Claims
- 1. A bearing comprising
a backing material; a porous layer on said backing layer, and an extruded bearing material layer impregnated into the porous layer,
wherein said bearing material layer is a continuous consolidated structure comprising a continuous polytetrafluorethylene matrix and discrete particles of an additive material, wherein said bearing material layer has a portion above the porous layer.
- 2. The bearing of claim 1, wherein the bearing material layer is substantially blister free.
- 3. The bearing of claim 1, wherein the additive particles are microscopically and macroscopically homogeneously distributed within the polytetrafluoroethylene matrix.
- 4. The bearing of claim 1, wherein said backing material is a metal strip.
- 5. The bearing of claim 4, wherein the porous layer comprises bronze particles sintered to the metal backing.
- 6. The bearing of claim 1, wherein the additive material comprises inorganic particulate filler.
- 7. The bearing of claim 6, wherein bearing material layer comprises 10 to 30% by volume of inorganic filler material.
- 8. The bearing of claim 6, wherein the inorganic filler material comprises calcium fluoride.
- 9. The bearing of claim 1, wherein the bearing material layer further comprises an organic filler material.
- 10. The bearing of claim 1, wherein the additive material comprises polyphenylene sulphide.
- 11. The bearing of claim 10, wherein the bearing material layer comprises 30 to 70% by volume of polyphenylene sulphide.
- 12. The bearing of claim 1, wherein the portion of the bearing material layer above the surface of the porous layer is greater than 25 microns.
- 13. The bearing of claim 1, wherein the portion of the bearing material layer above the surface of the porous layer is less than 300 microns.
- 14. A plastic bearing material comprising an extruded unsintered tape or strip operable to be impregnated into a porous layer disposed upon a backing material, wherein the extruded unsintered tape comprises a polytetrafluoroethylene matrix and discrete particles of an additive material.
- 15. The plastic bearing material of claim 14, wherein the additive particles are microscopically and macroscopically homogeneously distributed within the polytetrafluoroethylene matrix.
- 16. The plastic bearing material of claim 14, wherein the additive material comprises an inorganic particulate filler.
- 17. The plastic bearing material of claim 15, having 10 to 30% by volume of inorganic particulate filler
- 18. The plastic bearing material of claim 17, wherein the inorganic particulate filler comprises calcium fluoride.
- 19. The plastic bearing material of claim 14, further comprising an organic filler material.
- 20. The plastic bearing material of claim 14, wherein the additive material comprises polyphenylene sulphide.
- 21. The plastic bearing material of claim 20, having 30 to 70% by volume of polyphenylene sulphide.
- 22. A method of manufacture comprising:
providing an extruded unsintered tape or strip comprising a polytetrafluoroethylene matrix and discrete particles of an additive material; impregnating said extruded unsintered tape into a porous layer disposed upon a backing material; sintering the impregnated unsintered tape at a temperature above the melting point of the polytetrafluoroethylene to form a continuous consolidated bearing material layer.
- 23. The method of claim 22, wherein the additive particles are microscopically and macroscopically homogeneously distributed within the polytetrafluoroethylene matrix.
- 24. The method of claim 22, wherein said backing material is a metal strip.
- 25. The method of claim 23, wherein the porous layer comprises bronze particles sintered to the metal backing.
- 26. The method of claim 22, wherein the additive material comprises an inorganic particulate filler.
- 27. The method of claim 26, wherein the extruded unsintered tape comprises 10 to 30% by volume of inorganic filler material.
- 28. The method of claim 22, wherein the extruded unsintered tape further comprises a polymeric material.
- 29. The method of claim 22, wherein the extruded unsintered tape comprises polyphenylene sulphide.
- 30. The method of claim 29, wherein the extruded unsintered tape comprises 30 to 70% by volume of polyphenylene sulphide.
- 31. The method of claim 22, wherein the extruded unsintered tape is ram extruded.
- 32. The method of claim 22, wherein the extruded unsintered tape layer is impregnated at a temperature below the melting point of polytetrafluoroethylene.
- 33. The method of claim 22, further comprising the step of drying the unsintered tape at a temperature sufficient to remove a lubricant liquid from the unsintered tape before impregnating the unsintered tape into the porous layer.
- 34. The method of claim 22, wherein the steps are a continuous process.
- 35. The method of claim 22, wherein a portion of the bearing material layer is above the surface of the porous layer.
- 36. The method of claim 22, wherein the surface of the bearing material layer is substantially free of blisters.
- 37. The method of claim 36, wherein the portion of the bearing material layer above the surface of the porous layer is greater than 25 microns.
- 38. The method of claim 36, wherein the portion of the bearing material layer above the surface of the porous layer is less than 300 microns.
- 39. A method of manufacture of a bearing comprising the method of claim 22.
- 40. A bearing manufactured by a method comprising the method of claim 22.
STATEMENT OF RELATED APPLICATION
[0001] The present application claims priority under 35 U.S.C. § 19(e) from U.S. Provisional Application Ser. No. 60/451,500 filed Mar. 3, 2003, entitled “Enhanced Metal/Polymer Bearing Construction,” the disclosure of which is incorporated herein by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60451500 |
Mar 2003 |
US |