TWO-STAGE PLANETARY GEAR TYPE REDUCTION GEAR

PROBLEM TO BE SOLVED: To facilitate assembly work of a two-stage planetary gear type reduction gear, to facilitate machining of a second sun gear, to carry out compactification, and to secure rotation stability of a first planetary gear while avoiding interference to a gear case of a support pin supporting the first planetary gear. SOLUTION: A first planetary gear mechanism 61 includes a first sun gear 63 provided on an input shaft 95, a ring gear 64 fixed to the gear case 60A, and a first carrier 66 fixed with one end of the support pin 75 rotatably supporting the first planetary gear 65 interlocking with the ring gear 64 and the first sun gear 63. In an inner periphery of the first carrier 66, a second carrier 69A including a second planetary gear mechanism 62A is coaxially connected to an output shaft 45 so as to not relatively rotate, and an annular recessed part 91 facing another end of the support pin 75 inserted into a support hole 76 of the first planetary gear 68 is formed on a wall surface opposing the first planetary gear 68 of the gear case 60A. COPYRIGHT: (C)2011,JPO&INPIT