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:
Jul. 09, 2024
Filed:
Feb. 19, 2021
Applicant:
Nippon Steel Corporation, Tokyo, JP;
Inventors:
Assignee:
NIPPON STEEL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16C 3/08 (2006.01); C23C 8/26 (2006.01); C21D 7/13 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/18 (2006.01);
U.S. Cl.
CPC ...
F16C 3/08 (2013.01); C21D 7/13 (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 38/18 (2013.01); C23C 8/26 (2013.01); F16C 2202/04 (2013.01); F16C 2202/10 (2013.01); F16C 2206/04 (2013.01); F16C 2223/02 (2013.01); F16C 2223/14 (2013.01); F16C 2223/30 (2013.01);
Abstract
A crankshaft with improved seizure resistance is provided. A crankshaft having journalsand pinsincludes a compound layer containing iron and nitrogen on its surface, wherein, in the compound layer, for both the journalsand pins, the porosity area ratio of the thinner one of a region from the surface to a depth of 3.0 μm and a region across the total thickness of the compound layer is not higher than 10.0%, and both the journalsand pinshave such a surface geometry that the arithmetical mean deviation of the primary profile, Pa, is not larger than 0.090 μm.