Hydraulic fan drive system

Details Hydraulic fan drive system Hydraulic fan drive system

F - Mech Eng,Light,Heat,Weapons

16

H

138/41.11

F16H 39/02 (2006.01) F01P 5/04 (2006.01) F16D 31/04 (2006.01) F16H 61/40 (2006.01)

Patent

CA 1139637

ABSTRACT OF THE DISCLOSURE A hydraulic motor drives the cooling fan of an internal combustion engine. Fluid flow from a fixed displacement pump is directed through a pilot-operated pressure-compensated control valve to the hydraulic motor. The valve has a continuous bias to a fan-on position for directing fluid to the fan motor. Flow to the fan motor is diverted by the valve as a function of the pressure of the fluid in the system. In addition, flow to the fan motor is diverted as a function of a pilot pressure signal which is controlled by the temperature of the engine coolant fluid. The valve failsafes to a condition directing maximum flow to the fan motor in the event of loss of pilot fluid pressure.

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