Allison and Dana to develop CVT

A three-way strategic alliance between Allison Transmission Holdings Inc., Dana Holding Corp., and Fallbrook Technologies Inc. is working to bring a new continuously variable transmission (CVT) to the truck market before the end of the decade.

The aim of the CVT project is to boost fuel economy and vehicle efficiency while significantly reducing weight compared to a conventional transmission.

In a conference call with reporters, Lawrence Dewey – Allison’s chairman – and Roger Wood – president of Dana – said their respective companies recently signed a letter of intent to jointly manufacture transmissions for trucks and other equipment based on licenses purchased from Fallbrook to use its NuVinci CVT design.
“We’re exploring exclusively producing transmission components under this agreement,” Dana’s Wood said. “We expect it will take two to three years to optimise the technology and then ramp up to full scale manufacturing. We think we can have an off-road CVT model ready in the next three to five years, with a passenger car CVT ready by the end of the decade.”

Allison’s Dewey added that a version of the CVT based on Fallbrook’s design for medium and heavy trucks should be ready at some point within that three to eight year timeframe.

William Klehm III, chairman of Fallbrook, noted on the call that it took the last eight years to validate and develop its NuVinci CVT and he expects a working prototype designed for trucks could be ready anywhere in the next 12 to 24 months.

He explained that the key to Fallbrook’s NuVinci CVT template is the use of what he called “balls and discs” to replace the gears used in a traditional transmission. Tilting the balls changes their contact diameters and varies the speed ratio, thus providing what Klehm calls “an unlimited number of gear ratios” to optimise engine efficiency, thus improving fuel economy.

“It also means the transmission is less complex, scales and packages more easily, and costs less to manufacture – all while achieving optimum performance,” he noted.
The monetary investments by Allison and Dana for the Fallbrook licenses and engineering validation were not disclosed on the call, as Allison’s Dewey said they “did not meet U.S. reporting requirements,” though he stressed manufacturing, tooling, and prototype costs may be revealed in the future.