| 摘要 |
PURPOSE:To avoid the action of radial loading on a reduction gear mechanism by providing a drive gear, a follower gear, an outer threaded wheel, and an internal gear, constituting a reduction gear, in the outside of a bearing provided between cases. CONSTITUTION:An oil-pressure motor 3 is provided in the motor chamber 2 of a casing 1, its drive shaft 4 is projected outside of the motor chamber 2,and a drive gear 7 is spline-connected with the top of the shaft 4. And, an internal gear case 5 is rotatably attached through a bearing 6 to the casing 1, three spport shafts 10 are attached to the frontal wall of the motor chamber 2, and a follower gear 8 engaged with said drive gear 7 is connected to the tip of an eccentric shaft 12 attached with a bearing 11 to each shaft 10. Then, an outer gear wheel 16 is connected to the periphery of the following gear 8 in such a way that each eccentrical shaft 12 is inserted through the bearing 18 into the hole 17 of the outer gear wheel 16 with an external gear 15. The external gear 15 is engaged with the internal gear 21 on the inside circumference of the case 5. |
