Turbocharger, notably for a combustion engine

Abstract

The turbocharger comprises a shaft 14 , a housing 12 , a turbine wheel 20 and a compressor wheel 22 mounted onto the shaft, and at least a rolling bearing 18 disposed between the shaft and the housing and comprising an inner ring 26 , an outer ring 28 and at least one row of rolling elements 30 disposed into a rolling space 40 defined between the rings. A damping space 38 is defined between an outer surface 28 a of the outer ring and a bore 16 of the housing inside which a lubricant is located.

1 . A turbocharger comprising;
 a shaft ( 14 ),   a housing ( 12 ),   a turbine wheel ( 20 ) and   a compressor wheel ( 22 ) mounted onto the shaft, and   at least a rolling bearing ( 18 ) disposed between the shaft and the housing and comprising;
 an inner ring ( 26 ), 
 an outer ring ( 28 ) and 
 at least one row of rolling elements ( 30 ) disposed into a rolling space ( 40 ) defined between the rings, and wherein 
   a damping space ( 38 ) is defined between an outer surface ( 28   a ) of the outer ring and a bore ( 16 ) of the housing inside which a lubricant is located.   
     
     
         2 . The turbocharger according to  claim 1 , further comprising at least two sealing means ( 42 ,  44 ;  50 ,  52 ) closing at least the rolling space ( 40 ). 
     
     
         3 . The turbocharger according to  claim 2 , wherein the sealing means ( 42 ,  44 ) close the damping and the rolling spaces. 
     
     
         4 . The turbocharger according to  claim 2 , wherein the sealing means ( 42 ,  44 ) are disposed radially between the shaft ( 14 ) and the housing ( 12 ). 
     
     
         5 . The turbocharger according to  claim 2 , wherein the sealing means ( 50 ,  52 ) are disposed radially between the inner and outer rings. 
     
     
         6 . The turbocharger according to  claim 5 , wherein the sealing means ( 50 ,  52 ) only close the rolling space ( 40 ). 
     
     
         7 . The turbocharger according to  claim 6 , wherein the rolling space ( 40 ) is filled with a lubricant distinct from the lubricant located in the damping space ( 38 ). 
     
     
         8 . The turbocharger according to  claim 1 , further comprising passage means for the lubricant putting the damping space ( 38 ) and the rolling space ( 40 ) into communication. 
     
     
         9 . The turbocharger according to  claim 8 , wherein the passage means comprise a gap ( 39 ) between the outer ring and the housing. 
     
     
         10 . The turbocharger according to  claim 8 , wherein the passage means comprise holes made in the thickness of the outer ring. 
     
     
         11 . The turbocharger according to  claim 1 , wherein the lubricant located inside the damping space ( 38 ) is grease. 
     
     
         12 . The turbocharger according to  claim 1 , wherein the axial length of the rolling bearing ( 18 ) ranges between 30% and 95% of the axial dimension of the housing ( 12 ), and preferably ranges between 70% and 80%.