Aerodynamically enhanced bearing housing pocket geometry

Abstract

A turbocharger unit having an aerodynamically enhanced pocket, comprising a turbine having a turbine housing and a turbine wheel connected to a shaft along with a compressor having a compressor housing and a compressor wheel mounted on the same shaft. There is an intermediate housing disposed between the turbine housing and the compressor housing, circumscribing the shaft, and having a compressor wheel pocket. There is a series of bearings located in the intermediate housing for supporting the shaft. There is also a series of fluid passages located in the intermediate housing which provide fluid to lubricate the bearings. A seal is used for the prevention of oil from entering the compressor wheel pocket. The compressor wheel pocket has an aerodynamically enhanced pocket for the improvement of pressure balance behind the compressor wheel, preventing the oil in the intermediate housing from entering the compressor housing.

1 . A turbocharger unit having an aerodynamically enhanced pocket, comprising: 
 a turbine having a turbine housing and a turbine wheel connected to a shaft;    a compressor having a compressor housing and a compressor wheel mounted on said shaft;    an intermediate housing disposed between said turbine housing and said compressor housing, circumscribing said shaft, having a compressor wheel pocket, said compressor wheel extending at least partially into said compressor wheel pocket;    one or more bearings located in said intermediate housing, for supporting said shaft;    a series of fluid passages located in said intermediate housing for allowing oil to lubricate said bearings;    a seal for the prevention of said oil from entering said compressor housing; and    wherein said compressor wheel pocket has an aerodynamically enhanced pocket for the prevention of air pressure imbalance around said compressor wheel, and preventing said oil from entering said compressor housing.    
   
   
       2 . The turbocharger unit of  claim 1 , wherein said aerodynamically enhanced pocket is a spoon-shaped recess.  
   
   
       3 . The turbocharger unit of  claim 2 , wherein said spoon-shaped recess is comprised of a sharp edge and a rounded recess at the end of said compressor wheel pocket.  
   
   
       4 . The turbocharger unit of  claim 1 , wherein said aerodynamically enhanced pocket is a knife-shaped recess.  
   
   
       5 . The turbocharger unit of  claim 4 , wherein said knife-shaped recess is comprised of a sharp edge having an angled recess at the edge of said compressor wheel pocket.