Thk Co., Ltd.

Kotaro Kushida

Hideo Saito

Yuichi Mizutani

A speed reducing apparatus is provided which can prevent nonuniformity from occurring in output torque. A speed reducing apparatus that causes a first face gear to incline in such a manner as to mesh with a second face gear and causes the first face gear to oscillate in such a manner as to move a meshing portion in a circumferential direction includes a ball spline portion that supports the first face gear in an inclinable manner. The ball spline portion includes an outer ring, an inner ring, a ball capable of rolling along a ball groove of the outer ring and a ball groove of the inner ring, and a cage having a pocket in which the ball is incorporated, and allows axial displacement of the first face gear.

Speed reducing or increasing apparatus

A speed-reducing or -increasing apparatus, with first and second crown gears facing one another, with a cam unit that causes the first crown gear to incline with respect to the second crown gear so that the first crown gear meshes with the second crown gear, that causes the first crown gear to precess in such a manner as to move the meshing position, and couples to an input or output shaft. A rolling element is between the cam unit and the first crown gear, and the cam unit includes a first member that couples to the input or output shaft and a second member made of steel and including a rolling element rolling portion where the rolling element rolls, the second member configured to be incapable of rotating relatively to the first member, and at least part of the first member having a lower specific gravity than the second member.

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Tokyo, Japan

Kotaro Kushida