Tensioning Roller or Winder Device

Abstract

The chain or belt tensioning roller or winder device is provided with a rolling bearing 14 comprising an inner ring 30, an outer ring 32 and at least one row of rolling elements 34 mounted between the rings, with a pulley 12 overmoulded onto the outer ring and with a fixing screw 18 axially immobilized with respect to the rolling bearing. The device comprises a sleeve 16 overmoulded inside the bore of the inner ring and provided with a through-bore 16 d for mounting the fixing screw 18. The sleeve is provided with means of axially retaining the fixing screw 18 inside the through-bore of the sleeve 16.

1 . A tensioning roller or winder device comprising:
 a rolling bearing including an inner ring, an outer ring and at least one row of rolling elements disposed between the inner and outer rings,   a pulley overmoulded onto the outer ring,   a fixing screw axially immovable with respect to the rolling bearing, and   a sleeve overmoulded inside the bore of the inner ring and having a through-bore configured to receive the fixing screw, the sleeve having means for axially retaining the fixing screw inside the through-bore of the sleeve.   
     
     
         2 . The device according to  claim 1 , wherein the fixing screw directly contacts the through-bore. 
     
     
         3 . The device according to  claim 1 , wherein the axial-retention means include a threaded portion configured to engage with a threaded portion of the fixing screw. 
     
     
         4 . The device according to  claim 1 , wherein an outside diameter of the sleeve is lesser than an inside diameter of a frontal radial surface of the inner ring. 
     
     
         5 . The device according to  claim 1 , wherein the sleeve and the inner ring each have frontal radial surfaces, the sleeve frontal radial surfaces being one of spaced from and flush with the inner ring frontal radial surfaces. 
     
     
         6 . The device according to  claim 1 , wherein the sleeve has an axial end and a spacer piece located at the axial end, the spacer piece being configured to bear axially against the inner ring. 
     
     
         7 . The device according to  claim 1 , wherein the sleeve is an eccentric sleeve. 
     
     
         8 . The device according  claim 1 , further comprising a protective end plate mounted on the sleeve. 
     
     
         9 . The device according to  claim 8 , wherein the sleeve through-bore has a large-diameter portion and the protective end plate includes a tubular axial portion fitted into the sleeve through-bore large-diameter portion. 
     
     
         10 . The device according to  claim 8 , wherein the protective end plate is configured to press against a frontal radial surface of the inner ring. 
     
     
         11 . The device according to  claim 1 , wherein the pulley and the sleeve are each formed of a same, synthetic material.