Pulley device, in particular for tensioning idler or runner roller

A pulley device suitable for a belt of one of chain tensioning idler or runner roller, comprising:

• a bearing comprising a rotatable outer ring and a fixed inner ring, the rings being coaxial, and
• a pulley comprising:
• a single pulley part having, in cross section, an overall shape of a “C”, and having an inner cylindrical portion with an inner cylindrical surface mounted on an outer cylindrical surface of outer ring of bearing,
• an outer cylindrical portion having an outer cylindrical surface intended to be in contact with the belt or the chain, the outer cylindrical portion entirely axially overlapping the rotatable outer ring of the bearing, and
• a radial intermediate portion extending substantially radially between axial ends of inner cylindrical portion and outer cylindrical portion on one axial side of pulley device,
• the pulley part being formed integral and defining an open end on one axial side,
• wherein the outer cylindrical surface of outer ring is provided with at least one recess having in cross section a concave internal profile, and
• wherein the pulley part is provided with at least one protruding portion which inwardly extends beyond the inner cylindrical surface of an inner portion, the protruding portion being received in a corresponding recess of the at least one recess of the outer ring so as to block the pulley part with respect to the outer ring in both axial directions.