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Mounting structure for variable nozzle mechanism

A technology for mounting structures and nozzles, applied to mechanical equipment, engine components, combustion engines, etc., can solve problems such as damage, elongated scroll tube 11, and deburring

Inactive Publication Date: 2008-09-03
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a problem arises that the structure for fixing the main body of the nozzle assembly (including the nozzle bracket 4 ) to the side of the turbine housing 10 is damaged during the operation of the turbocharger.
As a result, the following problem will be caused: the turbine casing 10 becomes very large in size
In this case, since the arrangement of the turbine outlet diffuser and the like will cause confinement radially inward, as a result, the following problem will arise: it is difficult to move the scroll tube as described above
However, the following problem will arise: the scroll 11 itself becomes long in the axial direction of the turbine
As a result, the following problems will be caused: the productivity of the turbine casing is hindered
However, the above-mentioned structure inevitably requires a split type core, and as a result, will possibly cause deburring in the scroll 11.

Method used

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  • Mounting structure for variable nozzle mechanism
  • Mounting structure for variable nozzle mechanism
  • Mounting structure for variable nozzle mechanism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] refer to figure 1 and 2 , an insert 20 forming a ring shape is removably connected to the side surface of the bearing housing 13 at the outer periphery of the spout holder 4 by a plurality of fixing screws (nuts) 21 arranged circumferentially. Thus, by fastening said insert 20 to the bearing housing 13 which can be kept at a low temperature, the amount of heat conducted from the high temperature turbine casing 10 can be reduced. In addition, by arranging the fixing screw 21 at a position adjacent to the spout holder 4, the spout assembly can avoid deformation or movement as much as possible.

[0071]The turbine housing 10 is formed therein with a connection hole 10 a having a diameter substantially equal to the outer diameter of the scroll 11 extending from the scroll 11 to the bearing housing 13 . The outer peripheral portion 20 of the insert 20 is fitted in the connection hole 10a at the inner circumference of the connection hole 10a in a spigot configuration. The ...

no. 2 example

[0080] image 3 is a longitudinal sectional view of the essential part of the upper half on the turbine side of the second embodiment of the present invention.

[0081] In this second embodiment, an integrated spout holder type insert 26 is provided, wherein the spout holder 4 and the insert 20 described in the first embodiment are integrally combined with each other. The above-mentioned one-piece spout bracket type insert 26 is fitted at its outer periphery in a connecting hole 10 a formed in the turbine housing 10 and opening from the scroll 11 toward the bearing housing 13 . Furthermore, said integral spout holder type insert 26 is connected to the bearing housing 13 by a plurality of fixing screws (cap screws) 21 as explained in the first embodiment.

[0082] The integral nozzle bracket type insert 26 described above is secured to the turbine casing 10 fastened together with the outer peripheral flange of the bearing housing by bolts 25 through ring locks 27 .

[0083] I...

no. 3 example

[0087] Figure 4 is displayed corresponding to figure 2 A view of a third embodiment of the invention.

[0088] In the third embodiment, the insert 20 is formed in its outer peripheral portion with a flange 20s that is clamped between flanges formed at the outer periphery of the turbine casing 10 and the bearing housing 13. Between them, the parts thus clamped are joined together in a fluid-tight manner at their outer peripheries by connecting pieces 28 . Except for this structure, the configuration of the third embodiment is the same as that of the first embodiment, and therefore, the same reference numerals are used to denote the same components explained in the first embodiment.

[0089] In the third embodiment as described above, since the insert 20 can be connected in a fluid-tight manner by only a single connection piece 28, the number of constituent parts can be reduced. In addition, in the third embodiment, the three members, that is, the insert 20, the turbine hou...

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PUM

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Abstract

Provided is a variable-throat exhaust turbocharger in which a nozzle assembly including a nozzle mount and nozzle vanes has a firm support structure without affection by a thermal deformation of a turbine casing and an external force exerted to the turbine casing, and a scroll portion is formed in a substantially opened configuration so that the nozzle assembly can be simply formed in order to reduce the number of mold cores for a scroll during casting of the turbine casing, and thereby it is possible to enhance the productivity of the turbine casing.

Description

technical field [0001] The present invention relates to a mounting structure for a variable nozzle mechanism used in a variable throat exhaust (exhaust gas) turbocharger through a A scroll and a plurality of nozzle vanes direct exhaust from the engine (internal combustion engine) to apply the exhaust to the turbine rotor, and the nozzle mechanism is configured to vary the nozzle vanes blade angle. Background technique [0002] Patent Document 1 (Japanese Laid-Open Patent No. 2001-207858) discloses an example of a relatively small turbocharger for an internal combustion engine of a motor vehicle or the like, and in the turbocharger, a turbine housing is filled with The engine exhaust gas inside the scroll is supplied through a plurality of nozzle fins provided on the inner peripheral side of the scroll, and then applied to the turbine rotor provided on the inner peripheral side of the nozzle fins. In addition, a variable throat radial flow exhaust turbocharger equipped with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B37/24F01D17/16
CPCF01D17/165F05D2220/40F02B37/22F02B37/24F02B39/00
Inventor 阵内靖明宫内亮上野阳一林慎之横山隆雄
Owner MITSUBISHI HEAVY IND LTD
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