| 摘要 |
PURPOSE:To achieve a speed reducing ratio of a wide range with a small number of gears, by applying an internal gear device having a difference in number of teeth equal to 1, to a specific hypocycloid 2K-H type planetary gear drive. CONSTITUTION:An external planetary gear having a number of teeth Z1 is rotatably supported on an eccentric shaft as an input shaft which also serves as a carrier. The external planetary gear meshes with an internal gear having a number of teeth Z2 to carry out planetary motion in association with rotation of the eccentric shaft. An internal gear having a number of teeth Z4 is fixed to a side surface of the external planetary gear, and meshes with an external gear having a number of teeth Z3 integrally connected to an output shaft. With this arrangement, a speed reducing ratio of a wide range may be arbitrarily selected by using gears having addendum modification coefficients satisfying a specific condition and also having a relationship of Z2-Z1=1 and Z4-Z3=1.
|
