JP2593084Y2 - Side-trim structure for door trim base material - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for a side collision of a door trim base material capable of absorbing the impact of a side collision in a vehicle.

[0002]

2. Description of the Related Art Usually, a door trim base material 2 by injection molding.
1 is a convex portion 21a, 21b which is partially inward of the vehicle from the viewpoint of interior design or a functional viewpoint such as an armrest.
(See FIG. 4). However, on the other hand, if such a convex portion 21a, 21b receives an impact from the lateral outside of the vehicle, there is a possibility that objects inside the vehicle may be damaged.

For this reason, as shown in FIG.
A side impact absorbing pad 23 made of hard urethane or the like is bonded to the door panels 22a and 21b.
As a result, the impact from the outside of the vehicle is absorbed and buffered by the pad 23, and the influence on the inside of the vehicle can be reduced.

[0004]

However, attaching the pad 23 separately to the integrally molded door trim base member 21 adds one step to the manufacturing process of the door trim base member 21, so that the process time is extended. Will be. Further, if the curing time of the hot melt adhesive used for bonding the pad 23 is short, the bonding between the pad 23 and the door trim base material 21 tends to be insufficient. In some cases, defects such as peeling off of 23 may occur. Therefore, an object of the present invention is to provide a side-collision structure for a door trim base material that can reliably provide an impact absorbing structure without lowering production efficiency.

[0005]

According to the present invention, as a technical means for solving the above problems, in a door trim base material having a convex portion inside a vehicle by injection molding, a door trim base material is provided. On the door panel side, a means corresponding to a side-collision structure of a door trim base material configured to seal an injection gas injected at the time of injection molding and bulge and form a hollow impact buffering chamber.

[0006]

With the above construction, the impact of the side collision can be absorbed and buffered by the injection gas sealed in the impact buffer chamber integrally formed with the door trim base material. The shock absorbing chamber is integrally formed at the same time when the door trim base material is formed, is filled with an injection gas and has a structure, and there is no additional work process.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a sectional structure of a door trim base material 1 of the present invention, and FIG. 2 shows a perspective view. As apparent from FIG. 2, the door trim base 1
Is formed by injection molding using a thermoplastic resin, and has the same appearance as that of a conventional resin. That is, the upper edge convex portion 4 and the armrest convex portion 5 and the like of the door trim base material 1 are integrally formed mainly in a convex shape inside the vehicle.

In the convex portions 4 and 5 of the door trim base material 1 formed in this way, inner walls 9a and 9b are formed on the door panel 15 side at portions which need to correspond to the most side collisions. (See the dotted line in FIG. 2). These inner walls 9a, 9b
FIG. 1 shows a cross-sectional structure of a portion where is formed. The right side of FIG. 1 shows the inside of the vehicle.

First, on the door panel 15 side of the upper edge convex portion 4 of the door trim base material 1, a hollow upper shock absorbing chamber filled with injection gas by the inner wall 9a and the inside of the upper edge convex portion 4. 6 are formed. The shock absorbing chamber 6 extends over the dotted line (upper part) in FIG.
5 is provided along the concave shape of the upper edge convex portion 4. The buffer chamber 6 is formed integrally with and simultaneously with the door trim base material 1 by injection molding, and has a substantially rectangular cross section.
It is formed so as to protrude into the space between the upper edge convex portion 4 and the door panel 15.

Further, a hollow lower shock absorbing chamber 7 is also provided on the door panel 15 side of the armrest convex portion 5 so as to protrude toward the door panel 15 by the inner wall 9b and the inside of the armrest convex portion 5. Like the upper part, the lower shock absorbing chamber 7 has a substantially rectangular cross section by injection molding and is formed at a predetermined height along the upper end side of the armrest convex part 5.

The vertical shock absorbing chamber 6 thus formed,
Numeral 7 is connected through a gas injection passage 10 shown in FIG. 2, and an injection gas at the time of injection molding is injected and sealed. The injection gas is a gas used at the time of injection molding, for example, an inert gas such as carbon dioxide gas or nitrogen gas, and is injected into the upper and lower shock buffer chambers 6 and 7 by a gas injection method by a gas inflow structure shown in FIG. , Will be filled.

