輸入端為圓盤轉動，利用摩擦力傳遞接觸端的切線速度至輸出轉軸上的摩擦環，使得輸出旋轉軸垂直輸入旋轉軸。可利用改變摩擦環位置改變轉換比或方向。

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The disk transfers the tangent velocity to the shaft by the friction, and we can adjust the location of the ring to change the speed and direction of the shaft.