Horton Inc. has introduced Arctis two-speed fan drives for medium-duty trucks, buses, severe-service vehicles, rear-engine cement mixers and other on- and off-highway equipment with little to no ram air.
The company said the Arctis line provides the highest torque available from Horton: 2,700 in.-lbs. (305 N-m) in its two-speed technology.
Horton noted that in most conditions, the two-speed fan drive is powered by eddy current, turning the fan at a lower speed, reducing operating noise and increasing available horsepower for auxiliary systems. When the vehicle needs more cooling, the fan drive springs actuate to run the fan at full input speed. Because the eddy current mode provides sufficient cooling in most operating conditions, full-speed fan operation is reduced by 85%, according to Horton. This improves fuel economy, reduces operating noise and increases available horsepower, the manufacturer added. Fewer fan engagement cycles also improve fan drive, belt and tensioner reliability while minimizing radiator abrasion from dust and debris.
The manufacturer said the two-speed fan drives also feature a high-torque clutch pack to drive larger fans at higher ratios and a larger air chamber for full disengagement.