Motor vehicles – Steam traction engines – Spring mounted on axle
Patent
1977-02-23
1978-09-26
Betts, Kenneth H.
Motor vehicles
Steam traction engines
Spring mounted on axle
60421, 137112, 180 66R, B60K 1710, B60K 1734
Patent
active
041162943
ABSTRACT:
A two-axle, four-wheel-drive vehicle has separate hydraulic drive systems to drive the front and rear pairs of traction wheels. Each drive system includes a hydraulic motor that is powered by its own variable displacement pump. The torque developed by the motors, and the hydrostatic drive pressure, depend on the volume of fluid flow from the pumps. Under certain conditions, the hydrostatic drive pressure to the two motors becomes unbalanced. A torque equalizer valve is interconnected between the two hydraulic drive systems. When the equalizer valve senses a hydrostatic drive pressure difference between the two drive systems, it readjusts the displacement of the pump having the higher pressure by lowering the hydrostatic pilot pressure to restore the balance of hydrostatic drive pressures.
REFERENCES:
patent: 3641765 (1972-02-01), Hancock
patent: 3724583 (1973-04-01), Caldwell
patent: 3795107 (1974-03-01), Ward
patent: 3862668 (1975-01-01), Ward
patent: 3987626 (1976-10-01), Bianchetta
patent: 4002027 (1977-01-01), Eley
patent: 4019596 (1977-04-01), Crull
patent: 4040254 (1977-08-01), Knapp
Betts Kenneth H.
Knox William A.
Western Geophysical Company of America
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