Planetary gear type speed reducer with two-stage reduction gear

摘要

PROBLEM TO BE SOLVED: To increase a change gear ratio between an input shaft and an output shaft at a change-gear having several stages of planetary gear mechanism assembled to each other, prevent oscillation of rotating components or the like and perform its smooth operation.SOLUTION: A planetary gear mechanism of each stage of a speed-up gear/speed reducer is constituted by a sun gear SG placed at the center, a ring gear RG composed of inner gear and planetary gears PG present between them. The planetary gears PG are double-stage reduction gears, a large-diameter gear PG1 is engaged with the sun gear SG and a small-diameter gear is engaged with the ring gear RG. A carrier 3 supporting the planetary gears PG is fixed to a housing 1, and a rotary operating member 4 in which the ring gear RG and the sun gear SG of the next stage are integrally formed is arranged to be adjacent to the fixed carrier 3 and supported at the carrier 3 in bearings in a thrust direction and a radial direction. Since the rotating member such as each of the gears is stably rotated under a state in which it is supported by bearings, a smooth power transmission can be carried out even if a speed of an output shaft is increased from an input shaft to perform a driving operation.