HOLLOW FIXED SHAFT REDUCTION GEAR

PROBLEM TO BE SOLVED: To provide a hollow fixed shaft reduction gear which is short in the axial direction, prevents a lubricating oil from leaking, and is manufacturable at low cost.SOLUTION: An output flange 20 is attached to the outer peripheral side of a lower bearing 24, and rotatably supported on an upper bearing 46. Therefore, a hollow fixed shaft 22 is not rotated. The hollow fixed shaft is fixed to a housing 40 with bolts. Since the leakage of a lubricating oil caused by the rotation of the hollow fixed shaft can be basically prevented, an oil seal at the bottom of the hollow fixed shaft 22 is not required, and accordingly, the length of the reduction gear in the direction of the hollow fixed shaft 22 can be shortened. Screw holes 48a, 48b for screwing a turning object to the upper bearing 46 are provided to the output flange 20 and the upper bearing 46, respectively. Mounting bolts are inserted into the screw holes 48a, 48b, and tightened to mount the turning object on the reduction gear 10A. Since the turning object can be dismounted by merely loosening the bolts, the turning object can be mounted and dismounted easily.