| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size and manufacturing cost of a planetary gear mechanism. SOLUTION: Each planetary gear mechanism has a structure where a ring gear is rotatably mounted on a sun gear transmission shaft mounted with a sun gear, a carrier is rotatably mounted, in an opposite relation to the ring gear, on a driveshaft disposed coaxially with the sun gear transmission shaft and mounted with an input gear, a plurality of planet gears are arranged rotatably via planet gear support shafts between the carrier and the ring gear, and a large-diameter gear meshed with the sun gear and a small-diameter gear meshed with the input gear are integrally molded on the planet gears.
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