Turbocharger

Abstract

Turbulence of fluid in a turbine impeller outlet is reduced with a simple structure so as to improve efficiency of a turbine. In a turbocharger comprising a turbine housing 1 having a scroll passage 8 outwardly of an exhaust nozzle 9 which in turn is arranged outwardly of a turbine impeller 4 rotatably supported on a bearing housing 3 , the exhaust nozzle 9 having a plurality of nozzle vanes 15 between front and rear exhaust introduction walls on sides of the bearing and turbine housings 3 and 1 , respectively, a vane shaft for each of the nozzle vanes 15 extending at least through the front exhaust introduction wall 10 and being rotatably supported, pressing means 23 is arranged between the respective vane shafts 16 and the bearing housing 3 to urge the vane shafts 16 toward the rear wall 11 to displace the nozzle vanes 15 toward the rear wall 11.

1 . A turbocharger with a bearing housing having a scroll passage outwardly of an exhaust nozzle which in turn is arranged outwardly of a turbine impeller rotatably supported on the bearing housing, said exhaust nozzle having a plurality of nozzle vanes between front and rear exhaust introduction walls on sides of the bearing and turbine housings, respectively, a vane shaft for each of said nozzle vanes extending at least through the front wall and being rotatably supported, characterized in that it comprises pressing means arranged between the respective vane shafts and the bearing housing for urging the respective vane shafts toward the rear wall to displace the nozzle vanes toward the rear wall. 
     
     
         2 . A turbocharger as claimed in  claim 1 , wherein said pressing means is a disc spring between the vane shafts and the bearing housing. 
     
     
         3 . A turbocharger as claimed in  claim 1 , wherein said pressing means is a coiled spring between each of the vane shafts and the bearing housing. 
     
     
         4 . A turbocharger as claimed in  claim 1 , wherein each of said nozzle vanes is supported in a cantilever manner by the vane shaft on one side of the vane extending through the front wall. 
     
     
         5 . A turbocharger as claimed in  claim 1 , wherein each of said nozzle vanes is dually supported by vane shafts on opposite sides of the vane extending through the front and rear walls, respectively. 
     
     
         6 . A turbocharger as claimed in  claim 1 , wherein each of said nozzle vanes is dually supported by vane shafts on opposite sides of the vane, one of the vane shafts extending through the front wall, the other vane shaft being embedded in the rear wall. 
     
     
         7 . A turbocharger as claimed in  claim 2 , wherein each of said nozzle vanes is supported in a cantilever manner by the vane shaft on one side of the vane extending through the front wall. 
     
     
         8 . A turbocharger as claimed in  claim 3 , wherein each of said nozzle vanes is supported in a cantilever manner by the vane shaft on one side of the vane extending through the front wall. 
     
     
         9 . A turbocharger as claimed in  claim 2 , wherein each of said nozzle vanes is dually supported by vane shafts on opposite sides of the vane extending through the front and rear walls, respectively. 
     
     
         10 . A turbocharger as claimed in  claim 3 , wherein each of said nozzle vanes is dually supported by vane shafts on opposite sides of the vane extending through the front and rear walls, respectively. 
     
     
         11 . A turbocharger as claimed in  claim 2 , wherein each of said nozzle vanes is dually supported by vane shafts on opposite sides of the vane, one of the vane shafts extending through the front wall, the other vane shaft being embedded in the rear wall. 
     
     
         12 . A turbocharger as claimed in  claim 3 , wherein each of said nozzle vanes is dually supported by vane shafts on opposite sides of the vane, one of the vane shafts extending through the front wall, the other vane shaft being embedded in the rear wall.