| 摘要 |
A planet gear retarder for a servo motor has a spindle extending through two semi-housings. The spindle has a central gear secured at a middle portion thereof. Two first planet gears and two second planet gears are coaxially assembled in the semi-housings and at diametrically opposite sides of the spindle. The first planet gears are engaged with the central gear. A belt gear is provided at an outer periphery of the second semi-housing and connected with the major power source by a first belt. An input axle has a gear end formed at a first end thereof, and a second end extending outside the second semi-housing. The second planet gears are engaged with the gear end. A driven wheel is secured on the second end of the input axle and connected with a servo motor by a second belt.
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