional view showing a main part of the structure of the present invention.

FIG. 5 is a cross-sectional view of a molding die for manufacturing an automobile airbag door of the present invention.

FIG. 6 is a cross-sectional view of a mold showing a state in which a passenger compartment member is manufactured using the obtained airbag door.

FIG. 7 is a cross-sectional view showing a molded state.

FIG. 8 is a sectional view showing another example of the present invention structure.

FIG. 9 is a perspective view showing an example of a vehicle interior side member.

FIG. 10 is a sectional view thereof.

[Explanation of symbols]

 10 Airbag Door 11 Front End Part 12 Notch Part Front End Part 13 Notch Part Rear End Part 15 Notch Part 25 Rotating Shaft Part 30 Cabin Side Member 32 Opening Front Edge Part 33 Opening Rear Edge Part 35 Airbag Deployment Opening Part J1 Joint Part J2 joint part J3 joint part

Claims (3)

[Claims] 1. An airbag door formed in contact with an opening edge portion of an airbag deployment opening formed in a passenger compartment member, wherein a rotary shaft portion is stretched around a rear portion of the airbag door. A cutout portion is provided, and the rotation shaft portion is embedded in the vehicle interior side member by the vehicle interior side member entering the cutout portion, and the front end portion of the airbag door and the interior vehicle side member Of the opening front edge of the door is configured such that the distance from the rotating shaft portion becomes shorter from the door upper surface side to the door lower surface side, and the notch front end portion of the airbag door and the passenger compartment side member are joined together. The contact portion is configured such that the distance from the rotating shaft portion is increased from the upper surface side to the lower surface side of the door, and the joint portion between the rear end portion of the airbag door and the rear edge portion of the opening of the passenger compartment side member is the door. The distance from the rotating shaft is long from the top side to the bottom side. Structure of the air bag door vehicle, characterized in that it is configured so that. 2. The automobile airbag according to claim 1, wherein the airbag door is made of a synthetic resin material which is different from the vehicle interior side member and incompatible with each other, and has a higher softening temperature than the vehicle interior side member. Door structure. 3. The structure of an automobile airbag door according to claim 1, wherein a plurality of cutouts are formed in a rear portion of the airbag door.