Water lubrication type bearing material

Patent metadata

Field	Value
Publication number	US-10196576-B2
Application number	US-201615542403-A
Country	US
Kind code	B2
Filing date	Jan 12, 2016
Priority date	Jan 17, 2015
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

A water lubrication type bearing material contains 12 wt. % to 25 wt. % of a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA resin), 18 wt. % to 33 wt. % of a carbon fiber, and a remainder including a polytetrafluoroethylene (PTFE) resin and/or a modified PTFE resin. The bearing material has excellent wear resistance and sliding characteristics for a water lubrication type bearing.

First claim

The invention claimed is:

1. A water lubrication type bearing material comprising:
12 wt. % to 25 wt. % of a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA resin);
18 wt. % to 33 wt. % of a carbon fiber; and
42 wt. % to 70 wt. % of a remainder including a polytetrafluoroethylene (PTFE) resin and/or a modified PTFE resin,
wherein the carbon fiber is a curved/twisted carbon fiber having a curvature radius in a range of 50 to 1500 μm, and
no solid lubricant is blended in the water lubrication type bearing material.

2. The water lubrication type bearing material according to claim 1 , wherein the carbon fiber is a pitch-based carbon fiber.

3. The water lubrication type bearing material according to claim 1 , wherein a length of the carbon fiber is 70 to 200 μm.

4. The water lubrication type bearing material according to claim 1 , being used as a bearing for water circulation type seal system of ship.

5. The water lubrication type bearing material according to claim 1 , wherein the modified PTFE is a copolymer of tetrafluoroethylene and an unsaturated compound selected from a group consisting of fluoroalkyl trifluoroethylene, ethylene, and propylene.

6. The water lubrication type bearing material according to claim 1 , wherein the PFA has a melt flow rate value (MFR) of less than 15 g/10 min in accordance with ASTMD3307.

7. The water lubrication type bearing material according to claim 1 , being arranged inside a metallic member.

8. The water lubrication type bearing material according to claim 2 , wherein a length of the carbon fiber is 70 to 200 μm.

9. The water lubrication type bearing material according to claim 2 , being used as a bearing for water circulation type seal system of ship.

10. The water lubrication type bearing material according to claim 2 , wherein the modified PTFE is a copolymer of tetrafluoroethylene and an unsaturated compound selected from a group consisting of fluoroalkyl trifluoroethylene, ethylene, and propylene.

11. The water lubrication type bearing material according to claim 2 , wherein the PFA has a melt flow rate value (MFR) of less than 15 g/10 min in accordance with ASTMD3307.

12. The water lubrication type bearing material according to claim 2 , being arranged inside a metallic member.

13. The water lubrication type bearing material according to claim 1 , wherein the remainder is the PTFE resin and/or the modified PTFE resin, wherein blending amounts of the PFA resin, the carbon fiber, and the remainder are 14 wet. % to 20 wt. %, 20 wt. % to 30 wt. %, and 50 wt. % to 66 wt. %, respectively.

14. The water lubrication type bearing material according to claim 1 , wherein a molecular weight of the PTFE resin and/or the modified PTFE resin is 500,000 to 3,000,000.

Assignees

• Eagle Ind Co Ltd

Inventors

• Matsumoto Takanobu

Classifications

• C10N2050/08

  Solids · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2040/02

  Bearings · CPC title

• C08K7/06

  Elements · CPC title

• B63H23/34

  Propeller shafts; Paddle-wheel shafts; Attachment of propellers on shafts · CPC title