Transfer Case Transmission Performance Model under the Influence of Friction Lag

doi:10.3901/JME.2020.10.154

Abstract

Abstract: The performance of transfer case as an essential component of intelligent four-wheel drive is studiedmostly from the perspective of mechanical transmission, and the micro-performance caused by the contact between friction plate and steel disk is normally ignored. To address this gap, the static and dynamicmechanical models related to transfer caseare bothconstructed, the influence of lubricating oil squeeze force and hydroelastic dynamic model on friction coefficient is studied, and the friction coefficient is introduced into the torque transfer model to calculate the torque variation of the transfer case in the process of contacting and separating the friction plate and the steel plate. Results show that the friction coefficient fluctuates in the process of contacting and separating the friction plate and the steel disk, which can lead to a difference related to the torque transfer of the actuator by approximately 10 N·m. By analyzing the relationship between squeeze force and oil film thickness, it is found that the oil film squeeze force has a negative effect on the oil film thickness in the acceleration process, thus the oil film thickness is smaller than thatunder the stationary condition. On the contrary, the film squeeze force has a positive effect on the film thickness during the deceleration process, which leads to the reduction of the asperity torque transmitted and the formation of a friction hysteresis lag loop. The area of friction hysteresis lag loop represents the difference between torques during acceleration and deceleration. This research can provide a theoretical basis for the accurate control of the transfer case.

Key words: transfercase, multi-plate clutch, power transfer, friction lag, experimental test

CLC Number:

TG132

WANG Yuming, LI Hongliang, CHEN Liqing, WANG Qidong, Lü Xianyang. Transfer Case Transmission Performance Model under the Influence of Friction Lag[J]. Journal of Mechanical Engineering, 2020, 56(10): 154-162.

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