Eccentric orbiting type speed reducer
AssigneeTeijin Seiki Co., Ltd.
InventorKenichi Fujimoto
Life of this patent
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Abstract
In a speed reducer, because the idler gears 62 that mesh with the drive gear 58 and the external gears 55 fixed to the crankshafts 45 are provided between those gears 55 and 58, the reduction of the diameters of the external gears 55 and the drive gear 58 can be easily accomplished. Consequently, the inertia moment, and hence the size of the servomotor for driving, become smaller, and vibration and the noise caused by engagement can be reduced as well. The radial distance L between the crankshaft 45 and the center axis Z of the speed reducer 64 can be easily increased to improve the rigidity of the speed reducer 64 in the circumferential direction.
Claims5
Eccentric orbiting type speed reducer comprising:
- a cylindrical member having internal gear teeth on its inner circumference;
- pinions, each having external gear teeth that mesh with the internal gear teeth;
- a carrier having pillars that penetrate through the pinions in an axial direction;
- multiple crankshafts arranged equiangularly in a circumferential direction, each of the crankshafts having axial ends both rotatably supported by the carrier, and an axial middle portion penetrating through the pinions;
- external gears, each fixed to the one axial end of a respective one of the crankshafts;
- a drive gear located in a position surrounded by the external gears;
- and
- multiple idler gears, each rotatably supported by the carrier to be located between and mesh with the drive gear and a respective one of the external gears.
Dependencies are inferred from the claim text.