Exhaust-gas turbocharger

1. An exhaust-gas turbocharger ( 1 ) comprising:

a bearing housing ( 2 ),

a bearing cartridge inserted into the bearing housing ( 2 ), the bearing cartridge comprising at least one outer race ( 8 ), at least one inner race ( 23 ), and balls or roller elements ( 11 ), wherein a groove ( 16 ) surrounds the bearing cartridge outer race ( 8 ) and wherein the outer circumference of the outer race adjacent the groove ( 16 ) is flattened at at least one location,

a shaft ( 7 ) which is mounted in the bearing cartridge and which extends in an axial direction,

a bearing housing cover ( 9 ) which is connected to the bearing housing ( 2 ), the bearing housing cover ( 9 ) including at least one radially inwardly directed lug ( 14 ),

a turbine wheel ( 5 ) which is arranged on the shaft ( 7 ), and

a compressor wheel ( 6 ) which is arranged on the shaft ( 7 ),

wherein

to provide an axial securing action, at least one radially inwardly directed lug ( 14 ) of the bearing housing cover ( 9 ) projects into the groove ( 16 ) of the bearing cartridge outer race ( 8 ), and

to secure the bearing cartridge outer race ( 8 ) against rotation, the bearing housing cover ( 9 ) is connected directly to the bearing cartridge outer race ( 8 ) via at least one continuous radial pin inserted into the bearing housing cover ( 9 ) and into the bearing cartridge outer race ( 8 ).

2. The exhaust-gas turbocharger as claimed in claim 1 , wherein the bearing housing cover ( 9 ) is manufactured in one piece together with the lug ( 14 ).

3. The exhaust-gas turbocharger as claimed in claim 1 , wherein the bearing housing cover ( 9 ) is formed in multiple parts.

4. The exhaust-gas turbocharger as claimed in claim 1 , wherein the fit of the pin ( 15 ) in a first bore ( 17 ) in the bearing housing cover ( 9 ) is in the form of a transition or interference fit, and wherein the fit of the pin ( 15 ) in a second bore ( 18 ) in the bearing cartridge outer race ( 8 ) is in the form of a clearance fit.

5. The exhaust-gas turbocharger as claimed in claim 1 , wherein a seal bush ( 13 ) is inserted in the bearing housing cover ( 9 ), wherein the shaft ( 7 ) runs through the seal bush ( 13 ).

6. The exhaust-gas turbocharger as claimed in claim 1 , wherein the bearing housing cover ( 9 ) is connected to the bearing housing ( 2 ) by means of a bayonet connection or a screw connection ( 12 ).

7. A method for the assembly of an exhaust-gas turbocharger ( 1 ), comprising the following steps:

providing a bearing cartridge including at least one bearing cartridge outer race ( 8 ), at least one bearing cartridge inner race ( 23 ), and balls or rolling elements ( 11 ), the bearing cartridge outer race having a groove that surrounds the outer circumference and the outer circumference being flattened at at least one location adjacent the groove ( 16 ),

mounting a bearing housing cover ( 9 ) with at least one radially inwardly directed lug ( 14 ) onto the bearing cartridge outer race ( 8 ),

rotating the bearing housing cover ( 9 ) relative to the bearing cartridge outer race ( 8 ) such that the radially inwardly directed lug ( 14 ) engages into the groove ( 16 ) to axially secure the bearing cartridge outer race ( 8 ),

inserting a pin ( 15 ) radially into the bearing housing cover ( 9 ) and into the bearing cartridge outer race ( 8 ), and

inserting the pre-assembled bearing housing cover ( 9 ) and bearing cartridge into the bearing housing of the turbocharger ( 1 ) to secure the bearing cartridge outer race ( 8 ) against rotation relative to the bearing housing cover ( 9 ).

8. The exhaust-gas turbocharger as claimed in claim 1 , wherein the bearing housing cover ( 9 ) is manufactured in one piece as a cast part together with the lug ( 14 ).

9. An exhaust-gas turbocharger ( 1 ) comprising:

a bearing housing ( 2 ),

a bearing cartridge inserted into the bearing housing ( 2 ), the bearing cartridge comprising at least one outer race ( 8 ), at least one inner race ( 23 ), and balls or roller elements ( 11 ), wherein a groove ( 16 ) surrounds the bearing cartridge outer race ( 8 ) and wherein the outer circumference of the outer race adjacent the groove ( 16 ) is flattened at at least one location,

a shaft ( 7 ) which is mounted in the bearing cartridge and which extends in an axial direction,

a bearing housing cover ( 9 ) which is connected to the bearing housing ( 2 ), the bearing housing cover ( 9 ) including at least one radially inwardly directed lug ( 14 ),

a turbine wheel ( 5 ) which is arranged on the shaft ( 7 ), and

a compressor wheel ( 6 ) which is arranged on the shaft ( 7 ),

wherein

to provide an axial securing action, at least one radially inwardly directed lug ( 14 ) of the bearing housing cover ( 9 ) projects into the groove ( 16 ) of the bearing cartridge outer race ( 8 ), and

to secure the bearing cartridge outer race ( 8 ) against rotation, the bearing housing cover ( 9 ) is connected directly to the bearing cartridge outer race ( 8 ) via at least one continuous radial pin inserted into the bearing housing cover ( 9 ) and into the bearing cartridge outer race ( 8 ), wherein the radial pin ( 15 ) extends through a first bore ( 17 ) in the inwardly directed lug ( 14 ) of the bearing housing cover ( 9 ) and into a second bore ( 18 ) in the groove ( 16 ) of the bearing cartridge outer race ( 8 ).

10. The exhaust-gas turbocharger as claimed in claim 1 , wherein the radial pin ( 15 ) is fixedly seated in first bore ( 17 ) in the bearing housing cover ( 9 ) and with play in a second bore ( 18 ) in the groove ( 16 ) of the bearing cartridge outer race ( 8 ) sufficient to allow the bearing cartridge to float on a damping film.