Abstract: The pulley device for a belt or chain tensioning idler or runner roller comprises a pulley (12), a roller bearing (14), a spacer (18) for the mounting of the rolling bearing (14) and being capable of pressing against an element external to the device, a fastening screw (20) immobilized axially relative to the spacer (18), and at least one retaining ring (22) which is elastic radially and which is mounted inside a groove (60) made on the fastening screw (20), a portion of the ring (22) protruding radially into a recess (52) of the spacer (18).

Abstract: A pulley device for a belt or chain tensioning or guide roller includes a pulley, a rolling bearing, and a spacer configured to support the rolling bearing and having a transverse mounting surface disposable against an external element. An attachment member includes a threaded portion with an outer diameter and a retaining ring is disposed on the attachment member and retains the attachment member axially relative to the spacer. The ring has an inner diameter lesser than the outer diameter of the threaded portion in a free state and opening such that the ring is radially deflectable. Preferably, the spacer has a recess extending from the mounting surface defined by a frustaconical surface tapering outwardly toward the mounting surface and a shoulder extending inwardly from the frustoconical surface, the ring being deflectable radially inwardly by the recess so as to be disposed generally against the shoulder of the recess.

Abstract: A pulley device for a belt or chain tensioning or guide roller includes a pulley, a rolling bearing, and a spacer configured to support the rolling bearing and having a transverse mounting surface disposeable against an external element. An attachment member includes a threaded portion with an outer diameter and a retaining ring is disposed on the attachment member and retains the attachment member axially relative to the spacer. The ring has an inner diameter lesser than the outer diameter of the threaded portion in a free state and opening such that the ring is radially deflectable. Preferably, the spacer has a recess extending from the mounting surface defined by a frustaconical surface tapering outwardly toward the mounting surface and a shoulder extending inwardly from the frustoconical surface, the ring being deflectable radially inwardly by the recess so as to be disposed generally against the shoulder of the recess.

Abstract: The pulley device for a belt or chain tensioning idler or runner roller comprises a pulley (12), a roller bearing (14), a spacer (18) for the mounting of the rolling bearing (14) and being capable of pressing against an element external to the device, a fastening screw (20) immobilized axially relative to the spacer (18), and at least one retaining ring (22) which is elastic radially and which is mounted inside a groove (60) made on the fastening screw (20), a portion of the ring (22) protruding radially into a recess (52) of the spacer (18).