WO2014194990A1

WO2014194990A1 - Adjusting device for an exhaust gas turbocharger

Info

Publication number: WO2014194990A1
Application number: PCT/EP2014/001405
Authority: WO
Inventors: Klaus Sperling; Viktor Dick
Original assignee: Ihi Charging Systems International Gmbh
Priority date: 2013-06-03
Filing date: 2014-05-24
Publication date: 2014-12-11
Also published as: DE102013105677A1

Abstract

The invention relates to an adjusting device for an exhaust gas turbocharger having an exhaust-gas-conducting segment (3) through which flow is possible, wherein the exhaust-gas-conducting segment (3) has a bypass channel, which is used for the bypassing of a turbine wheel arranged in the in the exhaust-gas-conducting segment (3), comprising a first adjusting element (7) and a second adjusting element (9), wherein a valve element (5) for varying a flow cross-section of the bypass channel is provided indirectly or directly on the first adjusting element (7), and wherein the first adjusting element (7) and the second adjusting element (9) are connected to one another, wherein the first adjusting element (7) is designed to be received at a first end (11) of the first adjusting element facing the second adjusting element (9) by the second adjusting element (9) at a second end (13) of the second adjusting element facing the first adjusting element (7), in such a way that the first adjusting element (7) can protrude into the second adjusting element (9), wherein an outer contour surface (15) is formed on the first end (11) and an inner contour surface (14) is formed on the second end (13), the outer contour surface and the inner contour surface being complementary to each other. According to the invention, the outer contour surface (15) and the inner contour surface (14) are designed like polygon shapes in order to establish a rotationally fixed connection between the first adjusting element (7) and the second adjusting element (9).

Description

Adjustment device for an exhaust gas turbocharger

The invention relates to an adjusting device for an exhaust gas turbocharger in the

Preamble of claim 1 specified type.

The published patent application DE 10 2008 032 927 A1 discloses an adjusting device for an exhaust-gas turbocharger with an exhaust-gas guide section, wherein the

flow-through exhaust gas guide portion has a bypass channel, which serves to bypass a arranged in the exhaust gas guide section turbine wheel having. The adjusting device comprises a first adjusting member and a second adjusting member. At the first adjusting member, a valve element for varying a flow cross section of the bypass passage is provided. The first adjusting member and the second adjusting member are connected to each other, wherein the first adjusting member at its the second

Adjusting member facing formed first end of the second adjusting member, at the first adjusting member facing the second end, receivable

is designed. The first adjusting member is hineinragbar in the second adjusting member, wherein at the first end an outer contour surface and at the second end an inner contour laugh are formed complementary. For fixing the first adjusting member in the second adjusting member, a connecting element is provided, by means of which a

non-positive connection between the first adjusting member and the second

Adjustment can be achieved.

The problem is that due to the operation of the exhaust gas turbocharger, in particular in connection of the exhaust gas turbocharger with an internal combustion engine, the exhaust gas turbocharger is exposed to temperature fluctuations and body vibrations. The

Temperature fluctuations lead to a constant heating and cooling of the individual components of the exhaust gas turbocharger, in particular in the region of the exhaust gas guide section of the exhaust gas turbocharger, due to the combustion product of the internal combustion engine flowing through it, the greatest temperature fluctuations. The closer a component of the exhaust-gas turbocharger is arranged to a passage of the exhaust-gas guide section having the combustion product passing through it, the higher the probability of failure of this component. Because the constantly repeating temperature changes lead to a constant change of the

Expansion of the components, causing loosening, tension or

Material fatigue can come. The connection between the first adjusting member and the second adjusting member is as a rigid connection by means of the one

Pressure-exerting securing element configured, and positioned near the combustion product having duct. Consequently, the subject

Versteilglieder and the fuse element the aforementioned

Temperature fluctuations.

Due to occurring during operation of the engine component movements, such as, for example, a lifting movement of the piston, an associated rotational movement of the crankshaft, or rotational movements of the camshaft, it can also come to solid or body vibrations. Since the exhaust gas turbocharger is mechanically connected to the internal combustion engine, these solid-state vibrations can bring disturbing noises in the form of rattling or rattling of the adjusting device of the exhaust gas turbocharger. In addition, pulsations and vibrations of combustion gases of the internal combustion engine due to their flow through the exhaust gas guide section and in particular due to the flow through the bypass passage on the practice

Valve element and thus on the associated with him Versteilglieder additional forces that reinforce the solid state vibrations of the adjustment and the associated rattle and rattling noises.

