| 摘要 |
A variable ratio belt drive of the type in which each pulley has an axially movable pulley half for varying the effective drive diameter and speed ratio in a continuous, stepless manner. The drive includes a primary control assembly in one pulley having a threaded interconnection between the drive shaft and one of the pulley halves for effecting a change in the drive diameter upon application of a brake band to a collar mounting the pulley half. In one preferred embodiment, two collars and two brake bands are provided while in another, only a single band and collar is used. The other pulley is provided with a secondary control assembly which automatically responds to the primary control assembly and preferably includes cam means for precluding belt slippage.
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