Linkage Behavior in a Half-Toroidal CVT and Its Influence on Torque Capacity

Abstract

It is important for downsizing of double-cavity toroidal CVT to equalize the amount of torque transmission of four power rollers as mid-rolling element. For equalization, the structure that supports power rollers using hydraulic pistons has been applied. However, inappropriate design of trunnions and link mechanism supporting rollers and pistons brings relative displacement, resulting in interference force. The force makes differences of transmission torque among power rollers, which leads to reduction of total transmission torque. This paper presents the causes and solutions for interference between the link mechanism and trunnions and experimental results of a 20 percent reduction of interference force.