| 摘要 |
PURPOSE:To set the working speed of a member to be driven arbitrarily by screwing a male screw member penetrated into a motor shaft into the female screw hole of an output gear. CONSTITUTION:When the motor shaft 1 of a motor A is turned, an eccentric cam 6 is rotated together with the motor shaft 1, and an eccentric gear 4 is revolved while using the motor shaft 1 as the center of revolution in the clockwise direction. Since the external teeth of the eccentric gear 4 are engaged with the internal teeth of a fixed internal gear 3, the eccentric gear 4 revolves only by one turn in the clockwise direction along the internal teeth of the fixed internal gear 3 while turning on its axis in the counterclockwise direction per one turn of the motor shaft 1, one turn of the eccentric gear 4. The rotation of the eccentric gear 4 turns an output gear 5 engaged with the internal teeth of the eccentric gear 4 in the counterclockwise direction. The ratio of the number of teeth of the eccentric gear 4 to the output gear 5 is changed, thus acquiring an arbitrary change gear ratio. |
