| 摘要 |
PURPOSE:To reduce noise compared with that of gears by permitting a center roller, planet rotors provided with small and large diameter portions and a rotary output ring circumscribing said small and large diameter portions to contact frictionally each other. CONSTITUTION:Three planet rollers 17 circumscribe a center roller 16. Arms 18a-18c of a holder 18 supported through bearings 27 by the center roller 16 are provided between these planet rollers 17. These planet rollers 17 and the holder 18 are sandwiched and restrained in the direction of thrust by a pair of thrust rings 28 (one is not shown) fitting the peripheral groove of the center roller 16. Each planet roller 17 is of the cylindrical form with a predetermined diameter and formed with the peripheral groove 17a having the width which is about the half of the length of the roller to provide a small diameter portion. A circumscribing ring 20 circumscribes the low peripheral surface of the peripheral groove 17a and a circumscribing ring 19 circumscribes the large diameter portion of the planet rollers 17. |
