JPH06270680A - Automobile door trim - Google Patents

Abstract

PURPOSE:To moderate a shock transmitted to an occupant by adjusting the shock reaction characteristic for resisting against a shock sidewise of a door trim, so as to be soft against a load on an initial stage but to be more or less hard against on a latter half stage. CONSTITUTION:A thin wall part 21 is formed in an injection molded or stamping molded core 20 used in an automobile door trim 10, in an area where the chest part of the passenger strikes upon the core 20, and longitudinally long recessed grooves 22, 23 are also formed in the core 20 in this area A. Cross-points 24 between the grooves 22, 23, from which breakage occurs, are set in the thin wall part, thereby it is possible to set the reaction characteristic which is soft against a shock on an initial stage but to be more or less hard against the shock on the latter half stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile door trim, and more particularly to an automobile door trim for enhancing impact absorbing performance in a waist portion when an impact is applied from the side of the vehicle such as a side collision. .

[0002]

2. Description of the Related Art Conventionally, a door trim is installed on the interior side of a door panel for the purpose of enhancing the aesthetics of the room and protecting an occupant from an impact applied to a vehicle body.

The general structure of an automobile door trim and the structure for attaching it to a door panel will be described with reference to FIGS.

First, the door trim 1 is often molded into a curved surface in terms of molding, and the surface of a core material 2 made of a resin molding molded into a required shape by injection molding or stamping molding is provided with cushioning properties. An excellent skin material 3 is attached, and stopper ribs 5 for strengthening rigidity are integrally provided on the back surface of the waist portion 4 when the core material 2 is molded.

The stopper ribs 5 are formed on the back surface of the core member 2 at appropriate intervals along the longitudinal direction of the vehicle, and come into contact with the door inner panel 6 to have a position regulating function in the waist portion 4 of the door trim 1. I have it.

By the way, usually, in order to maintain the shape retention of the door trim 1, the thickness of the core 2 is 2.0 to 2.5 mm, and the stopper rib 5 having a reinforcing function is provided on the back surface of the waist 4 of the core 2. Therefore, the rigidity of the waist portion 4 of the door trim 1 is extremely strong.

Therefore, as shown in the graph of FIG.
The amount of displacement in the waist portion 4 of the door trim 1 is small with respect to the impact load from the side, and as a countermeasure against this, an attempt is made to reduce the rigidity of the waist portion 4, for example, by setting a thin plate thickness of the waist portion 4 or A method has been proposed in which a groove is set so that the portion 4 is easily broken.

[0008]

However, in the occupant's chest at the time of a side collision, the mechanism is such that the rock bones, the inside of the chest, and then the spine are sequentially impacted at the initial stage, and the reaction force against the impact of the door trim 1 is generated. As a characteristic,
Although it is required to have characteristics such as softness at the initial stage of impact and hardness against continuous impact, the core material 2 in the conventional waist portion 4 is merely a measure for weakening the rigidity, so that it is resistant to impact applied to the vehicle such as a side impact. On the other hand, the ideal reaction force characteristic of the door trim 1 could not be sufficiently satisfied.

The present invention has been made in view of the above circumstances, and the vehicle door trim is designed so that the waist portion of the door trim is provided with a shock absorbing characteristic that is soft at the initial impact and is slightly hardened at the continuous impact. Is intended to provide.

[0010]

In order to achieve the above object, the present invention provides a core material formed by injection molding or stamping molding into a desired curved surface shape, or a skin material integrally attached to the surface of the core material. In an automobile door trim that is configured by wearing the inner door panel, the core material in the impact area where the chest of the occupant collides at the time of a side collision has a thin wall portion, and the core material is flexible. While the groove is provided in the vertical and horizontal directions, the intersection of the both grooves is set to the thin portion which becomes the starting point of fracture.

[0011]

As apparent from the above construction, the core material in the impact area where the chest of the occupant collides at the time of a side collision, the core material is set to be thin and the grooves are installed in the vertical and horizontal directions. Upon impact, the reaction force of the door trim becomes soft due to the flexibility of the core material.

Furthermore, since the intersection of the vertical and horizontal concave grooves formed in the core material in this impact area is set as thin as possible to be the starting point of fracture, the fracture is likely to occur, and the impact load when the fracture occurs Control is also easy.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a vehicle door trim according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing an embodiment of an automobile door trim according to the present invention, and FIG. 2 is a sectional view showing a state in which the automobile door trim is attached to a door inner panel.
FIG. 4 is a perspective view of a main part showing a configuration of a waist portion of a core material in the vehicle door trim, and FIG. 4 is a graph showing impact absorption performance in the waist portion of the vehicle door trim.

Referring to FIGS. 1 and 2, a vehicle door trim 10 according to the present invention has a core made of a resin molded body formed into a required shape by injection molding or stamping molding of a synthetic resin such as ABS resin and PP resin. Material 20
The surface of the PVC sheet is covered with a skin material 30 having a good cushioning property such as a laminated sheet obtained by lining a cushion layer such as polyethylene foam on the back surface of the PVC sheet.

Then, the vehicle door trim 10 is mounted on the interior side of the door inner panel 40 via a fixing means such as a clip (not shown).

