A well known practice uses mechanical variators to realize the so called Continuously Variable Transmissions (CVT) for the automotive application. A remarkable problem for one of the most used CVT's is given by the hydraulic control of the axial thrust on the half-pulleys which is necessary to the torque transmission. This also involves a heavy decrease in the transmission efficiency. In the present paper, the production of the required axial thrust by a simple spring is theoretically analyzed for several split way configurations, considering steady state and ideal operation.
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