DE102011007720A1 - Turbo supercharger for use in internal combustion engine of motor vehicle to compress fuel-air mixture, has exhaust system whose waste gate is partially and actively connected with actuator by Bowden cable - Google Patents

Abstract

In summary, the invention relates to a turbocharger for mixture compression for internal combustion engines with a turbine arranged in a hot housing 15, wherein the hot housing 15 at least partially forms an exhaust gas duct provided for driving the turbine, and the exhaust gas duct has a wastegate 16 which can be controlled by an actuator 14 for peak relief of the turbine. With the aim of reducing the assembly costs, simplifying the adjustment process of the wastegate and being able to use cheaper actuators, it is proposed that the operative connection between actuator 14 and wastegate 16 is at least partially formed by a Bowden cable 11, 12. As a result, the actuator 14 can be arranged outside the hot housing 15, must therefore withstand lower operating temperatures and can be set more easily. Actuators from different manufacturers are also easier to use.

Description

Field of the invention

The invention relates to a turbocharger for mixture compression for internal combustion engines with a turbine arranged in a hot housing, wherein the hot housing at least partially designed to drive the turbine exhaust system and the exhaust system for peak relief of the turbine has a controllable by means of an actuator wastegate.

State of the art

Background of the invention

A wastegate is used in turbochargers to regulate the exhaust flow at peak load such that the turbine of the turbocharger can not convert any additional kinetic energy. Thus, the speed of the turbocharger axle is effectively throttled if further compression of the fuel-air mixture to be sucked in would be necessary or even detrimental to the engine.

The wastegate consists of a gas diverter within the hot box, which is actuated as needed by an actuator to regulate the exhaust gas flow.

The operative connection between actuator and wastegate is usually mechanical, but can also be hydraulic ( US 2006/0064980 A1 ) or pneumatic ( EP1 486 678 A2 ) be implemented.

The mechanical engagement requires an actuator located near the hot housing, which must then withstand appropriate temperatures.

A pneumatic connection requires, similar to the hydraulic, a tube system, which must be sealed in order to transfer the control pressure from the actuator to the wastegate and is therefore maintenance-intensive.

task

Summary of the invention

The object of the invention is therefore to provide a turbocharger which is easy to install, has few components and also eliminates the disadvantages of the known prior art, without affecting the functionality of the wastegate.

The object is achieved by a wheel bearing unit of the type mentioned above in that the operative connection between the actuator and wastegate is at least partially formed by a Bowden cable, which has the function of a mechanical control line. The Bowden cable is a mechanical solution that is dimensionally stable only in the direction of pull. The Bowden cable activates the wastegate when tightening, so that throttling of the turbocharger only occurs when pulling. Alternatively, the throttling could be switched off at train, so that only when the Bowden cable is tightened, the turbocharger is operable. This would prevent the turbocharger from being damaged if the actuator or its failure fails. In case of damage, the turbocharger would simply shut off by strain relief.

Advantageously, the Bowden cable is arranged in the operative connection between the actuator and wastegate and on a fixed part, in particular a part of the chassis or the body, fastened. There may well be other mechanical elements to participate in the operative connection, such as, control rods.

Preferably, the Bowden cable is formed of a protective cover and a soul, wherein the actuator is provided to move the soul relative to the protective cover. The soul serves to transmit the actuating movement and the protective cover protects the soul from environmental influences, such as, for example, water or other foreign particles.

In a preferred embodiment, the protective cover consists of a plurality of protective covers arranged inside one another. A first protective cover could protect against external mechanical influences, such as a first protective metal cover. A second protective cover could be made of plastic and used against moisture.

Advantageously, the protective cover is connected directly or indirectly to the hot housing and to a housing of the actuator or to the actuator. Under the hot housing, the housing part of the turbocharger is understood, which directs the exhaust stream and in which the turbine of the turbocharger is arranged. This hot housing also provides support for the non-movable protective cover or protective covers. In an advantageous embodiment, the core is indirectly or directly connected to a closing element of the wastegate and to a movable part of the actuator. For this purpose, retaining elements, for example in the form of thickenings or bolts, may be provided on at least one or both ends of the core.

Advantageously, the soul is formed mehrgliedrig, whereby although a longitudinal feed or train is possible, however, a radial side force is not transmitted further.

Furthermore, the soul can be advantageously made of metal or plastic. Plastic is lighter and does not rust. With metal, the risk of breakage is lower.

The same applies to the protective cover, which can be made of either metal or plastic.

