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:
Mar. 10, 2020
Filed:
Mar. 29, 2016
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Hiroki Narumiya, Tokyo, JP;
Osamu Kada, Tokyo, JP;
Takashi Fujita, Tokyo, JP;
Yutaka Neishi, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A gear keeping the bending stress at the dedendum from becoming locally high at the time of power transmission and thereby raising the dedendum bending strength. The radius of curvature is maximum at a critical section position determined by the Hofer's 30° tangent method. Both radii of curvature from the critical section position to the first and second connecting points Xand Yare constant or decreasing. In dedendum line segment, there are points Aand Bwhere radius of curvature is smaller than the critical section position. In the dedendum line segment, the maximum radius of curvature is 3 times or less the minimum radius of curvature. By a cross-sectional view, the critical section position is part of an arc, and the arc extends to the two sides of the critical section position. Thus, the maximum bending stress becomes smaller and dedendum bending strength is improved.