| 摘要 |
PURPOSE: A vehicle cooling fan is provided to improve cooling efficiency of a radiator, and to reduce manufacturing costs. CONSTITUTION: A cooling fan comprises a rotating member(1) interlocking with a driving shaft(56); a transmission unit transmitting a driving force of the rotating member to a fan(F) by a magnetic field; and a case fixed in a body inserting a roller(2) of the rotating member, and supporting the driving shaft. Power is supplied to the roller by data corresponding to a signal in transmitting a temperature signal to an ECU(Electronic Control Unit)(7). The magnetic field is formed with applying power to a coil(8) of a first magnetic substance(4) in supplying power to the roller, and induced to a second magnetic substance(5) to rotate the fan. The fan is turned with operating the magnetic field between first and second magnetic substances as constraining force of the fan. The rotational speed of the fan is decided according to the constraining force of the magnetic field and the rotational speed of the driving shaft. The ECU reduces current in decreasing temperature of air through a radiator by coolant, and the fan rotates at a low speed by lowering intensity of the magnetic field between the magnetic substances.
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