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US 6,290,398 B1Granted
Rolling bearing
AssigneeKoyo Seiko Co., Ltd.
InventorsHideki Fujiwara, Haruo Kimura
Life of this patent
Estimating the term…
Abstract
At least one of constituent elements of a rolling bearing is formed of a metallic material which contains an alloy element having a strong affinity for nitrogen while being of low grade in terms of cost and characteristics, and has a nitriding layer formed on surfaces thereof to be hardened. Accordingly, it is possible to use such rolling bearing as a substitute for conventional rolling bearings or rolling bearings of high grade which are known as general rolling bearings.
Claims17
A ball-and-roller bearing comprising:
- (a) an inner race having an outer surface;
- (b) an outer race having an outer surface;
- (c) a plurality of rolling bodies each having an outer surface;
- and
- (d) a holder, at least one of said inner race, outer race, and said plurality of rolling bodies is made of a metallic material containing an alloying element having a high affinity for nitrogen, wherein said at least one of said inner race, outer race, and said plurality of rolling bodies has a nitrided layer having a high density and a high smoothness formed on each of their respective outer surfaces without any intermediate oxide film between said outer surfaces and said nitrided layer, said nitrided layer having an average particle diameter less than or equal to one micron, and
- said metallic material is carburizing steel, stainless steel, or nitriding steel.
3 more elements
A ball-and-roller bearing comprising:
- (a) an inner race having an outer surface;
- (b) an outer race having an outer surface;
- (c) a plurality of rolling bodies each having an outer surface;
- and
- (d) a holder, at least one of said inner race, outer race, and said plurality of rolling bodies is made of a metallic material containing an alloying element having a high affinity for nitrogen, wherein said at least one of said inner race, outer race, and said plurality of rolling bodies each has a nitrided layer having a high density and a high smoothness formed between each of said respective outer surfaces and an oxide film, said nitrided layer having an average particle diameter less than or equal to one micron, and
- said metallic material is carburizing steel, stainless steel, or nitriding steel.
3 more elements
Dependencies are inferred from the claim text.