In an advantageous embodiment, the actuator is arranged on or in the compressor housing, with which an activation of the actuator does not have to take place by means of the hot air flow, but can be activated by the air flow of the compressor. Thus, no additional hoses from the hot housing to the actuator are necessary, but one makes use of the mechanical coupling between the compressor and turbine.

Another advantage of attaching the actuator to the compressor housing, which is also a partial housing of the turbocharger and directs the flow of cold air from the compressor in the direction of the internal combustion engine, that the actuator is installed in the installation of the turbocharger together with this. This saves the automaker the step of attaching the actuator and its calibration.

Further advantageous embodiments and preferred developments of the invention can be taken from the description of the figures and / or the dependent claims.

In the following the invention will be described and explained in more detail with reference to the exemplary embodiments illustrated in the figures.

Show it:

1 a turbocharger with arranged in a hot housing, activated by a Bowden cable wastegate, and

2 a side view of the hot housing on 1 ,

embodiment

Description of the drawings

1 and 2 show a turbocharger with Bowden cable, which allows a great freedom of design. The actuator 16 is arranged on the compressor housing. For example, the actuator 16 but also attached to another fixed part, such as another engine component, or other fixed component of the motor vehicle. Thus, assembly costs can be reduced and process reliability can be increased.

The wastegate 17 is for heat avoidance on the compressor housing 18 , at some distance from the hot box 13 arranged. The protective cover 11 is on the housing of the wastegate 17 attached, which equally a part of the housing 18 formed.

The train soul 12 Can in the fixed protective cover 11 be actuated by the actuator 16 over the entrance 14 the control line is set in motion and the wastegate 17 operated via the Zugseele, ie this opens or closes.

The adjustment or calibration process may be factory-made by the turbocharger manufacturer. In addition, the number of purchased parts will be reduced.

In summary, the invention relates to a turbocharger for mixture compression for internal combustion engines with a in a hot housing 15 arranged turbine, wherein the hot housing 15 a provided for driving the turbine exhaust system at least partially and the exhaust system for peak relief of the turbine by means of an actuator 14 controllable wastegate 16 having. With the aim to reduce the assembly costs, to simplify the adjustment process of the wastegate and to be able to use cheaper actuators, it is proposed that the operative connection between actuator 14 and wastegate 16 at least partially by a Bowden cable 11 . 12 is formed. This allows the actuator 14 outside the hot box 15 Therefore, it must withstand lower operating temperatures and be easier to adjust. In addition, thus actuators of different manufacturers are easier to use.

LIST OF REFERENCE NUMBERS

10

flange

12

Zugseele

14

Input of the control line

16

actuator

18

compressor housing

11

cover

13

hot housing

15

fixed part

17

wastegate

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2006/0064980 A1 [0004]
• EP 1486678 A2 [0004]

Claims (10)

Turbocharger for mixture compression for internal combustion engines with one in a hot housing ( 13 ) arranged turbine, wherein the hot housing ( 13 ) at least partially forms an exhaust duct provided for driving the turbine, and the exhaust duct for peak relief of the turbine is formed by means of an actuator ( 16 ) controllable wastegate ( 17 ), characterized in that the operative connection between actuator ( 16 ) and wastegate ( 17 ) at least partially by a Bowden cable ( 11 . 12 ) is formed. Turbocharger according to claim 1, wherein the Bowden cable ( 11 . 12 ) in the operative connection between actuator ( 16 ) and wastegate ( 17 ) and on a fixed part ( 15 ), in particular a part of the chassis or the body, can be fastened. Turbocharger according to one of the preceding claims, wherein the Bowden cable ( 11 . 12 ) from a protective cover ( 11 ) and a train soul ( 12 ) is formed and the actuator ( 16 ) is provided, the Zugseele ( 12 ) relative to the protective cover ( 11 ) to move. Turbocharger according to claim 3, wherein the protective cover ( 11 ) consists of a plurality of nested protective covers. Turbocharger according to claim 3 or 4, wherein the protective cover ( 11 ) with the hot housing ( 13 ) and the actuator ( 16 ) or its housing is connected. Turbocharger according to claim 5, wherein the train soul ( 12 ) with a closing element of the wastegate ( 17 ) and with a movable part of the actuator ( 16 ) is directly or indirectly connected. Turbocharger according to one of the preceding claims, wherein the Zugseele ( 12 ) is formed mehrgliedrig. Turbocharger according to one of the preceding claims, wherein the Zugseele ( 12 ) is made of metal or plastic. Turbocharger according to one of the preceding claims, wherein the protective cover ( 11 ) is made of metal or plastic. Turbocharger according to one of the preceding claims, wherein the actuator ( 16 ) on or in a compressor housing ( 18 ) of the turbocharger is arranged.

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