| 摘要 |
Helical gears, which are provided for a sun gear, planet gears, and an internal gear, have helix angles theta 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 gamma, respectively, that satisfy the relational expression, 0 <=tan gamma<(eta.di)/{dp.tan(90-alpha)}, wherein alpha is the helix angle of the sun gear, eta 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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