The fan drive helps pull air in through the radiator to cool the engine. Truck engines can become very hot , especially when trucks are idling, like in a traffic jam. It's essential to cool down the engine before it overheats, or the engine could sustain significant and incredibly expensive damage.
The goal of this part is to provide the electrical connection between the valve and the ECU. The clutch is actuated based on the fan speed signal, which is sent to the ECU -- this includes the spinning flux ring Horizon produces. The video above shows the magnetic and flux current and how it operates the valve.
Viscous fan drives not only perform the essential cooling service of a fan drive, but also operate at variable speeds. This gives them a competitive advantage over fixed fan drives.
Viscous fan drives engage and disengage less frequently than their fixed-speed counterparts, which:. What's more, viscous fan drives actually delivers power to the engine, saving fuel mileage and reducing wear and tear on the engine. With more efficient use of fuel and less wear and tear come reduced maintenance, so the financial savings add up quickly.
In a viscous drive, the main shaft turns at RPM proportional to the engine speed, while the drive housing attached to the engine fan maintains a separate speed, set by the electronic engine control module. The fan drive's valve, clutch, and fluid reservoir all spin together, which puts less drag on the engine. Even better, the cooling fan in a viscous drive can vary its speed to meet precise engine cooling requirements and cooling system temperature.
A fixed fan can only run at one speed. The fan speed signal and clutch allow for precise engine coolant and charged air adjustments, improving efficiency. The valve arm opens to push silicone oil in to the working chamber. As the silicone oil flows between the input and output clutch plates, it creates shear forces. This gradual buildup forces the two plates to spin at similar speeds, thus allowing a smooth change in the fan speed.
Check the assembly for leaks through the seams and around the shaft. They also have a thermostatic spring. Check it by releasing it from its seat and measuring the distance between the spring and its retainer. Always check for manufacturer's specifications for any special procedures. Study Tips Feedback. Farmers, construction workers and miners all use diesel fuel to get their job done.
That means a more comfortable experience for an operator. Engine fans are one of the largest sources of noise on a vehicle, so increasing noise emissions rules are a large driver for adoption of viscous cooling technology in Europe. Every time an internal combustion engine runs, particulate matter is created as a biproduct of the engine cycle.
But proper cooling can limit it and thus significantly decrease carbon emissions. Some long-haul applications see their drive disengaged up to 90 percent of the time, so they still benefit from an on-off drive.
Five reasons to consider a viscous fan clutch in your next application October 9, Here are five reasons why: 1. That has a bevy of benefits. The lower a fan drive runs, the less noise it creates. Viscous fan drives are just plain better for the environment.
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