| 摘要 |
PURPOSE:To simplify structure and design a gear transmission device in small size by constituting the device from a coil spring having an engagement piece at one edge and a driven gear which has an engagement groove for an engagement piece and is loosely fitted in a coil spring accommodation chamber. CONSTITUTION:When a motor 2 revolves in the normal direction, a worm wheel 10 revolves in one direction through a worm gear, and the driven gear 40 of the first unidirectional rotary brake mechanism 20 is revolved in the same direction to the worm wheel 10. By the revolution of the driven gear 40, a reduction gear mechanism 12 is revolved, and a power is transmitted to one output shaft 16. When the motor 2 is revolved in the reverse direction, the worm wheel 10 is revolved in the opposite direction through the worm gear, and the driven gear 42 of the second unidirectional rotary brake mechanism 22 is revolved in the same direction to the worm wheel 10. Then, a reduction gear mechanism 14 is revolved, and the power is transmitted to the other output shaft 18. A two-axis selective output mechanism 8 is arranged on a low torque side, and the two-axis selective output mechanism 8 is built in the worm wheel 10. |
