Fan drive, particularly for cooling installation of vehicles

Details Fan drive, particularly for cooling installation of vehicles Fan drive, particularly for cooling installation of vehicles

1984-11-16

1986-02-18

Tapolcai, William E.

Automatic temperature and humidity regulation

Cooling radiator

Air control

91419, 91452, 165 39, 251 44, 417 46, F01P 702

Patent

active

045708495

ABSTRACT:
Disclosed is a fan drive, in particular one for cooling installations of rail vehicles. The fan drive comprises a hydraulic motor and a control valve which regulates a bypass as a function of temperature, thus affecting the flow of a pressure medium driving the motor. The control valve comprises a control piston subjected to a control pressure in the direction of closing the bypass, and a counterbalancing pressure in the opposite direction from the source of the pressure medium. The control valve also comprises a control spring which biases the control piston in the direction of closing the valve, and a pilot valve which affects the control pressure. The pilot valve is actuated by an electromechanical servo component. The pilot valve is located in an insert which is arranged within the control piston. A central bore of the control piston is slidingly guided on the convex surface of the insert so as to form a seal.

REFERENCES:
patent: 2673706 (1954-03-01), Matteson
patent: 2758811 (1956-08-01), Peterson
patent: 2893680 (1959-07-01), Freund
patent: 3118648 (1964-01-01), Campbell
patent: 3198204 (1965-08-01), Parks
patent: 3297047 (1967-01-01), Sime
patent: 3415269 (1968-12-01), Salerno
patent: 3664129 (1972-05-01), Schwab
patent: 4009860 (1977-03-01), Lingnau
patent: 4065052 (1977-12-01), Ridenour
patent: 4283009 (1981-08-01), Deem

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