US 11,725,713 B2
Planetary gear mechanism and geared motor
Yoichi Sekii, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Filed by Nidec Corporation, Kyoto (JP)
Filed on Dec. 6, 2021, as Appl. No. 17/542,797.
Claims priority of application No. 2020-203173 (JP), filed on Dec. 8, 2020.
Prior Publication US 2022/0178423 A1, Jun. 9, 2022
Int. Cl. F16H 1/46 (2006.01); F16H 57/08 (2006.01); F16H 1/28 (2006.01)
CPC F16H 1/46 (2013.01) [F16H 57/082 (2013.01); F16H 2001/2872 (2013.01); F16H 2001/2881 (2013.01)] 20 Claims
OG exemplary drawing
 
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.