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1. A gear, wheel, or roller interposed between two similar parts to convey motion from one to the other without change in speed or direction of motion.
2. See idle pulley.
(General Engineering) a gearwheel interposed between two others to transmit torque without changing the direction of rotation to the velocity ratio. Also called: idler
i′dle (or i′dler) wheel`,
a wheel for transmitting power and motion between a driving and a driven part, either by friction or by means of teeth.
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|Noun||1.||idle wheel - a pulley on a shaft that presses against a guide belt to guide or tighten it|