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Exhaust gas turbocharger, in particular for a motor vehicle

  • US 9,835,045 B2
  • Filed: 12/01/2014
  • Issued: 12/05/2017
  • Est. Priority Date: 11/29/2013
  • Status: Active Grant
First Claim
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1. An exhaust gas turbocharger, comprising:

  • a turbine housing;

    a turbine wheel including a first quantity of a plurality of moving blades, the turbine wheel being rotatable relative to the turbine housing about a turbine wheel centre of rotation and having a turbine wheel radius (RTR);

    a variable turbine geometry including a blade bearing ring and a second quantity of a plurality of guide blades disposed on the blade bearing ring, the plurality of guide blades respectively rotatably mounted about a guide blade centre of rotation, wherein the plurality of guide blades are adjustable between a closed position where a flow cross section between the guide blades for an exhaust gas to flow through is at a minimum and an opened position where the flow cross section is at a maximum;

    wherein each of the plurality of guide blades in a longitudinal profile includes a first profile nose facing away from the turbine wheel centre of rotation and a second profile nose facing towards the turbine wheel centre of rotation, and a straight connecting line between the first profile nose and the second profile nose defining a profile chord;

    wherein a spacing (RTE) of the second profile nose from the turbine wheel centre of rotation in the opened position of the guide blades and the turbine wheel radius (RTR) satisfy the following relationship;

    1.03≦

    RTE/RTR

    1.06; and

    wherein an angle (χ

    ) formed as an apex point with respect to the turbine wheel centre of rotation between two adjacent guide blade centres of rotation and an opening angle (κ

    ) of at least one of the plurality of moving blades in a longitudinal section satisfy the following relationship;

    0.4≦

    χ





    2.4.

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