Thermal Structure Coupling Analysis of Friction Pair of Electronic Limited Slip Differential

Abstract

In order to study the deformation mechanism of the friction pair of electronic limited slip differential, a coupled thermal-structural mathematical model of the friction pair is established. The temperature and stress field distribution of the friction pair are obtained by finite element method. This article analyzes the distribution characteristics of temperature and stress field, and obtains the relationship between temperature and pressure change of contact surface. The results show that under the differential starting condition, the temperature rise is obvious, and the steel disk has the possibility of warping deformation. In the future, during the optimal design of electronic limited slip differential, it can provides a reliable theoretical basis for the design of friction pairs. Introduction The electronic limited slip differential is a kind of differential which controls the automobile through the electronic control signal. When it works, it drives the wet clutch to distribute the torque of the left and right wheels so as to keep the automobile running smoothly. When a car encounters one side of the tire skidding, the electronic limited slip differential will get the signal and start to turn to the differential limited slip condition. The friction pair will begin to engage until the friction sheet and the dual steel sheet reach the same speed. In this process, the relative rotation of the friction sheet and the dual steel sheet will produce a lot of heat. The friction action in relative rotation includes not only the shearing of oil film in the clearance of friction pair, but also the shearing of micro-convex body on the surface of friction pair, which causes the internal stress of friction pair to rise until deformation and failure occur[1]. In the research of wet clutch friction pair at home and abroad, the simulation and analysis of temperature field and stress field of friction pair are mainly focused on, and the temperature distribution and stress field distribution in the process of friction pair engagement are obtained. Zagrodzki and Truncone[2,3] focus on thermoelastic instability and hot spot formation of wet clutch; Li and Barber, Jen and Nemecek[4,5] use instantaneous modal analysis method and full implicit finite difference numerical analysis method respectively to calculate temperature distribution of friction pairs. On this basis, Jiayuan Zhang and Puxian Ding[6] established the thermoelastic contact model of the friction pair, and gave the stress variation law of the friction sheet and the dual steel sheet during the bonding process. In this paper, the thermal deformation of friction pair of electronic limited slip differential under differential starting condition is studied and analyzed. Using ANSYS finite element analysis method, the thermal-structural coupling analysis of the friction pair of the wet clutch of the electronic limited slip differential is carried out, and the temperature and stress field distribution on the friction lining and the dual steel sheet under the working condition are obtained. Failure Type of Friction Pair of Electronic Limited Slip Differential Electronic limited slip differential is mainly composed of differential shell, planetary gear, clutch, cycloid pump and end cover. The clutch is composed of friction discs, pistons and clutch gears. The friction pairs (friction discs) of the electronic limited slip differential clutch studied in this paper are composed of multiple friction discs and dual steel discs. Fig.1 shows the schematic diagram of the International Conference on Modeling, Analysis, Simulation Technologies and Applications (MASTA 2019) Copyright © 2019, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/). Advances in Intelligent Systems Research, volume 168