Exhaust gas turbocharger for an internal combustion engine

• US 20060096287A1
• Filed: 06/24/2003
• Published: 05/11/2006
• Est. Priority Date: 07/20/2002
• Status: Active Grant

• Current Assignee: Daimler AG (Mercedes-Benz Group AG)
• Original Assignee: Daimler AG (Mercedes-Benz Group AG)
• Inventors: Sumser, Siegfried, Fledersbacher, Peter, Loffler, Paul, Finger, Helmut, Weimann, Hans-Jurgen
• Granted Patent: US 7,350,356 B2
• Time in Patent Office: Days
• US Class Current: 60/605.1
• CPC Class Codes: F01D 17/143 the shiftable member being a wall, or part thereof of a radial diffuser
• CPC Class Codes: F01D 17/167 of vanes moving in translation
• 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: F04D 29/4213 suction ports
• CPC Class Codes: F04D 29/464 adjusting flow cross-section, otherwise than by using adjustable stator blades
• CPC Class Codes: F05D 2220/40 in turbochargers
• CPC Class Codes: F05D 2250/51 Inlet
• CPC Class Codes: F05D 2260/14 Preswirling

Abstract

An exhaust gas turbocharger for an internal combustion engine has an exhaust gas turbine in the exhaust gas train and a compressor in the intake tract, whereby an adjustable throttle device is provided upstream from the compressor wheel, for regulating the air mass stream to be supplied. The throttle device comprises a first guide grid and a second guide grid in the inflow region to the compressor wheel. Each guide grid possesses an adjustable grid geometry.

Claims

1. Exhaust gas turbocharger for an internal combustion engine, having an exhaust gas turbine (4) in the exhaust gas train (3) and a compressor (6) in the intake tract (5), whereby a compressor wheel (16) is disposed in a compressor wheel inflow channel (14), which wheel is driven by a turbine wheel of the exhaust gas turbine (4), having an adjustable throttle device upstream from the compressor wheel (16), for regulating the air mass stream to be supplied, wherein the throttle device comprises a first guide grid (12) and a second guide grid (13) in the inflow region to the compressor wheel (16), whereby each guide grid (12, 13) has an adjustable grid geometry.

2. Exhaust gas turbocharger as claimed in claim 1, wherein the two guide grids (12, 13) are spaced axially apart.

3. Exhaust gas turbocharger as claimed in claim 1, wherein

the grid geometries comprise one guide grid ring (18, 24), in each instance, having guide vanes and an accommodation matrix (19, 25) for accommodating the guide grid rings (18, 24).

4. Exhaust gas turbocharger as claimed in claim 1, wherein the setting movements of the grid geometries of the two guide grids (12, 13) are coupled by way of a common activation organ.

5. Exhaust gas turbocharger as claimed in claim 4, wherein the common activation organ comprises an axially adjustable sliding sleeve (17).

6. Exhaust gas turbocharger as claimed in claim 3, wherein the sliding sleeve (17) has an accommodation matrix (19) in the region of a first axial face, and a guide grid ring (24) in the region of the opposite axial face.

7. Exhaust gas turbocharger as claimed in claim 1, wherein each grid geometry has an activation organ assigned to it, in each instance.

8. Exhaust gas turbocharger as claimed in claim 7, wherein the two activation organs are configured as a sliding sleeve (17, 26), in each instance.

9. Exhaust gas turbocharger as claimed in claim 7, wherein an activation organ (26) forms a spin surface (28) for the air mass stream that flows through, in the opened position of a guide grid.

10. Exhaust gas turbocharger as claimed in claim 1, wherein an air collection chamber (15) that communicates with the compressor wheel inflow channel (14) lies ahead of the compressor wheel (16), whereby at least one guide grid (12, 13) is disposed in the transition from the air collection chamber to the compressor wheel inflow channel.

11. Exhaust gas turbocharger as claimed in claim 10, wherein the air collection chamber (15) surrounds the compressor wheel inflow channel (14) radially, at least in part.

12. Exhaust gas turbocharger as claimed in claim 1, wherein a guide grid (12) has at least two segments (24a, 24b, 24c) having different grid geometries over its axial expanse.

13. Exhaust gas turbocharger as claimed in claim 12, wherein the segments (24a, 24b, 24c) each have a different number of guide grid vanes.

14. Exhaust gas turbocharger as claimed in claim 12, wherein the guide vanes of the guide grid (12) continuously undergo a shortening of the chord length with an increasing vane height, proceeding from a bottom vane height.