Furthermore, these solid-state oscillations can also lead to a loosening of originally firm connections, which can ultimately lead to a reduced operational safety, but at least a limitation of one

Functionality can result. For example, that too

Securing element, which brings about the frictional connection between the first adjusting member and the second adjusting member, due to

Solid state vibrations are loosened, so that the frictional connection is released.

The object of the present invention is to provide an inexpensive adjusting device for an exhaust gas turbocharger, which at the same time an increase in the

Operational safety and an increase in the efficiency of the exhaust gas turbocharger brought about. This object is achieved by an adjusting device for an exhaust gas turbocharger having the features of patent claim 1. Advantageous embodiments with

expedient and non-trivial developments of the invention are specified in the remaining claims.

The adjusting device according to the invention for an exhaust gas turbocharger has for

Producing a rotationally fixed connection between the first Versteilglied and the second Versteilglied an outer contour surface of the first Verstellgliedes and a

Inner contour surface of the second Versteilgliedes, which are formed polygonformartig. The outer contour surface and the inner contour surface have in the axial direction an extension of the same length, so that over a circumference of an inner contour of the second Versteilgliedes or over the circumference of an outer contour of the first

Versteilgliedes an inner contour surface or an outer contour surface is formed. With the help of this polygonal shaped outer contour surface of the first adjusting member and the correspondingly complementary formed inner contour surface of the second adjusting member, it is possible to provide a rotationally fixed connection, which is brought about by means of a positive connection due to the complementary design.

On the other hand, with the help of polygonal-like design of the interior and

Outside contour surface and a secured frictional connection brought about, since due to the polygonal shape within a contour surface at least two side surfaces are formed, which are arranged deviating from a parallel arrangement on the contour surface. If, for example, due to the influence of temperature, a distortion of a side surface of the inner contour surface results, such that this side surface no longer has sufficient frictional connection with the side surface of the outer contour surface positioned opposite to it, at least the other side surface is

Inner contour surface with the side surface of the opposite side positioned

Outer contour surface due to the complementary formation of indoor and

Outer contour surface in sufficient adhesion.

This means that under the exhaust gas guide section in the operation of

Exhaust gas turbocharger present, in particular frequent temperature change operating conditions, with the aid of the adjusting device according to the invention a secure actuation of the valve element can be brought about. In addition, the task of bringing about an increase in the efficiency of the exhaust gas turbocharger with the aid of the adjustment device according to the invention is likewise fulfilled, since due to the secure connection between the first adjustment member and the second adjustment member, a hysteresis behavior of the adjustment device is largely reduced.

The hysteresis of the adjustment shows up in the fact that in the course of the operating time of the exhaust gas turbocharger a change of an opening or

Schlieiicharakteristik the adjustment occurs in appearance. This change leads to a reduction in the efficiency of the exhaust gas turbocharger, since the opening or closing of the bypass passage is delayed.

Each exhaust gas turbocharger is dependent on a particular internal combustion engine to achieve a specific torque and power curve of

Internal combustion engine designed. These curves are dependent on a funded amount of fresh air to supply the internal combustion engine with fresh air and a certain amount of exhaust gas and their thermodynamic

Parameters which causes a certain exhaust back pressure in the exhaust gas guide section. However, the internal combustion engine supplies the amount of exhaust gas in

Connection with the amount of fresh air delivered by the turbocharger. Thus, a dependence between the internal combustion engine and the exhaust gas turbocharger is brought about. This dependency creates the need for a precise match between a performance of the exhaust gas turbocharger under certain

Thermodynamic parameters and the required characteristics or the required power spectrum of the internal combustion engine.

This vote means in an exhaust gas turbocharger with an adjustment of the specified type that when a certain charge pressure of the

Exhaust gas turbocharger the bypass channel is opened. If the time of the opening deviates from this point in time due to mechanical conditions of the adjusting device, such as caused by hysteresis, for example, this changes

Operating point of the exhaust gas turbocharger and thus its efficiency. Of the

Exhaust gas turbocharger is tuned in its performance on the internal combustion engine that the highest possible efficiency of the exhaust gas turbocharger can be achieved.

