Dana Rexroth plans second powersplit transmission
By Helen Wright17 April 2012
After showcasing the first fruits of their partnership at Intermat in the form of the HVT R3 powersplit transmission, the joint venture between Dana and Bosch Rexroth confirmed that is developing a second powersplit transmission for off-highway machines, the HVT R2.
The new drive systems contain both hydrostatic and torque converter drives - the hydrostatic drive is used at low speeds, where it is at its most efficient. As speed increases, the torque converter transmission comes into operation.
The HVT R3, which is designed for off-highway applications requiring up to 256 kW, is said to deliver 20% fuel savings compared to a traditional torque converter. The HVT R2 is planned to meet the demands of lower rated engines.
Jeroen Decleer general manager at Dana Rexroth, said the joint venture represented a meeting of complementary knowledge.
"The development phase of the HVT has been very positive - we have tested the HVT R3 on wheeled loaders and have produced great results. Powersplit transmissions are also being introduced elsewhere in the industry by major manufacturers, and this is helping to promote knowledge in the market."
The increased efficiency of powersplit transmissions means a smaller engine could be used in any given vehicle, and there are also reduced maintenance costs thanks to braking via the hydrostatic system.
"In the medium- to long-term, I would also expect to see powersplit transmissions used on smaller machines like telehandlers and other compact equipment. Perhaps in the next five years," Mr Decleer said.