| Dry clutch has the advantages of low cost and high mechanical transmission efficiency,and is widely used in automatic transmission.The temperature of dry-type clutch will increase sharply under extreme conditions,which not only seriously affects the friction performance of clutch,but also affects the precise control of transmission.Therefore,it is very important to study the temperature field of the dry clutch under extreme conditions.However,most of the existing studies assume the pressure plate as a disc structure,the influence of the pressure plate convex structure on the temperature field of the clutch is not considered.Based on the basic principle of thermodynamics,the heat conduction differential equation of dry DCT main clutch and its boundary conditions and initial conditions are obtained.Based on the clutch dynamics equation,the friction heat flux density model is obtained.Based on this,a three dimensional finite element model of a dry type DCT main clutch is established on the ANASYS software platform.The finite element model was experimentally verified by simulating the extreme conditions(creeping working condition)of the clutch.This thesis compares the transient temperature field of clutch without considering the pressure plate convex structure with considering the pressure plate convex structure under the crawling condition in the ANASYS software platform.The influence of the size of the convex structure on the transient temperature field of the clutch is also studied.The results show that the convex structure reduces the maximum temperature of the platen slightly,but significantly increases the temperature gradient,and the larger the bulge size is,the more obvious the phenomenon is.The research results provide a reference for the structural design and optimization of the new type clutch,which has great engineering significance. |
