Underspeed actuator with part throttle control

Details Underspeed actuator with part throttle control Underspeed actuator with part throttle control

1975-02-20

1976-12-14

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

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

60444, 60447, 60488, 60486, F16H 3946

Patent

active

039967433

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 for determining instant operating conditions for the transmission. In order to automatically regulate displacement of each pump unit in response to prime mover speed, an underspeed actuator valve unit includes a piston which is hydraulically responsive to the differential pressure in order to adjust operation of a lever which controls displacement of the pump unit. A part throttle control valve prevents the underspeed actuator from reducing displacement of the pump unit when speed of the prime mover is reduced by a manual throttle control.

REFERENCES:
patent: 3228184 (1966-01-01), Harbidge et al.
patent: 3477225 (1969-11-01), Cryder et al.
patent: 3528243 (1970-09-01), Cryder et al.
patent: 3785754 (1974-01-01), Miller

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