Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1975-02-20
1976-04-27
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60447, 60465, F16H 3946
Patent
active
039525147
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 together with a venturi manifold which function together to normally establish a selected pressure differential in a pair of supply conduits for determining instant operating conditions for the transmission. In order to automatically regulate displacement of each pump unit in response to engine or prime mover speed as determined by load conditions, an underspeed actuator valve unit includes a piston which is hydraulically responsive to the differential pressure in order to adjust the effective moment arm for a lever which controls displacement of the pump unit. Preferably, the piston is acted upon by a variable rate spring means for improved stability with the speed control and vent valve assembly being manually operable into an override mode for overcoming the effect of the differential pressure upon the underspeed actuator valve and terminating or reducing torque transmission.
REFERENCES:
patent: 3054263 (1962-09-01), Budzich et al.
patent: 3371479 (1968-03-01), Yapp et al.
patent: 3477225 (1969-11-01), Cryder et al.
patent: 3528243 (1970-09-01), Cryder et al.
patent: 3727628 (1973-04-01), Habiger et al.
Caterpillar Tractor Co.
Geoghegan Edgar W.
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