2011 年 77 巻 779 号 p. 2875-2883
A novel CVT mechanism (a shaft drive CVT) was developed by the authors. In the mechanism, the input and output shafts with conical disks are parallel and an idler shaft with 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 causes the speed to vary by changing the contact point between the input/output disks and the idler roller. The backup disks are connected to the input/output shafts and do not contribute to power transmission. In this paper, we propose a mechanism to transmit torque between the backup disks and input/output shafts to enlarge the amount of transmitted torque. A gear train was added behind the backup disk for new torque path. Its effect is examined and confirmed by the experiment using the prototype CVT. The efficiency of 3 percentage points was improved and the torque capacity became twice by the contribution of backup disk.