VARIABLE DISPLACEMENT EXHAUST TURBOCHARGER EQUIPPED WITH VARIABLE NOZZLE MECHANISM

• US 20140147254A1
• Filed: 09/05/2012
• Published: 05/29/2014
• Est. Priority Date: 09/28/2011
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Jinnai, Yasuaki, Tashiro, Naoto, Arimizu, Hiroyuki
• Granted Patent: US 9,784,178 B2
• Time in Patent Office: Days
• US Class Current: 415/146
• CPC Class Codes: F01D 17/165 for radial flow, i.e. the vanes turning around axes which are essentially parallel to the rotor centre line F01D17/167 takes precedence
• CPC Class Codes: F01D 9/045 for radial flow machines or engines
• CPC Class Codes: F02B 37/12 Control of the pumps
• CPC Class Codes: F02B 37/24 by using pumps or turbines with adjustable guide vanes
• CPC Class Codes: F02C 6/12 Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
• CPC Class Codes: F05D 2220/40 in turbochargers
• CPC Class Codes: F05D 2240/128 Nozzles

Abstract

A variable displacement exhaust turbocharger is provided with a plurality of nozzle vanes that are rotatably supported by a nozzle mount, a drive ring that is interlocked with an actuator and fits to a guide part of the nozzle mount, a lever plate having one end coupled to the drive ring and the other end coupled to the nozzle vane, and a variable nozzle mechanism that varies the vane angle of the nozzle vane by rotating the drive ring. A bulge suppressing portion is provided for absorbing bulging occurring on an outer peripheral surface of the guide part, the bulging being caused by the press-fitting of a nail pin into a press-fitting hole in a direction slightly toward the rotational axis with respect to the guide section and following the axial direction of the nozzle mount.

Claims

1-9. -9. (canceled)

10. 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; and

a press-fitting pin which is press-fit to a side of the nozzle mount at a position slightly closer to a rotation axis than 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.

11. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 10,

wherein a depth of the press-fitting hole is greater than a thickness of the annular guide part in the axial direction, and the bulge suppressing portion includes an enlarged diameter part which is formed in the press-fitting hole in such a manner that a hole diameter of the press-fitting hole is larger than an outer diameter of the press-fitting pin at least in a range corresponding to the thickness of the annular guide part in the axial direction from an insertion side.

12. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 10,

wherein a depth of the press-fitting hole is greater than a thickness of the annular guide part in the axial direction, and the bulge suppressing portion includes a reduced diameter part which is formed in the press-fitting pin in such a manner that an outer peripheral part of the press-fitting pin is smaller than a diameter of the press-fitting hole at least in a range corresponding to the thickness of the annular guide part in the axial direction from a base part toward a tip part of the press-fitting pin.

13. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 10,

wherein the bulge suppressing portion includes a notch which is formed along an axial direction of the press-fitting pin in such a manner that the notch is on a side nearer to the outer peripheral surface of the annular guide part.

14. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 10,

wherein the bulge suppressing portion comprises a cylindrical spring pin which has a C-shaped cross-section and is press-fitted into the press-fitting hole, and a pin which is press-fitted into an inner cylindrical part of the cylindrical spring pin.

15. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 10,

wherein the bulge suppressing portion is a cutout portion of the outer peripheral surface of the guide part which is cut out in advance in an amount equivalent to a bulge amount.

16. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 11,

wherein the press-fitting pin is a headed pin with a flange-shaped head for retaining an inner peripheral part of the drive ring so that inner peripheral part of the drive ring does not come off from the guide part.

17. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 11,

wherein the press-fitting pin is a stopper pin which is configured to restrict an opening degree of the nozzle vane by contacting a side face of the lever plate.

18. The variable displacement exhaust turbocharger equipped with a variable nozzle mechanism according to claim 11,

wherein the press-fitting pin is a lock pin for positioning between the bearing housing and the nozzle mount.