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. 16, 2014
Filed:
Dec. 02, 2010
Isamu Saito, Saitama-ken, JP;
Yoshihiro Takitani, Saitama-ken, JP;
Shinichiro Kato, Nagoya, JP;
Makoto Hobo, Nagoya, JP;
Keiichiro Kamiya, Nagoya, JP;
Takahiro Miyazaki, Nagoya, JP;
Takashi Kano, Tokyo, JP;
Isamu Saito, Saitama-ken, JP;
Yoshihiro Takitani, Saitama-ken, JP;
Shinichiro Kato, Nagoya, JP;
Makoto Hobo, Nagoya, JP;
Keiichiro Kamiya, Nagoya, JP;
Takahiro Miyazaki, Nagoya, JP;
Takashi Kano, Tokyo, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Daido Steel Co., Ltd., Aichi, JP;
Abstract
A nitrocarburized crankshaft member made of a steel that includes C in an amount by weight of 0.25 to 0.32% as a required element and an optional element that may be included, and Fe and inevitable impurities in a remaining portion. The steel-made crankshaft member mainly includes ferrite and perlite, wherein at least a portion of the steel surface thereof having a ferrite surface area of 50% or greater is imparted with a nitrocarburized hard layer. The nitrocarburized hard layer includes a surface compound layer suppressed to a thickness of 10 to 35 μm, and a nitrogen diffusion zone below the surface compound layer having a diffusion depth of 700 μm or greater. The steel includes C, Si, Mn, Cu, Ni, and Cr as the required elements and Mo, N, s-Al, and Ti as the optional elements.