| 摘要 |
PROBLEM TO BE SOLVED: To easily improve circumferential rigidity in a compact and low-priced eccentric rotary reduction gear causing less oscillation and less noise. SOLUTION: An idle gear 62 is interspaced between an external gear 55 and a driving gear 58 fixed at a crank shaft 45 so that the idle gear 62 meshes with the external gear 55 and the driving gear 58, thereby easily reducing the diameters of the external gear 55 and the driving gear 58. Moment of inertia is accordingly small enough to downsize a driving servomotor and to decrease oscillation and noise during the gear meshing. The distance L in the radial direction between the crank shaft 45 and the center axis Z of the reduction gear 64 can be enlarged enough to improve the circumferential rigidity of the reduction gear 64. |
