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Glite Dictionary
idler pulley

idler pulley

8.3
A small wheel on a shaft that presses against a belt to keep it tight
  • noun
  • Specialized
translation icon : polea loca
  • To maintain the equipment, regularly check the idler pulley for signs of wear or damage.

Examples

  • A worn-out idler pulley can cause the belt to slip and reduce the efficiency of the machine.

  • I've had to replace the ignition cylinder, thermostat housing, sway bar links, idler pulley, and belt tensioner, etc.

    Blog text (30)

  • The mechanic explained that the idler pulley helps keep the belt tight and ensures smooth operation.

Synonyms

pulley
vsidler pulley
  • Specialized
23 3.4

A wheel with a groove that a rope moves on to lift things or change the direction of a pull

is used specifically to guide and keep belt tension not for lifting ropes
tensioner
vsidler pulley
  • Specialized
1 4.9

A device that keeps a belt or string tight in a machine

does this by pressing against the belt as a shaft mounted wheel
idle pulley
vsidler pulley
  • Specialized
7.7

A wheel on a shaft that guides and tightens a belt

is the same meaning but uses a different naming form
idle wheel
vsidler pulley
  • Specialized
7.7

A wheel that presses on a belt to guide and keep it tight without powering the belt

focuses on guiding and maintaining tension rather than on power transmission
idler
vsidler pulley
  • Specialized
7.4

A wheel that guides a belt and keeps it tight without driving it

is the specific shaft mounted part that presses to guide and tension a belt

Surface Forms

idler pulley singular
idler pulleys plural

Morphology

idler + pulley

The compound is fully compositional: 'idler' specifies the kind of pulley (an unpowered guiding/tensioning one) and 'pulley' names the device, so the overall meaning 'a pulley that guides or maintains belt tension and is not powered' is directly derivable from the constituents. This follows regular English noun-compounding patterns and mirrors technical naming in other languages, so a learner who knows both words can readily infer the MWE's meaning.

Etymology

Idler pulley comes from two simple parts: idler (a part that does not drive) and pulley (a wheel the belt runs over). It is a wheel that presses on a belt to guide it and keep 'tension', so the belt runs smoothly.