TURBOCHARGER WITH SLIDING BLADES HAVING COMBINED DYNAMIC SURFACES AND HEAT SCREEN AND UNCOUPLED AXIAL ACTUATING DEVICE

摘要

The invention concerns 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 by means of 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).