抄録
In November 1999, the first vehicle with a traction drive CVT was manufactured and introduced to the market. The continuously variable transmission (CVT) changes speed ratio by using sideslip, which is generated by a small offset in the Y direction at the rolling contact point. The speed ratio changing mechanism of the half-toroidal CVT has been theoretically analyzed by applying two equations of motion. The first equation refers to sideslip force on the Hertzian contact area in the direction of the swing angle. The second equation refers to motion of the power roller and the hydraulic piston in the linear direction. However, neither analysis covers the effects of elastic deformation of the variator. Therefore, neither analysis can show correctly the behavior of the half-toroidal CVT during load transmission. In this paper, we will present a new analytical model for determining the elastic deformation and clearance of the half-toroidal CVT. We have implemented systematically our analytical model using MATLAB and Simulink. As a result, we can determine the behavior of the half-toroidal CVT during load transmission.
