Title:
TRACK WHEEL AND SHAFT
Document Type and Number:
WIPO Patent Application WO/2022/202922
Kind Code:
A1
Abstract:
In the present invention, a track wheel (10) has a surface (10c) coming into contact with a roller (20) that has a diameter of 1.5 mm to 4.0 mm and in which the value obtained by dividing the length by the diameter is 4 to 10. The track wheel (10) is made of steel. The track wheel has a surface layer part (11) on the surface, and a core part (12) on the inside of the surface layer part. The nitrogen content of the steel in the surface layer part is higher than the nitrogen content of the steel in the core part. At a first position (P1) at a distance of 0.05 mm from the surface and a second position (P2) at a distance of 0.20 mm from the surface, the hardness of the steel is 720 Hv or above. A value obtained by subtracting the hardness of the steel at the second position from the hardness of the steel at the first position is 30 Hv or below.
Inventors:
KUBOTA YOSHINOBU (JP)
Application Number:
PCT/JP2022/013650
Publication Date:
September 29, 2022
Filing Date:
March 23, 2022
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
C21D9/40; C21D1/06; C22C38/00; F16C19/26; F16C33/44
Foreign References:
| JP2016108616A | 2016-06-20 | |||
| JP2012237338A | 2012-12-06 | |||
| JP2006071022A | 2006-03-16 | |||
| JP2017106535A | 2017-06-15 |
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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