JPS6229459A - Shock absorbing body for interior finish of automobile - Google Patents

Abstract

PURPOSE:To provide sufficient shock absorbing capacity even through a light compact structure by disposing a plurality of walls made of hard resin between at least three parallel thin plates made of hard resin to define and form a plurality of cells 3. CONSTITUTION:Between at least three parallel thin plates 1 made of hard resin are disposed a plurality of walls 2 made of hard resin to define a plurality of cells for constituting a shock absorbing body A. Then thermoplastic resin capable of different type extrusion for producing the shock absorbing body A is preferably used for the hard resin. Also, the gaps between adjacent thin plates 1 and opposed walls 2 are preferably 3-25mm for example. Further, the number of thin plates 1 is preferably three or more, i.e. a multi-stage construction having at least two stages is preferable. Thus, sufficient shock absorbing capacity can be provided by a relatively small stroke width with light weight.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a @Hayabusa absorbent body for automobile interiors, and more particularly to a knee bolster shock absorber for use in areas where the knee hits during a car collision to reduce injuries. Regarding absorbers.

[Prior art]

For automobiles, especially passenger cars, F'MVSS is a method for protecting drivers and passengers from impact in the event of a collision.
201, regulations stipulate that a person's head should not hit the instrument panel with cracks or cracks that would injure the instrument panel in the Head Form Impact Test.

I'm worried. In addition, if the seat belt is a two-point belt, the head will not hit the instrument panel, but there is a risk of injury if the knee hits the steel plate that separates the passenger compartment from the engine compartment. Therefore, there is a need for safety standards regarding this knee impact.

Knee bolsters currently in use are made of steel and weigh more than 9 out of 10.

[Problems to be solved by the present invention]

The present invention provides a shock absorber for automobile interiors that can sufficiently protect the knees during a collision and is lightweight. The performance required for a knee bolster is 18
．． The maximum load applied to the center of impact must not exceed 100Cllc9 when the center of impact has a mass of 2klil and has a hemispherical tip with a diameter of about 10QJ11 and collides at a speed of about 6.91n/8.

[Structure of the invention]

The present invention provides a shock absorber for automobile interiors having a multi-stage structure in which a number of small chambers formed by a number of walls made of hard resin are connected to each of three or more mutually parallel thin plates made of hard resin. Provide your body.

1 to 4 are enlarged diagrams of the shock absorber of the present invention.

For simplicity, only a two-stage structure is shown.

In the present invention, a large number of walls may be arranged parallel to each other in one direction to form a large number of elongated chambers, as shown in FIG. As shown in FIG. 2, the direction of the wall in the first stage and that in the second stage may be at right angles to each other. Alternatively, as shown in Fig. 3, a large number of walls are arranged parallel to each other in one direction, and a large number of other walls are arranged parallel to each other in one direction at substantially right angles to each other, resulting in a small It can be one in which a large number of substantially square chambers are arranged in series.

Alternatively, as shown in FIG. 4, the cross section of the chamber may be honeycomb-shaped. In this case, the structure may be such that there is no wall or a wall that crosses the honeycomb surface in a direction perpendicular to the honeycomb surface.

In the present invention, any conventionally known hard resin can be used as the hard resin. Since profile extrusion is preferred as a method for creating the structure of the present shock absorber, it is convenient to use a thermoplastic resin that can be profile extruded.

Nine examples include polyolefins such as polyethylene and polypropylene, polyamides, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyethers such as polyphenylene ether and modified polyphenylene ether, polycarbonate), ABS
Examples include resin and polyacetal. 4 thin plates and walls
It is also possible to create several unit structures consisting of 44 walls and then stack them one on top of the other.

The distance between adjacent thin plates is 3 to 25 mm, and <VC5
The distance between the opposing walls is preferably 3 to 25 mm, and preferably 5 to 15 mm. If the above upper limit of the spacing between the thin plates and walls is exceeded, it will be difficult to obtain sufficient shock absorption performance in the shock absorber for automobile interiors to be stored in the specified space.6 If the spacing is too small, the maximum load will be 100kg. It exceeds. If the wall thickness is too large, the maximum load will exceed 1000 mm, and if the thickness in one direction is too small, sufficient shock absorption performance will not be obtained. The thickness of the thin plate is usually 0.5 to 2. On, especially 0.5 to 1.5 mm, the wall thickness is usually 0.3 to 2
．． 0 order, preferably 0.5 to 1.5 tax.

