Motor vehicles – Vehicle trains – Motorized trailer
Patent
1975-06-23
1976-11-30
Song, Robert R.
Motor vehicles
Vehicle trains
Motorized trailer
180 49, 180 66R, 180 44M, B62A 5904
Patent
active
039943534
ABSTRACT:
A vehicle, such as a single truck or a truck-and-trailer combination, having a power plant, has primary ground-engaging wheels driven by the power plant and a hydraulic pump, also driven by the plant and connected by ducts to a variable-displacement motor which is mechanically coupled to drive secondary driving wheels, e.g., tandem wheels on the truck or wheels on a trailer, there being first and second ducts between the pump and motor, and the displacement of the motor can be altered to equalize substantially the pressures within the two ducts when the vehicle moves ahead on straight road affording good traction. Substantially no power is transmitted through the ducts while the vehicle moves on said road, but when one of, e.g., the primary driving wheels slips, either forwardly or backwards, hydraulic fluid is transmitted through the ducts to retard or speed-up the primary driving wheel through the pump.
REFERENCES:
patent: 3354977 (1967-11-01), Swift
patent: 3354978 (1967-11-01), Budzich
patent: 3415334 (1968-12-01), Vriend
patent: 3612202 (1971-10-01), Moom
patent: 3817341 (1974-06-01), Greene
patent: 3913697 (1975-10-01), Greene
Milmore Oswald H.
Silverstrim John P.
Song Robert R.
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