Hydrostatic transmission control system

Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement

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60494, F16H 3946

Patent

active

039642623

ABSTRACT:
An improvement in a control system, including a brake device, for a vehicle having a hydrostatic transmission which includes a hydrostatic pump and a hydrostatic motor. The hydraulic control circuit includes a control pump, a high pressure conduit, a low pressure conduit, differential pressure regulator valve means and a directional control valve means interposed in the high and low pressure conduits and a fixed orifice means interposed in the low pressure conduit upstream from the differential pressure regulator valve. The improvement takes the form of an adjustable orifice means interposed in a branch conduit, between the high and low pressure control conduits downstream from the fixed orifice means, with the adjustable orifice means permitting the adjustment of the pressure differential between the high and low pressure control conduits.

REFERENCES:
patent: 3054263 (1962-09-01), Budzich et al.
patent: 3143127 (1964-08-01), Frost
patent: R28113 (1974-08-01), Howard et al.

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