| 摘要 |
A constant speed drive comprises a frictional variable speed drive controlled by a control system to produce a constant output speed. The drive includes a rotatable disc having a frusto-conical surface and being urged into frictional engagement with a rotatable annulus having a corresponding frustoconical edge, the annulus and disc being relatively movable between a position in which they are coaxial and provide a unity drive ratio and a position in which they are eccentric and provide a different drive ratio determined by the relative positions of their axes. Actuation means are provided for adjusting the positions of the axes of the annulus and disc relative to one another, and the control system controls the actuation means to vary the relative positions of the axes of the disc and annulus and thus the drive ratio to maintain a sensibly constant output speed.
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