PURPOSE: To reduce the manufacturing cost of a planetary gear and prevent partial abutment of the planetary gear so as to prolong the service life by constituting the planetary gear of a speed reducing gear mechanism such that a plurality of gears each having a small tooth width are superposed in the axial direction for relative rotation.
CONSTITUTION: A speed reducing gear mechanism 41 comprises a sun gear 20, a planetary gear 42 revolving while rotating around the sun gear 20 in mesh with the sun gear 20 and an internal gear 6A of a ring gear 6, a pin 23 for rotatably supporting the planetary gear 42 via a bearing 22, and a carrier 24 fixed to the pin 23 for transmitting the revolution of the planetary gear 42 to another sun gear 26. The planetary gear 42 is such constituted that gears 43 each having a small tooth width are superposed on each other in the axial direction for relative rotation. Gears each having a small tooth width can be easily molded by plastic working such as punching by press, thus reducing the manufacturing cost. Moreover, partial abutment of a tooth surface of the planetary gear can be alleviated because the gears are meshed with each other by the relative rotation. Therefore, any damage of the planetary gear can be prevented, thereby prolonging the service life.
UZAWA NOBUO
YAMAMOTO SHINOBU
| JPS6245449U | 1987-03-19 | |||
| JPS3530201Y1 |