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US 2002/0162523 A1Published application
Sliding member and method of manufacturing thereof
AssigneeNissan Motor Co., Ltd.
InventorMotokata Ishihara
Life of this patent
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Abstract
A sliding member (12) is disclosed that has superior slidability and durability at a low cost. A top sliding surface (12a) of the sliding member (12) is formed by a nitriding process that creates a compound layer (14) and a diffusion layer (15) on a base metal (16) of the sliding member (12). The buff polishing process is thinly performed on an outermost layer portion (14a) of the compound layer (14), such that a portion of the compound layer (14b and/or 14c) remains.
Claims13
A sliding member comprising:
- a base metal;
- a diffusion layer with a predetermined depth overlying said base metal;
- and
- a compound layer with a second predetermined depth overlying said diffusion layer,
- said diffusion layer and said compound layer being formed on an outer surface of said base metal through a nitriding process, and said second predetermined depth of said compound layer being formed by a polishing process on an outermost layer portion of said compound layer such that an original depth of said compound layer formed by said nitriding process is reduced in depth to said second predetermined depth of said compound layer so that a smooth sliding surface remains.
2 more elements
A method of manufacturing a sliding member, comprising:
- creating a diffusion layer and a compound layer having predetermined depths on a base metal of said sliding member through a nitriding process;
- and
- performing a polishing process on an outermost layer portion of said compound layer, such that said predetermined depth of said compound layer is reduced in depth so that a portion of said compound layer remains to create a smooth sliding surface on said sliding member.
The method of manufacturing as set forth in one of claims 8-13, wherein
- said smooth sliding surface of said compound layer after performing said polishing process has a surface roughness of Ra 0.01-0.05.
Dependencies are inferred from the claim text.