Why does a flat belt drive tighten rather than loosen?
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It is said that in a flat belt drive, if one side is tight while the other is loose, the belt will shift towards the tight side. May I ask why? Can you draw a force analysis diagram?
Because the guiding point is at the point where force is applied; the loose position is not under any force and therefore cannot serve as a guide.
If it is caused by the drive wheel and the driven wheel not being parallel, the deviation occurs in the direction of loosening.