Title:
CRANKSHAFT AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/139936
Kind Code:
A1
Abstract:
Provided is a crankshaft which has excellent fatigue strength and in which the formation of quenching cracks is suppressed. A crankshaft (10) comprising a pin portion (12) and a pin top portion (15), wherein: the pin portion (12) has a sliding portion (121) having a constant outer diameter and fillet portions (122) formed contiguously with the sliding portion (121); each fillet portion (122) has a hardened region (122a), which is a region where the hardness is higher than the hardness of the core portion of the sliding portion 121 by 100 HV or more, on the surface thereof; the thickness (d1) of the hardened region (122a) of a fillet portion (122) is at least 12.0% of the radius (R) of the sliding portion (121); and the prior-austenite grain size of the pin top portion (15) is 60 μm or less.
Inventors:
ABE TATSUHIKO (JP)
SUEYASU YOKO (JP)
SUEYASU YOKO (JP)
Application Number:
PCT/JP2022/044132
Publication Date:
July 27, 2023
Filing Date:
November 30, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
F16C3/08; C21D1/10; C21D9/30; C22C38/00; C22C38/60
Foreign References:
| JP2005325443A | 2005-11-24 | |||
| JP2018141218A | 2018-09-13 | |||
| JP2005060723A | 2005-03-10 |
Attorney, Agent or Firm:
UEBA, Hidetoshi et al. (JP)
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