Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1994-01-31
1995-11-28
Cuda, Irene
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
2988807, 29888076, B23P 1500
Patent
active
054696160
ABSTRACT:
Each side rail of a combined oil ring, which includes a spacer-expander and two side rails, has an ion nitriding treatment layer on an outer peripheral surface of the rail. The inner peripheral surface of each rail may either be a bare surface or have either a soft surface treatment or a hard chrome plating. The upper and lower surfaces of the rail may either be a bare surface or have a soft surface treatment. The method comprises coiling a strip to form a coil, placing the coil on a jig so that only the outer peripheral surface is exposed to the ion nitriding and then cutting the coil to form the individual rails with a gap.
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Patent Abstracts of Japan, vol. 9, No. 261 (M-422)[1984] Oct. 18, 1985 of Japanese Published Application 60-108551 of Jun. 14, 1985.
Harayama Akira
Ishida Masao
Kazama Nobuyuki
Miyazaki Satomichi
Cuda Irene
Teikoku Piston Ring Co. Ltd.
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