Patent ID: 8840497

Claim:
A pulley device for a belt or chain tensioning or guide roller, the device comprising: a pulley; a rolling bearing comprising an internal ring, an external ring, and a row of rolling elements arranged between the internal ring and the external ring; an attachment member including a smooth portion and a threaded portion with an outer diameter; a spacer having an exterior surface and an interior surface extending axially therethrough, wherein a segment of the interior surface defines an elongated bore, wherein the elongated bore segment interior surface engages with the smooth portion of the attachment member and the exterior surface engages with the rolling bearing to provide adequate and independent radial support therebetween, and a transverse mounting surface disposable against an external element; and a retaining ring disposed on the attachment member and configured to retain the attachment member axially relative to the spacer, the retaining ring having an inner diameter lesser than the outer diameter of the threaded portion and less than an inner diameter of the elongated bore when the retaining ring is separate from the attachment member and an opening such that the ring is radially deflectable, wherein engagement between the elongated bore and the smooth portion extends to each side of a plane perpendicular to an axis of rotation of the rolling bearing and located through a center of the row of rolling elements, and wherein the elongated bore contacts the smooth portion of the attachment member on each side of the plane and the outer surface of the attachment member engages with the internal ring on each side of the plane.