| 摘要 |
The automatic system contains a belt pulley consisting of two symmetrical halves (1 & 2). When the planes of the two halves approach, the operating diameter of the transmission belt (13) changes and the ratio speed-power also changes. The movable half (2) under the effect of the force of gravity lies on free bodies (12) which are moving to the periphery of the cavity (9) housing them. The bodies (12), under the effect of the centrifugal force, are rising along the inclined surfaces (11) and move the movable part (2) to the fixed one (1). Belt (13) engages the receiving pulley (14) consisting of two halves - movable and fixed, connected by means of a spring (16) which effects the pullying force of the belt (13).
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