发明名称 |
Combined oil ring |
摘要 |
A combined oil ring is comprised of a steel oil ring having a generally I-shaped section consisting of upper and lower rails and a web connecting the both rails and a coil expander for forcing the oil ring outwardly. Each of the outer circumferential sliding surfaces of the circumferential outer projecting portions in the upper and lower rails forms a nitrided surface with a hardness of Hv 900 or more, at least one of the upper and lower surfaces in the circumferential outer projecting portion forms a surface with a hardness of lower than Hv 700, and a width of the outer circumferential sliding surface is smaller than 0.25 mm. The other surface of the upper and lower surfaces forms a nitrided surface with a hardness of Hv 900 or more or a surface with a hardness of lower than Hv 700.
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申请公布号 |
US5295696(A) |
申请公布日期 |
1994.03.22 |
申请号 |
US19930034663 |
申请日期 |
1993.03.22 |
申请人 |
TEIKOKU PISTON RING CO., LTD. |
发明人 |
HARAYAMA, AKIRA;ARUGA, KAZUYOSHI |
分类号 |
F02F5/00;F16J9/06;F16J9/20;F16J9/26;(IPC1-7):F16J9/06 |
主分类号 |
F02F5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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