The gas injection method is a method of molding a molded product by injecting a gas into a molten resin injected during injection molding of a thermoplastic resin. In such a gas injection method, an injection gas is injected into the molten resin as described below, so that
And the inner walls 9a, 9b form impact buffer chambers 6,7.

That is, the molding of the upper and lower impact buffer chambers 6 and 7 and the filling of the injection gas are performed as follows. First, a predetermined amount of measured injection gas is injected by a nozzle or the like from an injection gate 8 located at a position corresponding to the upper edge of the door trim base material 1 into the molten resin filled at the time of injection molding in an injection molding die. . The injected injection gas is shown in FIG.
As shown in FIG.
Is injected into the entire interior of the molten resin through a pipe-shaped gas injection passage 10 formed along the shape of the door trim base material 1 so that the molten resin is hollow.

At the same time, the upper and lower shock absorbing chambers 6 and 7 are formed by the molten resin along the mold. Thereafter, the injection gate 8 is sealed by welding or the like, and the injected injection gas is sealed in the shock buffer chambers 6 and 7.

The injection gas measured and injected as described above is held in the shock absorbing chambers 6 and 7 at a predetermined pressure without leaking to the outside.

Next, the operation of the door trim base material 1 thus formed at the time of side collision will be described. When an impact is received from the side of the vehicle, that is, the door panel 15 side, the impact force is transmitted to the inside of the vehicle by the dent of the door panel 15. This force is transmitted to the upper and lower shock buffer chambers 6 and 7 depending on the location where the shock is received, and the pressurized injection gas in the buffer chambers 6 and 7 serves as a cushion to disperse and absorb the shock force. That is, instead of the hollow structure consisting of the simple shock buffer chambers 6 and 7, the chamber is filled with a predetermined amount of injection gas, and the internal injection gas is deformed as the buffer chambers 6 and 7 are deformed. Then, in each of the buffer chambers 6 and 7, the strain is dispersed in the other buffer chambers 6 and 7 via the gas injection passage 10. As a result, the shock can be received by the entire buffer chambers 6 and 7, so that the shock can be sufficiently absorbed and the influence on the inside of the vehicle can be reduced.

As a result, the convex portion 4 of the door trim substrate 1
5 does not protrude inwardly of the vehicle in response to the dent of the door panel 15, and can prevent damage to objects inside. Even if the shock buffer chambers 6 and 7 are destroyed, the injected injection gas is inert, and therefore has no danger of explosion or the like.

Further, since this side collision supporting structure is completed simultaneously with the molding of the door trim base material 1 unlike the conventional one, the process time can be reduced and manual work can be omitted. Because it is done by technology,
Product defects are also reduced.

[0019]

[Effects of the Invention] As described above, according to the present invention,
Inject a predetermined amount of injection gas into the hollow shock buffer chamber on the door panel side of the convex part of the door trim base material by injection molding,
By sealing with a predetermined pressure, the impact at the time of a side collision can be dispersed in the impact buffer chamber and received as a whole. For this reason, the impact force at the time of a side collision can be absorbed without being transmitted to the inside of the vehicle as it is, and damage to an object in the vehicle can be prevented. In addition, since it is possible to form this side collision corresponding structure simultaneously with the molding of the door trim base material,
It is possible to reasonably and surely provide the door trim base material with a stable and stable structure for side collision without additional work steps.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross-sectional structure of a door trim base material of the present invention.

FIG. 2 is a perspective view of a door trim base material.

FIG. 3 is a sectional view taken along line AA shown in FIG. 2;

FIG. 4 is a perspective view of a conventional door trim base material.

FIG. 5 is a diagram showing a cross-sectional structure of a conventional door trim base material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Door trim base material 4, 5 ... Convex part 6, 7 ... Impact buffer room 15 ... Door panel

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B60J 5/00 B60R 13/02 B60R 21/02

Claims (1)

(57) [Scope of request for utility model registration] 1. A door trim base member having a convex portion formed on the inside of a vehicle by injection molding, wherein the convex portion has a hollow shape by sealing an injection gas injected during injection molding on a door panel side. Side impact structure of the door trim base material which is configured to bulge the shock absorbing chamber.