WO2007007753A1

WO2007007753A1 - Shock absorber

Info

Publication number: WO2007007753A1
Application number: PCT/JP2006/313769
Authority: WO
Inventors: Toshio Suzuki; Kazushige Ebe
Original assignee: Bridgestone Corporation
Priority date: 2005-07-12
Filing date: 2006-07-11
Publication date: 2007-01-18
Also published as: JP2007022146A

Abstract

A shock absorber that even when rigid polyurethane foam breaks up, would not be reduced to pieces and that is easy in handling, unfailingly realizing given energy absorption performance. There is provided a shock absorber, integrated together, rigid polyurethane foam (4) and supporter layer (5). As the supporter layer, use is made of a clothlike material, such as split yarn cloth, butter muslin or nonwoven fabric, a meshlike material, such as net or mesh per se, and a linear material, such as wire or string. Even when rigid polyurethane foam breaks up, polyurethane segments would remain joined to each other by means of the supporter layer and would not be reduced to pieces. Thus, even when breakage occurs during delivery, it would be feasible to handle the segments as an integral matter and to carry out mounting on car bodies without any disadvantage. Because rigid polyurethane foam would not scatter in the event of exposure to shock and would position at given location, energy absorption performance as designed would be exerted.

Description

Specification

Shock absorber

Field of Invention

TECHNICAL FIELD [0001] The present invention relates to an impact absorbing material, and more particularly, to a head protecting material for absorbing impact energy applied to an occupant's head in a passenger compartment at the time of a car collision and reducing head injury values. And a suitable shock absorber.

Background of the Invention

In order to protect the occupant's head and the like by absorbing the impact when the occupant's head and the like collide with the interior material (ceiling, etc.) of the occupant when an automobile collision accident occurs. Between the interior material and the vehicle body, an impact absorbing material such as a head protecting material is provided.

[0003] Some of these shock absorbers are made of rigid polyurethane foam (for example, Patent Documents 1 to 4 below). This shock absorbing material made of rigid polyurethane foam has excellent shock absorbing characteristics, and its shock absorbing characteristics are relatively stable against changes in the head dummy (FMH) entry angle, which has less temperature dependence. is doing.

Patent Document 1: Japanese Patent Laid-Open No. 2000-6741

Patent Document 2: JP 2001-163139 A

Patent Document 3: JP 2002-48178

Patent Document 4: WO2003Z037625

Summary of the Invention

[0004] An object of the present invention is to provide an impact-absorbing material that is easy to handle and does not fall apart even if the rigid polyurethane foam is cracked, and that can reliably obtain a predetermined energy absorption characteristic. To do.

[0005] The impact absorbing material of the present invention is an impact absorbing material having an impact receiving surface to which an impact object hits, and has a rigid polyurethane foam and a support layer made of a cloth-like body, mesh-like body or linear body. However, the rigid polyurethane foam and the supporter layer form a body.

Brief Description of Drawings FIG. 1 is a cross-sectional view of a shock absorber according to an embodiment.

FIG. 2 is a cross-sectional view of the shock absorber according to the embodiment.

FIG. 3 is a cross-sectional view of the shock absorber according to the embodiment.

Detailed description

[0007] The impact absorbing material of the present invention is made of a rigid polyurethane foam in which a supporter layer composed of a cloth-like body, a mesh-like body or a linear body is foamed.

In the impact absorbing material of the present invention, since the rigid polyurethane foam and the supporter layer are integrally formed by foaming, the rigid polyurethane foam is connected by the supporter layer even when the rigid polyurethane foam is cracked. The hard polyurethane foam will not fall apart. For this reason, even if the shock absorber breaks during transportation, it can be handled as an integral object, and can be mounted without any trouble in the mounting process to the vehicle body.

[0009] Furthermore, the shock absorbing material is located at a predetermined place without scattering when receiving the shock. For this reason, the rigid polyurethane foam is reliably compressed, and predetermined energy absorption characteristics can be obtained.

[0010] When the support layer is made of a non-impregnated material such as a cocoon riff, the support layer is not impregnated with urethane when foaming the hard polyurethane foam, so that the original properties of the hard polyurethane foam are hardly affected. ,.

Hereinafter, embodiments will be described with reference to the drawings. 1 to 3 are cross-sectional views showing a shock absorber according to an embodiment.

