Dana Rexroth Finalizes Validation Testing on R3 HVT

Just recently, Dana Rexroth has successfully completed the final phase of validation testing of its high-fuel efficiency R3 hydromechanical variable transmission (HVT), with the beginning of production anticipated in the third quarter of this year. Moreover, the HVT R2 platform is now in production.

Both versions of the cutting-edge HVT Technology from the company sports a modular design that can be adapted for various applications, including wheel loaders, forestry skidders, reach stackers, industrial lift trucks, motor graders, wheel loaders and other off-highway equipment. The HVT R3, which extends the range of HVTs available to automakers, is specifically designed for applications with net input power from 200 to 270 kW (268 to 362 hp).

In production since late last year, the HVT R2 supports power outputs from 135 to 195 kW (180 to 260 hp), and is now included on Kalmar’s new Gloria generation of reach stackers as part of the highly efficient Kalmar K-Motion drivetrain. This drivetrain, which is developed in association with engine manufacturer Volvo Penta, is designed to reduce fuel consumption by up to 40 percent.

Diego Cornolti, head of sales and product management for Dana Rexroth Transmission Systems, said in a statement that as the need for fuel-saving technologies continues to grow, HVT power-split systems have become an ideal solution to boost fuel economy while maintaining performance. He noted that the HVTR2 has proven its value in real-world operating conditions on reach stackers through their partnership with Kalmar. “The HVT R3 will deliver these benefits to a whole new class of vehicles, expanding this technology to a wider range of power outputs.”

A result of the joint venture between Dana Holding Corp. and Bosch Rexroth, HVTs from Dana Rexroth considerably reduce fuel consumption by decreasing engine speeds throughout the duty cycle and at idle, where speeds can be dropped to as low as 650 rpm. Application analysis shows the possibility of further savings without sacrificing performance through engine downsizing.

Dana Rexroth HVTs enable accurate, responsive vehicle positioning with a stepless drive that provides enhanced acceleration while maintaining tractive effort. They enhance the diesel engine’s operating point by decoupling engine speed from drive speed. The cost of maintenance is reduced by using hydrostatic braking and wear-free directional reversing without clutches.

Dana Rexroth’s specially-designed HVT system helps reduce intricacy for equipment manufacturers, since the entire system of clutches, gears and hydrostatic units is managed by a state-of-the-art electronic control unit and optimized for efficiency by a single supplier.