Principle of Silicone Oil Fan Clutch

1 Answers
VanKiara
07/29/25 9:15am
The working principle of the silicone oil fan clutch is relatively simple. This type of clutch uses silicone oil as the medium. When the temperature is low, the silicone oil does not flow, and the fan clutch disengages. When the temperature is high, the viscosity of the silicone oil causes the fan clutch to engage, allowing the fan to rotate. Below is a related introduction to the silicone oil fan clutch: 1. When the engine load increases and the coolant temperature rises, the temperature of the airflow passing through the radiator core also increases. The high-temperature airflow blows on the bimetallic temperature sensor, causing the bimetallic strip to deform due to heat, which drives the valve plate transmission pin and control valve plate to deflect at an angle. 2. When the temperature of the airflow blowing on the bimetallic temperature sensor drops below 35°C due to reduced engine load or other reasons, the control valve plate closes the oil inlet hole, and silicone oil no longer enters the working chamber. The silicone oil originally in the working chamber continues to return to the oil storage chamber under centrifugal force until it is completely drained. At this point, the clutch is disengaged again, and the fan idles and slips.
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