Design of Hydraulic Bushings for Electric Wheel Suspension System Considering Torque Ripple

Abstract:

As the important transmission part of the vehicle vibration, the suspension bushing has a significant effect on weakening the vehicle vibration. In the wheel drive electric vehicle, the broadband frequency longitudinal vibration of the vehicle body will be caused by the torque ripple of the hub motor. The traditional rubber bushing has small changes of damping characteristics in broadband frequency ranges and it will not generate high damping to weaken the vibration rapidly on specific frequency band as well. So the hydraulic bushings were used to attenuate the excitation of torque ripple in particular frequency band. Firstly, the accurate finite element model was established and applied to analyze the sensitive factors of mechanical properties of the hydraulic bushing. Then, the design of the hydraulic bushing was performed according to the results of the analyzed sensitive factors. The results illustrated that the hydraulic bushing could substantially decrease the influence on the vehicle body longitudinal vibration by 13.4% whining the range of 0~120Hz through the reasonable parameters design of rubber shear modulus of the hydraulic bushing, the cross section area of the channel and the numbers of channels, which also supplies the reference of the suspension structure design of the distributed driving electric vehicle.