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:
May. 20, 2008
Filed:
Nov. 15, 2004
Applicants:
Katsuhiro Sakurai, Shizuoka-ken, JP;
Tohru Nakagawa, Shizuoka-ken, JP;
Inventors:
Katsuhiro Sakurai, Shizuoka-ken, JP;
Tohru Nakagawa, Shizuoka-ken, JP;
Assignee:
NTN Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16C 3/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A power transmission shaft such as a spline shaft and a serration shaft is provided which has improved static strength and fatigue strength. In a power transmission shaft, a diameter expansion surface is formed in a valley section of a tooth on the opposite side of a shaft end. First blunt sections in the shape of a curved surface are formed in corners between the diameter expansion surface and a tooth surface adjacent to the diameter expansion surface, in order to blunt edges.