Variable speed frictional drive transmissions

Details Variable speed frictional drive transmissions Variable speed frictional drive transmissions

1985-11-22

1987-05-26

Kundrat, Andrew V.

Machine element or mechanism

Mechanical movements

Grip units and features

74796, F16H 1526, F16H 1550

Patent

active

046675256

ABSTRACT:
Variable speed frictional drive transmissions that basically depend on driving balls arranged in constant rolling frictional contact with a pair of inner and a pair of outer concentric and axially separable ball races are improved by the provision of (1) new speed control units for changing the relative positions of balls and races to produce desired speed changes and (2) new cam and roller units for maintaining the balls and races in forced contact even when the transmissions are under no-load condition. The new transmissions are characterized by (A) outer and inner circular concave race tracks and (B) a simplified hydraulic feed-back control mechanism which displaces the outer control race only in the direction of speed increase, while its opposite displacement is actuated by torque forces plus spring pressure.
In contrast to prior devices of their class, the new transmissions (a) do not produce any gyrotory forces at any speed of operation, (b) do not increase input torque requirements as output speed is decreased, (c) do not have parts that may get out of phase when the transmissions are under no-load condition and (d) have greater power capacity per unit size.

REFERENCES:
patent: 2590800 (1952-03-01), Stephenson
patent: 3248960 (1966-05-01), Schottler
patent: 4314485 (1982-02-01), Adams
patent: 4570501 (1986-02-01), Perry
patent: 4593574 (1986-06-01), Sinn et al.

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