Hydraulic control for a continuously variable transmission

Details Hydraulic control for a continuously variable transmission Hydraulic control for a continuously variable transmission

1987-06-15

1988-05-31

Leppink, James A.

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Fluid pressure actuator for adjustment of member

74731, F16H 1102

Patent

active

047478098

ABSTRACT:
A torque sensitive squeeze control for a variable ratio pulley drive system has a fluid translating unit, such as a pump, disposed in the input torque path. One member of the fluid translating unit is rotated by the input drive shaft while another member is fixed for rotation with an input pulley shaft. If a rotational difference between the input drive shaft and the pulley shaft is present, the fluid translating unit is effective to increase the pressure in the squeeze control piston of the input pulley thereby increasing the torque capacity of the pulley. A speed differential will occur when a torque difference between the two shafts if present. The hydraulic control for the output pulley is via a controlled servo valve mechanism which permits operator control of the drive ratio between the pulleys independently of the squeeze force on the input pulley.

REFERENCES:
patent: 3918312 (1975-11-01), Espenschied et al.
patent: 4608031 (1986-08-01), Vahabzadeh
patent: 4642069 (1987-02-01), Sawada et al.

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