Claims
- 1. A combination of a cylinder liner and a piston ring suitable for use in an internal combustion engine, wherein the cylinder liner is made of cast iron or steel,said cast iron or steel containing an iron oxide film provided on at least a part of an inner circumferential surface of the cylinder liner, said iron oxide film containing Fe3O4 as a major constituent, and wherein the iron oxide film is formed by either molten nitrate treatment or water vapor treatment.
- 2. A combination of a cylinder liner and a piston ring suitable for use in an internal combustion engine, wherein the cylinder liner is made of cast iron or steel,said cast iron or steel containing an iron oxide film provided on at least a part of an inner circumferential surface of the cylinder liner, said iron oxide film containing Fe3O4 as a major constituent, wherein the iron oxide film is formed by either molten nitrate treatment or water vapor treatment, and wherein the piston ring contains a metallic nitride film on at least a sliding surface thereof.
- 3. The combination of the cylinder liner and piston ring of claim 2, wherein the metallic nitride film is formed by PVD or CVD.
- 4. The combination of the cylinder liner and piston ring of claim 2, wherein the metallic nitride film is selected from the group consisting of Cr—N alloy, Cn—B—N alloy, Ti—N alloy and Cr—B—V—N alloy.
- 5. A combination of a cylinder liner and a piston ring suitable for use in an internal combustion engine, wherein the cylinder liner is made of cast iron or steel,said cast iron or steel containing an iron oxide film provided on at least a part of an inner circumferential surface of the cylinder liner, said iron oxide film containing Fe3O4 as a major constituent, wherein the metallic nitride contains oxygen in an amount of 1 to 15 mass %, and carbon in an amount of 1 to 15 mass %, in a solid solution state within the crystal structure of Cr—N, and wherein the piston ring contains a metallic nitride film on at least a sliding surface thereof.
- 6. The combination of the cylinder liner and piston ring of claim 5, wherein the metallic nitride film has a thickness of about 5 to 120 μm.
- 7. The cylinder liner and piston ring combination of claim 5, wherein a nitride layer is formed between the base material of the piston ring and the metallic nitride film.
- 8. A combination of a cylinder liner and a piston ring suitable for use in an internal combustion engine, wherein the cylinder liner is made of cast iron or steel,said cast iron or steel containing an iron oxide film provided on at least a part of an inner circumferential surface of the cylinder liner, said iron oxide film containing Fe3O4 as a major constituent wherein the iron oxide film has numerous pores having diameters of approximately 1 μm.
- 9. The combination of the cylinder liner and piston ring of claim 8, wherein the iron oxide film has a thickness of 0.5 to 100 μm.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-308761 |
Oct 1999 |
JP |
|
Parent Case Info
This application is the national phase under 35 U.S.C. §371 of PCT International Application No. PCT/JP00/06753 which has an International filing date of Sep. 29, 2000, which designated the United States of America and was not published in English.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP00/06753 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO01/33065 |
5/10/2001 |
WO |
A |
US Referenced Citations (12)