| 摘要 |
PROBLEM TO BE SOLVED: To provide an eccentric oscillation type gear device which can easily change a gear ratio.SOLUTION: A reduction gear 1 comprises: an inner gear 50 which is arranged at an input shaft 10 concentrically therewith; two outer gears 30, 40 which are engaged with the inner gear 50; a cam shaft 20 which eccentrically oscillates the outer gears 30, 40 which are arranged separately from the input shaft 10 with respect to the inner gear 50; and a carrier 60 having a pin member 61 to be inserted while having a clearance between pin insertion holes 32, 42 of the outer gears 30, 40. The outer gears 30, 40 have inner teeth 33, 43 at internal peripheries of the pin insertion holes 32, 42. The reduction gear 1 comprises an auxiliary gear 11 which rotates integrally with the input shaft 10, and a pin outer gear 70 which is arranged at an external periphery of the pin member 61 so as to be relatively rotatable with respect to the pin member 61. The pin outer gear 70 has first outer teeth 71 which are engaged with the inner teeth 33, 43 of the pin insertion holes 32, 42, and second outer teeth 74 which are engaged with the auxiliary gear 11. |
