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 viscous clutch |
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Founded in 1998, China Kaide Car Parts Co., Ltd. is a viscous clutch manufacturer and supplier of car parts and accessories. We can provide our customers with high quality auto spare parts and qualified auto performance parts for many kinds of cars, buses, and trucks. It has years of OES and OEM viscous clutches experiences and passed the TUV certification of ISO/TS16949 quality system. We have introduced advanced technology and equipment to integrate further development and manufacture. |
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viscous clutches Show |
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1. The Rover SD1 Efi Viscous Fan Coupling (Clutch Fan) uses the unique properties of a silicone oil whose viscosity changes both with sheer force and temperature. A grooved wheel (fixed to the water pump) rotates within a grooved housing (fixed to fan blades) and the oil is forced to move within and between the revolving grooves. The larger the speed differential between oil layers in the wheel and housing the greater the sheer forces which raise the temperature and viscosity of the oil. The increased bond between the two causes the fan to rotate faster increasing airflow through the radiator. As speed difference falls, sheer forces and oil temperature fall, the oil gets thinner, the driving force lessens and fan speed stabilises. For Efi cars a forward facing bimetal coil senses the airflow coming from the radiator. Heat causes the coil to turn a shaft which operates an internal control valve regulating the volume of oil which is able to flow between the grooves. Thus hotter air allows more fluid to enter the grooves resulting in a stronger bond between wheel and housing giving higher fan speed and increased cooling. |
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2. The first of two fail conditions is when the fan does not speed up due to insufficient bond between the wheel and the housing resulting in overheating especially in slow traffic, urban driving, towing or running air-con. Lightly loaded at normal driving speed there is sufficient air passing through the radiator to cool the engine. There are three reasons for such failure. Faulty bimetal coil, oil control shaft/valve siezed, or loss of oil. A simple check is to press a rolled newspaper against the fan blades when a hot engine is idling. If the fan can be slowed or stopped it is probably faulty. A second fail condition when the fan becomes permanently locked is potentially very serious. Because the grooves are thin they can break due to age, internal corrosion, vibration, etc, with debris jamming between wheel and housing resulting in an over speed fan. The air roars loudly and continously, more so at high engine speeds and such a condition may result in a thrown fan blade, resulting in severe imbalance and further breakage. If this happens broken parts are projected forwards into the radiator. Never drive a car with a locked-up viscous fan. |
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