Oil seal means for rotary piston engines including a nitrided an

Details Oil seal means for rotary piston engines including a nitrided an Oil seal means for rotary piston engines including a nitrided an

1978-06-07

1980-09-30

Vrablik, John J.

Rotary expansible chamber devices

With mechanical sealing

Seal element between working member and cylinder

418178, 418179, 291564WL, F01C 1908, F01C 2104

Patent

active

042252946

ABSTRACT:
The side housing of a rotary piston engine has an inner surface which has been subjected to a soft-nitriding treatment to form a layer of Fe-C-N type compounds and thereafter ground to provide a surface roughness of between 0.3 and 15 microns. An oil seal which slidably engages the inner surface of the side housing has a sealing lip constituted by a chromium plating. The arrangement provides an improved wear resistance of the oil seal.

REFERENCES:
patent: Re28918 (1976-07-01), Humbert
patent: 3456624 (1969-07-01), Okamoto
patent: 3575537 (1971-04-01), Yamamoto et al.
patent: 3712767 (1973-01-01), Beutter
patent: 3827920 (1974-08-01), Shimoda et al.
patent: 3833320 (1974-09-01), Telang et al.

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