Claims
- 1. A system for preventing scuffing of a cylinder wall comprising:
a piston ring, said piston ring including a surface; wherein said surface of said piston ring is coated with tungsten disulfide.
- 2. The system of claim 1, wherein said piston ring further includes a cylinder wall engaging surface;
wherein only said cylinder wall engaging surface of said piston ring is coated with tungsten disulfide.
- 3. The system of claim 1, wherein said piston ring comprises one of ductile iron, cast iron, or steel.
- 4. The system of claim 1, wherein said piston ring comprises a wear resistant coating disposed between said piston ring and said coating of tungsten disulfide.
- 5. The system of claim 1, further comprising:
a piston, said piston including one or more circumferential groves; wherein said circumferential grooves are configured to receive said piston ring.
- 6. The system of claim 1, wherein said coating of tungsten disulfide is approximately 0.5 microns thick.
- 7. The system of claim 1, wherein said tungsten disulfide comprises a dry lubricant.
- 8. A piston ring having a cylinder wall engaging surface comprising:
a first material forming said ring; and a second material coating said cylinder wall engaging surface; wherein said second material comprises tungsten disulfide.
- 9. The piston ring of claim 8, wherein said first material comprises one of cast iron or steel.
- 10. The piston ring of claim 8, wherein said tungsten disulfide comprises a dry lubricant.
- 11. The piston ring of claim 8, wherein all surfaces of said first material are coated by said second material.
- 12. The piston ring of claim 8, wherein said coating of tungsten disulfide is approximately 0.5 microns thick.
- 13. The piston ring of claim 8, wherein said coating of tungsten disulfide is applied to said wall engaging surface by molecular bonding at atmospheric pressure or by a pressurized air application method.
- 14. The piston ring of claim 8, further comprising a third material disposed between said first material and said second material;
wherein said third material comprises a wear resistant coating.
- 15. The piston ring of claim 14, wherein said wear resistant coating comprises one of a chrome face coating, a thermal spray, a nitride layer, or a physical vapor deposition face coating.
- 16. A system for preventing a scuffing of a cylinder wall by a piston ring comprising:
a piston ring, said piston ring having a cylinder wall engaging surface; and a coating disposed on said cylinder wall engaging surface of said piston ring, said coating being configured to reduce friction between said piston ring and the cylinder wall.
- 17. The system of claim 16, wherein said coating comprises tungsten disulfide.
- 18. The system of claim 17, wherein said coating of tungsten disulfide is approximately 0.5 microns thick on said cylinder wall engaging surface.
- 19. The system of claim 16, wherein said coating comprises a dry sacrificial lubricant.
- 20. A system for preventing scuffing of a cylinder wall comprising:
a cylinder bore having a circumferential cylinder wall; a piston disposed within said cylinder bore, said piston including walls extending radially inwardly from an outer radial surface of said piston, said walls defining a circumferential groove; and a piston ring disposed within said circumferential groove, said piston ring including a cylinder wall engaging surface having a coating of tungsten disulfide.
- 21. The system of claim 20, wherein said cylinder bore comprises a green cylinder bore.
- 22. The system of claim 20, wherein said coating of tungsten disulfide comprises a dry lubricant;
said coating of tungsten disulfide being approximately 0.5 microns thick.
- 23. The system of claim 20, wherein said tungsten disulfide is configured to prevent a metal-to-metal contact between said piston ring and said cylinder bore during a removal of asperity contacts.
- 24. A method for preventing scuffing of a cylinder wall comprising coating a surface of a piston ring with tungsten disulfide.
- 25. The method of claim 24, wherein said surface of said piston ring comprises a cylinder wall engaging surface of said piston ring.
- 26. The method of claim 24, wherein said coating a surface of a piston ring with tungsten disulfide comprises applying said tungsten disulfide to said surface by molecular bonding at atmospheric pressure or by a pressurized air application method.
RELATED APPLICATIONS
[0001] The present application claims priority under 35 U.S.C. § 119(e) from the following previously-filed Provisional Patent Application, U.S. Application No. 60/474,059, filed May 29, 2003 by Sytsma et al., entitled “Piston Ring Coating” which is incorporated herein by reference in its entirety.
Provisional Applications (1)
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Number |
Date |
Country |
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60474059 |
May 2003 |
US |