US 12,326,180 B2
Speed reducing or increasing apparatus
Hideo Saito, Tokyo (JP); and Kotaro Kushida, Tokyo (JP)
Assigned to THK CO., LTD., Tokyo (JP)
Appl. No. 18/554,351
Filed by THK CO., LTD., Tokyo (JP)
PCT Filed Mar. 30, 2022, PCT No. PCT/JP2022/016120
§ 371(c)(1), (2) Date Oct. 6, 2023,
PCT Pub. No. WO2022/220128, PCT Pub. Date Oct. 20, 2022.
Claims priority of application No. 2021-067556 (JP), filed on Apr. 13, 2021.
Prior Publication US 2024/0191778 A1, Jun. 13, 2024
Int. Cl. F16H 1/32 (2006.01)
CPC F16H 1/321 (2013.01) 17 Claims
OG exemplary drawing
 
1. A speed reducing or increasing apparatus that causes a first face gear to incline to mesh with a second face gear and causes the first face gear to oscillate to move a meshing portion in a circumferential direction, the speed reducing or increasing apparatus comprising:
a ball spline portion supporting the first face gear in an inclinable manner, the ball spline portion allowing axial displacement of the first face gear, the ball spline portion including
an outer ring comprising a ball groove,
an inner ring comprising a ball groove,
a ball configured to roll along the ball groove of the outer ring and the ball groove of the inner ring, and
a cage having a pocket in which the ball is incorporated; and
a motion conversion portion converting rotational motion of an input portion into precession of the first face gear, the motion conversion portion including
an inclination cam,
a plurality of first rolling elements interposed between the inclination cam and a first ring that is fixed to the first face gear, and
a plurality of second rolling elements interposed between the inclination cam and a second ring that is fixed to a housing, the motion conversion portion being disposed between the housing and the first face gear.