Two-piece oil ring for use in internal combustion engine, steel

Details Two-piece oil ring for use in internal combustion engine, steel Two-piece oil ring for use in internal combustion engine, steel

1992-01-17

1994-04-19

Andrews, Melvyn J.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148325, 29888073, 29888074, 277138, 277235A, C21D 800, C22C 3818, B23P 1506, F16J 920

Patent

active

053042620

ABSTRACT:
A two-piece oil ring, for use in an internal combustion engine, with the oil ring being made from a martensitic stainless steel material having high consisting essentially of more than 0.8 wt % but less than 0.95 wt % of C, not more than 1.0 wt % of Si, not more than 1.0 wt % of Mn, from 15.0 wt % to 20.0 wt % of Cr and a balance substantially Fe and incidental impurities. The oil ring has a hardness ranging from HV300 to HV450 and a substantially H- or X-shaped cross-section. A web portion interconnecting left and right halves of the H- or X-shaped cross-section has a thickness not greater than 0.3 in terms of the ratio of the total thickness of the ring. Oil passage holes are formed in the web portion. A nitrided layer is formed on the sliding surface thereof which makes a sliding contact with the inner surface of a cylinder of the engine. The material may further contain suitable amounts of at least one of Mo, W, V, Nb, Ni and Co. The oil ring is produced by bending a wire of the martensitic stainless steel material by a process including warm roll dies plastic working and a subsequent cold roll dies plastic working through which a modified cross-section is imparted to the material, continuous annealing, punching for forming oil passage holes by punching, and continuous hardening and tempering.

REFERENCES:
patent: 4085490 (1978-04-01), McCormick et al.
patent: 4948556 (1990-08-01), Kumagai
patent: 4966751 (1990-10-01), Kaede et al.
Patent Abstracts of Japan M-279 Feb. 24, 1984 vol. 8/No. 43 (58-197455).

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