Allison Transmission Introduces eGen Force Hybrid Electric Propulsion System for Tracked Combat Vehicles

Allison Transmission introduced the eGen Force hybrid-electric propulsion system for tracked combat vehicles. Designed for 50-ton tracked vehicles, the eGen Force meets the requirements of the US Army’s Optionally Piloted Fighting Vehicle (OMFV) program. The eGen Force is also upgradable for 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 including an electric motor and an inverter for onboard vehicle power and parallel hybrid operation. This allows for off-engine mobility to reduce enemy detection, both acoustic and thermal, ideally increasing the survivability of the soldier.

—,Dana Pittard, Vice President, Defense Programs, Allison Transmission

Allison has combined its decades of experience with combat vehicles and hybrid-electric propulsion solutions to develop the new eGen Force system. Prior to initiating the eGen Force design, Allison leveraged the voice of the customer by conducting a comprehensive business study based on over 70 years of cross-drive development to select the optimal architecture for a hybrid combat vehicle. to optimize efficiency, performance, reliability and manufacturability.


Engine power 850kW / 1140hp
Lenght 1575mm / 62in
Length 1091mm / 43in
Height 955mm / 37.6in
Dry weight
Vehicle weight 36-55 tons
Gear 8 forward, 3 backward
Mechanical report 11.9:1
PTO options Mechanical or electric optional
On-board vehicle power 220 kW at 600 V DC
eMachine 600V system
Drive-By-Wire compatible Yes

To reduce development 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 gearing. The high-output range pack uses eight forward gears and three reverse gears providing efficient 12:1 ratio coverage and generates 220 kilowatts of electric power.

We are very satisfied with the testing and validation of the performance of the subsystems. Currently, eGen Force has commenced test bed and engine bench testing, followed by vehicle testing in early 2023. System and vehicle level integration expertise is a core competency and a differentiator for Allison, and we are proud to deliver these next-generation capabilities in partnership with our defense customers. .

—Michael York, Executive Director, Defense Engineering, Allison Transmission

Allison is partnering with American Rheinmetall Vehicles (ARV) to integrate the eGen Force into their OMFV offering. The ARV vehicle offers best-in-class mobility and unparalleled power in a modern, highly maneuverable chassis that will transform the way soldiers and squads accomplish their mission.

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