Proterra, a leading innovator in commercial vehicle electrification technology, has selected Eaton's  eMobility business unit a 4-speed medium-duty electric vehicle (EV) transmission  for the ProDrive drivetrain of its ZX5 electric bus. 

"Our electric vehicle transmissions deliver unmatched performance with class-leading acceleration, horsepower, range and durability. Our transmissions also enable extended range thanks to improved efficiency."

——Eaton Vehicle Group ePowertrain, New product promotion manager,  Julie Marshaus

Eaton's  mid-size 4-speed transmission will be used in North American city buses.

This transmission solves the main problem of single-speed drive, which is the inability to simultaneously satisfy the high efficiency required for high-speed driving and the high torque required for starting and low-speed driving. The transmission is a lightweight countershaft gearbox capable of up to 1,200Nm (885 lb.-ft.) of maximum input torque, using an electric shift drive that allows manufacturers to use smaller, more efficient electric motors.

Eaton's 4-speed transmission features fine-pitch helical gears for smooth, low-noise operation, and a shifting strategy designed to extend range and battery life.

 Road tests have shown that under normal driving conditions, 4-speed transmissions are 20 to 30 percent more energy efficient than direct drive transmissions; 4-speed products are 10 to 30 percent more energy efficient than current 2-speed solutions. 

Eaton's E-moiblity products includes:

EV PDU

EV fuses(Fuse rated voltage at 70VDC, 500VDC, 800VDC, 1000VDC series fuse);

Pypro fuse( 1000VDC, 400A; 650VDC, 400A);

EV DC Contactor( 1000VDC with rated current of 250A, 300A, 400A, 600A) 

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