[0012] The shock absorbers 1 and 2 are formed by integrating the rigid polyurethane foam 4 and the supporter layer 5 together.

[0013] The supporter layer may be provided on the impact receiving surface (front surface) side where the impact material 20 such as the human body of the hard polyurethane foam 4 hits as shown in Fig. 1. It is opposite to the impact receiving surface as shown in Fig. 2. It may be provided on the surface (back surface) side, or may be provided between the front surface and the back surface as shown in FIG.

[0014] To produce shock absorbers 1 to 3, the supporter layer 5 is placed in a mold for molding the rigid polyurethane foam 4, the rigid polyurethane foam is foam-molded, and the rigid polyurethane foam 4 is molded. Combine urethane foam 4 and supporter layer 5 together. By removing from the mold, shock absorbers 1 to 3 in which the rigid polyurethane foam 4 and the supporter layer 5 are integrated are obtained. In the case of the shock absorbing material 3 in FIG. 3, a hard polyurethane foam on the front side or the back side is molded, the supporter layer 5 is overlaid thereon, and the remaining hard polyurethane foam 4 is foam-molded and integrated.

[0015] The impact absorbing materials 1 to 3 can be attached to the interior part 10 such as a vehicle body, a head liner or a garnish as a vehicle head protecting material. However, the use of this shock absorber is not limited to head protection materials.

[0016] The rigid polyurethane foam has a 50% compressive stress of 2.5 kgfZcm ² (about 0.25 MPa) or more, particularly 2.5 to 20 kgf / cm ² (about 0.25 to ² MPa), particularly 2.5 to 16 kgf / Preferably it is cm ² (about 0.25-1. 6 MPa). Further, it is preferable that the density of the rigid polyurethane foam 40 ~200kgZm ^3, in particular 40~140kgZm ^3.

[0017] When the shock absorbing material of the present invention is a head protecting material, the thickness of the shock absorbing material is 5 to: L00mm, especially 10 to 40mm, especially 20 to 30mm in order to be inserted into a limited space on the ceiling. I prefer to be there. If the thickness of the main body is less than 10 mm, the stroke is too short to obtain sufficient shock absorbing performance, and if it exceeds 80 mm, the shock absorbing material becomes bulky. In the present invention, a good shock absorbing performance can be obtained even when a thin body of about 25 mm or less is used.

[0018] As the supporter layer, cloth-like bodies such as cocoon riffs, chillers or nonwoven fabrics, mesh-like bodies such as nets and meshes, and linear bodies such as wires and strings are used.

[0019] As a material for the nonwoven fabric, polypropylene, polyethylene, vinylon, and the like are suitable.

[0020] When the supporter layer is a cloth-like body, the thickness of the cloth-like body is 0.08 to 3. Omm, especially 0.08 to L

About 5 mm is preferable. The fabric supporter layer should have multiple holes in the thickness direction.

[0021] When the supporter layer is a net or mesh, the opening is preferably about 1 to LOmm. The shape of the opening of the net or mesh may be any of a square, a hexagon and the like. As the material for the net and mesh, synthetic resin, fiber and the like are suitable. The diameter of the wire constituting the support layer made of a net or mesh is preferably about 0.1 to 1. Omm. [0022] The supporter layer made of a cloth-like body or a mesh-like body may be a single piece having substantially the same size as the rigid polyurethane foam 4 or may be divided into a plurality of pieces. For example, the supporter layer may consist of a combination of strips.

[0023] When the supporter layer is made of a wire or string-like wire, the material is preferably SWB (hard steel wire), SWR (soft steel wire), SUS (stainless steel wire), BSW (brass wire), etc. The wire diameter is preferably about 1 to 2 mm.

[0024] It is desirable that the string-like body is continuously distributed to the one end side force of the rigid polyurethane foam to the other end side.

[0025] When a supporter layer made of a linear body is provided, it is preferable that a plurality of linear bodies are crossed in a cross beam shape and distributed in two directions. In this case, it is preferable that the linear bodies in the same direction are parallel and the interval between adjacent linear bodies is about 3 to 20 mm.

[0026] The supporter layer 5 is provided on any one of the front surface, the back surface, and between them in FIGS. 1 to 3, but may be provided on two or more of them. Two or more supporter layers 5 may be provided between the front surface and the back surface of the hard polyurethane foam 4.

