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Variable displacement exhaust turbocharger equipped with variable nozzle mechanism

  • US 9,784,178 B2
  • Filed: 09/05/2012
  • Issued: 10/10/2017
  • Est. Priority Date: 09/28/2011
  • Status: Active Grant
First Claim
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1. A variable displacement exhaust turbocharger which is equipped with a variable nozzle mechanism and is driven by exhaust gas from an engine, the variable displacement exhaust turbocharger comprising:

  • a plurality of nozzle vanes supported rotatably by a nozzle mount which is fixed to a case including a turbine casing of the variable displacement exhaust turbocharger;

    a drive ring which is interlocked with an actuator and is fitted to an annular guide part protruding from a center part of the nozzle mount in an axial direction;

    a plurality of lever plates each of which is fitted to a groove formed in the drive ring at one end via a connection pin and is connected to the nozzle vane at the other end;

    the variable nozzle mechanism configured to swing the plurality of lever plates by rotation of the drive ring so as to change a vane angle of the plurality of nozzle vanes;

    a press-fitting pin which is press-fit to a side of the nozzle mount at a position closer to a rotation axis than the annular guide part, anda relief provided in a section of connection between a protruding portion on a side face of the nozzle mount and the annular guide part,wherein a bulge suppressing portion is provided in at least one of the press-fitting pin or a press-fitting hole formed in the axial direction of the nozzle mount so as to absorb and suppress a bulge of an outer peripheral surface of the annular guide part generated when the press-fitting pin is press-fit in the press-fitting hole, andwherein the press-fitting pin includes a flange for retaining an inner peripheral part of the drive ring to prevent inner peripheral part of the drive ring from coming off from the annular guide part, a radial direction in which the flange extends to another peripheral part of an end surface of the annular guide part is a thrust direction so as to secure a clearance.

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