Electric Hybrid Propulsion System

Allison Transmission
Indianapolis, IN

Allison Transmission has introduced the new eGen Force electric hybrid propulsion system for tracked combat vehicles. Designed for 50-ton tracked vehicles, the eGen Force meets the requirements for the U.S. Army’s Optionally Manned Fighting Vehicle (OMFV) program. The eGen Force is also scalable to 70-ton tracked vehicles, making it capable of meeting future Main Battle Tank requirements as well.

“This product is more than a transmission – it is a power distribution system featuring an electric motor and inverter for on-board vehicle power and parallel hybrid operation,” said Dana Pittard, Vice President, Defense Programs, Allison Transmission. “This enables engine-off mobility to reduce enemy detection – both acoustic and thermal – ideally increasing soldier survivability.”

Development of eGen Force was driven by a trade study involving existing Allison customers, who also provided input on the architecture and design of the new system. To reduce developmental risk, Allison has combined established parts from its X1100-3B1 transmission, used in the Abrams Main Battle Tank, with new components that follow proven design strategies for the gearing. The range pack utilizes eight forward and three reverse gears providing a 12 to 1 ratio coverage that generates 220 kilowatts of electrical power.

“We are very pleased with sub-system performance testing and validation,” said Michael York, Executive Director, Defense Engineering, Allison Transmission. “Currently the eGen Force has begun dyno and engine stand testing to be followed by vehicle testing in early 2023. System and vehicle level integration expertise is a core competency and differentiator for Allison, and we are proud to deliver these next generation capabilities in partnership with our defense customers.”

Upon introducing the new system, Allison has partnered with American Rheinmetall Vehicles (ARV) to integrate the eGen Force into their OMFV prototype.

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