Resin-Made Impact Absorption Member and Vehicular Component

Patent metadata

Field	Value
Publication number	US-2016356334-A1
Application number	US-201515116582-A
Country	US
Kind code	A1
Filing date	Feb 5, 2015
Priority date	Feb 6, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

Provided is a resin-made impact absorption member including: an impact absorption portion which includes a fiber-reinforced resin material containing reinforcing fibers and a thermoplastic resin and has a hollow structure including an outer cylindrical portion and a hollow portion, in which the reinforcing fiber has an average fiber length of 1 mm to 100 mm, the thermoplastic resin has a fracture elongation of 10% or more, the fiber-reinforced resin material has a compressive elastic modulus of 10 GPa or more and a compressive strength of 150 MPa to 500 MPa, and in the impact absorption portion, a maximum value of a ratio L 1 /t 1 of a distance L 1 from a position of the center of gravity to the outer cylindrical portion on a same section in a sectional shape in a direction orthogonal to an impact absorption direction, to a thickness t 1 of the outer cylindrical portion, is 40 or less.

First claim

1 . A resin-made impact absorption member comprising:
an impact absorption portion which includes a fiber-reinforced resin material containing reinforcing fibers and a thermoplastic resin and which has a hollow structure including an outer cylindrical portion and a hollow portion, wherein the reinforcing fiber has an average fiber length of 1 mm to 100 mm, the thermoplastic resin has a fracture elongation of equal to or greater than 10%, the fiber-reinforced resin material has a compressive elastic modulus of equal to or greater than 10 GPa and a compressive strength of 150 MPa to 500 MPa, and wherein, in the impact absorption portion, a maximum value of a ratio L 1 /t 1 of a distance L 1 from a position of the center of gravity to the outer cylindrical portion on a same section in a sectional shape in a direction orthogonal to an impact absorption direction, to a thickness t 1 of the outer cylindrical portion, is equal to or less than 40.

2 . The resin-made impact absorption member according to claim 1 ,
wherein the sectional shape in the direction orthogonal to the impact absorption direction of the impact absorption portion is a polygon, and a maximum value of a ratio L 2 /t 2 between a side length L 2 on each side of the polygon and an average thickness t 2 of the outer cylindrical portion which configures the side, is equal to or less than 40.

3 . The resin-made impact absorption member according to claim 1 ,
wherein the impact absorption portion is configured by combining hat shapes having flange portions.

4 . The resin-made impact absorption member according to claim 1 ,
wherein the sectional shape in the direction orthogonal to the impact absorption direction of the impact absorption portion is a uniform shape across the entire impact absorption direction.

5 . The resin-made impact absorption member according to claim 1 ,
wherein the impact absorption portion includes a single fiber-reinforced resin material.

6 . The resin-made impact absorption member according to claim 1 ,
wherein the impact absorption portion includes the fiber-reinforced resin material, and is constituted by an impact absorption base material having a substantially constant thickness, and wherein the impact absorption base material includes a plurality of thermoplastic resin base materials combined in the impact absorption direction, the thermoplastic resin base materials having different compressive strengths.

7 . The resin-made impact absorption member according to claim 6 ,
wherein, in the impact absorption base material, the plurality of thermoplastic resin base materials are disposed in order of increasing the compressive strength toward a rear end side from a tip end side which receives the impact.

8 . The resin-made impact absorption member according to claim 6 ,
wherein the compressive strengths of the plurality of thermoplastic resin base materials are different as volume fractions of the reinforcing fiber are different from each other.

9 . The resin-made impact absorption member according to claim 6 ,
wherein, in the impact absorption base material, adjacent thermoplastic resin base materials are combined so that abundance continuously changes in a thickness direction in a boundary of the adjacent thermoplastic resin base materials.

10 . The resin-made impact absorption member according to claim 1 ,
wherein, in the impact absorption portion, a plurality of resin shaped products which have flange portions and include the fiber-reinforced resin material, are combined to form a boundary portion as the flange portions come into contact with each other, and wherein an impact absorption auxiliary portion which includes a resin material formed to cover the boundary portion, is further provided.

11 . The resin-made impact absorption member according to claim 10 ,
wherein a sectional area of the impact absorption auxiliary portion in the direction perpendicular to the impact absorption direction of the impact absorption portion, is different from a sectional area in the impact absorption direction.

12 . The resin-made impact absorption member according to claim 11 ,
wherein the impact absorption auxiliary portion is formed so that the sectional area increases along the impact absorption direction.

13 . The resin-made impact absorption member according to claim 10 ,
wherein the boundary portion is covered with the impact absorption auxiliary portion so as to have a space between an end surface of the boundary portion and an inner surface of the impact absorption auxiliary portion, at least at a part thereof.

14 . The resin-made impact absorption member according to claim 10 ,
wherein the flange portions which form the boundary portion are joined to each other.

15 . A vehicular component comprising a resin-made impact absorption member according to claim 1 .

Assignees

• Teijin Ltd

Inventors

• Onoue Shuhei
• Yamaji Tadashi
• Yokoyama Keizo
• Oka Kohei

Classifications

• B60R19/03

  characterised by material, e.g. composite (B60R19/18 takes precedence) · CPC title

• B62D25/04

  Door pillars {; windshield pillars} · CPC title

• B62D29/04

  predominantly of synthetic material (working of plastics or substances in a plastic state B29) · CPC title

• B62D21/152

  Front or rear frames · CPC title

• B60R19/34

  destroyed upon impact, e.g. one-shot type · CPC title