To meet customers’ increasing need for better fuel economy, Dana Corp.’s Commercial Vehicle Systems group released three new ratios for its Spicer drive axle lineup. Dana’s Torsionally Tuned-40 (DST40) tandem drive axle is now available with new 2.64:1 and 2.93:1 ratios, and the S170 single drive axle now offers a 2.53:1 axle ratio. These ratios will be particularly effective in improving fuel efficiency for fleets running lower engine RPMs at cruising speed with direct transmissions and low-profile tires, the company said.
“These new axle ratios significantly improve drivetrain efficiency, which is key in optimizing fuel consumption,” said Leo Wenstrup, senior product manager – drive axles for Dana. “Fleets that specify Dana’s Spicer DST40 or S170 drive axles will quickly realize the benefits of lowered cost of operation and improved fuel efficiency when engine cruise speed is optimized.”
Wenstrup added that dimensional, metallurgical, and laboratory fatigue tests were conducted to ensure that these ratios achieve the highest levels of performance and reliability.
“The new ratios were developed using state-of-the-art design, gear cutting, and heat treatment methods to ensure our customers are getting the most technologically advanced drive axles in the industry,” said Wenstrup.
The DST40 tandem drive axle was designed to significantly reduce harmful driveline torsionals that can damage a host of drivetrain components. The axles feature a gear combination that significantly reduces excessive inter-axle driveline angles. Driveline torsional vibrations are kept well below acceptable limits in a full range of ride heights to reduce vehicle vibration and improve ride characteristics, the company said. The axle’s new ratios expand the range of standard ratios available to meet a wide variety of commercial vehicle applications. The lineup now includes 2.64, 2.93, 3.08, 3.25, 3.36, 3.55, 3.70, 3.90, 4.11, 4.33, 4.88, 5.29, 5.57, 6.17, 6.50, and 7.17.
The S170 single reduction, single drive axle is designed for truckload and LTL single and double trailer linehaul applications in 4×2 and 6×2 vehicle configurations, as well as construction, refuse, city delivery, and fire and rescue applications. Customers that specify the S170 with a tag axle, instead of the traditional 40,000-pound tandem configuration, will realize weight savings up to 400 pounds, the company said. Ratio coverage for the S170 now includes 2.53, 2.69, 2.87, 2.93, 3.07, 3.21, 3.31, 3.42, 3.58, 3.73, 3.91, 4.10, 4.30, 4.56, 4.78, 5.25, 5.38, 5.57, 6.14, 6.83, and 7.17.
For more information on Spicer axles and other Roadranger products and services, visit www.roadranger.com.