Slide member for shock absorber of vehicle

Patent metadata

Field	Value
Publication number	US-10041537-B2
Application number	US-201615070171-A
Country	US
Kind code	B2
Filing date	Mar 15, 2016
Priority date	Mar 16, 2015
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

According to the present invention, there is provided a slide member for a shock absorber of a vehicle including a back metal, a porous sintered metal layer containing a porous sintered metal formed on the back metal and a resin with which the porous sintered metal is impregnated and covered, and a resin slide layer formed on the porous sintered metal layer and having a smooth slide surface, and the slide member is formed in a cylindrical shape so that the resin slide layer is disposed on an inner peripheral side. The resin slide layer is composed of polytetrafluoroethylene and a plurality of granular elements dispersed in the polytetrafluoroethylene, and the granular element is composed of molybdenum disulfide and molybdenum trioxide, and/or tungsten disulfide and tungsten trioxide.

First claim

The invention claimed is:

1. A slide member for a shock absorber provided between a vehicle body and a wheel of a vehicle for supporting a piston rod reciprocally sliding in an axial direction in the shock absorber, comprising:
a back metal;
a porous sintered metal layer containing a porous sintered metal formed on the back metal and a resin with which the porous sintered metal is impregnated and covered; and
a resin slide layer formed on the porous sintered metal layer and having a slide surface,
wherein the slide member is formed in a cylindrical shape, and the resin slide layer is disposed on an inner peripheral side of the slide member, and
the resin slide layer includes polytetrafluoroethylene and a plurality of granular elements dispersed in the polytetrafluoroethylene, and wherein
each granular element includes two-dimensional crystal layers of molybdenum disulfide and at least one two-dimensional crystal layer of molybdenum trioxide, the two-dimensional crystal layers of molybdenum disulfide and the at least one two-dimensional crystal layer of molybdenum trioxide form a multilayered structure, and one of the at least one two-dimensional crystal layer of molybdenum trioxide is disposed between two of the two-dimensional crystal layers of molybdenum disulfide.

2. The slide member according to claim 1 , wherein a surface roughness of the slide surface of the resin slide layer is equal to or less than 5 μm in ten-point average roughness (Rz).

3. The slide member according to claim 1 , wherein an average particle diameter of the plurality of granular elements is 5 to 25 μm, and a content amount of each granular element in the resin slide layer is 5 to 30 vol. %.

4. The slide member according to claim 1 , wherein a content amount of the molybdenum trioxide in each granular element is 20 to 50 vol. %.

5. The slide member according to claim 1 , wherein the resin slide layer further contains carbon and/or graphite of 5 vol. % or less in total.

6. The slide member according to claim 1 , wherein the slide surface has a ten-point average roughness (Rz) of equal to or less than 15 μm.

7. The slide member according to claim 1 , wherein the granular elements are obtained by oxidizing powder of molybdenum disulfide while maintaining a layered structure of the two-dimensional crystals layers of molybdenum disulfide.

8. A slide member for a shock absorber provided between a vehicle body and a wheel of a vehicle for supporting a piston rod reciprocally sliding in an axial direction in the shock absorber, comprising:
a back metal;
a porous sintered metal layer containing a porous sintered metal formed on the back metal and a resin with which the porous sintered metal is impregnated and covered; and
a resin slide layer formed on the porous sintered metal layer and having a slide surface,
wherein the slide member is formed in a cylindrical shape, and the resin slide layer is disposed on an inner peripheral side of the slide member, and
the resin slide layer includes polytetrafluoroethylene and a plurality of granular elements dispersed in the polytetrafluoroethylene, and each granular element includes two-dimensional crystal layers of tungsten disulfide and at least one two-dimensional crystal layer of tungsten trioxide, the two-dimensional crystal layers of tungsten disulfide and the at least one two-dimensional crystal layer of tungsten trioxide form a multilayered structure, and one of the at least one two-dimensional crystal layer of tungsten trioxide is disposed between two of the two-dimensional crystal layers of tungsten disulfide.

9. The slide member according to claim 8 , wherein a surface roughness of the slide surface of the resin slide layer is equal to or less than 5 μm in ten-point average roughness (Rz).

10. The slide member according to claim 8 , wherein an average particle diameter of the plurality of granular elements is 5 to 25 μm, and a content amount of each granular element in the resin slide layer is 5 to 30 vol. %.

11. The slide member according to claim 8 , wherein a content amount of the tungsten trioxide in each granular element is 20 to 50 vol. %.

12. The slide member according to claim 8 , wherein the resin slide layer further contains carbon and/or graphite of 5 vol. % or less in total.

13. The slide member according to claim 8 , wherein the slide surface has a ten-point average roughness (Rz) of equal to or less than 15 μm.

14. The slide member according to claim 8 , wherein the granular elements are obtained by oxidizing powder of tungsten disulfide while maintaining a layered structure of the two-dimensional crystals layers of tungsten disulfide.

Assignees

• Daido Metal Co

Inventors

• Iwata Hideki
• Ito Yoshifumi

Classifications

• F16C2240/48

  Particle sizes · CPC title

• F16C33/128 Primary

  Porous bearings, e.g. bushes of sintered alloy · CPC title

• F16F9/36

  Special sealings, including sealings or guides for piston-rods ({F16F9/325, F16F9/3485 take precedence; arrangements for filling via piston rod sealing or guiding means F16F9/432} ; sealing of moving parts in general F16J15/16 - F16J15/56) · CPC title

• F16C33/201

  Composition of the plastic · CPC title

• F16C2208/02

  comprising fillers, fibres · CPC title