Exhaust gas turbocharger, in particular for a motor vehicle
First Claim
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
/η
≦
2.4.
2 Assignments
0 Petitions
Accused Products
Abstract
An exhaust gas turbocharger may include a turbine housing and a turbine wheel. The turbine wheel may include a first quantity of a plurality of moving blades. The turbine wheel may be rotatable relative to the turbine housing about a turbine wheel center of rotation and have a turbine wheel radius. A variable turbine geometry may include a blade bearing ring on which a second quantity of a plurality of guide blades are rotatably mounted in each case about a guide blade center of rotation. The plurality of guide blades may be adjustable between a closed position, in which a flow cross section between the guide blades for an exhaust gas to flow through is at a minimum, and an opened position, in which the flow cross section is at a maximum.
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Citations
20 Claims
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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; andwherein 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
/η
≦
2.4. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An exhaust gas turbocharger for an internal combustion engine, comprising:
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a turbine housing and a turbine wheel disposed therein rotatable relative to the turbine housing about a turbine wheel centre of rotation, the turbine wheel defining a turbine wheel radius (RTR) and including a plurality of moving blades; a variable turbine geometry including a blade bearing ring and a plurality of guide blades rotatably mounted about a guide blade centre of rotation on the blade bearing ring, the plurality of guide blades adjustable between a closed position where a flow cross-section between the respective guide blades for an exhaust gas flow is at a minimum, and an opened position where the flow cross-section is at a maximum; the plurality of guide blades respectively having in a longitudinal profile a first profile nose facing away from the turbine wheel centre of rotation, a second profile nose facing towards the turbine wheel centre of rotation, and a profile chord defined by a first connecting line between the first profile nose and the second profile nose; wherein a spacing (RTE) of the second profile nose from the turbine wheel centre of rotation in the opened position of the plurality of guide blades and the turbine wheel radius (RTR) satisfy the following relationship;
1.03≦
RTE/RTR≦
1.06; andwherein a length (S2) of a second connecting line between two adjacent second profile noses in the opened position of the guide blades and an inlet width (S3) between two adjacent moving blades satisfy the following relationship;
0.45≦
S2/S3≦
3.2. - View Dependent Claims (14)
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15. An exhaust gas turbocharger for an internal combustion engine, comprising:
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a turbine housing and a turbine wheel disposed therein rotatable relative to the turbine housing about a turbine wheel centre of rotation, the turbine wheel defining a turbine wheel radius (RTR) and including a plurality of moving blades; a variable turbine geometry including a blade bearing ring and a plurality of guide blades rotatably mounted about a guide blade centre of rotation on the blade bearing ring, the plurality of guide blades adjustable between a closed position where a flow cross-section between the respective guide blades for an exhaust gas flow is at a minimum, and an opened position where the flow cross-section is at a maximum; the plurality of guide blades respectively having in a longitudinal profile a first profile nose facing away from the turbine wheel centre of rotation, a second profile nose facing towards the turbine wheel centre of rotation, and a profile chord defined by a connecting line between the first profile nose and the second profile nose; wherein a spacing (RTE) of the second profile nose from the turbine wheel centre of rotation in the opened position of the plurality of guide blades and the turbine wheel radius (RTR) satisfy the following relationship;
1.03≦
RTE/RTR≦
1.06; andwherein the first profile nose in the longitudinal profile of at least one guide blade of the plurality of guide blades defines an origin of a Cartesian coordinate system with an X-coordinate extending along the profile chord and a Y-coordinate extending orthogonally to the X-coordinate, the X-coordinate and the Y-coordinate of the following points being defined in the Cartesian coordinate system; xp, yp;
Cartesian coordinates of the guide blade centre of rotation,x1, y1;
a low point of a profile bottom side having a convex shape,x2, y2;
a height of the profile bottom side having a concave shape,x3, y3;
a height of a profile top side having a convex shape,x4, y4;
a high point of a centre line of the longitudinal profile,x5, y5;
an intersection of the profile bottom side having the convex shape with the profile chord,x6, y6;
an intersection of the profile bottom side having the concave shape with the profile chord; andwherein the at least one guide blade in the longitudinal profile includes the following relationship;
0≦
yp/y4≦
2;
0≦
yp/y1≦
5; and
0≦
y2/yp≦
0.7. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification