Piston ring and method of manufacturing the same

Details Piston ring and method of manufacturing the same Piston ring and method of manufacturing the same

2006-05-30

2006-05-30

Pickard, Alison K. (Department: 3673)

Seal for a joint or juncture

Seal between relatively movable parts

Piston ring or piston ring expander or seat therefor

C427S526000

Reexamination Certificate

active

07052019

ABSTRACT:
A manufacturing method of a piston ring is developed, wherein the method provides a countermeasure for wear of butt ends of the ion plating film coated piston ring and a countermeasure for breakage of the piston ring and the piston ring manufactured at a low cost. A thickness of the film (2) in the vicinity of butt ends (7) of a piston ring (1) is made greater than the thickness of the film (2) at other outer peripheral surface. Piston ring blanks (5) are rotated around their own axes toward an evaporation source (4) and a speed is lowered when the butt ends (7) face the evaporation source (4).

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