Abstract: A turbocharger having a variable geometry turbine inlet incorporating a cylindrical piston movable to vary the area of the inlet nozzle into the turbine. Vanes mounted to the piston for flow control in the nozzle are received through a slotted heat shield which provides smooth aerodynamic flow into the turbine blades. The vanes additionally incorporate a step having larger cord and depth that engages the surface of the heat shield and seals the slots with the piston in a closed position. An axial actuator is attached for operation of the piston.

Abstract: A turbocharger having a variable geometry turbine intake incorporating a mobile cylindrical piston (70) for varying the area of the induction nozzle in the turbine (18). Blades (90) mounted on the piston for controlling the flow in the nozzle penetrate through a slotted heat shield (92) having a central opening wherein the rear disc of the turbine wheel is embedded to provide a smooth aerodynamic flow in the turbine vanes. A shield (100) engaged between the heat screen and a central housing of the turbocharger prevents the gas from the rear disc cavity from recycling into the cavity housing the blades further enhancing the aerodynamic flow. An axial actuating device (77) is secured for operating the piston via a shaft coupled by a cross (72) to the piston and coupled to an actuating hub (118) in the actuating device by quick connect unthreaded connection (122).