Development of Shaft Drive CVT for Automobiles Applying Crossed Axle Traction Drive

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The novel mechanism CVT (Shaft Drive CVT) was developed by the authors. The input and output shafts with conical disks are parallel and an idler shaft having conical rollers at both ends is placed perpendicular to the input/output shafts. This idler shaft transmits torque from the input shaft to the output shaft and its linear motion produces the speed variation by changing the contact point between the input/output disk and the idler roller. During this research project term, following results are obtained. 1)The curved shape of disk to decrease an amount of spin that has adverse effect on traction contact performance was developed. The effect of it was confirmed by the prototype. 2)A unique ratio changing mechanism was developed and the speed control performance was evaluated by the experiments. In the prototype S-CVT, only one motor is used to actuate disks. The mechanism using a ball screw and a gear train is developed without using any hydraulic systems. 3)The backup conical roller mechanism was devised. It is mounted to the opposite side of the idler roller, and contact with the input/output disk and the backup disk as well as the idler roller. It reduces the bearing loss of the input/output shaft because it supports the axial force of idler roller at the opposite side. The amount of transmitted torque is enlarged by this mechanism. The effectiveness of the backup rollers was confirmed by the experiments, and the efficiency of 98.4% was obtained at high ratio.