SELF-LUBRICATING COMPOSITE FRICTION PART

• US 20170175812A1
• Filed: 06/29/2015
• Published: 06/22/2017
• Est. Priority Date: 07/16/2014
• Status: Active Grant

• Current Assignee: Hydromecanique et Frottement
• Original Assignee: HEF USA
• Inventors: MASSE, Emmanuel, BLANDENET, Olivier
• Granted Patent: US 10,900,522 B2
• Time in Patent Office: Days
• CPC Class Codes: F16C 17/02 for radial load only
• CPC Class Codes: F16C 17/243 related to temperature and heat, e.g. for preventing overheating
• CPC Class Codes: F16C 2208/32 Polytetrafluorethylene [PTFE] F16C2208/58 takes precedence
• CPC Class Codes: F16C 2208/40 Imides, e.g. polyimide [PI], polyetherimide [PEI] F16C2208/58 takes precedence
• CPC Class Codes: F16C 2208/82 Composites, i.e. fibre reinforced thermosetting resins
• CPC Class Codes: F16C 2220/08 by compression-moulding
• CPC Class Codes: F16C 2220/28 by winding impregnated fibres in general B29C70/00
• CPC Class Codes: F16C 29/02 Sliding-contact bearings
• CPC Class Codes: F16C 33/208 Methods of manufacture, e.g. shaping, applying coatings

Abstract

Disclosed is a self-lubricating composite friction part (1) that can be subjected, during operation, to temperatures that are at least equal to 250° C. The part includes, along the friction surface (2), a single layer of a material consisting of weft and warp yarns made of polytetrafluoroethylene, the material being impregnated with a thermostable resin having a glass transition temperature that is at least equal to 250° C. It is applied to a reinforcing layer (3).

Claims

1. Self-lubricating composite friction part being able to be subjected in operation to temperatures at least equal to 250°

C., comprising, along the friction surface, a single layer of a fabric formed by weft and warp strands of polytetrafluoroethylene, this fabric being impregnated with a heat-stable resin having a glass transition temperature at least equal to 250°

C.

2. Part according to claim 1, the fabric of which is a weave formed by crossings of pairs of weft strands and of pairs of warp strands.

3. Part according to claim 1, in which the weft strands or the warp strands are formed by short fibres linked to one another.

4. Part according to claim 1, the fabric of which has a thickness of at least 0.10 mm.

5. Part according to claim 4, the fabric of which has a thickness of at least 0.5 mm.

6. Part according to claim 1, the weft strands and the warp strands of which have a count of at least 100 dtex.

7. Part according to claim 1, in which the resin is a thermosetting polyimide.

8. Part according to claim 1, comprising moreover a reinforcing layer bordering the fabric opposite the friction surface, this reinforcing layer being impregnated with the same resin as the fabric.

9. Part according to claim 1, constituting a bearing.

10. Part according to claim 1, constituting a guide rail.

11. Method for the manufacture of a self-lubricating composite friction part according to claim 1, according to which a layer of fabric is formed by the helical winding of a strip of fabric formed by weft strands and warp strands, all constituted by polytetrafluoroethylene, on a mandrel according to a winding angle such that the strip comes edge-to-edge with itself after each turn, the fabric is impregnated with a heat-stable resin having a glass transition temperature of at least 250°

C.

12. Method according to claim 11, according to which the resin is a thermosetting polyimide.

13. Part according to claim 2, in which the weft strands or the warp strands are formed by short fibres linked to one another.

14. Part according to claim 2, the fabric of which has a thickness of at least 0.10 mm.

15. Part according to claim 3, the fabric of which has a thickness of at least 0.10 mm.

16. Part according to claim 2, the weft strands and the warp strands of which have a count of at least 100 dtex.

17. Part according to claim 3, the weft strands and the warp strands of which have a count of at least 100 dtex.

18. Part according to claim 4, the weft strands and the warp strands of which have a count of at least 100 dtex.

19. Part according to claim 5, the weft strands and the warp strands of which have a count of at least 100 dtex.

20. Part according to claim 2, in which the resin is a thermosetting polyimide.