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Turbocharger with sliding blades having combined dynamic surfaces and heat screen and uncoupled axial actuating device

  • US 6,694,733 B1
  • Filed: 11/05/2002
  • Issued: 02/24/2004
  • Est. Priority Date: 01/14/2000
  • Status: Expired due to Term
First Claim
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1. A turbocharger (10) comprising:

  • a casing having a turbine housing (12) receiving exhaust gas from an exhaust head of an internal combustion engine at an intake and having an exhaust outlet, a compressor housing (16) having an air intake and a first volute, and a central housing (14) between the turbine housing (12) and the compressor housing (16);

    a turbine wheel (18) mounted in the turbine housing (12) and extracting the energy from the exhaust gas, the said turbine wheel (18) connected to a shaft (20) extending from the turbine housing (12) through a shaft bore (52) in the central housing (14) and the said turbine wheel (18) having a rear disc and multiple vanes;

    a bearing (50) mounted in the shaft bore (52) of the central housing (14), the said bearing supporting the shaft (20) for rotational movement;

    a vane wheel (22) connected to the said shaft (20) facing the turbine wheel (18) and enclosed in the compressor housing (16);

    a substantially cylindrical piston (70), concentric to the turbine wheel (18) and able to be displaced parallel to an axis of rotation of the turbine wheel (18);

    a plurality of blades (90) extending substantially parallel to the axis of rotation from a first end of the piston in the proximity of the rear disc;

    a heat screen (92) engaged at its external circumference between the turbine housing (12) and the central housing (14) and extending radially inwards towards the axis of rotation, the rear disc of the turbine wheel housed in the heat screen (92) for the smooth flow of the exhaust gas in the vanes, the said heat screen (92) also having a plurality of slots (96) receiving the blades (90); and

    means (77) for displacing the piston (70) from a first position in which the first end is in the proximity of the heat screen to a second position in which the first end is remote from the heat screen, further characterised by;

    an aerodynamic shield (100) located between the rear disc of the turbine wheel (18) and the central housing (14) and having an external circumferential portion engaging an internal circumferential portion of the heat screen (100), the said aerodynamic shield having an internal circumferential portion engaging the central housing (14) in the proximity of the shaft bore.

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