| 摘要 |
PURPOSE:To make the device compact and reduce the backlash thereof by a method wherein a casing rotating type fluid pressure motor is arranged at the inside of flexible gear of a synchronizing reduction gear and a press piece is pushed against the inner peripheral surface of the flexible gear by fluid pressure to deform it elastically. CONSTITUTION:When high pressure fluid is introduced into a cylinder 37 through the ports 38, 39 of a press piece energizing means 35, the press piece 33 pushes the inner peripheral surface 24a of the movable flexible gear 24, the gear 24 deforms elastically so that an external gear 23 engages closely with the inward teeth 21 of an internal gear 22 at two places on a circumference 2 and, therefore, the affection of the backlash may be reduced. When the fluid pressure motor is operated and a rotor 34 is rotated, the press piece 33 slides to move the meshing positions (a), (b) of the inward teeth 21 and outward teeth 23, the teeth 24 rotate per one turn of said positions by an angle corresponding to the difference of teeth between the teeth 21 and the teeth 23 and therefore, the rotation may be taken out of an output shaft. On the other hand, the fluid pressure motor in the synchronizing reduction gear 2 is accommodated and made compact. |
