Charging device

Abstract

A charging device may include a compressor, a bearing housing, a shaft that is rotatably mounted in the bearing housing, a compressor wheel arranged on the shaft, and a diffuser, which may radially extend from a diffuser inlet on the compressor wheel towards a diffuser outlet on a spiral-shaped compressor housing. The diffuser may be delimited by a diffuser wall and a bearing housing wall. A first section of the bearing housing wall may be oriented originating from the diffuser inlet by an angle ranging from 2° to 30° obliquely to a radial direction, and may bring about a tapering of the diffuser cross section in the radial direction away from the shaft.

1 . A charging device comprising:
 a compressor;   a bearing housing;   shaft that is rotatably mounted in the bearing housing;   a compressor wheel arranged on the shaft; and   diffuser, which radially extends from a diffuser inlet on the compressor wheel towards a diffuser outlet on a spiral-shaped compressor housing;   wherein the diffuser is delimited by a diffuser wall and a bearing housing wall; and   wherein a first section of the bearing housing wall is oriented originating from the diffuser inlet by an angle ranging from 2° to 30° obliquely to a radial direction and brings about a tapering of the diffuser cross section in the radial direction away from the shaft.   
     
     
         2 . The charging device according to  claim 1 , wherein a width of the diffuser outlet corresponds to approximately 0.375 to 0.95 the times a width of the diffuser inlet. 
     
     
         3 . The charging device according to  claim 1 , wherein the compressor wheel has a wheel back and engages into a recess on the bearing housing. 
     
     
         4 . The charging device according to  claim 1 , wherein the charging device is designed as exhaust gas turbocharger. 
     
     
         5 . The charging device according to  claim 1 , wherein the first section is adjoined by a radially extending second section of the bearing housing wall at an end radially away from the shaft, the bearing housing wall opening into a volute of the compressor housing. 
     
     
         6 . The charging device according to  claim 5 , wherein a radial length of the second section corresponds to approximately 100% to 250% of a radial length of the first section. 
     
     
         7 . The charging device according to  claim 1 , wherein the first section is formed in one piece with the bearing housing wall. 
     
     
         8 . The charging device according to  claim 1 , wherein the first section and the second section of the bearing housing wall are formed as separate inserts and are connected to the bearing housing wall. 
     
     
         9 . The charging device according to  claim 1 , wherein the bearing housing wall in a region of the diffuser includes one of a cooling duct or an air gap insulation. 
     
     
         10 . An internal combustion engine comprising a charging device including:
 a compressor;   a bearing housing;   a shaft that is rotatably mounted in the bearing housing;   a compressor wheel arranged on the shaft; and   a diffuser, which radially extends from a diffuser inlet on the compressor wheel towards a diffuser outlet on a spiral-shaped compressor housing;   wherein the diffuser is delimited by a diffuser wall and a bearing housing wall; and   wherein a first section of the bearing housing wall is oriented originating from the diffuser inlet by an angle ranging from 2° to 30° obliquely to a radial direction and brings about a tapering of the diffuser cross section in the radial direction away from the shaft.   
     
     
         11 . The internal combustion engine according to  claim 10 , wherein a width of the diffuser outlet corresponds to approximately 0.375 to 0.95 times a width of the diffuser inlet. 
     
     
         12 . The internal combustion engine according to  claim 10 , wherein the compressor wheel has a wheel back and engages into a recess on the bearing housing. 
     
     
         13 . The internal combustion engine according to  claim 10 , wherein the charging device is designed as an exhaust gas turbocharger. 
     
     
         14 . The internal combustion engine according to  claim 10 , wherein the first section is adjoined by a radially extending second section of the bearing housing wall at an end radially away from the shaft, the bearing housing wall opening into a volute of the compressor housing. 
     
     
         15 . The internal combustion engine according to  claim 14 , wherein a radial length of the second section corresponds to approximately 100% to 250% of a radial length of the first section. 
     
     
         16 . The internal combustion engine according to  claim 10 , wherein the first section is formed in one piece with the bearing housing wall. 
     
     
         17 . The internal combustion engine according to  claim 10 , wherein the first section and the second section of the bearing housing wall are formed as separate inserts and are connected to the bearing housing wall. 
     
     
         18 . The internal combustion engine according to  claim 10 , wherein the bearing housing wall in a region of the diffuser includes one of a cooling duct or an air gap insulation. 
     
     
         19 . An exhaust gas turbocharger comprising:
 a compressor;   a bearing housing;   a shaft that is rotatably mounted in the bearing housing;   a compressor wheel arranged on the shaft; and   a diffuser, which radially extends from a diffuser inlet on the compressor wheel towards a diffuser outlet on a spiral-shaped compressor housing;   wherein the diffuser is delimited by a diffuser wall and a bearing housing wall;   wherein a first section of the bearing housing wall is oriented originating from the diffuser inlet by an angle ranging from 2° to 30° obliquely to a radial direction and brings about a tapering of the diffuser cross section in the radial direction away from the shaft; and   wherein the first section is adjoined by a radially extending second section of the bearing housing wall at an end radially away from the shaft, the bearing housing wall opening into a volute of the compressor housing.   
     
     
         20 . The exhaust gas turbocharger according to  claim 19 , wherein a radial length of the second section corresponds to approximately 100% to 250% of a radial length of the first section.