Oil ring assembly

Details Oil ring assembly Oil ring assembly

1989-11-21

1990-12-25

Shoap, Allan N.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277223, 277236, 277DIG6, F16J 900

Patent

active

049797573

ABSTRACT:
A compound steel oil ring assembly has nitrided side rails and a spacer expander. The opposing end portions of each side rail are treated to prevent formation of a nitride layer solely at these portions in order to reduce their hardness. This reduces the degree to which the corner portions of the opposing ends wear away the side surfaces of a piston oil ring groove.

REFERENCES:
patent: 2807511 (1957-09-01), Fleming
patent: 3522949 (1970-08-01), Wells
patent: 4299401 (1981-11-01), McCormick
patent: 4407515 (1983-10-01), Naito
patent: 4557492 (1985-12-01), Tsuchiya et al.
patent: 4643079 (1987-02-01), Brann et al.
patent: 4747602 (1988-05-01), Kobayashi et al.

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