Rotor disk for an exhaust turbocharger, exhaust turbocharger and method for balancing a rotor assembly for an exhaust turbocharger

Abstract

A rotor disk for an exhaust turbocharger is mounted in a housing of the exhaust turbocharger so as to be able to rotate about an axis of rotation. The rotor disk has a disk hub including a disk back and a disk front facing away from the disk back. A plurality of rotor disk blades are formed on the disk hub in a manner extending between the disk back and the disk front. A balancing mark is arranged in a blade channel formed between a first blade of the plurality of rotor disk blades and a second blade, arranged adjacent to the first blade, of the plurality of rotor disk blades. The balancing mark is triangle-like. The disclosure also relates to an exhaust turbocharger comprising such a rotor disk and to a method for balancing a rotor assembly for such an exhaust turbocharger.

1 .- 8 . (canceled) 
     
     
         9 . A rotor disk for an exhaust turbocharger,
 wherein the rotor disk ( 1 ) is mounted in a housing of the exhaust turbocharger ( 3 ) so as to be able to rotate about an axis of rotation, and   wherein the rotor disk ( 1 ) has a disk hub ( 5 ) comprising a disk back ( 6 ) and a disk front facing away from the disk back ( 6 ), and   wherein a plurality of rotor disk blades ( 4 ) are formed on the disk hub ( 5 ) in a manner extending between the disk back ( 6 ) and the disk front, and   wherein a balancing mark ( 11 ) is arranged in a blade channel ( 9 ) formed between a first blade ( 7 ) of the plurality of rotor disk blades ( 4 ) and a second blade ( 8 ), arranged adjacent to the first blade ( 7 ), of the plurality of rotor disk blades ( 4 ), and   wherein the balancing mark ( 11 ) is triangle-like, and   wherein a limb ( 12 ) of the balancing mark ( 11 ) is arranged extending in a circumferential direction.   
     
     
         10 . The rotor disk as claimed in  claim 9 , wherein a mark base ( 18 ) of the balancing mark ( 11 ) is smaller than a free surface ( 20 ) of the balancing mark ( 11 ). 
     
     
         11 . The rotor disk as claimed in  claim 9 , wherein the rotor disk ( 1 ) is a compressor wheel. 
     
     
         12 . An exhaust turbocharger comprising a rotor assembly ( 2 ) which is rotatably mounted in a housing of the exhaust turbocharger ( 3 ) and comprises a shaft and at least one rotor disk ( 1 ) as claimed in  claim 9  which is connected to the shaft for conjoint rotation therewith. 
     
     
         13 . A method for balancing a rotor assembly ( 2 ) which is mounted rotatably in a housing of an exhaust turbocharger ( 3 ),
 wherein the rotor assembly ( 2 ) comprises a rotor disk ( 1 ) as in  claim 9  and   wherein the balancing mark ( 11 ) is produced using high speed balancing.   
     
     
         14 . The method as claimed in  claim 13 , wherein the balancing mark ( 11 ) is produced by material removal. 
     
     
         15 . The method as claimed in  claim 13 , wherein the balancing mark ( 11 ) is formed using a milling method. 
     
     
         16 . The method as claimed in  claim 13 , wherein the balancing mark ( 11 ) is formed using a milling method with a ball head-like tool.