In the present invention, the number of thin 7 plates is 3 or more, that is, 2
It is preferable to have a multi-stage structure with more than one stage. Especially, 5~
It is preferable to use 31 thin plates in order to obtain a suitable balance between strength and shock absorbing ability.

〔Effect of the invention〕

The shock absorber for automobile interior of the present invention is lightweight and has sufficient shock absorption capacity with a relatively small stroke width. Moreover, since it is a multi-stage structure with 417 stages, it can be easily adapted to a desired shock absorption capacity by appropriately determining the number of stages. When the impact absorber of the present invention is used, the peak of the load curve at the time of a collision is low and a flat curve can be obtained, which satisfies the requirement of a load of 1ooo/c9 or less required for a knee-high star. can.

〔Example〕

The BA of the present invention will be further explained using an example.

A unit structure was made consisting of two thin plates with a spacing of 6f1 and a wall arranged perpendicularly thereto and parallel to each other with a T/C spacing of 6mm. The thickness of the slats and walls is 0.5''. The dimensions of the thin plate are 100 mg vertically and 4 aamx horizontally. The slats and walls are made of polycarbonate. A polycarbonate double-skin sheet was glued with a multilayer KM adhesive using Trichloride. As shown in Figure 2, the unit structure created in this way was constructed by changing the direction of the walls step by step.
I made a shock absorber by pasting the layers together.

Next, the test method will be explained. An aluminum striking center with a diameter of 10013E is struck against the test object at a speed of 6.9 m/a and stopped at a point 10 osot from the surface. In addition,
This 10011! This distance is assumed to be the distance from the surface of the knee bolster to the steel plate that separates the passenger compartment and engine compartment. Load cell displacement meter (differential transformer) Fi
It can be attached to the center of impact side. The inertial force of the aluminum striking center is expressed by the formula %: Fl: Center of impact (9 load signals measured with a directly connected strain gauge) Fα: Load signal M measured with a strain gauge for acceleration detection (2) Variable low resistance It is canceled by the setting value of the device. For this purpose, I first blank-fired the aluminum impact center at 6.9%/8, adjusted IFB = QK to M, and then hit it on the test object. The displacement and load at that time were recorded in the transient memory, and after the test, the area under the curve was calculated at the same time as the Y was started using the X-Y recorder.

The displacement-load curve obtained for the shock absorber of this example is shown in the attached FIG. 5. According to it, 1001m
A flat load curve was obtained during the displacement, and the maximum load was 680 kg. That is, 100
07G! ? All of the following requirements are satisfied.

[Brief explanation of drawings]

1 to 4 are sketches of examples of the impact body for automobile interior according to the present invention. FIG. 5 is a load/displacement curve, with the vertical axis representing load and the horizontal axis representing displacement.

Claims (7)

[Claims] (1) A multi-tiered automobile interior that has a number of small chambers each formed by a number of walls made of hard resin between three or more mutually parallel thin plates made of hard resin. Shock absorber for use. (2) The shock absorber for an automobile interior according to claim 1, wherein a large number of walls are arranged parallel to each other in one direction. (3) A large number of walls are arranged parallel to each other in one direction, and a large number of other walls are arranged parallel to each other in one direction at substantially right angles, resulting in a large number of approximately square walls. A shock absorber for an automobile interior according to claim 1, having a large number of consecutively arranged small chambers. (4) The shock absorber for an automobile interior according to claim 1, wherein the small chamber has a honeycomb-like cross-sectional shape. (5) The distance between adjacent thin plates is 3 to 25 mm.
A shock absorber for automobile interior according to any one of claims 1 to 4. (6) Claims 1 to 5, wherein the thin plate has a thickness of 0.3 to 2.0 mm, and the wall has a thickness of 0.3 to 2.0 mm.
Shock absorber for automobile interior according to any one of paragraphs. (7) The shock absorber for an automobile interior according to any one of claims 1 to 6, which has at least five thin plates and therefore has a multi-stage structure of at least four stages.