Combined oil ring with spacer/expander having Cr.sub.2 N coating

Details Combined oil ring with spacer/expander having Cr.sub.2 N coating Combined oil ring with spacer/expander having Cr.sub.2 N coating

1996-12-17

1998-02-17

Cummings, Scott

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277235A, F16J 926

Patent

active

057184372

ABSTRACT:
A combined oil ring is comprised of paired upper and lower side rails, and a spacer expander. The side rails are made of martensitic stainless steel and are subjected to gas nitriding. The spacer expander is made of austenitic stainless steel, with a substantially U-shaped cross section, and has an under layer formed by soft nitriding, and has a Cr.sub.2 N film. The Cr.sub.2 N film has a hardness of HV1300 to HV2000 and a thickness of 3 .mu.m to 30 .mu.m. The Cr.sub.2 N film is formed by ion plating on the soft-nitrided layer of the outer circumferential surface.

REFERENCES:
patent: 2713527 (1955-07-01), Pier
patent: 4407515 (1983-10-01), Naito
patent: 4985092 (1991-01-01), Kaede et al.
patent: 5449547 (1995-09-01), Miyazaki et al.
patent: 5587227 (1996-12-01), Ooya

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