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

1991-11-12

Braun, Leslie A.

Machine element or mechanism

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

Preselected indexed position

74869, B60K 4112

Patent

active

050638165

ABSTRACT:
A hydraulic control apparatus for controlling the speed ratio of a vehicle continously variable transmission having a clutch device disposed in series with the transmission in a power transmitting line, to disconnect the power transmitting line when a shift lever is placed in a neutral position. The apparatus includes a first shift control valve for producing a first output for changing the speed ratio, based on a required output pressure corresponding to the currently required vehicle acceleration value, and a first input shaft speed corresponding to the transmission input shaft speed, a second shift control valve device for producing a second output for changing the speed ratio, based on a second input shaft speed pressure and an output shaft speed pressure corresponding to the input and output shaft speeds of the clutch device, respectively, so as to reduce a difference between the input and output shaft speeds of the reversing device, and a switching valve device for applying the first and second outputs to the transmission when the shift lever is operated to the drive and neutral positions, respectively.

REFERENCES:
patent: 4778435 (1988-10-01), Sugaya et al.
patent: 4794819 (1989-01-01), Tanaka et al.
patent: 4819514 (1989-04-01), Yamamuro et al.
patent: 4827803 (1989-05-01), Miyawaki
patent: 4939958 (1990-07-01), Hayasaki

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