| 摘要 |
PURPOSE:To enable large ratio of speed reduction to be set, by providing endless cam grooves, formed meandering in a curve of a periodic function respectively, on each facing side of two rotary discs oppositely arranged to each other and interposing balls, held by a holding member on an output shaft, between the both cam grooves. CONSTITUTION:A rotor 5 is fixed to one end of an input rotary shaft 3 rotatably supported through a bearing 4 in a case 1 provided in a sationary condition. Then a rotary disc 8 facing to this rotor 5 is supported on the input rotary shaft 3 through a bearing 18 by a supporting cylidner 17 integrally formed with the rotary disc 8. Endless cam grooves 7,9, formed meandering in a sinusoidal shape at a prescribed pitch in the peripheral direction with respect to a circular line 6 being as the center, are provided on oppositely facing sides of the both rotary discs 5, 8, and said both cam grooves 7, 9 are connected to each other through plural balls 10. Then these balls 10 are held so as to be movable in the radial direction in a slit 13 extended in the radial direction of a holding member 11 fixed to one end of an output rotary shaft 14. |
