Patent ID: 6672059
Filing Date: 2004-01-06
Classification: F01D,F02C,F05D

Abstract:
A variable geometry turbocharger assembly comprising:a turbine housing having an exhaust gas inlet and an outlet, a volute connected to the inlet, and a nozzle wall adjacent the volute; a turbine wheel carried within the turbine housing and attached to a shaft; a plurality of vanes disposed within the turbine housing between the exhaust gas inlet and turbine wheel, each vane comprising: an inner airfoil surface oriented adjacent the turbine wheel; an outer airfoil surface oriented opposite the inner airfoil surface, the inner and outer airfoil surfaces defining a vane airfoil thickness; a leading edge positioned along a first inner and outer airfoil surface junction; a trailing edge positioned along a second inner and outer airfoil surface junction; and a hole disposed within a first axial vane surface substantially parallel to the nozzle wall for receiving a respective post therein, said post projecting from the nozzle wall towards the turbine wheel; wherein the vane has an airfoil thickness that is greater than about 0.16 times a length of the vane as measured between the vane leading and trailing edges to provide a higher area turndown for a fixed amount of vane rotation.