Fluid drive system

Details Fluid drive system Fluid drive system

1980-07-15

1983-01-25

Mitchell, David M.

Motor vehicles

Special wheel base

Having only three wheels

60421, 180 63, 180 648, 180242, 417218, B60K 1710, F15B 1800

Patent

active

043698557

ABSTRACT:
A hydraulic fluid drive for a land motor vehicle having front and rear drive wheels. An internal combustion engine drives a pair of positive displacement pumps. A first pump is connected to hydraulic motors that drive the front wheels of the vehicle. A second pump is connected to a hydraulic motor that drives a rear steerable wheel of the vehicle. A manually operated control is used to adjust the speed and torque of the motors for the front wheels. A front and rear wheel drive equalizing control operates in response to differences in hydraulic fluid pressure supplied to the front and rear hydraulic motors to equalize the fluid pressure pumped to the front and rear hydraulic motors so as to maintain the torque and speed of the front and rear wheels substantially constant. A foot operated lever is used to operate the control for the first pump for changing the supply of fluid pressure to the front wheel motors. The control apparatus includes a piston and cylinder assembly that interconnects the controls for the first and second pumps to control the second pumps in response to the hydraulic fluid output pressure of the first pump.

REFERENCES:
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patent: 2651377 (1953-09-01), Lapsley et al.
patent: 2949971 (1960-08-01), Cline
patent: 3156313 (1964-11-01), Peterson
patent: 3234856 (1966-02-01), Martin
patent: 3246715 (1966-04-01), Pool et al.
patent: 3469381 (1969-09-01), Burrough et al.
patent: 3576106 (1971-04-01), Nowicki
patent: 3727929 (1973-04-01), Kieth et al.
patent: 3789929 (1974-02-01), Leidig
patent: 3901339 (1975-08-01), Williamson
patent: 3963084 (1976-06-01), Misan
patent: 4116294 (1978-09-01), Johnston
patent: 4167853 (1979-09-01), Hamma et al.

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