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. 08, 2025
Filed:
Sep. 24, 2021
Nippon Steel Corporation, Tokyo, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Tatsuhiko Abe, Tokyo, JP;
Manabu Kubota, Tokyo, JP;
Satoru Okawa, Tokyo, JP;
Motoichi Murakami, Gotenba, JP;
Takashi Koyama, Mishima, JP;
Yusuke Morita, Mishima, JP;
Takeshi Fukui, Aichi-ken, JP;
Yusuke Inukai, Aichi-ken, JP;
Yuichiro Kajiki, Aichi-ken, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota, JP;
Abstract
A crankshaft with improved seizure resistance is provided. A crankshaft () is a crankshaft including journals () and pins (), having a chemical composition of, in mass %: 0.35 to 0.40% C; up to 0.70% Si; 1.00 to 2.00% Mn; up to 0.50% Cr; up to 0.050% Al; up to 0.020% N; up to 0.020% P; 0.005 to 0.200% S; and balance Fe and impurities, each of the journals () and pins () having a surface microstructure containing tempered martensite in not less than 80 volume % and a surface hardness not higher than HV 450.