Exhaust gas turbocharger for a motor vehicle

Abstract

The invention relates to an exhaust gas turbocharger ( 1 ) for a motor vehicle with a shaft ( 2 ) carrying a compressor wheel and a turbine wheel which is mounted in a bearing housing ( 3 ), wherein in the region of the mounting in the bearing housing ( 3 ) at least one shaft sealing ring ( 4 ) is provided which is held in a shaft-sided circumferential groove ( 5 ). It is substantial to the invention here that at least two axially adjacent shaft sealing rings ( 4, 4′ ) are provided which are held in corresponding shaft-sided circumferential grooves ( 5, 5′ ), that an outer diameter (D) of the shaft ( 2 ) surrounding the shaft-sided circumferential grooves ( 5, 5′ ) is different in size.

1 .- 7 . (canceled) 
   
   
       8 . An exhaust gas turbocharger comprising:
 a shaft carrying at least on of a compressor wheel and a turbine wheel, wherein the shaft is mounted in a bearing housing, wherein at least one shaft sealing ring is provided and is retained in a shaft-sided circumferential groove, wherein at least two shaft sealing rings are positioned axially adjacent to each other and are retained in the corresponding shaft-sided circumferential grooves; and   an outer diameter (D) of the shaft surrounding the shaft-sided circumferential grooves is a different in size.   
   
   
       9 . The exhaust gas turbocharger according to claim  1 , wherein the shaft outer diameter (D) increases steadily in an assembly direction of the shaft sealing rings. 
   
   
       10 . The exhaust gas turbocharger according to claim  1 , wherein the shaft outer diameter (D) increases unsteadily in an assembly direction of the shaft sealing rings. 
   
   
       11 . The exhaust gas turbocharger according to claim  1 , wherein the shaft outer diameter (D) increases step-like in an assembly direction of the shaft sealing rings. 
   
   
       12 . The exhaust gas turbocharger according to claim  1 , wherein the shaft outer diameter (D) increases sawtooth-like in an assembly direction of the shaft sealing rings. 
   
   
       13 . The exhaust gas turbocharger according to claim  1 , wherein a transition from a groove wall to a groove base is rounded. 
   
   
       14 . The exhaust gas turbocharger according to claim  1 , wherein at least one shaft sealing ring is provided on at least one of the compressor side and the turbine side. 
   
   
       15 . The exhaust gas turbocharger according to claim  1 , wherein the circumferential grooves are arranged at least one of directly on the shaft and on a ring element joined with the shaft in a rotationally fixed manner. 
   
   
       16 . The exhaust gas turbocharger according to claim  2 , wherein a transition from a groove wall to a groove base is rounded. 
   
   
       17 . The exhaust gas turbocharger according to claim  2 , wherein at least one shaft sealing ring is provided on at least one of the compressor side and the turbine side. 
   
   
       18 . The exhaust gas turbocharger according to claim  2 , wherein the circumferential grooves are arranged at least one of directly on the shaft and on a ring element joined with the shaft in a rotationally fixed manner. 
   
   
       19 . The exhaust gas turbocharger according to claim  3 , wherein a transition from a groove wall to a groove base is rounded. 
   
   
       20 . The exhaust gas turbocharger according to claim  3 , wherein at least one shaft sealing ring is provided on at least one of the compressor side and the turbine side. 
   
   
       21 . The exhaust gas turbocharger according to claim  3 , wherein the circumferential grooves are arranged at least one of directly on the shaft and on a ring element joined with the shaft in a rotationally fixed manner. 
   
   
       22 . The exhaust gas turbocharger according to claim  4 , wherein a transition from a groove wall to a groove base is rounded. 
   
   
       23 . The exhaust gas turbocharger according to claim  4 , wherein at least one shaft sealing ring is provided on at least one of the compressor side and the turbine side. 
   
   
       24 . The exhaust gas turbocharger according to claim  4 , wherein the circumferential grooves are arranged at least one of directly on the shaft and on a ring element joined with the shaft in a rotationally fixed manner. 
   
   
       25 . The exhaust gas turbocharger according to claim  5 , wherein at least one shaft sealing ring is provided on at least one of the compressor side and the turbine side. 
   
   
       26 . The exhaust gas turbocharger according to claim  5 , wherein the circumferential grooves are arranged at least one of directly on the shaft and on a ring element joined with the shaft in a rotationally fixed manner. 
   
   
       27 . The exhaust gas turbocharger according to claim  6 , wherein the circumferential grooves are arranged at least one of directly on the shaft and on a ring element joined with the shaft in a rotationally fixed manner.