JPH0211749U

JPH0211749U -

Info

Publication number: JPH0211749U
Application number: JP8995588U
Authority: JP
Priority date: 1988-07-08
Filing date: 1988-07-08
Publication date: 1990-01-25
Anticipated expiration: 2003-05-10
Also published as: JPH0517327Y2

Description

[Brief explanation of drawings]

第１図ａは高密度発泡体の斜視図であり、第１
図ｂおよび第１図ｃは、本考案のバンパー芯材の
一例を示す斜視図である。図において、Ａは高密
度発泡体Ａを示し、Ｂは低密度発泡体Ｂを示す。
第２図は、バンパー芯材の一例の平面図である。
図において、Ａ―Ａ′線は、実質受圧面を示す。
第３図は、バンパー芯材の他の例の平面図である
。図において、Ａ_１―Ａ_１′およびＡ_２―Ａ_２′
は実質受圧面を示す。第４図は、バンパー芯材に
おける応力―歪み曲線の例を示す。第５図は、バ
ンパー芯材における応力―歪み曲線の好ましい例
を示す。第６図ａ，ｂおよびｃは、衝突時にバン
パー芯材に負荷のかかる態様を示す。第７図は、
本考案の試験に使用したバンパー芯材の形状の一
例を示す断面図である。図において、Ａ_１，Ａ_２およびＡ_３は高密度発泡体Ａの各部の厚みを示し
、Ｂ_１，Ｂ_２およびＢ_３は低密度発泡体Ｂの各部
の厚みを示す。 Figure 1a is a perspective view of the high-density foam;
FIG. 1B and FIG. 1C are perspective views showing an example of the bumper core material of the present invention. In the figure, A indicates high-density foam A, and B indicates low-density foam B.
FIG. 2 is a plan view of an example of a bumper core material.
In the figure, the line AA' indicates the actual pressure receiving surface.
FIG. 3 is a plan view of another example of the bumper core material. In the figure, A ₁ - A ₁ ' and A ₂ - _{A 2} '
indicates the actual pressure receiving surface. FIG. 4 shows an example of a stress-strain curve in a bumper core material. FIG. 5 shows a preferred example of the stress-strain curve in the bumper core material. Figures 6a, b and c show how the bumper core material is loaded with load during a collision. Figure 7 shows
It is a sectional view showing an example of the shape of the bumper core material used in the test of the present invention. In the figure, A ₁ , A ₂ and A ₃ indicate the thickness of each part of the high-density foam A, and B ₁ , B ₂ and B ₃ indicate the thickness of each part of the low-density foam B.

Claims

[Claims for Utility Model Registration] (1) High-density foam A with a density of 0.030 to 0.100 g/cm ³ and a density of 0.015 to 0.08 g/cm 3
cm ³ low-density foam B, and the difference in density between foam A and foam B is 0.01 g/cm ³ or more, combining two types of propylene polymer foams with different densities. This is a core material for an automobile bumper, in which the high-density foam A is dispersed in at least two places, and when set as a bumper core material, at least one piece is in the upper half of the center line and one piece is in the lower half. A core material for an automobile bumper, which is arranged in halves and has a structure in which these high-density foams A are interconnected. (2) The core material for an automobile bumper according to claim 1 of the utility model registration claim, wherein the ratio of the impact pressure receiving area of the high-density foam A to the impact pressure receiving area at the tip of the bumper core material is 10 to 50%. .