Adjusting device for a turbocharger, and turbocharger

Abstract

The invention relates to a control device for a turbocharger, comprising an exhaust gas conducting section through which fluid can flow and which includes a bypass duct for bypassing a turbine wheel that is rotatably arranged in the exhaust gas conducting section, and comprising an adjusting arm ( 3 ) for accommodating a valve element ( 2 ) provided for opening or blocking a flow cross-section of the bypass duct; the adjusting arm ( 3 ) is movably accommodated in the exhaust gas conducting section; furthermore, a flexible element ( 14 ) is provided at least for securing the valve element ( 2 ) in place on the adjusting arm ( 3 ). According to the invention, the flexible element ( 14 ) is designed to be retained radially and axially by the valve element ( 2 ).

What is claimed is: 
     
         1 . A control device for an exhaust turbocharger, comprising:
 an adjusting arm movably accommodated in an exhaust gas conducting section of the exhaust turbocharger;   a valve element accommodated on the adjusting arm for opening or closing a bypass duct of the exhaust turbocharger, including
 a valve surface arranged below the adjusting arm, 
 a first section of the valve element arranged above the adjusting arm, and 
 a second section of the valve element arranged between the valve surface and the first section and extending through an opening of the adjusting arm; and 
   a spring element, including
 an inner portion held in a groove between the first section and the second section of the valve element, and 
 an outer portion in contact with an upper surface of the adjusting arm. 
   
     
     
         2 . The control device as claimed in  claim 1 , wherein the first section and the second section have different diameters. 
     
     
         3 . The control device as claimed in  claim 1 , wherein the spring element is riveted to the valve element. 
     
     
         4 . The control device as claimed in  claim 1 , wherein the first section is a spigot. 
     
     
         5 . The control device as claimed in  claim 1 , wherein the inner portion is clamped between the first section and the second section. 
     
     
         6 . The control device as claimed in  claim 1 , wherein the outer portion is arcuate. 
     
     
         7 . The control device as claimed in  claim 1 , wherein the outer portion has a convex contact surface pushing against the upper surface of the adjusting arm radially inwardly from an outer edge of the spring element. 
     
     
         8 . The control device as claimed in  claim 1 ,
 wherein the outer portion has a convex contact surface pushing against the upper surface of the adjusting arm,   the convex contact surface being arranged radially inwardly from an outer edge of the spring element and axially below the groove.   
     
     
         9 . The control device as claimed in  claim 1 , wherein the spring element is a plate spring. 
     
     
         10 . The control device as claimed in  claim 1 , wherein the valve element comprises a securing pin arranged in a forked opening of the adjusting arm. 
     
     
         11 . The control device as claimed in  claim 1 , wherein a space is formed between an outer edge of the spring element and the upper surface of the adjusting arm. 
     
     
         12 . The control device as claimed in  claim 1 , wherein the spring element exerts an axial pressing force in a circular contact surface area onto the upper surface of the adjusting arm.