Motor vehicles – Steering by driving – Independently operable drive motors
Patent
1991-01-16
1992-08-11
Hill, Mitchell J.
Motor vehicles
Steering by driving
Independently operable drive motors
56DIG11, 60428, 180 191, 180 193, 180 534, 180242, 180305, 180307, 180308, B62D 1100
Patent
active
051371006
ABSTRACT:
A hydrostatic transmission for a vehicle, such as a commercial walk-behind mower, comprises a fixed displacement pump, first and second reversible hydraulic motors for driving first and second ground engageable wheels, respectively, of the vehicle, and first and second spool valves for controlling hydraulic fluid flow from the fixed displacement hydraulic pump to the first and second hydraulic motors, respectively. The transmission may have a further fixed displacement hydraulic pump arranged in tandem with the first mentioned pump, a fluid pressure operated device and a third spool valve movable between a first position in which hydraulic fluid from the further pump is supplied to the pressure operated device and a second position in which hydraulic fluid from the further pump is supplied to the first and second spool valves to supplement hydraulic fluid from the first mentioned hydraulic pump.
REFERENCES:
patent: 2766834 (1956-10-01), Boyer
patent: 3024858 (1962-03-01), Davis et al.
patent: 3279637 (1966-10-01), Olson et al.
patent: 3422917 (1969-01-01), Guinot
patent: 3656570 (1972-04-01), Gortnar et al.
patent: 3916767 (1975-11-01), Barton
patent: 4355693 (1982-10-01), Hirooka et al.
patent: 4804016 (1989-02-01), Novacek et al.
Scott Graham
Toogood Graham J.
Hill Mitchell J.
Ultra Hydraulics Limited
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