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:
Jan. 09, 2007
Filed:
Dec. 01, 2004
Shinya Iwasaki, Shizuoka, JP;
Tsuneo Isobe, Shizuoka, JP;
Tsuyoshi Kubota, Shizuoka, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka-ken, JP;
Abstract
A split connecting rod includes a fracture start groove that extends in an axial direction X and is located at the approximate center of each of opposing positions on an inner surface of a crank pin opening. A bearing securing groove is provided on either or both of the opposing positions on the inner surface of the crank pin opening. Notches are provided, respectively, at both ends of each of the opposing positions in the axial direction X on the inner surface of the crank pin opening. The fracture start groove has a stress concentration factor that is greater than those of the notches and the bearing securing groove. Preferably, steel for use as the material of a connecting rod has a carbon content of about 0.05% to about 0.45% by weight, more preferably about 0.10% to about 0.35% by weight.