For example, an opening of the bypass channel in response to a certain boost pressure is provided. A control takes on this boost pressure and should cause an opening of the bypass passage with the aid of the adjusting device. Due to the Hysteresis of the adjustment device, however, the opening does not occur to one

originally scheduled date but delayed. This leads to a change in a fresh air delivery of the exhaust gas turbocharger and thus to a change in the operating conditions of the internal combustion engine, which incidentally also the emission behavior associated with the exhaust gas turbocharger

Internal combustion engine is affected. Furthermore, this inevitably leads to a deviation of the operating point of the exhaust gas turbocharger from an originally provided operating point, which predominantly has a higher efficiency than the operating point, which adjusts due to the hysteresis.

With the help of the adjusting device according to the invention, it is thus possible to bring about an increase in the efficiency of the exhaust gas turbocharger due to the reduction of the hysteresis.

Another advantage of the adjustment device according to the invention is an achievable simplified assembly, as with the help of polygonformartig designed inner contour surface and outer contour surface, which are complementary, an assignment to each other and thus a spatial assignment of the first Versteilgliedes and the second Versteilgliedes are fixed to each other.

In particular, in the embodiment of the adjusting device according to the invention, wherein the outer contour surface and the inner contour surface each axisymmetric to a

Symmetryeachse are formed, and in particular if the axis of symmetry corresponds to a longitudinal axis of the second Versteilgliedes, the spatial assignment of the first Versteilgliedes and the second Verstellgliedes is precisely defined, so that incorrect assembly of the components can be almost excluded.

In a further embodiment of the adjustment device according to the invention, at least one first side edge and one second side edge of the outer contour surface and the inner contour surface are designed oppositely aligned with respect to the axis of symmetry. This has the advantage that tensile and compressive forces which, when opening and closing the bypass channel in particular to the connection between the first adjusting member and the second VerStellglied and thus in particular to the

Outer contour surface and inner contour surface act opposite to the first

Side edge and can act on the second side edge. For example, when opening the bypass channel on the first side edge of the outer contour surface Tensile stressed, the second side edge of the outer contour surface, which is formed axially symmetrically opposite to the first side edge, subjected to pressure. In the reversal process of closing the second side edge of the outer contour surface is subjected to train, wherein the first side edge of the

Outer contour surface is subjected to pressure. This means that the outer contour surface undergoes a uniform alternating stress, so that a wear of the outer contour surface appears evenly on the outer contour surface and thereby a one-sided and thus a functional inability inducing wear is substantially reduced.

The adjusting device according to the invention has the advantage that, in particular when forming a press fit between the outer contour surface and the

Inner contour surface an additional welding process can be avoided, which due to the high heat input into a between the outer contour surface and the

Inner contour surface formed connecting surface, could possibly cause a delay of the first Verstellgliedes and the second Versteilgliedes.

In a further embodiment of the adjusting device according to the invention, a securing element is formed on the first end of the first adjusting member for axial securing. With the help of the securing element, which is formed for example in the form of a so-called splint, the axial displacement of the first

Versteilgliedes against the second Versteilglied be prevented, so that in addition to securing a rotationally fixed connection between the first

Adjustment member and the second Versteilglied also an axial fixation of the two components to each other and thus the reliability is additionally secured.

In a further embodiment of the adjusting device according to the invention, the second adjusting member has at its turned away from the first adjusting member third end a receiving element for receiving a third Verstellgliedes

Adjusting device, wherein the receiving element integral with the second

Adjustment is formed. Usually, a connection of the third takes place

Versteilgliedes with the second adjusting member via other connecting elements which produce a force and / or a positive connection. The connection between the second adjusting member and the third adjusting member is in the form of a movable

Compound formed, in other words, the third adjustment is relative to second adjusting movable or the second adjusting member is movable relative to the third adjusting member.

As already mentioned, the adjustment is subject to temperature and

Vibration influences, which can cause a relaxation of the connection between the second adjusting member and the third adjusting member. A result of such relaxation is an increase of noise, for example in the form of rattles or

Schettern, because the dissolved fasteners can beat each other during operation of the exhaust gas turbocharger.

