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idle wheel

idle wheel


idle wheel  

n.  

  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.

idle pulley also idler pulley  
n.   A pulley on a shaft that rests on or presses against a drive belt to guide it or take up slack. Also called idle wheel.
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The American Heritage® Dictionary of the English Language, Fourth Edition
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