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International Journal of Automotive Technology > Volume 22(5); 2021 > Article
International Journal of Automotive Technology 2021;22(5): 1215-1226.
STUDY ON WHEEL-SIDE DRIVE SYSTEM WITH A SINGLE TRAILING ARM
Bin Wang1, Xinbo Chen2, Hongming Lyu3, Xinwei Niu4
1Shanghai Ocean University
2Tongji University
3Yancheng Institute of Technology
4Penn State Harrisburg
PDF Links Corresponding Author.  Xinbo Chen , Email. chenxinbo@tongji.edu.cn
ABSTRACT
In order to reduce unsprung mass and ensure driving comfortability, a novel electrical vehicle (EV) drive system, which integrated the wheel-side reducer and a single trailing arm, was studied in this paper. Firstly, the general structure of the drive system was studied, in which the reducer not only worked as a wheel-side reducer but also as the single trailing arm. Then, the transmission power losses were modeled by integrating different load-independent and load-independent models of power losses. Next, the experiment of the power losses test for the wheel-side drive system was conducted, which declared the patterns of power losses of electric motor and the whole drive system. Finally, the power losses of wheel-side reducer based on NEDC are studied, which illustrates oil churning and gear sliding power losses are the main types of transmission power losses. At low rotational velocities, gear friction power losses are larger than oil churning power losses. While at high rotational velocities, oil churning power losses are dominant. The transmission efficiency of the reducer based on NEDC varies among the range of 78 ~ 95 %, which depends on the torque and rotational velocity transmitted from the driving motor to EV’s wheel.
Key Words: Wheel-side drive system, Single trailing arm, Power losses, Transmission efficiency, Unsprung mass, Electrical vehicle
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