If the connection between the second adjusting member and the third adjusting member is formed with the aid of the integral formation of the receiving element with the second adjusting member, a noise-reduced adjusting device is provided, since the third adjusting member can be connected to the receiving element in a simple manner.

For example, an opening on the receiving element facing the end is provided on the third adjusting, in which the receiving element can be inserted. For axial securing simple securing elements, such as, for example, a split pin, can be provided.

Ideally, the receiving element is designed in the form of a bolt, so that, for example, by means of a simple plug connection, a movable connection between the second adjusting member and the third adjusting member can be brought about.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. The features mentioned above in the description and

Feature combinations as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures are not only in the respectively indicated combination but also in others

Combinations or alone, without departing from the scope of the invention.

The drawing shows in: a perspective view of a section of an exhaust gas turbocharger with an adjusting device according to the prior art, a perspective view of a portion of the adjusting device for an exhaust gas turbocharger gem. 1, a perspective view of a portion of an adjusting device according to the invention in a first embodiment, a perspective view of a first Verstellgliedes of

Adjusting device according to the invention. Fig. 3, a plan view of a second Verstellgliedes the adjusting device according to the invention. Fig. 3, a plan view of a first end of the first Verstellgliedes gem. Fig. 3, a perspective view of a portion of the adjusting device according to the invention in a second embodiment, a plan view of the second Verstellgliedes the adjusting device according to the invention. 7, a perspective view of a portion of the adjustment device according to the invention in a third embodiment, a perspective view of a portion of the adjustment device according to the invention in a fourth embodiment, a perspective view of the second adjustment member of

Adjusting device according to the invention. 10, a perspective view of a portion of the adjusting device according to the invention in a fifth embodiment and Fig. 13 is a detail of the perspective view of the invention

Adjusting device acc. Fig. 12.

An adjusting device 1 of an exhaust gas turbocharger 2 according to the prior art is formed as shown in Fig. 1. The exhaust gas turbocharger 2 has a flow-through exhaust gas guide section 3, which is traversed by exhaust gas during operation of the exhaust gas turbocharger 2 from a fluid, as a rule. The exhaust gas is generally a combustion product of an internal combustion engine, not shown.

The exhaust gas turbocharger 2 is a non-illustrated throughflow

Air guide portion and a positioned between the exhaust guide portion 3 and the air guide portion, not shown in detail associated bearing portion, wherein in the bearing portion, a not-shown rotor is rotatably received. The running gear has a not-shown compressor wheel and a not-shown turbine wheel, which together with the help of a not closer

shaft shown rotatably connected. The compressor wheel is arranged in a non-illustrated first wheel chamber of the air guide section for sucking in generally fresh air and the turbine wheel is rotatable in a second wheel chamber of the exhaust gas guide section 3, not shown

added.

The turbine is in the operation of the exhaust gas turbocharger 2 of the

Exhaust gas flowing portion 3 exhaust flowing and driven, where it can perform a rotational movement. This rotational movement is transferable by means of the shaft to the compressor wheel, which thus simultaneously to the rotational movement of the

Turbine wheel can perform a rotary motion. With the help of the compressor wheel and its rotary motion fresh air is sucked in, which is compressed in the air guide section.

The exhaust gas turbocharger 2 is designed as a so-called wastegate loader, that is, it has a device 4 for complete or partial bypassing of the turbine wheel. This device 4, hereinafter referred to as a bypass device, comprises, in addition to a bypass channel not shown in detail in the exhaust gas guide section 3, a bypass channel which is designed to be closable and illustrated in FIG. 2

Valve element 5, preferably in the form of a flap, generally as a wastegate Flap or waste gate valve designates, as well as the adjusting device 1 for actuating this valve element. 5

This adjusting device 1 has an adjusting element 6, usually a so-called pressure box, which can be removed with the aid of an air guide section

Boost pressure to open or close the bypass channel using the

Valve element 5 initiated. Likewise, an electronically or electrically trained actuator 6 is conceivable, which is designed to initiate opening and closing of the bypass channel. In other words, that means using the

Valve element 5 is a varying flow cross section of the bypass passage of the exhaust gas guide section 3 can be realized.

