Eaton Develops 2-Speed Transmission for Electric Vehicle Application

Eaton has developed a 2-speed transmission which will be used as part of the UQM PowerPhaseDT system for electric vehicles.

2 speed transmission with UQM Power Pack 58066ce1af4ef
Logo Eaton 10933210

Power management company Eaton has developed a 2-speed transmission for heavy- and medium-duty electric commercial vehicle applications to meet growing demand in the European and other markets. The product will be in full production this Fall and was on display at the 66th IAA Commercial Vehicles Show.

Eaton has partnered with UQM Technologies Inc., based in Longmont, CO, and Pi Innovo, based in Plymouth, MI, to design and produce the “UQM PowerPhaseDT” system. Eaton has developed and will supply to UQM a 2-speed transmission for an electric vehicle (EV) application, and Pi Innovo will develop and supply to UQM the transmission control unit. Together, the components will be combined with UQM’s current PowerPhase HD220/HD250 motor and inverter system to create the UQM PowerPhase DT, which is a full-electric drive system.

“We are very pleased to partner with UQM and Pi Innovo for this joint project,” says Marco Rollero, Director, Sales and Marketing, Eaton’s Vehicle Group, Europe, Middle East, Africa (EMEA). “Eaton is striving to deliver value to its customers, and this new full-electric drive system is an example of this commitment. It will help vehicle manufacturers meet new regulatory requirements while ensuring the most efficient use of natural resources.”

The system will allow customers in the medium- and heavy-duty EV commercial markets to achieve increased performance in areas of grade performance, acceleration and efficiency. Eaton’s 2-speed transmission provides a greater speed and torque range which allows a smaller electric motor to power large vehicles. The smaller drivetrain also allows for improved packaging efficiency, greater payload capacity, and lower cost when compared with direct drive or single speed drivetrain strategies. 

In addition, the 2-speed transmission keeps the electric motor operating in the highest efficiency region for a greater portion of the drive cycle. Combined with the high efficiency of the “UQM PowerPhaseDT” electric drive system, customers will achieve higher overall vehicle efficiency, save on the cost of batteries, and increase the driving range of their vehicles.

The development and production of a full-electric drive system supports the overarching need for full transmission systems, as enhanced performance and efficiency requirements are mandated by customer drive cycle needs coupled with the need to reduce battery costs while meeting more stringent regulatory requirements.