Exhaust gas turbocharger with auxetic structures

Abstract

An auxetic material or auxetic structures in an exhaust gas turbocharger having a shaft and at least one compressor wheel arranged on the shaft, a turbine wheel and a housing in which the shaft, the compressor wheel, and the turbine wheel are arranged. At least one part of the housing includes an auxetic material with a negative Poisson's ratio.

1 . An exhaust gas turbocharger comprising:
 at least two adjacent components; and   one of an auxetic material or of an auxetic structure with a negative Poisson's ratio in or on the exhaust gas turbocharger between the at least two adjacent components configured to influence thermal and transient elongations.   
     
     
         2 . The exhaust gas turbocharger of  claim 1 , wherein the auxetic material or the auxetic structure comprises an elastic connecting element arranged between the at least two adjacent components configured as two housing walls, in hollow spaces of components of the exhaust gas turbocharger or between the at least two adjacent components of the exhaust gas turbocharger adjoining one another. 
     
     
         3 . An exhaust gas turbocharger comprising:
 a shaft;   at least one compressor wheel arranged on the shaft;   a turbine wheel; and   a housing in which the shaft, the at least one compressor wheel, and the turbine wheel are arranged,   wherein at least a part of the housing has an auxetic material with a negative Poisson's ratio.   
     
     
         4 . The exhaust gas turbocharger according to  claim 3 , wherein the housing comprises:
 an inner housing wall; and   an outer housing wall;   wherein the auxetic material is arranged between the inner housing wall and the outer housing wall.   
     
     
         5 . The exhaust gas turbocharger according to  claim 3 , wherein the auxetic material is entirely arranged in a region surrounding at least one of the at least one compressor wheel and the turbine wheel. 
     
     
         6 . The exhaust gas turbocharger according to  claim 3 , further comprising:
 an elastic connecting element arranged between at least two adjoining components of the exhaust gas turbocharger, the elastic connecting element comprises the auxetic material.   
     
     
         7 . The exhaust gas turbocharger according to  claim 6 , wherein the at least two adjoining components are directly connected to one another by the auxetic material. 
     
     
         8 . The exhaust gas turbocharger according to  claim 3 , wherein cavities are provided in the housing that are filled with the auxetic material. 
     
     
         9 . The exhaust gas turbocharger according to  claim 3 , wherein the auxetic material is one of coated on or applied to components of the exhaust gas turbocharger. 
     
     
         10 . The exhaust gas turbocharger according to  claim 3 , wherein the exhaust gas turbocharger is a radial turbocharger, an axial turbocharger, a turboblower, or a turbine. 
     
     
         11 . The exhaust gas turbocharger according to  claim 4 , wherein the auxetic material is entirely arranged in a region surrounding at least one of the at least one compressor wheel and the turbine wheel between the inner housing wall and the outer housing wall.