Power plants – Pressure fluid source and motor – Having plural energy input means – pumps or diverse pump outlets
Patent
1975-11-19
1976-12-07
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Having plural energy input means, pumps or diverse pump outlets
180 648, 74480R, F15B 1309
Patent
active
039954269
ABSTRACT:
The invention is concerned with an improved mechanical arrangement for controlling the steering and speed function of a hydrostatic control system for a ground driven vehicle. Such a control system comprises a pair of hydrostatic pumps each controlled by a rotatable arm extending from a servo valve mounted thereon along with a pair of hydrostatic motors each driven by a respective one of the pumps and a pair of ground engaging means each on respective sides of the vehicle. The improvement of the invention comprises a pair of pump adjusting means, one for each of the pumps, comprising a first crank having a first end and a second end, pivotally mounted intermediate said ends adjacent a respective one of the pumps; a steering linkage pivotally mounted adjacent the first end of the first crank; a connecting link pivotally mounted adjacent a first end thereof adjacent the second end of the first crank; a first linear member pivotally mounted adjacent its first end adjacent a second end of the connecting link and pivotally mounted adjacent its second end to the arm of the servo valve; a second linear member pivotally mounted adjacent its first end adjacent the first end of the first member and the second end of the connecting link and a second crank pivotally mounted adjacent its first end adjacent a second end of the second member. The improvement further includes tying means pivotally mounted adjacent a second end of each of the second cranks directly linking their movement.
REFERENCES:
patent: 3500633 (1970-03-01), Livezey
patent: 3504493 (1970-04-01), Potter et al.
patent: 3898811 (1975-08-01), Seaberg
Caterpillar Tractor Co.
Geoghegan Edgar W.
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