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. 31, 2009
Filed:
Aug. 18, 2006
Shigekazu Nagai, Tokyo, JP;
Akio Saitoh, Kawaguchi, JP;
Ryuichi Masui, Bando, JP;
Masaki Imamura, Moriya, JP;
Shigekazu Nagai, Tokyo, JP;
Akio Saitoh, Kawaguchi, JP;
Ryuichi Masui, Bando, JP;
Masaki Imamura, Moriya, JP;
SMC Kabushiki Kaisha, Tokyo, JP;
Abstract
Helical gears, which are provided for a sun gear, planet gears, and an internal gear, have helix angles θ of not less than 25 degrees and not more than 45 degrees. Pawls provided for lock sections and internal gear lock receiving sections of the internal gear have rising angles γ, respectively, that satisfy the relational expression, 0 ≦tan γ<(η·di)/{dp·tan(90−α)}, wherein α is the helix angle of the sun gear, η is the screw efficiency of the sun gear as a sliding screw, dp is the pitch circle diameter of the sun gear, and di is an outer diameter of the internal gear defining a center of application of torque of the pawls.