Pulley device for a tensioning or guide roller

摘要

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.

主权项

1. 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.