Diesel-Electric Drive For Oshkosh’s Next Generation Tactical Truck

Posted on February 16, 2005
Oshkosh Truck Corp. said it has developed the next generation of its Heavy Expanded Mobility Tactical Truck (HEMTT) for the U.S. Army. Known as the HEMTT A3, this third-generation design features a hybrid-electric drive, an enhanced load handling system and independent suspension. Oshkosh said the HEMTT A3 is the first production-ready tactical defense vehicle to feature a diesel-electric drive system known as ProPulse technology. This system not only increases fuel economy by at least 20 percent, but also allows the vehicle to export up to 200 kilowatts of AC power, helping reduce the U.S. Army's requirements for separate generators to power field hospitals, airfields and command centers, Oshkosh said.

The HEMTT A3 is designed to allow logistics support battalions to keep pace with combat troops led by the armored and highly mobile Stryker combat vehicles. Oshkosh's TAK-4 independent suspension allows the HEMTT A3 to travel faster over difficult terrain. The HEMTT A3 is also designed to unload cargo from a C-130 aircraft without the assistance of material handling equipment.

Electric-motor-driven axles provide the truck with capabilities that meet or exceed those of earlier HEMTT configurations, Oshkosh said. This version can climb a 60 percent grade while carrying a full payload. And, it is a full 3000 pounds lighter than its predecessor while maintaining a 13-ton payload capacity and improving reliability through the use of lightweight, high-strength materials. This allows the new truck to carry cargo while in transit on a C-130 aircraft, a first for the HEMTT line.

Oshkosh said the power pack module can be removed and replaced in less than 30 minutes, and common axle and suspension modules reduce replacement parts stocking requirements. Improved local diagnostics that allow the operator to access vital vehicle information -- via laptop, on-board display screens or hand-held, personal digital devices - to repair or troubleshoot the vehicle. Built-in diagnostic software allows maintenance personnel to pinpoint problem areas within minutes, and can even e-mail this information anywhere in the world.