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Eaton to launch a purpose-built, heavy-duty Transmission for Commercial EVs

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Power management company Eaton announced that its eMobility business will launch an all-new 4-speed transmission for heavy-duty electric commercial vehicles to meet growing demand in a number of segments, including pickup and delivery and port drayage in North America, China and Europe.

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The new transmission, designed for Class 7 and 8 commercial vehicles, is currently in the testing phase with major OEMs and is set to debut in 2022. The announcement will be made at the North American Commercial Vehicle Show (NACV) in Atlanta, Georgia, USA.

The transmission is the latest addition to Eaton's growing eMobility portfolio of electrified vehicle (EV) transmissions and other componentry, which also includes medium-duty 2- and 4-speed models that are also currently in production with several OEMs.

“Electric buses and trucks need to be able to go up hills and run at highway speeds when they are fully loaded,” said Scott Adams, Senior Vice President, eMobility, Eaton. “Our solution is to expand the range of the motor by adding an EV transmission. With this addition, the vehicle can perform well on hills and efficiently at highway speeds with a smaller, less costly motor.”

The heavy-duty 4-speed EV transmission solves the primary issue related to single-speed drives: contradictory requirements for high efficiency at top speeds and increased torque at launch and low speeds. Fine-pitch helical gears ensure a smooth, low-noise operation, while the Eaton Transmission Control Unit's shifting strategy is designed for fast gear changes and maximum efficiency, which extend range and battery life.

The transmission is based on traditional, robust and efficient lay shaft architecture typical of AMTs but is designed specifically for electric commercial vehicle applications. Unlike traditional commercial vehicle transmissions, Eaton's 4-speed EV gearbox does not have a clutch, and shifts are synchronised using the traction motor. It also operates at higher speeds than its traditional internal combustion gearbox counterparts, and gears are optimised for typical electric motor performance and power curves for maximum efficiency.

By providing higher output speed capability and torque range than a direct-drive system, the transmission enables the usage of a smaller, lighter electric motor for large commercial vehicles, which cuts down on the cost, a major buying point for commercial EV operators.


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Eaton to launch a purpose-built, heavy-duty Transmission for Commercial EVs
Modified on Wednesday 23rd October 2019
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Eaton to launch a purpose-built, heavy-duty Transmission for Commercial EVs
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