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:
Apr. 01, 2014
Filed:
Dec. 03, 2009
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
The invention relates to a crankshaft member having high fatigue strength and good bending correctability, and its method of manufacture. The steel made crankshaft member mainly consists of a two-phase structure of ferrite and perlite. The steel includes C, Ni, Mn, and Cr as required elements and Si, Cu, Mo, Ti, V, Nb, Ca, and S as optional elements that may be included, in the amounts of C within the range of 0.20 to 0.50 wt %, Si within the range of 0 to 0.6 wt %, Mn within the range of 0.5 to 1.5 wt %, Cu within the range of 0 to 0.7 wt %, Ni within the range of 0.05 to 1.5 wt %, Cr within the range of 0.05 to 0.45 wt %, and Mo within the range of 0 to 0.5 wt % to satisfy the condition 115≧70C+8Si+23Mn+11Cu+128Cr+83Mo≧50. A portion of the member surface is provided at least with a hard nitride layer having an average hardness within the range of 300 to 450 HV. Lamellar spacing of the perlite is 0.3 μm or less.