CPC F16H 1/46 (2013.01) [F16H 57/082 (2013.01); F16H 2001/2872 (2013.01); F16H 2001/2881 (2013.01)] | 20 Claims |
1. A planetary gear mechanism that decelerates rotation input from a motor rotation shaft that rotates about a central axis extending in a vertical direction and outputs the rotation to an outside, the planetary gear mechanism comprising:
a sun gear attached to the motor rotation shaft and rotatable about the central axis;
a fixed internal gear located radially outside the sun gear;
planetary gears that are located radially outside the sun gear and radially inside the fixed internal gear to mesh with the sun gear and the fixed internal gear;
a movable internal gear that is located above the fixed internal gear and radially outside the planetary gears to mesh with the planetary gears, and to rotate about the central axis; and
a carrier that holds upper and lower surfaces of the planetary gears; wherein
the carrier includes an inner protruding portion opposing a portion of upper and lower surfaces of the planetary gears in the vertical direction and protruding toward the upper and lower surfaces of the planetary gears.
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