Piston ring

Details Piston ring Piston ring

1992-06-04

1995-04-11

Cuchlinski, Jr., William A.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277236, 29888074, 29888075, F16J 900

Patent

active

054051541

ABSTRACT:
A compression ring as a piston ring adapted to by received in an annular groove formed in a piston disposed in a cylinder assembly of an internal combustion engine includes an annular ring base member having a cutout portion, the ring base member having an outer sliding surface, upper and lower surfaces continuous to the sliding surface through corner portions and an inner peripheral surface to be fitted to the piston groove, the sliding surface contacting an inner wall of the cylinder when the piston reciprocates therein. A nitriding layer is formed on all the surfaces of the ring base member by a nitriding treatment. A white portion of the nitriding layer formed only on the sliding surface of the ring base member is substantially completely removed and white portions of the nitriding layer formed on the first and second surfaces and corner portions between the sliding surface and the upper and lower surfaces are removed so as to reduce thicknesses thereof to not more than 5 .mu.m.

REFERENCES:
patent: 1435592 (1922-11-01), Doan et al.
patent: 1783047 (1930-11-01), Marshall
patent: 2380654 (1945-07-01), Lane et al.
patent: 4557492 (1985-12-01), Tsuchiya et al.
patent: 4570946 (1986-02-01), Tsuchiya et al.
patent: 4579355 (1986-04-01), Kooroki

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