Semi-Truck Electric Shift Unit Design Improvement
Date of Defense
Dr. Daniel Kujawski
Dr. Iskender Sahin
Dr. Jerry Hamelink
Eaton Corporation of Galesburg, Michigan is the engineering world head quarters for truck axle design. One such axle is the Eaton two-speed axle. Eaton two-speed axles are driver-controlled by means of a shift unit operated from the vehicle cab. These shift units are activated by either air or electric power, depending on the convenient source in the chassis. The electric shift units were not meeting the standards for life expectation of such a unit. Therefore, it was the desire of Eaton Corporation to have an in-depth study performed of the shift unit and its modes of failure to aid in redesign of the product. The results of the study revealed the main causes of failure to be in the circuit board, shift fork seal,and the motor mounting. Leakage in the shift unit led to corrosion of the internal components and more importantly, the circuit board. An alternative set of designs was investigated to reduce leakage and eliminate binding in the motor. These design alternatives included a redesigned motor mount and a repositioned shift fork seal.
Conklin, Tracy and Mickle, Sara, "Semi-Truck Electric Shift Unit Design Improvement" (1997). Honors Theses. 1950.
Honors Thesis-Campus Only