| 摘要 |
<p>The present invention relates to a power transmission apparatus using a planetary gear having a plurality of gear trains and methods of use thereof. The object of the present invention is to provide a power transmission apparatus and methods of use thereof using a planetary gear having a plurality of gear trains, wherein a ring gear set is included. The ring gear set includes ring gears which are respectively meshed with a planet gear set comprising a plurality of planet gears with different gear ratios. Various speed change ratios can be established through a sun gear by fixing a ring gear when the power is inputted through a carrier. For this purpose, the disclosed power transmission apparatus using a planetary gear having a plurality of gear trains comprises: a housing (100) including a cover (110) which can be opened and closed, and a speed change locking means (120) which locks and releases selectively one of the ring gears (30a,30b,30c); a carrier (10) which is installed inside the housing (100); a planet gear set (20) which consists of three or more different sized planet gears (20a,20b,20c), whereof at least three pairs are installed on one side of the carrier (10) and permitted to rotate freely; a ring gear set (30) which consists of ring gears (30a,30b,30c) whereof each planet gear (20a,20b,20c) meshes with the internal teeth of the ring gears; a sun gear set which consists of sun gears (40a,40b,40c) that mesh with the external teeth of the planet gears (20a,20b,20c), and includes an output shaft (41) which outputs the power to the outside of the housing (100); an input shaft (50) which is coaxial to the output shaft (41) and rotates the carrier (10) by external force transmitted from the outside of the housing (100).</p> |
