Hydraulic drive system for a work vehicle or tractor

Details Hydraulic drive system for a work vehicle or tractor Hydraulic drive system for a work vehicle or tractor

1975-04-14

1976-11-02

Song, Robert R.

Motor vehicles

Power

Hoods

91176, 91210, 91478, 91481, 91482, 91492, 180 648, B60K 700, B62D 1104

Patent

active

039891178

ABSTRACT:
Each of two drive wheels on a vehicle is independently driven by a wheel motor having four single acting hydraulic cylinders. Both wheel motors are supplied by a common engine driven pump. Two forward speeds are provided by a valve arrangement which can circulate the hydraulic fluid through all four, or only two, cylinders of each motor. Valves in a pair of valve units are shifted rapidly by camshafts and snap acting mechanisms to control the motor cylinders. Reverse drive is accomplished by a timing adjustment of the camshafts. The conventional gear differential, speed change gears and reversing gears are thereby eliminated.

REFERENCES:
patent: 644598 (1900-03-01), Heggem
patent: 1645761 (1927-10-01), Le Duc
patent: 2505951 (1950-05-01), Feaster
patent: 2651377 (1953-09-01), Lapsley et al.
patent: 2681117 (1954-06-01), Marcy
patent: 3035553 (1962-05-01), Feaster
patent: 3220316 (1965-11-01), Kummerman
patent: 3485315 (1969-12-01), Bergren
patent: 3581682 (1971-06-01), Kontranowski

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