Ball-rolling type torque transmission device

Details Ball-rolling type torque transmission device Ball-rolling type torque transmission device

1996-07-11

1997-11-04

Wright, Dirk

Planetary gear transmission systems or components

Planet periphery surrounds axis of interacting gear

Gear teeth comprise rolling bodies

F16H 1306, F16H 128

Patent

active

056833237

ABSTRACT:
In a ball-rolling type torque transmission device, an outer race groove an inner race groove are provided between the eccentric rotation disc and the input shaft, the output shaft or a first stationary member within the housing, the outer race groove being defined along a hypocycloidal curve having N+2 lobes, while the inner race groove defined along an epicycloidal curve having N lobes. Rollable balls are placed to position at N+1 points between the inner race groove and the outer race groove. A rectifying member is provided between the eccentric rotation disc and the input shaft, the output shaft or a second stationary member within the housing to rectify a movement of the eccentric rotation disc by cancelling an eccentric component of the eccentric rotation disc. A geometrical relationship between L1, L2, R1 and R2 being defined as follows: L1/L2=R1/R2 where L1 is a wavelength of one lobe of the outer race groove along which each of the balls rolls, L2 is a wavelength of one lobe of the inner race groove along which each of the balls rolls, R1 is a distance from a center of each of the balls to a first line formed by connecting points in which each of the balls inscribes the inner race groove, and R2 is a distance from a center of each of the balls to a second line formed by connecting points in which each of the balls inscribes the outer race groove.

REFERENCES:
patent: 4643047 (1987-02-01), Distin et al.
patent: 4829851 (1989-05-01), Imase
patent: 4922781 (1990-05-01), Peiji
patent: 5443428 (1995-08-01), April et al.

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