Speed and load responsive underspeed actuator for hydrostatic tr

Details Speed and load responsive underspeed actuator for hydrostatic tr Speed and load responsive underspeed actuator for hydrostatic tr

1975-02-20

1976-04-27

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60465, 60488, F16H 3946

Patent

active

039525155

ABSTRACT:
A hydrostatic unit of the type contemplated by the present invention includes one or more pump and motor combinations interconnected by means of a conventional closed loop. Controls for the hydrostatic unit include a speed control and vent valve assembly as well as a venturi manifold which functions to normally establish a selected pressure differential in a pair of supply conduits. In order to automatically regulate displacement of each pump unit in response to both engine or prime mover speed and instant load conditions, an underspeed actuator valve unit is hydraulically responsive to the differential pressure in the two conduits and also to changes in output pressure developed by the pump unit.

REFERENCES:
patent: 3054263 (1962-09-01), Budzich et al.
patent: 3477225 (1969-11-01), Cryder et al.
patent: 3526288 (1970-09-01), Cryder et al.
patent: 3528243 (1970-09-01), Cryder et al.
patent: 3891354 (1975-06-01), Bosch

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