Trained according to the prior art adjusting device 1 comprises in addition to the valve element 5 and the adjusting element 6, a first adjusting member 7, which is formed predominantly in the form of a shaft, a lever arm 8, which the

Adjusting member 7 is formed connecting to the valve element 5 and a second adjusting member 9, which here in the form of a cranked, plate-shaped

Connecting element for connecting the first Versteilgliedes 7 with a third adjusting member 10 in the form of an actuating rod of the adjusting device 1 is configured.

The first adjusting member 7 and the second adjusting member 9 are mutually non-rotatable, in other words, rigidly or immovably connected to each other. The first adjusting member 7 has at its first end 11, which is the second adjusting member 9 facing, a cylindrical shape, such that this first end 11 in a circular, the second adjusting member 9 completely penetrating opening 12 of the second adjusting member 9 inserted or is hineinragbar. This opening 12 is arranged at a second end 13 of the second adjustment member 9, which is the first

Adjusting member 7 is formed facing.

An inner contour surface 14 of the opening 12 is formed complementary to an outer contour surface 15 of the first end 11. In this context, the term contour surface should be understood as meaning a contour surface extending in the axial direction, such that, due to the axial extension, a surface is formed like a jacket or a sleeve. An adjusting device 1 according to the invention is gem. Fig. 3 formed. To secure a rigid or immovable connection between the first adjusting member 7 and the second adjusting member 9 are the

lnnenkonturfläche14 of the opening 12 of the second Versteilgliedes 9 and the

Außenkonturfläche 15 of the first adjusting 7 polygonal-shaped, in this

Embodiment trapezoidal shape, formed, wherein base sides 16, 17 of the trapezoidal inner contour surface 14 and outer contour surface 15 are formed in a circular arc. Likewise, these bases 16, 17 of a trapezoidal shape

be designed according to parallel.

FIG. 4 shows in a perspective view the first adjusting member 7 of FIG

adjusting device 1 according to the invention. The first end 11 of the first adjusting member 7, shown in a plan view in Fig. 6, has the polygonal shape formed

Outer contour surface 15 on. This outer contour surface 15 can be produced very easily, for example by means of a milling method. The complementary to

Außenkonturfläche 15 formed Innenkonturfläche14 of the opening 12 of the second Verstellgliedes 9 is, for example, by means of a thermoforming method or

Punching process to produce.

For axial securing of the rigid or immovable connection of the first

Adjustment member 7 with the second adjusting member 9 is ideally provided an interference fit, such that in addition to the positive connection between the first adjustment member 7 and the second adjustment member 9 frictionally connected connection is made. Thus, an axial displacement of the second adjusting member 9 along a longitudinal axis 20 of the first adjusting member 7 can be avoided.

A second embodiment of the adjusting device 1 according to the invention is shown in Fig. 7 in a perspective view. A first end portion 11 having the first end portion 18 of the first adjusting member 7, the opening 12 of the second adjusting member 9 is formed completely penetrating. The first end 11 is positioned protruding out of the opening 12 in the axial direction of the first adjusting member 7, wherein the first end 11 is arranged on the side facing away from the valve element 5 side of the second adjusting member 9. Characterized in that the first end 11 and thus at least a portion of the first end portion 18 is positioned out of the opening 12 on the side facing away from the valve element 5 side of the first adjusting member 7 outstanding, It is possible, in a simple manner, a securing element 19 for securing the rotationally fixed connection between the first adjusting member 7 and the second

Adjusting member 9 with respect to an axial deposition of the first Verstellgliedes 7 and the second Verstellgliedes 9 to order. The securing element 19 is designed in the form of a simple so-called splint, as also shown in FIG. 8.

9 shows a perspective view of a portion of the adjustment device 1 according to the invention, a third embodiment, wherein the securing element 19 is formed in the form of a rivet. Also, the fuse could take the form of a

cohesive connection, such as, soldering or welding, be formed.

The outer contour surface 15 and the inner contour surface 14 are formed symmetrically to a second longitudinal axis 21 of the second Verstellgliedes 9, wherein in particular the first embodiment according to. 3 to 6, a first side edge 22 and a second side edge 23 of the Innenkonturfläche14 and the outer contour surface 15 with respect to the symmetry axis 21 opposite, in other words, mirror-symmetrically aligned formed having.

