抄録
The novel mechanism CVT (Shaft Drive CVT, S-CVT) was developed by the authors. The concave disks/rollers, these were the rolling elements of S-CVT, had a difficulty to increase the torque capacity. One reason was that the increase of the spin and the contact pressure. Another reason was that the collision of the disks frequently occurs. To solve these problem, the zero-spin disk/roller was devised. At every speed ratio, the spin decreased to less than 1%. In addition to this, another problems were solved. To improve the power to weight ratio of S-CVT, an optimum design of zero-spin disk was achieved by considering the shear model of traction oil in EHL contact area, maximum Hertzian pressure and the masses of the disks/rollers. The results of calculations were that the power to weight ratio of zero-spin disk/roller was 2.3kW/kg, and that of concave disk/roller was 1.7kW/kg.
