| 摘要 |
A power transmission device using a planetary gear with multi-gear train and a utilization method thereof are provided to control the gear ratio using the number of tooth formed in a planetary gear, a sun gear and a ring gear. A housing(100) comprises a cover(110) for being opened and closed and a shift lock unit(120) for selectively fixing and releasing ring gears(30a,30b,30c). A carrier(10) is installed inside the housing. A planet gear group(20) comprises at least three pairs of planet gears(20a,20b,20c) which are freely rotated in the one side of the carrier. The planet gears have different dissimilar sizes. A ring gear group(30) is made of ring gears which are geared with the planet gears. The sun gears(40a,40b,40c) of the sun gear group(40) are geared with the planet gears. The sun gear group has an output axis(41) outputted to the outside of the housing. An input shaft(50) is located on the same line as the output axis. The input shaft rotates the carrier with the external force delivered to the outside of the housing.
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