Hydrostatic transmission control

Details Hydrostatic transmission control Hydrostatic transmission control

1977-02-11

1978-03-07

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of or by input to input pump...

60445, 60468, 60493, F16H 3946

Patent

active

040772128

ABSTRACT:
A hydrostatic transmission comprising a closed loop system incorporating a hydraulic pump and a hydraulic motor driven by the pump has an accelerator for the motor drive shaft which sets the maximum delivery pressure of the pump, and control means which acts to vary the relative volume displacement of the pump and the motor to maintain the pump delivery pressure at the maximum value determined by the setting of the accelerator. Thus, the closed loop system maintains a substantially constant maximum pressure throughout the flow range, and since the output torque of the motor drive shaft is proportional to this system pressure a true acceleration control is achieved. The relative value displacement of the pump and the motor may be influenced by the low pressure of delivery of the pump on overrun of the motor shaft and by a spring loaded braking valve adjustable by a pedal control to provide for braking of the motor drive shaft.

REFERENCES:
patent: 3186162 (1965-06-01), Pignolet et al.
patent: 3214911 (1965-11-01), Kempson
patent: 3369360 (1968-02-01), DeBiasi
patent: 3986358 (1976-10-01), Hoffmann

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