Abstract: The shift process of toroidal CVT is analyzed by means of the point meshing theory with non-fixed shaft. The model of speed ratio in terms of the displacement of hydraulic cylinder is established and can be used to realize accurate control of speed ratio of CVT. In order to consider the influence of tangential traction force on the contact zone the 3-D elastic contact FEM is utilized to analyze contact stress in the contact zone and shear stress in sub-surfaces. The analysis results are beneficial for calculation of rolling contact fatigue life.

Key words: Conjugate theory, Elastic contact FEM, Speed ratio model, Toroidal CVT, Byrnes-Isidori normalized form, Hydraulic pressure control, Integrated-Electro-Hydraulic brake system