| 摘要 |
There is disclosed a planetary backward and forward drive apparatus comprising a planetary gear mechanism disposed between an input and an output shafts. The planetary gear mechanism includes a carrier connected to the input shaft, two step planet gears supported by the carrier and consisting of a large first gear and a small second gear, a first sun gear connected to the output shaft, and a second sun gear freely rotatably mounted on the first sun gear and meshing with the second gear. A forward drive condition is provided when the carrier and the second sun gear are connected to each other by an operation of a hydraulic clutch, and a backward drive condition is provided when the second sun gear is fixed to a stationary case by an operation of a hydraulic brake.
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