Turbocharger, notably for a combustion engine

Abstract

Turbocharger comprising a shaft, a housing, a turbine wheel and a compressor wheel mounted onto the shaft, at least one rolling bearing located between the shaft and the housing and comprising an inner ring, an outer ring and at least one row of rolling elements between raceways provided on the rings. Said turbocharger comprises at least one intermediate sleeve radially located between the shaft and the inner ring of the rolling bearing.

1 . A turbocharger comprising:
 a shaft,   a housing,   a turbine wheel, and   a compressor wheel mounted onto the shaft, and   at least one rolling bearing located between the shaft and the housing and having:
 an inner ring, an outer ring, and at least one row of rolling elements between raceways provided on the rings, and wherein 
 the turbocharger further provides at least one intermediate sleeve radially located between the shaft and the inner ring of the rolling bearing. 
   
     
     
         2 . The turbocharger according to  claim 1 , wherein the intermediate sleeve includes at least one end axially extending further than a radial lateral surface of the inner ring of the rolling bearing. 
     
     
         3 . The turbocharger according to  claim 2 , wherein the at least one end of the intermediate sleeve includes at least one positioning means adapted to cooperate with an external tool. 
     
     
         4 . The turbocharger according to  claim 3 , wherein the positioning means includes at least one annular groove. 
     
     
         5 . The turbocharger according to  claim 3 , wherein the positioning means provides at least one threaded portion. 
     
     
         6 . The turbocharger according to  claim 3 , wherein the positioning means includes at least one radial hole or opening. 
     
     
         7 . The turbocharger according to  claim 3 , wherein the positioning means provides at least one radial through-hole or through-opening, made through the thickness of the intermediate sleeve. 
     
     
         8 . The turbocharger according to  claim 1 , wherein the intermediate sleeve includes at least one axial slot provided axially on all the axial length of the intermediate sleeve. 
     
     
         9 . The turbocharger according to  claim 1 , wherein the intermediate sleeve has a stepped bore adapted to cooperate with a stepped outer cylindrical surface of the shaft. 
     
     
         10 . The turbocharger according to  claim 1 , wherein one end of the intermediate sleeve provides a shoulder. 
     
     
         11 . The turbocharger according to  claim 1 , further comprising a second rolling bearing mounted radially between the intermediate sleeve and the housing and having an inner ring, an outer ring and at least one row of rolling elements between said rings. 
     
     
         12 . The turbocharger according to  claim 1 , wherein the intermediate sleeve includes a first cylindrical portion in contact with the inner ring of the first rolling bearing, a second cylindrical portion having a diameter bigger than the diameter of the first cylindrical portion and a third cylindrical portion having a toroidal surface and forming an inner ring of a second rolling bearing having an outer ring and at least one row of rolling elements between said second outer ring and said toroidal surface of the sleeve. 
     
     
         13 . The turbocharger according to  claim 12 , wherein the intermediate sleeve has a stepped bore adapted to cooperate with a stepped outer cylindrical surface of the shaft. 
     
     
         14 . The turbocharger according to  claim 11 , wherein the first outer ring and the second outer ring form one unique outer ring. 
     
     
         15 . The turbocharger according to  claim 1 , wherein the intermediate sleeve is made of a metallic material.