Timing belt tensioning idler pulley device for use in internal combustion heat engine, has operating crank including reluctor unit for detecting predetermined wear limit of belt based on angular position of crank with respect to support

摘要

The device has a fixed support (5) including a sensing unit and a magnetic unit that creates a magnetic field to proximity of the sensing unit. An operating crank (3) includes a reluctor unit, mounted relative to the sensing unit with an air-gap and cooperating with the magnetic unit, for detecting a predetermined wear limit of a belt (9) based on angular position of the crank with respect to the support. An independent claim is also included for a method for controlling wear of a belt.