Hydraulic control apparatus for vehicle continuously variable tr

Details Hydraulic control apparatus for vehicle continuously variable tr Hydraulic control apparatus for vehicle continuously variable tr

1990-12-17

1992-03-10

Braun, Leslie A.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74867, 474 28, 474 11, F16H 1102, B60K 4116

Patent

active

050941291

ABSTRACT:
A hydraulic control control apparatus for controlling a speed ratio of a vehicle continuously variable transmission, which includes a device for producing a first pressure varying with the input shaft speed of the transmission, a device for producing a second pressure varying with the currently required output of the vehicle engine, a device for producing a third pressure varying with the vehicle speed, such that a rate of increase in the third pressure is limited after the vehicle speed pressure reaches a predetermined upper limit which varies with the second pressure, and a shift control valve device including a valve spool operated to control the hydraulic actuator for changing the speed ratio so as to shift-down the transmission, in relation to an increase in the second pressure and an increase in the vehicle speed pressure, and changing the speed ratio so as to shift-up the transmission, in relation to an increase in the first speed pressure.

REFERENCES:
patent: 4618123 (1986-10-01), Bilharz et al.
patent: 4663991 (1987-05-01), Nakamura et al.
patent: 4781655 (1988-11-01), Tezuka
patent: 4797327 (1988-05-01), Itoh et al.
patent: 4942786 (1990-07-01), Dittrich

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