Motor vehicles – Power – Hoods
Patent
1977-03-23
1978-07-25
Peters, Jr., Joseph F.
Motor vehicles
Power
Hoods
60468, B60K 1710
Patent
active
041024257
ABSTRACT:
A vehicle includes an auxiliary front wheel drive system including fluid motors, and a valve movable to supply fluid pressure thereto for driving thereof. A second valve is included in communication with the exhaust conduits of the motors, blocking flow therethrough when the first-mentioned valve is not supplying fluid to the motors. Further a transmission is included for regulating the fluid pressure provided to the fluid motors. Another aspect includes a pressure relief valve and means for selectively varying the relief pressure of the pressure relief valve to provide proper torque characteristics to the front wheel drive system.
REFERENCES:
patent: 3522861 (1970-08-01), Middlesworth
patent: 3680652 (1972-08-01), Greene
patent: 3811525 (1974-05-01), Stuart
patent: 3902566 (1975-09-01), Bird
Haak Willard J.
Marsden Howard A.
Caterpillar Tractor Co.
Church Gene A.
Peters Jr. Joseph F.
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