基于等效传热和动态热流分配的限滑离合器温度场研究

This work focuses on the influence of the convective heat transfer and input of heat flux on the nonlinear temperature field of the limited slip clutch in various continuous sliding conditions. Considering that the steady heat flux partition model cannot meet the limitation of the continuous temperature of the contact interface, a new calculation method for equivalent convective heat transfer coefficient is proposed based on the assumption of equivalent oil film of friction gap, and the temperature field prediction model for full lubrication conditions of the limited slip clutch is established during the dynamic distribution of heat flux. The clutch sliding bench is constructed and six experiments of different lubricating oil temperature and relative speed difference is designed. The results show that the established model effectively eliminates the temperature prediction deviation, and the maximum error of temperature prediction is 7.6%, which provides a theoretical basis for the research of clutch temperature field under the dynamic continuous sliding conditions. The variation of clutch temperature rise is divided into rapid growth stage A and stable growth stage B. At stage A, the decrement of heat flux input and the increment of equivalent power of convective heat transfer of the steel are positively correlated with the increase of relative speed difference, and the average temperature rise rate increases along with the heat flux density. The stable equilibrium state of input of heat flux and output of heat transfer is reached during stage B.