Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Shigekazu Nagai0
Akio Saitoh0
Masaki Imamura0
Ryuichi Masui0
Date of Patent
March 31, 2009
0Patent Application Number
114654900
Date Filed
August 18, 2006
0Patent Primary Examiner
Patent 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.
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