Vehicle hydraulic drive system

Motor vehicles – With fluid or mechanical means to accumulate energy to power...

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180308, 60413, B60K 100

Patent

active

042405157

ABSTRACT:
A vehicle hydraulic drive system in accordance with the present invention provides an energy efficient system that produces a variable drive "effect" without the use of traction drives or variable displacement hydraulics. The system includes an engine powered hydraulic pump adapted to supply pressurized hydraulic fluid to a hydraulic accumulator and through a propulsion control valve to hydraulic wheel-motor and vehicle speed-control circuits. The valve, when in a forward thrust position, delivers hydraulic fluid in unrestricted flow at full system pressure from the accumulator and the hydraulic pump to the wheel-motors to accelerate the vehicle in the forward direction to a predetermined upper speed-limit, e.g. 55 mph (88.5 kmh). When this upper speed-limit is attained, the speed regulating circuit shifts the propulsion valve to a neutral position to separate the flow of hydraulic fluid to the wheel-motors. The vehicle then "coasts" while the engine continues to drive the hydraulic pump to recharge the accumulator. When the frictional forces on the vehicle cause its speed to drop from the upper limit to a predetermined lower limit, e.g. 54 mph (86.9 kmh), the speed regulating circuit shifts the propulsion valve to the forward thrust position to re-accelerate the vehicle to the upper limit using hydraulic fluid from the accumulator, which was recharged during the "coasting" period, and the hydraulic pump.

REFERENCES:
patent: 2678106 (1954-05-01), Vonderheide
patent: 3092970 (1963-06-01), Sampietro
patent: 3153900 (1964-10-01), Pigeroulet et al.
patent: 3891045 (1975-06-01), Pancella
patent: 3903696 (1975-09-01), Carman
patent: 3910043 (1975-10-01), Clerk
patent: 4132283 (1979-01-01), McCurry
"Measurement of Fluid Flow Rate", Mechanical Engineers Handbook, ed. T. Baumeister, 1958, pp. 16-19.

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