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US 5,241,748 AGranted
Method for manufacturing a compression ring
AssigneeTeikoku Piston Ring Co., Ltd.
InventorMasao Ishida
Life of this patent
Estimating the term…
Abstract
A compression ring provided with both ends having notches is formed on outer peripheral surface with a plasma nitrided layer and is formed on upper and lower surfaces and an inner peripheral surface with soft surface treatment layers. The upper and lower surfaces and the inner peripheral surface may be of base material surfaces.
Claims10
A method for manufacturing compression rings each provided with circumferential ends having notches, comprising:
- coiling a ring material;
- cutting said coiled material to obtain a plurality of rings, each ring having two circumferential ends, upper and lower axially peripheral surfaces, and inner and outer radially peripheral surfaces;
- machining both circumferential ends of each ring to form said notches,
- assembling said plurality of rings on a jig where said axially peripheral surfaces of adjacent rings are in contact;
- applying plasma nitriding to said assembled rings having said adjacent axially peripheral surfaces in contact such that a nitrided layer is formed on only said outer radially peripheral surfaces of said plurality of rings.
2 more elements
Dependencies are inferred from the claim text.