The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 31, 2024
Filed:
Mar. 04, 2022
Applicant:
Nippon Steel Corporation, Tokyo, JP;
Inventors:
Tatsuhiko Abe, Tokyo, JP;
Yoko Sueyasu, Tokyo, JP;
Assignee:
NIPPON STEEL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16C 3/08 (2006.01); C21D 6/00 (2006.01); C21D 8/00 (2006.01); C21D 9/30 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/24 (2006.01);
U.S. Cl.
CPC ...
F16C 3/08 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/005 (2013.01); C21D 9/30 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/24 (2013.01); F16C 2202/02 (2013.01); F16C 2202/04 (2013.01); F16C 2204/62 (2013.01); F16C 2204/64 (2013.01); F16C 2204/74 (2013.01); F16C 2220/70 (2013.01); F16C 2240/18 (2013.01); F16C 2360/22 (2013.01);
Abstract
A crankshaft with improved fatigue strength is provided. A crankshaftincludes journals, pins, and fillets, each fillethaving a residual stress distribution where the residual stresses are compressive residual stresses from the surface down to a depth of at least 300 μm, the maximum value of the compressive residual stress being not lower than 1000 MPa, the surface roughness Rz being lower than 3.00 μm.