Hydrostatic transmission control

Power plants – Pressure fluid source and motor – Having condition responsive control in a system of distinct...

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60428, 60490, 180 63, 180 648, F16H 3946

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active

039465608

ABSTRACT:
A hydrostatic transmission control for a hydrostatic transmission having a variable displacement pump and a variable displacement motor including pressure-responsive displacement control means for the pump and motor with a displacement control valve for each of the pump and motor and positionable by a control pressure to set the displacement of the pump or motor with which it is associated. In dual path control of two hydrostatic transmissions, a master circuit has a first valve for setting a control pressure to determine the speed of operation of the transmissions and a second valve for determining the direction of operation of the transmissions, with operation of both valves by a single control handle. The master circuit connects into two branch circuits, each leading to the displacement controls for one of the hydrostatic transmissions and with each branch circuit having its own steering control valve. The steering operation is controlled by an additional pair of handles associated one with each of the pair of steering control valves. Each of the steering control valves provides for a reduction in a control pressure for reduced speed of the associated hydrostatic transmission or reversal of flow of control pressure fluid to obtain the reverse direction of operation of one of the transmissions.

REFERENCES:
patent: 2651377 (1953-09-01), Lapsley et al.
patent: 2774434 (1956-12-01), Ferris
patent: 3677362 (1972-07-01), Chatterjea
patent: 3727402 (1973-04-01), Keith et al.
patent: 3795109 (1974-03-01), Bojas et al.

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