Abstract
Distributed-drive electric vehicles constitute an important research direction for the future development of electric vehicles. In this regard, the integrated suspension wheel-side drive system has considerable development potential because it can address the lack of driving smoothness and the grounding deterioration caused by the excessive unsprung mass of the distributed-drive system. However, a complete and systematic description of the design of such a system is not available in the literature. Therefore, this paper proposes a design process for an integrated E-type multilink suspension wheel-side drive system and a method to improve the vehicle ride comfort. Based on a configuration analysis of the E-type multilink suspension using the orientation feature set method, the ADAMS platform was used to optimize the hard point coordinates of the suspension with the integrated E-type multilink suspension wheel-side drive system as the object, and the spring stiffness and damper were designed considering the driving smoothness and the grounding of the vehicle. The bushing stiffnesses were determined through tests, and the feasibility of each bushing installation was determined via elastic kinematic simulation of the integrated E-type multilink wheel-side drive system; then, optimization design of bushing stiffness was carried out for ride smoothness. Then, a lightweight design of the gears’ reducer was performed. Finally, the specific structural design and strength verification of the key components of the designed system were conducted. The results indicated that the strength of each component of the wheel-side drive system met the requirements. Thus, the overall design process of the integrated suspension wheel-side drive system was improved. This study can therefore serve as a reference for the integrated design and vehicle ride comfort improvement of wheel-side drive systems and suspensions.
Highlights
Distributed-drive electric vehicles have a short drive chain, compact structure, and high-efficiency transmission, which are important for the development of future electric vehicles [1]
A comparison between the integrated E-type multilink wheel-side drive system and a hub motor drive system with equal mass and the same parameters were carried out by multibody system dynamic simulation. e results showed that the proposed solution could effectively suppress the negative effect of the unsprung mass
E main findings of this study are as follows: (1) Based on the idea of integrating an independent suspension guiding mechanism with a wheel-side electric drive system, an integrated E-type link suspension wheel-side drive system scheme was proposed . en, the structural form of the integrated E-type link suspension wheel-side drive system was determined based on the mechanism topology theory and the orientation feature set method
Summary
Distributed-drive electric vehicles have a short drive chain, compact structure, and high-efficiency transmission, which are important for the development of future electric vehicles [1]. E kinematic model of the integrated E-type multilink suspension wheel-side drive system was built in ADAMS/View, and the coordinates of each positioning point were determined. E values of bias frequency are generally between 0.9 and 1.6 Hz for modern sedans [28]. e design equation for the stiffness of the integrated E-type multilink suspension wheel-side drive system is
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