Continuously variable hydrostatic transmission with neutral-sett

Details Continuously variable hydrostatic transmission with neutral-sett Continuously variable hydrostatic transmission with neutral-sett

1995-10-16

1997-07-01

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Input pump and rotary output motor system having...

60489, 60492, F16D 3900

Patent

active

056426178

ABSTRACT:
A continuously variable hydrostatic transmission includes axially aligned input and output shafts journaled by a transmission housing and respectively coupled to a prime mover and a load. The input shaft drives a hydraulic pump unit, while a hydraulic motor unit is grounded to the transmission housing. A wedge-shaped swashplate is pivotally connected to the output shaft in operative position to accommodate pressurized hydraulic fluid exchanges between the pump and motor units. A controller is coupled to adjust the angular orientation of the swashplate relative to the output shaft axis and thus set the transmission ratio. A hydraulic circuit, connected into the hydraulic motor unit, is selectively operable to vent high and low fluid pressure sides of the swashplate to atmosphere, thus imposing a neutral transmission ratio condition regardless of the transmission ratio set by the controller.

REFERENCES:
patent: 3131540 (1964-05-01), Ritter
patent: 3906727 (1975-09-01), Hull
patent: 5486142 (1996-01-01), Folsom
patent: 5493862 (1996-02-01), Folsom
patent: 5524437 (1996-06-01), Larkin et al.
patent: 5531072 (1996-07-01), Larkin
patent: 5540048 (1996-07-01), Larkin et al.

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