[0027] When the supporter layer is provided on the front surface or the back surface of the rigid polyurethane foam, it is preferable that the support layer is provided on substantially the entire front surface or the back surface. When the supporter layer is provided between the front surface and the back surface, the supporter layer is preferably provided substantially parallel to the front surface or the back surface. In this case, the size of the supporter layer is a hard layer including the supporter layer. It is preferable that the entire polyurethane foam cross-section.

[0028] In the impact absorbing material in which the supporter layer is integrally formed with the hard polyurethane foam in this way, even if the hard polyurethane foam is cracked, urethane is not connected and separated by the supporter layer. Even if it breaks in the middle, it can be handled as an integrated object. In addition, the mounting operation can be performed on the vehicle body without any trouble.

[0029] Further, since the rigid polyurethane foam is located at a predetermined place without being scattered at the time of impact, the energy absorption characteristics as designed are exhibited.

[0030] When the supporter layer is made of a mesh-like body or a linear body, an effect of reinforcing the rigid polyurethane foam is also exhibited.

[0031] When the supporter layer is a non-impregnated material such as cocoon riff, it has an influence on the original properties of urethane. There is little to get. When a supporter layer made of an impregnating material is used, an impregnated hardened layer is formed, which may change the characteristics of the energy absorbing material. Using this property, it is possible to obtain energy absorption performance that is different from that of rigid urethane alone.

[0032] In order to reflect the characteristics of the rigid polyurethane foam in the shock absorbing material, it is desirable to dispose a sabotage layer on the back side as shown in FIG.

[0033] When the supporter layer is arranged on the surface side as shown in FIG. 2, the supporter layer first receives the impact object 20, and thus the energy absorption characteristics can be changed.

[0034] As shown in Fig. 3, if the supporter layer is arranged in the intermediate layer of the energy absorber or a plurality of supporter layers are provided, in addition to preventing the original cracking and scattering, depending on the purpose. It is also possible to change the energy absorption characteristics.

[0035] Although the invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention.

This application is based on a Japanese patent application filed on July 12, 2005 (Japanese Patent Application No. 2005-0303240), which is incorporated by reference in its entirety.

Claims

The scope of the claims

[I] An impact absorbing material having an impact receiving surface to which an impact object hits,

Rigid polyurethane foam, and

Supporter layer made of cloth-like body, mesh-like body or linear body

A shock absorber comprising the rigid polyurethane foam and the supporter layer.

[2] The rigid polyurethane foam according to claim 1, wherein the rigid polyurethane foam is foam-molded in a mold, and the supporter layer is disposed in the mold, and the rigid polyurethane foam is foam-molded. A shock absorbing material, characterized in that the body and supporter layer are made into a body.

[3] The impact-absorbing material according to claim 1, wherein the cloth-like body is a riff, a cold koji, or a non-woven fabric.

[4] The impact-absorbing material according to claim 1, wherein the mesh-like body is a net or a mesh.

[5] The shock absorber according to claim 1, wherein the linear body is a wire or a string.

[6] In Claim 1, the shock absorber, characterized in that 50% compression stress of the hard polyurethane foam 2. a 5~20kgfZ cm ^2.

[7] The impact-absorbing material according to claim 1, wherein the density of the rigid polyurethane foam is 40 to 200 kgZm ³ .

[8] The shock absorber according to claim 1, wherein the supporter layer is provided on a side opposite to the shock receiving surface of the shock absorber.

[9] The impact-absorbing material according to claim 1, wherein the surface material is provided between an impact-receiving surface of the impact-absorbing material and an opposite side thereof.

[10] The shock absorber according to claim 1, wherein the surface material is provided on an impact receiving surface of the shock absorber.

[II] The impact-absorbing material according to claim 1, comprising one supporter layer.

[12] The impact-absorbing material according to claim 1, comprising a plurality of supporter layers.

[13] The impact according to claim 1, wherein the thickness of the shock absorber is 5 to: LOOmm. Shock absorber.

2. The shock absorbing material according to claim 1, wherein the shock absorbing material is used by being mounted on an interior part such as a vehicle body, a head liner, or a gut as a vehicle head protecting material.