| 摘要 |
A reduction gear where a plurality of small sized motors are used to reduce the length in the longitudinal direction of a rotation structure. A planetary gear device in which a hollow reduction gear (10) has a crankshaft (11), a pinion (12) having outer teeth formed on its outer circumference and fitted for eccentric movement in a crank section of the crankshaft (11), and a case (13) having inner teeth formed on its inner circumferential surface, the inner teeth meshing with the outer teeth of the pinion (12). A hole is formed inside the hollow reduction gear (10), an input center gear of the hollow reduction gear (10) is disposed at a position in the hole, and small gears provided at the output shafts of the motors simultaneously mesh with the center gear. |
