Title:
MACHINE COMPONENT AND ROLLING BEARING
Document Type and Number:
Japanese Patent JP2023048131
Kind Code:
A
Abstract:
To provide a mechanical component capable of suppressing a secular change of a dimension and improving an indentation start point type rolling fatigue service life on surface thereof.SOLUTION: A machine component is made of steel and has a surface. The steel has been quenched and annealed. The machine component includes a nitriding layer located on the surface and a core part of which distance from the surface is larger than that of the nitriding layer. A nitrogen concentration in the steel on the surface is 0.01 mass% or more. Hardness of the steel on the surface is 820 Hv or more. Retained austenite amount in the steel in the core part is 0.1 vol.% or more and 9 vol.% or less. Dislocation density of the retained austenite in the steel in the core part is 4.0×1014 m-2 or more. The steel is high carbon steel or bearing steel.SELECTED DRAWING: Figure 1
Inventors:
MIZUTA KOHEI
FUJIMURA NAOKI
FUJIMURA NAOKI
Application Number:
JP2022146401A
Publication Date:
April 06, 2023
Filing Date:
September 14, 2022
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD
International Classes:
F16C33/62; C22C38/00; C22C38/22; F16C19/06; F16C33/32; F16C33/64
Domestic Patent References:
| JP2006322017A | 2006-11-30 | |||
| JP2004232858A | 2004-08-19 | |||
| JP2004339575A | 2004-12-02 | |||
| JP2017088958A | 2017-05-25 |
Foreign References:
| US20190101029A1 | 2019-04-04 |
Attorney, Agent or Firm:
Patent Attorney Fukami Patent Office
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