Control arrangement of an exhaust-gas turbocharger

The invention relates to a control arrangement of an exhaust-gas turbocharger and to a turbine housing of an exhaust-gas turbocharger.

A control arrangement of said type and a turbine housing of said type are known from DE 20 2007 019 447 U1. Said document describes an exhaust-gas turbocharger having a control arrangement which has a control shaft for the actuation of a wastegate flap by means of an actuator, said control shaft being guided in a bearing bushing and being connected at its free end to an adjustment lever. On a lever surface pointing away from the bearing bushing of the control shaft, there is arranged a connecting piece to which a regulating rod of the actuator is connected.

It is an object of the present invention to provide a control arrangement and a turbine housing with which it is possible for the actuation of the control shaft to be optimized.

By virtue of the fact that the connecting piece is arranged on a lever surface, which faces toward the bearing bushing or toward a turbine wall in which the bearing bushing is arranged, of the connecting lever, it is possible for the actuation of the adjustment shaft to be relocated in the direction of the center of the bearing bushing, which improves the control characteristic of the control arrangement according to the invention and thus of the turbine housing according to the invention.

The dependent claims contain advantageous developments of the invention.

Further details, advantages and features of the present invention become apparent from the following description of an exemplary embodiment with reference to the drawing, in which:

FIG. 1 is a schematically highly simplified diagrammatic illustration of an exhaust-gas turbocharger according to the invention which can be provided with a control arrangement according to the invention and with a turbine housing according to the invention;

FIG. 2 shows an exploded illustration of a perspective view of the control arrangement according to the invention, and

FIG. 3 shows a sectional illustration through a turbine housing according to the invention.

FIG. 1 is a schematically highly simplified diagrammatic illustration of an exhaust-gas turbocharger 2 according to the invention which may have a turbine housing 17 , which will be described on the basis of FIG. 3 , and a control arrangement, which will be explained below on the basis of FIG. 2 .

As is conventional, the turbocharger 2 has a compressor 20 with a compressor wheel 21 in a compressor housing 22 , has the turbine housing 17 with a turbine wheel 25 and with a bypass opening 18 , and also has a bearing housing 23 that connects the compressor housing 22 and the turbine housing 17 . In the bearing housing 23 there is mounted a shaft 24 which, at its ends, bears the compressor wheel 21 and the turbine wheel 25 respectively.

FIG. 2 is a perspective exploded illustration of a control arrangement 1 according to the invention which can be used in an exhaust-gas turbocharger 2 of said type.

The control arrangement 1 has a bearing bushing 3 which is of cylindrical form in the example and which, on its outer circumferential surface, has an annular stop 11 .

Furthermore, the control arrangement 1 has a control shaft 4 which is connected at a first end 5 to a connecting lever 6 . As shown in FIG. 2 , the connecting lever 6 has a lever surface 8 facing toward the bearing bushing 3 and a lever surface 9 pointing away from the bearing bushing 3 . On the lever surface 8 facing toward the bearing bushing 3 , there is arranged a connecting piece 7 which may for example be connected to a regulating rod of a pneumatic controller.

In the particularly preferred embodiment illustrated in FIG. 2 , the control arrangement 1 also has a spacer disk 12 which, in the mounted state, lies against a face surface 13 of the bearing bushing 3 .

The control arrangement 1 may for example be connected to a control device 14 which is likewise illustrated in FIG. 2 , said control device in the illustrated example having a wastegate flap 15 which is arranged on a first end 16 A of a flap lever 16 .

The end 16 B of the flap lever 16 is designed to receive the end 10 of the control shaft 4 , such that in the final mounted state, the spacer disk 12 is arranged between the end 16 B and the face surface 13 of the bearing bushing 3 .

The control device 14 illustrated in FIG. 2 in the form of a wastegate arrangement is merely one example for a control device that can interact, by means of the control arrangement 1 according to the invention, with an actuator which is not illustrated in the figures. The use of the control arrangement 1 is however not restricted to a combination with a wastegate arrangement on a turbine housing, such as is illustrated in FIG. 3 .

The turbine housing 17 illustrated in FIG. 3 is provided with the control arrangement 1 that has been described on the basis of FIG. 2 . All of the components of said control arrangement 1 that have been described on the basis of FIG. 2 are denoted by the same reference numerals in FIG. 3 . As is also shown in FIG. 3 , the wastegate flap 15 closes a bypass opening 18 , or opens said bypass opening 18 when correspondingly actuated by the above-mentioned actuator which is however not illustrated in FIG. 3 , the control rod of which actuator engages on the connecting piece 7 .

FIG. 3 shows that the bearing bushing 3 is arranged in a passage recess 26 in a housing wall 19 of the bearing housing 17 , and bears by way of its stop 11 against a face surface of said housing wall 19 . FIG. 3 also shows here that, when the control arrangement 1 is in the mounted state in the turbine housing 17 , the connecting piece 7 points toward said housing wall 19 and thus likewise faces toward the bearing bushing 3 , whereas the lever surface 9 points away from said components, as is readily apparent from FIG. 3 .

The distance A also indicated in FIG. 3 shows that, owing to this orientation of the connecting piece 17 in the direction of the housing wall 19 or the bearing bushing 3 , the bearing bushing 3 can be lengthened significantly in relation to the prior art, which firstly improves the guidance of the control shaft 4 and secondly optimizes the actuation of the control shaft 4 , because said actuation can be relocated in the direction of the center of the bearing bushing 3 owing to the elongation thereof explained above.

In addition to the above written description of the invention, reference is hereby explicitly made, for additional disclosure thereof, to the diagrammatic illustration of the invention in FIGS. 1 to 3 .

1 Control arrangement

2 Exhaust-gas turbocharger

3 Bearing bushing

4 Control shaft

5 First end of the control shaft

6 Connecting lever

6 A First end of the connecting lever

6 B Second end of the connecting lever

7 Connecting piece

8 Lever surface facing toward the bearing bushing 3

9 Averted lever surface

10 Second end of the control shaft 4

11 Stop

12 Spacer disk

13 Face surface

14 Control device

15 Wastegate flap

16 Flap lever

17 Turbine housing

18 Bypass opening

19 Housing wall

20 Compressor

21 Compressor wheel

22 Compressor housing

23 Bearing housing

24 Shaft

25 Turbine wheel

L Longitudinal axis of the exhaust-gas turbocharger

A Distance