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This paper describes the improvement made to the high rigidity power-roller support structure in a dual-cavity half-toroidal CVT to further increase torque capacity. As a result of re-analyzing the function and parts composition of the previous structure, a high rigidity power-roller support structure, which permits power roller movement only in the horizontal direction, has been adopted. This structure enables the thrust and radial stiffness of the power-roller support to be substantially improved over the previous structure.

This paper describes a half-toroidal continuously variable transmission (CVT) that has been newly developed. The continuously variable unit (CVU) of this CVT adopts a traction drive as its power transmission principle. The major features of this mechanism include its capacity to transmit large torque, quick ratio changes, and high transmission efficiency in the low torque range. The major CVT performance characteristics and dimensions and features of the various parts of the unit are explained here.