<div class="htmlview paragraph">A new CVT and the construction of prototypes are to be described. Objectives include:</div> <div class="htmlview paragraph"> <ul class="list disc"> <li class="list-item"><div class="htmlview paragraph">Highest efficiency</div></li> <li class="list-item"><div class="htmlview paragraph">Ease of ratio change</div></li> <li class="list-item"><div class="htmlview paragraph">Large engine power capability</div></li> <li class="list-item"><div class="htmlview paragraph">Rapid response to torque changes</div></li> <li class="list-item"><div class="htmlview paragraph">Simple shapes for low manufacturing costs</div></li> </ul> </div> <div class="htmlview paragraph">A single disc is arranged transversely between two traction gearing planetaries. The high efficiency of bodies in pure rolling (i.e. without spin) is used to effect clamping forces without the need for auxiliary power. Very little power is used to effect ratio changes because the power being transmitted through the transmission is used to effect the ratio changes in response to a slight change in the lateral position of the disc. A trade-off exists between size and efficiency. Large power capability is possible because there are no members being subjected to centrifugal forces as in belt drives, and because contact conditions involve very little spin losses with their attendant heat limitations as encountered in toroidal types of CVTs.</div> <div class="htmlview paragraph"> <figure id="F1" class="figure"> <div class="graphic-wrapper"><img class="article-figure figure" src="2004-01-0356_fig0001.jpg" alt="Figure 1. "/></div> <span class="label">Figure 1</span></figure> </div>