In a fourth embodiment according to. 10 and 11, the adjusting device 1 according to the invention is constructed in a simple embodiment. The opening 12 has a circular-segment-like Innenkonturfläche14, wherein the outer contour surface 15 of the first Verstellgliedes 7 is formed complementary.

A fifth embodiment is gem. Figs. 12 and 13 are formed. The

Control element 6, which causes a positioning of the valve element 5 by means of the third Verstellgliedes 10, is connected to the second adjusting member 9 at a third end 24 of the second Verstellgliedes 9, which is remote from the first adjusting 7, connected by means of a receiving element 25. The receiving element 25 is formed integrally with the second adjusting member 9. In this embodiment, the receiving element 25 is formed in the form of a bolt, wherein on a second adjusting 9 facing positioned end of the third Verstellgliedes 10, a receiving opening 26 for receiving the receiving element 25 is formed. Since the connection between the second adjusting member 9 and the third adjusting member 10 is to be formed in the form of a movable connection, that is, in other words, the third adjusting member 10 is movable relative to the second adjusting member 9, is ideally the receiving element 25 forms a shape of a cylinder and the receiving opening 26 in the form of a circular surface formed complementary thereto. Likewise, the receiving opening 26 could also have a uniformly distributed on its circumference investment profile, but at least three contact points should be configured to bear the receiving element 25 on the correspondingly formed peripheral surface of the receiving opening 26. The contact points are to be distributed uniformly over the circumference of the receiving opening 26 for secure movement, so for example, at three contact points, an angular distance of the contact point of 120 ° would be formed.

In order to prevent a loosening of the connection formed between the second adjusting member 9 and the third adjusting member 10, a securing element can also be provided on the end of the receiving element 25 which is remote from the second adjusting member 9. This can be, for example, a split pin or a retaining ring, for example in the form of a so-called snap ring.

Claims

claims

Adjustment device for an exhaust gas turbocharger with a flow-through

Exhaust gas guide section (3), wherein the exhaust gas guide section (3) has a

By-pass channel, which serves to bypass a turbine wheel arranged in the exhaust gas guide section (3), having a first adjustment member (7) and a second adjustment member (9), wherein on the first adjustment member (7) directly or indirectly a valve element (5) for varying a Flow cross-section of the bypass channel is provided, and wherein the first adjusting member (7) and the second adjusting member (9) are interconnected, wherein the first adjusting member (7) at its second adjusting member (9) facing the first end (11) from the second adjusting member (9), on whose first adjusting member (7) facing the second end (13), is designed to be receivable, such that the first adjusting member (7) in the second adjusting member (9) hineinrabar, wherein at the first end (11) an outer contour surface (15) and at the second end (13) an inner contour surface (14) are designed to be complementary,

characterized in that

for producing a rotationally fixed connection between the first adjusting member (7) and the second adjusting member (9), the outer contour surface (15) and the

Inner contour surface (14) are formed polygonformartig.

Adjusting device according to claim 1,

characterized in that

the outer contour surface (15) and the inner contour surface (14) are each formed axially symmetrical to an axis of symmetry (21).

Adjusting device according to claim 1 or 2,

characterized in that

the axis of symmetry (21) of a longitudinal axis (21) of the second adjusting member (9) equivalent.

4. adjusting device according to one of the preceding claims,

characterized in that

at least a first side edge (22) and a second side edge (23) of the outer contour surface (15) and the inner contour surface (14) with respect to

Symmetry axis (21) are formed aligned opposite.

5. adjustment device according to one of the preceding claims,

characterized in that

the outer contour surface (15) and the inner contour surface (14) are designed to produce a press fit.

6. adjusting device according to one of the preceding claims,

characterized in that

for axial securing a securing element (19) at the first end (1 1) of the first Verstellgliedes (7) is formed.

7. adjusting device according to one of the preceding claims,

characterized in that

between the first adjusting member (7) and the second adjusting member (9) a cohesive connection is formed.

8. adjustment device according to one of the preceding claims,

characterized in that

the second adjusting member (9) has a receiving element (25) for receiving a third adjusting member (10) of the adjusting device (1) at its third end (24) remote from the first adjusting member (7), wherein the

Receiving element (25) is integrally formed with the second adjusting member (9).

9. Adjusting device according to claim 8,

characterized in that

the receiving element (25) is designed in the form of a bolt.