Title:
BALL BEARING
Document Type and Number:
WIPO Patent Application WO/2024/024605
Kind Code:
A1
Abstract:
A ball bearing (100) comprises an inner ring (10), an outer ring (20), and a ball (30). At least one bearing component, from among the inner ring, the outer ring, and the ball, has a contact surface (10da, 20ca, 30a). The bearing components are formed from steel that has undergone nitriding, quenching, and tempering. The steel contains carbon: 0.90 mass% to 1.20 mass% inclusive; silicon: 0.35 mass% to 0.80 mass% inclusive; manganese: 0.80 mass% to 1.20 mass% inclusive; nickel: less than 0.30 mass%; chromium: 0.80 mass% to 1.30 mass% inclusive; and molybdenum: less than 0.10 mass%, with the remainder being iron and unavoidable impurities. The value obtained by dividing the silicon concentration in the steel by the manganese concentration in the steel is less than 0.51.
Inventors:
KAWAI TAKASHI (JP)
OHKI CHIKARA (JP)
OHKI CHIKARA (JP)
Application Number:
PCT/JP2023/026501
Publication Date:
February 01, 2024
Filing Date:
July 20, 2023
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
C22C38/00; C21D1/06; C21D9/40; C22C38/44; C23C8/26; F16C19/06; F16C33/62
Foreign References:
| JP2014238118A | 2014-12-18 | |||
| US20170335440A1 | 2017-11-23 | |||
| JP2004052101A | 2004-02-19 | |||
| JP2015042897A | 2015-03-05 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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