Hydraulically operated continuously variable transmission

Details Hydraulically operated continuously variable transmission Hydraulically operated continuously variable transmission

1987-07-23

1990-02-20

Look, Edward K.

Power plants

Pressure fluid source and motor

Input pump and rotary output motor system having...

60487, F16D 3900

Patent

active

049015290

ABSTRACT:
A hydraulically operated continuously variable transmission includes a hydraulic pump coupled to an input shaft, a variable-displacement hydraulic motor coupled to an output shaft, and a closed hydraulic circuit interconnecting the hydraulic pump and the hydraulic motor and including a passage connecting the inlet and outlet ports of the hydraulic pump. A servomotor makes and breaks the hydraulic circuit respectively by opening and closing the outlet port. A clutch valve continuously varies the cross-sectional area of the passage to change the amount of power transmitted between the hydraulic pump and the hydraulic motor. A control system independently controls the servomotor and the clutch valve, the control system being arranged to hold the servomotor in a position to open the outlet port when the clutch valve is opened beyond a prescribed degree. The hydraulic motor has motor plungers axially movable through a stroke which is variable by a tiltable motor swash plate which can be tilted by another servomotor. The servomotors include pilot valves which are operatively coupled to each other by a cam mechanism. The hydraulic circuit is kept broken when a motor vehicle incorporating the transmission runs at a prescribed speed or a higher speed and the angle of inclination of the motor swash plate is substantially minimal.

REFERENCES:
patent: 3175363 (1965-03-01), Molly
patent: 3364679 (1968-01-01), Osojnak
patent: 4444093 (1984-04-01), Koga et al.
patent: 4478134 (1984-10-01), Kawahara et al.
patent: 4646520 (1987-03-01), Furumoto
patent: 4745748 (1988-05-01), Hayashi

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