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Time：2021-11-26Views：0
With the upgrading of diesel vehicles, the requirements for noise and power loss emitted by the engine cooling system are getting higher and higher. The cooling fans currently used in the cooling system are divided into engine-driven fans and motor-driven fans according to the start-up form. The motor-driven fan, as the name suggests, uses the motor to drive the fan to rotate, and the ECU controls the relay to turn the fan on and off. This kind of fan only consumes electrical energy, but the wiring is complicated and the cost is high.
Engine-driven fans are divided into direct-drive fans, electromagnetic clutch fans, and silicone oil fans. Direct drive fans use belts to directly drive the fan to rotate. This kind of fan rotates in real time to increase engine power consumption. The electromagnetic clutch fan adds an electromagnetic clutch on the basis of the direct drive fan, and the ECU controls the opening and separation of the clutch to realize the operation and disconnection of the fan. The silicone oil fan controls the flow of silicone oil and realizes the opening and closing of the fan. It has the characteristics of simple structure, low cost and good stability, so the silicone oil clutch fan is widely used in the engine cooling system.
The silicone oil fan clutch uses silicone oil as the medium and uses the high viscosity of silicone oil to transmit torque. The temperature of the air behind the radiator is used to automatically control the disengagement and engagement of the fan clutch through a temperature sensor. When the temperature is low, the silicone oil does not flow, the fan clutch is disengaged, and the fan speed slows down, basically idling. When the temperature is high, the viscosity of the silicone oil causes the fan clutch to be combined, so the fan and the water pump shaft rotate together to regulate the temperature of the engine.
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