Securing element and exhaust gas turbocharger having variable turbine geometry

A technology for fixing components and exhaust gas turbines, applied in the directions of threaded fasteners, connecting components, screws, etc., can solve problems such as expansion of blade flow loss, loss of spiral prestress, damage to blade cascade devices, etc., to improve work reliability and plasticity. The effect of reducing the risk of brittleness and embrittlement and the possibility of failure

Inactive Publication Date: 2011-03-30
CONTINENTAL AUTOMOTIVE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to this, the screw tends to become embrittled and plasticized, especially in the heavily loaded areas of the screw-in and screw head, thus resulting in a loss of helical prestress and, in severe cases, fatigue fracture of the screw
In the event of a loss of helical prestress, the dimensional accuracy of the VTG guide vane arrangement is no longer guaranteed
Increased clearance of the guide vanes in the vane space, resulting in increased flow losses over the guide vanes, which impairs the overall efficiency of the exhaust gas turbocharger
In addition, due to the loss of prestressing force of the screws, there is also the risk of the screws loosening completely due to vibrations, which eventually leads to complete destruction of the VTG guide vane arrangement
The fatigue fracture of the screw leads to the immediate and complete failure of the VTG guide vane arrangement

Method used

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  • Securing element and exhaust gas turbocharger having variable turbine geometry
  • Securing element and exhaust gas turbocharger having variable turbine geometry
  • Securing element and exhaust gas turbocharger having variable turbine geometry

Examples

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Embodiment Construction

[0042] Identical or functionally equivalent elements are designated by the same reference numerals throughout the drawings, unless otherwise indicated.

[0043] figure 1 It is a side view of a first embodiment of the fixing element 1 of the present invention. The fixing element 1 has a head 2 and a shaft 3 . The head 2 is designed here as a screw head 9 integrally formed on the fastening element. On the side opposite the head 2 , the shaft 3 of the fastening element 1 has a thread 8 . The rod 3 of the fixing element 1 has, for example, a local taper 6 .

[0044] Figure 1a is a view of the bending moment distribution M(x) in a first embodiment of the fixing element according to the invention. The bending moment distribution M(x) is a function of the bar 3 ordinate x.

[0045] Figure 1b is a view of the bending stress distribution σ(x) in a first embodiment of the fixing element 1 according to the invention. The bending stress distribution σ(x) is a function of the bar...

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Abstract

The invention relates to a securing element (1) comprising a head section (2), a shank (3), the cross-section of said shank changing in the axial direction such that, by taking into account a qualitative and/or quantitative predetermined bending torque profile in the shank, the cross-section has an essentially uniform bending stress profile in the shank in relation to a securing element with a constant shank cross-section. The invention also relates to an exhaust gas turbocharger (11) having variable turbine geometry in which a VTG-guide vane arrangement (15) comprising at least one securing element (1) of said type is secured to a housing component (12) of the exhaust gas turbocharger.

Description

technical field [0001] The invention relates to a fastening element, in particular for an exhaust gas turbocharger with variable turbine geometry, and to an exhaust gas turbocharger with variable turbine geometry having the fastening element. Background technique [0002] Although the motivation and concept of the invention are explained below using the example of a fixing screw for fixing a guide vane cascade of an exhaust gas turbocharger with variable turbine geometry (VTG), the invention is not limited to such a fixing The screw is also not limited to the use of fastening screws for fixing guide vane cascades in such exhaust gas turbochargers. [0003] The advantage of an exhaust gas turbocharger with a variable turbine geometry compared to an exhaust gas turbocharger with a rigid turbine geometry is that the inlet cross-section at which the hot exhaust gas is directed to the turbine of the exhaust gas turbocharger can be made possible by means of Adjustable guide adjus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B5/02F16B35/04
CPCF16B35/041
Inventor R·贝宁D·弗兰肯斯坦H·费特M·希勒
Owner CONTINENTAL AUTOMOTIVE GMBH
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