| 摘要 |
A transmission including a cylindrical drive pulley, a cylindrical driven pulley, an endless belt of a suitable material and a predetermined uniform thickness, the belt being frictionally confined between the drive and driven pulleys and loosely encompassing one of the pulleys, an inner pair of cylindrical positioning pulleys mounted within the endless belt on opposite sides of the encompassed pulley, an outer pair of cylindrical positioning pulleys mounted on the outside of said endless belt on opposite sides of the other pulley, each of the inner and outer pairs of positioning pulleys frictionally confining the endless belt, and means for moving the pairs of positioning pulleys inwardly or outwardly with respect to the interior of the endless belt so as to cause the endless belt to bend partially around one of the drive and driven pulleys such that the inner and outer surfaces of the belt become respectively alternately shortened and lengthened therearound, to thereby serve as an extension of the radius of the partially surrounded pulley for infinitely varying the resultant speed ratio between the drive and driven pulleys within predetermined limits.
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