Research On Dynamics Performance And Friction Power Loss Of Metal Belt CVT Working At Low Speed Ratio Condition

As for its higher fuel economy, stability, ride comfort and better performance for hybrid vehicle, etc., metal belt continuous variable transmission is one of the optimal transmissions for automobile, and is favoured by many automobile researchers and manufactures. High torque and low speed ratio is the main working condition of metal V-belt CVTs, especially in the traffic condition of cities, the transmission almost excusively work under low speed ratio condition, besides, the mechanical character is more complex and the power loss is higher under that condition, so the research the research of that is of practical value. With the support of national natural science fund project “analysis and investigate of the CVT oil film traction and wear characteristics of slip control mode”, as the respect of mechanical property and belt’s frictional power loss, the following work is done:1. The mechanical model of the metal V-belt’s transmission part under low speed ratio is built, this model revealed the mechanical relationship between the belt’s slack and tight side, by working out the relationship between speed ratio and working radius of the driving pulley, the explicit function relationship between block compression and effective ring tension on the tight side is got, based on this, the effect of speed ratio, centrifugal force, friction coefficient and input torque etc. on belt force is analyzed.2. Based on the built mechanical model, I solved and analyzed the clamping force, obtained the effection of speed ratio and input torque on clamping force; at the same time, the highest peripheral force transmittable with no slip is deduced, and the effective factors are analyze.3. Using SolidWorks, the 3D model of metal V-belt CVT is built, and simplified model is imported into ABQUS, and then completed the finite element analysis on contact stress of blocks; compared the analysis results with the surface morphology of blocks worked for a long time, analysed the contact stress state of the blocks, and confirmed the reliability of the analysis results.