Title:
SHAFT MEMBER AND ROLLING BEARING
Document Type and Number:
WIPO Patent Application WO/2023/080064
Kind Code:
A1
Abstract:
This shaft member is made of steel and has a surface. The steel contains 0.10-0.40 mass% (inclusive) of carbon, 0.10-2.50 mass% (inclusive) of silicon, 0.30-1.20 mass% (inclusive) of manganese, 0.40-3.00 mass% (inclusive) of chromium, and 1.00 mass% or less of molybdenum, with the remainder made up by iron and unavoidable impurities. The distance between the surface of the shaft member and a first position at which the hardness of the steel is 653 Hv is 0.2-1.0 mm (inclusive). The nitrogen concentration at the surface is 0.2-1.2 mass% (inclusive), and the carbon concentration at the surface is 0.6-1.2 mass% (inclusive). The half-value width of the peak of the martensite crystal (211)-face at a second position at which the depth Z (unit: mm) from the surface relative to the diameter D (unit: mm) of the shaft member is 0.085D in X-ray diffraction peaks is 6.5° or less.
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Inventors:
OGAWA YUKI (JP)
KAMURA NAOYA (JP)
YAMAUCHI KIYOSHIGE (JP)
KAMURA NAOYA (JP)
YAMAUCHI KIYOSHIGE (JP)
Application Number:
PCT/JP2022/040301
Publication Date:
May 11, 2023
Filing Date:
October 28, 2022
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
C22C38/00; C22C38/34; F16C19/46; F16C33/34; F16C33/62; F16H1/28; F16H57/08; C21D1/06; C21D9/28; C23C8/32; C23C8/34
Domestic Patent References:
| WO2009054530A1 | 2009-04-30 | |||
| WO2022202922A1 | 2022-09-29 |
Foreign References:
| JP2015105435A | 2015-06-08 | |||
| JP2013221207A | 2013-10-28 | |||
| JP2007321854A | 2007-12-13 | |||
| JP2007009997A | 2007-01-18 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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