Volvo Trucks is making fuel-efficiency improvements, including a new XE – eXceptional Efficiency – powertrain package for linehaul applications.
Like Volvo’s other XE packages, XE super direct drive improves fuel efficiency by lowering engine rpms at a given vehicle speed – a concept Volvo calls “downspeeding.” By using a direct drive Volvo I-Shift automated manual transmission, the new package offers additional fuel efficiency benefits compared with conventional direct drive transmissions.
“Volvo Trucks is intensely focused on continual improvement in the key areas that drive our customers’ success, and nothing affects the bottom line more than fuel efficiency,” said Göran Nyberg, president of Volvo Trucks North America. “However, we understand that all customers are not the same. In addition to improvements like aerodynamic upgrades that help a wide segment of the industry, we have worked closely with our customers to develop powertrain options and other solutions that benefit specific applications.”
Additionally, model year 2016 aerodynamic and underhood improvements increase fuel efficiency by up to 3.5 percent, depending on model, the company said.
XE super direct drive, which will be available for order mid-year, is designed for linehaul applications that operate in top gear at a gross combination weight rating of 80,000 pounds or less with maximum engine torque of 1,850 lb.-ft.
XE super direct drive incorporates Meritor’s new super-fast 2.28 ratio for its 14X tandem drive axle and RPL35 driveline. While Meritor’s existing 14X tandem is designed to handle higher torques, Meritor has fortified the design by enlarging the pinion system to accommodate extreme torque levels associated with downspeeding. The 2.28 axle ratio and driveline engineered for downspeeding ensure that torque is transmitted evenly throughout the drivetrain.
A 2.47 rear axle ratio with a direct drive transmission amounts to 1,370 rpm at 65 miles per hour. A 2.28 rear axle ratio equals 1,265 rpm at the same speed. The 105 less rpm between the two equates to an approximate 1.5 percent improvement in fuel efficiency.
XE super direct drive is the latest option in Volvo’s evolution of XE powertrains optimized for efficiency and performance. Earlier this year, Volvo launched an online tool at www.volvotrucks.us.com/torque to help customers select the best torque package by answering just a few questions about their operation.