Internal-combustion engines – Cooling – Automatic coolant flow control
Patent
1978-02-16
1980-09-23
Burns, Wendell E.
Internal-combustion engines
Cooling
Automatic coolant flow control
123 4112, 123 4149, 60329, 60403, 60456, 60DIG5, 236 35, F01P 702, F16D 3102
Patent
active
042236460
ABSTRACT:
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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Plessey Hydraulics, Publication No. 5500, Jun. 1976.
"Fan Clutches: A Must for Heavy Trucks?," Automotive Engineering Magazine Apr. 1975.
Burns Wendell E.
TRW Inc.
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