Variable turbine and/or compressor geometry for an exhaust gas turbocharger

Abstract

At least one of a variable turbine geometry and a variable compressor geometry for an exhaust gas turbocharger may include a housing including a first housing wall and a blade bearing ring having at least one guide blade rotatably mounted thereon. A control lever may be included for adjusting the at least one guide blade between a closing position and an opening position. An actuating shaft may be connected to the control lever in a rotationally fixed manner along a rotation axis. The actuating shaft may be rotatably mounted on the housing via a passage opening disposed in the first housing wall. The actuating shaft may directly support itself on the first housing wall in the passage opening.

1 . At least one of a variable turbine geometry and a variable compressor geometry for an exhaust gas turbocharger, comprising:
 a housing including a first housing wall,   a blade bearing ring including at least one guide blade rotatably mounted thereon,   a control lever for adjusting the at least one guide blade between a closing position and an opening position,   an actuating shaft connected to the control lever in a rotationally fixed manner along a rotation axis, the actuating shaft rotatably mounted on the housing via a passage opening disposed in the first housing wall, and   wherein the actuating shaft directly supports itself on the first housing wall in the passage opening.   
     
     
         2 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 1 , further comprising a protective coating disposed on a wall section of the first housing wall delimiting the passage opening. 
     
     
         3 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 2 , wherein the protective coating contains at least one of carbon and nitrogen. 
     
     
         4 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 1 , wherein:
 the housing further includes a second housing wall disposed opposite the first housing wall, the second housing wall together with the first housing wall at least partly delimiting a housing interior, wherein the second housing wall includes a recess disposed axially aligned with the passage opening in the first housing wall with respect to the rotation axis, and   the actuating shaft includes an axial end section arranged in the recess directly supported on the second housing wall of the housing.   
     
     
         5 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 1 , wherein the housing further includes a second housing wall having an inner surface facing towards a housing interior, the inner surface of the second housing wall include a protective coating disposed in a region of a recess mounting the actuating shaft opposite of the passage opening. 
     
     
         6 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 4 , wherein the recess is configured as an axial stop for stopping the actuating shaft in a movement along a centre longitudinal axis of the actuating shaft in a direction towards the second housing wall of the housing. 
     
     
         7 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 1 , wherein the control lever is fixed to the actuating shaft via at least one of a clamping connection, a screw connection and a press connection. 
     
     
         8 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 1 , wherein the housing further includes a second housing wall which together with the first housing wall at least partially defines a housing interior, and further including a spring-elastic element arranged between the second housing wall at one end and the control lever at another end for preloading the control lever towards the first housing wall. 
     
     
         9 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 8 , wherein the spring-elastic element includes a coil spring, arranged coaxially to a centre longitudinal axis of the actuating shaft and spirally wraps the actuating shaft radially on an outside of the actuating shaft. 
     
     
         10 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 1 , further comprising a bearing disc arranged between control lever and a second housing wall of the housing disposed opposite the first housing wall, the bearing disc configured to seal a housing interior defined at least partly by the first housing wall and the second housing wall against a surrounding environment of the housing. 
     
     
         11 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 4 , wherein:
 the recess of the second housing wall further includes a passage opening, the passage opening of the recess including a first opening diameter in a first axial section facing the housing interior, wherein the first axial section extends into a second axial section of the passage opening of the recess in a direction away from the housing interior, the second axial section including a second opening diameter that is smaller than the first opening diameter,   the actuating shaft is received in the first axial section, and   a preload element disposed in the second axial section for preloading the actuating shaft against the first housing wall, wherein the preload element is arranged between a face end of the actuating shaft facing the second housing wall and a housing wall of at least one of a compressor housing and a turbine housing, the at least one of the compressor housing and the turbine housing mountable against a side of the second housing wall facing away from the housing interior.   
     
     
         12 . The at least one of the variable turbine geometry and the variable compressor geometry according to  claim 11 , wherein the preload element is configured as a stamp element and includes a stamp shaft arranged in the second axial section of the passage opening of the recess, the stamp shaft connected to a stamp section disposed away from the actuating shaft with respect to the stamp shaft, wherein the stamp section is received in a second recess arranged complementary to the stamp section, the second recess disposed on the side of the second housing wall facing away from the housing interior and defining at least part of the passage opening of the recess. 
     
     
         13 . An exhaust gas turbocharger, comprising: at least one of a variable turbine geometry and a variable compressor geometry, the at least one of the variable turbine geometry and the variable compressor geometry including:
 a housing including a first housing wall and a second housing wall, the first housing wall together with the second housing wall at least partially defining a housing interior;   a blade bearing ring including at least one guide blade rotatably mounted thereon;   a control lever for adjusting the at least one guide blade between a closing position and an opening position; and   an actuating shaft connected rotationally fixed to the control lever and being rotatable along a rotation axis, wherein the actuating shaft is rotatably mounted on the housing via a passage opening disposed in the first housing wall and a recess disposed in the second housing wall, the second housing wall disposed opposite the first housing wall with respect to the rotation axis, wherein the actuating shaft is directly mounted on the first housing wall in the passage opening.   
     
     
         14 . The exhaust gas turbocharger according to  claim 13 , further comprising a protective coating disposed on a wall section of the first housing wall bordering the passage opening. 
     
     
         15 . The exhaust gas turbocharger according to  claim 13 , wherein the recess is arranged axially aligned with the passage opening, and wherein the actuating shaft includes an axial end section arranged in the recess directly supported on the second housing wall. 
     
     
         16 . The exhaust gas turbocharger according to  claim 13 , wherein the recess defines an axial stop for stopping the actuating shaft in an axial movement along a centre longitudinal axis of the actuating shaft in a direction towards the second housing wall. 
     
     
         17 . The exhaust gas turbocharger according to  claim 13 , wherein the control lever is fixed to the shaft via at least one of a clamping connection, a screw connection and a press connection. 
     
     
         18 . The exhaust gas turbocharger according to  claim 13 , further comprising a spring-elastic element arranged between the second housing wall and the control lever, the spring-elastic element configured to preload the control lever towards the first housing wall. 
     
     
         19 . The exhaust gas turbocharger according to  claim 18 , wherein the spring-elastic element includes a coil spring arranged coaxially to a centre longitudinal axis of the actuating shaft. 
     
     
         20 . The exhaust gas turbocharger according to  claim 13 , wherein the second housing wall on an inner surface facing towards the housing interior includes a protective coating disposed in a region of the recess.