BorgWarner introduces K32 two-speed fan drive conversion

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Overdrive / March 25, 2015

Building on the popularity of its on-off fan drive, the K32, BorgWarner’s two-speed variant will be available in April as an option from truck manufacturers as well as a conversion kit for operators current utilizing the on-off clutch. Applicable mostly for vocational and/or stop and go applications, where frequent engagement of the on-off clutch could lead to excessive wear of components, the K32 Durospeed boosts disengaged speed for greater cooling effect when not at full engagement.

Today, noted BorgWarner Account Manager Lance Wildman, on-off or variable speed fan drives (like the BW Vistronic variable) in linehaul and vocational applications are quite common. Two-speed drives, however, Wildman expects, will dominate vocational applications within the next five years, given the elevated cooling you get when disengaged.

Built on the back of the K32 on-off, which Livingston described as “industry standard” in the on-off realm, the K32 Durospeed is made in the United States and built for ease of maintenance. Line and seal service kits are available for regular service. Conversion from any of BorgWarner’s “on-off fan drives that are in the field today” is a relatively simple matter, he added.

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BorgWarner introduces DuroSpeed 2-speed fan drive

Durable, modular, light-weight; for vocational, off-highway applications

Fleet Owner / March 25, 2015

BorgWarner’s new DuroSpeed 2-speed fan drive is specifically designed to deliver reliable cooling for severe operating and vocational truck applications such as construction vehicles and municipal trucks.

While on/off models provide superb durability and fuel efficiency for over-the-road applications, BorgWarner’s DuroSpeed fan drive significantly reduces fan engagements for greater reliability and less noise in severe service applications, the company says.

The modular design allows any BorgWarner Kysor on/off fan drive to be easily converted to a DuroSpeed fan drive. BorgWarner will begin supplying this product in May 2015.

“Dump trucks, refuse haulers and other vocational applications experience severe service and have very different cooling needs than line haul trucks. At BorgWarner, our engineers listened to the voice of the customer to develop a simple, efficient design built for durability and serviceability,” said Daniel Paterra, president and GM, BorgWarner Thermal Systems. “Our testing shows the DuroSpeed fan drive’s innovative flux ring design enables this clutch to run 70 degrees Fahrenheit cooler than competitive offerings. The cooler internal operating temperature increases bearing and liner durability, allowing nearly twice as many engagements over its lifetime.”

In severe-duty applications, on/off fan drives are continually engaging and disengaging. When disengaged, engine temperatures rise quickly, causing the clutch to engage repeatedly.

BorgWarner’s pneumatically actuated DuroSpeed 2-speed fan drive, however, is designed with a higher disengaged fan speed to prevent engine temperatures from rising too quickly. Because the fan drive engages and disengages less often, clutch life increases, noise decreases, dust buildup in the radiator is minimized and more horsepower is available, allowing the vehicle to achieve higher work output.

Compared with competitive models, the DuroSpeed fan drive has no spinning air connections to wear, inspect or service, and is designed to operate at lower temperatures for longer bearing and liner life.

Weighing 5 to 10 pounds less and using 11 fewer components than comparable units, BorgWarner’s DuroSpeed fan drive also helps deliver better fuel economy.

To reduce complexity and minimize upgrade costs, BorgWarner’s modular design uses the same clutch unit for all applications. Any Kysor on/off fan drive can be easily retrofitted to a DuroSpeed fan drive with a conversion kit consisting of only two add-on components.

BorgWarner’s new DuroSpeed 2-speed fan drive significantly reduces fan engagements for less noise and longer durability