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US 5,030,017 AGranted
Rolling bearing
AssigneeNippon Seiko Kabushiki Kaisha
InventorsYasuo Murakami, Nobuaki Mitamura
Life of this patent
Estimating the term…
Abstract
A rolling bearing has races and a rolling element. At least one of the races and the rolling element is made of a carburized or carbonitrided alloy steel. The content of a fine carbide present in the surface layer of the one element of the rolling bearing is 20-50 vol %. The content of retained austenite in the surface layer is 10-25 vol %. The rolling bearing provides a long-life rolling bearing suitable for use in a transmission and engine.
Claims18
A rolling bearing, comprising:
- races;
- a rolling element;
- and
- wherein at lest one of said races and said rolling element is made of an alloy steel which is then carburized or carbonitrided, the content of fine carbide present in the surface layer of at least one of said races and said rolling element of the rolling bearing is 20-50 vol %, and the content of retained austenite in said surface layer is 10-25 vol %.
1 more element
A rolling bearing comprising:
- races;
- a rolling element;
- and
- wherein at least one of said races and said rolling element is made of an alloy steel essentially consisting of C:
- 0.3-0.6 wt %, Cr:
- 3-14 wt %, Ti:
- 40 ppm or less, O:
- 12 ppm or less, P:
- 200 ppm or less, S:
- 80 ppm or less and the balance of Fe, the alloy steel being carburized or carbonitrided, the content of fine carbide present in the surface layer of at least one of said races and said rolling element of the rolling bearing is 20-50 vol %, and the content of retained austenite in said surface layer is 10-25 vol %.
7 more elements
A rolling bearing comprising:
- races;
- a rolling element;
- and
- wherein at least one of said races and said rolling element is made of an alloy steel essentially consisting of C:
- 0.3-0.6 wt %, Cr:
- 3-14 wt %, Ti:
- 40 ppm or less, Si:
- 0.9 wt % of less, Mo:
- 0.4-2.0 wt %, Mn:
- 2.0 wt % or less, O:
- 12 ppm or less, P:
- 200 ppm or less, S:
- 80 ppm or less and the balance of Fe, the alloy steel being carburized or carbonitrided, the content of fine carbide present in the surface layer of at least one of said races and said rolling element of the rolling bearing is 20-50 vol %, and the content of retained austenite in said surface layer is 10-25 vol %.
10 more elements
A rolling bearing comprising:
- races;
- a rolling element;
- and
- wherein at least one of said races and said rolling element is made of an alloy steel essentially consisting of C:
- 0.3-0.6 wt %, Cr:
- 3-14 wt %, Ti:
- 40 ppm or less, Si:
- 0.9 wt % or less, Mn:
- 2.0 wt % or less, V:
- 0.03-1 wt %, O:
- 12 ppm or less, P:
- 200 ppm or less, S:
- 80 ppm or less and the balance of Fe, the alloy steel being carburized or carbonitrided, the content of fine carbide present in the surface layer of at least one of said races and said rolling element of the rolling bearing is 20-50 vol %, and the content of retained austenite in said surface layer is 10-25 vol %.
10 more elements
A rolling bearing comprising:
- races;
- a rolling element;
- and
- wherein at least one of said races and said rolling element is made of an alloy steel essentially consisting of C:
- 0.3-0.6 wt %, Cr:
- 3-14 wt %, Ti:
- 40 ppm or less, Si:
- 0.9 wt % or less, Mo:
- 0.4-2.0 wt %, Mn:
- 2.0 wt % or less, V:
- 0.03-1 wt %, O:
- 12 ppm or less, P:
- 200 ppm or less, S:
- 80 ppm or less and the balance of Fe, the alloy steel being carburized or carbonitrided, the content of fine carbide present in the surface layer of at least one of said races and said rolling element of the rolling bearing is 20-50 vol %, and the content of retained austenite in said surface layer is 10-25 vol %.
11 more elements
A rolling bearing comprising:
- races;
- a rolling element;
- and
- wherein at lest one of said races and said rolling element is made of an alloy steel essentially consisting of C:
- 0.3-0.6 wt %, Cr:
- 3-14 wt %, Si:
- 0.9 wt % or less, Mn:
- 2.0 wt % or less, Ti:
- 40 ppm or less, O:
- b 12 ppm or less, P:
- 200 ppm or less, S:
- 80 ppm or less and the balance of Fe, the alloy steel being carburized or carbonitrided, the content of fine carbide present in the surface layer of at least one of said races and said rolling element of the rolling bearing is 20-50 vol %, and the content of retained austenite in said surface layer is 10-25 vol %.
9 more elements
Dependencies are inferred from the claim text.