Earth working – Automatic power control – Motive power control
Patent
1980-06-02
1985-10-29
Brust, Joseph Paul
Earth working
Automatic power control
Motive power control
172 9, 172 12, 180 648, 280446R, A01B 6700, A01B 63112
Patent
active
045496102
ABSTRACT:
An agricultural tractor having six wheels which are each hydraulically drivable by individual hydraulic motors through hydraulic fluid supplied by respective hydraulic pumps. With each pump driving only one wheel, skidding of a wheel does not affect drive to other wheels. The pumps are all driven by a single engine. Selectively operable automatic control means control the speed of the wheels when, for example, the tractor is turning. Control means are also responsive to the drag resistance of an implement hitched to the tractor's lifting members and cause such lifting members to raise when the implement's resistance exceeds a predetermined limit. In addition, speed of the vehicle is automatically reduced by reason of such resistance and, further, the position of the implement relative to the ground may be adjusted to offset at the location of the implement upward and downward movement of tandem wheel pairs at the rear of the tractor. Such adjustment is effected by the lifting device and is delayed for a short period to allow movement of the vehicle.
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