By the way, the feature of the present invention resides in that when a side impact such as a side collision is applied to the vehicle, the impact on the occupant is reduced.

That is, as shown in FIG. 3, when an impact from the side such as a side impact is applied, an impact area (a portion indicated by A partitioned by a dotted line in FIG. 1) where the chest of the occupant collides is set. , (1) ~ in this impact area A
The configuration of (5) is adopted. (1) The thin portion 21 having a thickness of 1.0 to 1.2 mm is set (the plate thickness of the core material 20 in the general portion is 2.0 to 2.5 mm). (2) The concave groove 22 is set in the vertical direction. (3) The groove 23 is set in the lateral direction. (4) The intersection 24 of the grooves 22 and 23 in the vertical and horizontal directions is further thinned so as to be the starting point of fracture. (5) The V-shaped notch 26 is set in the waist flange portion 25 on the extension of the concave groove 22 in the vertical direction.

As described above, in the vehicle door trim 10 according to the present invention, in the impact area A of the occupant's chest, the thin portion 21 is set in the core member 20 and the lateral recessed groove 23 allows, for example, the occupant's chest. When it hits the door trim 10 with a relatively small impact, the core material 20 is easily bent by the thin portion 21 and the lateral groove 23, and a relatively small impact load can be effectively absorbed, and a soft feeling can be obtained. To be

Further, since the vertical and horizontal concave grooves 22 and 23 are set and the intersection 24 of both concave grooves 22 and 23 is set to a thin portion, the impact load concentrates on the intersection 24 with respect to the continuous impact load. The core material 20 in the impact area A
By breaking, the impact on the chest of the occupant can be alleviated.

This will be described with reference to the graph of FIG. First, sample No. 1 to No. 4 are created in the following procedure. Sample No. 1; Structures (1), (3) and (5) adopted, indicated by the solid line in the graph. Sample No. 2; Composition (2) (3) (4) (5) adopted,
It is shown by a two-dot chain line in the graph. Sample No. 3; Structures (3) and (5) adopted, indicated by dotted lines in the graph. Sample No. 4; Configurations (1) to (5) adopted, in the graph,
It is indicated by a one-dot chain line. For comparison, the unmeasured items are shown for reference.

As is apparent from the graph of FIG. 4, the effects of the configurations (1) and (2) are large in the initial stage of impact, and the impact absorption in the latter half of the period when the configurations (3) and (4) continue. Is clearly effective in the sample
It can be easily understood that sample No. 4 including all of the configurations (1) to (5) exhibits characteristics closer to the ideal energy absorption characteristics as compared with Nos. 1 to 3.

[0023]

As described above, the vehicle door trim according to the present invention has the following special operational effects.

(1) In the door trim, an impact area where the chest of an occupant collides at the time of a side collision is set, and the core material corresponding to this impact area is set to a thin portion and concave grooves are formed in the vertical and horizontal directions. By giving flexibility to the waist portion, and by making the intersection of these two concave grooves a thin portion so as to be the starting point of the breakage, it is easy to cause the waist portion to break, and the impact due to the breakage of the waist portion It is to absorb effectively.

Therefore, there is an effect that the reaction force of the door trim which is soft in the initial stage of the impact and slightly hardened in the latter half of the impact can be adjusted.

(2) If the core material in the impact area where the occupant's chest collides, such as during a side impact, is organically combined with a thin-walled portion, vertical and horizontal concave grooves, and thinning settings at the intersections of the concave grooves, the impact load Can be effectively controlled, and fine impact countermeasures can be taken.

(3) Since the core material corresponding to the impact area of the chest of the occupant is set to be thin, and the concave groove along the longitudinal and lateral directions and the intersection of both concave grooves are formed in the thin portion, the injection is performed. When molding the core material by molding or stamping molding, the thin-walled portion or the groove can be molded at the same time, so that it is easy to take measures by simply performing a simple process on the mold, which is of high practical value.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an automobile door trim according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a partially cutaway perspective view showing a configuration of a main part of a waist portion of a vehicle door trim according to the present invention.

FIG. 4 is a graph showing the impact absorption characteristics of a vehicle door trim according to the present invention.

FIG. 5 is a front view showing a conventional automobile door trim.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a graph showing impact absorption characteristics of a waist portion of a conventional automobile door trim.

[Explanation of symbols]

 10 Automotive Door Trim 20 Core Material 21 Thin-walled Part 22, 23 Recessed Groove 24 Intersection 25 Waist Flange 26 V Notch 30 Skin Material 40 Door Inner Panel

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuhiko Takahashi 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (1)

[Claims] 1. A door formed by injection molding or stamping molding to form a core material (20) alone into a required curved surface shape, or by integrally adhering a skin material (30) to the surface of the core material (20). In an automobile door trim mounted on the inner side of the inner panel (40), an impact area (A) where a passenger's chest collides during a side collision
In the core material (20) in (1), a thin portion (21) is set, and flexibility is imparted to the core material (20).
The vehicle door trim is characterized in that the recessed grooves (22, 23) are installed in the vertical and horizontal directions, while the intersection (24) of the both recessed grooves (22, 23) is set to a thin portion serving as a starting point of breakage. .