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:
Nov. 05, 2019
Filed:
Dec. 10, 2015
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Kenji Tamura, Takatsuki, JP;
Junichi Okubo, Amagasaki, JP;
Ken Yoshino, Guangdong, CN;
Kunihiro Yabuno, Matsubara, JP;
Hiroyuki Kurokawa, Nishinomiya, JP;
Tomohisa Yamashita, Suita, JP;
Sho Takamoto, Osaka, JP;
Koichiro Ishihara, Kyoto, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A method for producing a forged crankshaft includes a die forging step of forming a forged blank having a crankshaft shape by die forging, and a pressing step of pressing the forged blank by a first dies. The forged blank includes first excess portions attached to some or all of crank arms each incorporating a counterweight, each of the first excess portions protrudes from a side portion of the crank arm, in a region near a journal. In the pressing step, the first excess portions are deformed by the first dies such that each of the first excess portions bulges toward a pin. This facilitates the production of a forged crankshaft with a reduced weight and assured stiffness.