Patent Application
20130330178
The invention relates to an insert element for a turbine of an exhaust gas turbo-charger, an exhaust gas turbocharger for an internal combustion engine, and a turbine for an exhaust gas turbocharger.
DE 25 39 711 discloses a spiral housing for continuous-flow machines, in particular in an exhaust gas turbocharger having a cross section that is adjustable at least in part, wherein at least one tongue that is slidingly guided on the radially inner wall of the spiral housing and can be displaced in connection with this wall in the circumferential direction is provided.
DE 10 2008 039 085 A1 discloses as known an, internal combustion engine for a vehicle comprising an exhaust gas turbocharger. The exhaust gas turbocharger comprises a compressor in an induction system of the internal combustion engine and a turbine in an exhaust gas system of the internal combustion engine, wherein the turbine has a turbine housing comprising a spiral port coupled to an exhaust gas line of the exhaust gas system, and a turbine wheel. The turbine wheel is arranged within an accommodating space of the turbine wheel and, for the purposes of driving a compressor wheel of the compressor connected via a shaft in a rotationally fixed manner to the turbine wheel, may be acted upon by exhaust gas from the internal combustion engine guided through the spiral port. The turbine comprises an actuating device by means of which a spiral entry cross section of the spiral port and a nozzle cross section of the spiral port can be jointly adjusted to the accommodating space.
There is further potential to reduce the production costs of known exhaust gas turbochargers.
It is the principal object of the present invention to provide an insert element for a turbine of an exhaust gas turbocharger, an exhaust gas turbocharger for an internal combustion engine and a turbine for an exhaust gas turbocharger, which result in lower exhaust gas turbocharger production costs.
In a turbine of an exhaust gas turbocharger an insert element which is provided for insertion into a turbine housing has a spiral port which extends in the circumferential direction of the insert element over at least part of the circumference thereof and by which the exhaust gas flow through the turbine is controlled. The insert element is open in the axial direction on at least at one end face thereof which end face is biased in sealing contact with the turbine housing. The insert element has a central axial opening with a spiral port for accommodating a turbine wheel.
The insert element can be produced particularly quickly and inexpensively owing in particular to the open design of the spiral port. The insert element is, for example, produced as a turned part and/or as a milled part, i.e. by turning and/or milling, or by some other production process, in particular involving cutting. It is also possible for the insert element o be designed as an investment cast part using an investment casting process. The insert element can also be produced through a combination of production processes, in particular the production processes described. Expensive and cost-intensive casting processes, for example with lost core, are unnecessary, in particular owing to the open design of spiral port. This keeps down the costs of producing the insert element and therefore the turbine, which advantageously allows particularly low production costs for the exhaust gas turbocharger.
In one advantageous embodiment of the invention, the spiral port is designed to be circumferentially completely open at least at one end face in the circumferential direction of the insert element and therefore of the turbine. This allows the particularly quick and inexpensive production of the insert element, resulting in low exhaust gas turbocharger production costs. When it comes to the series construction of motor vehicles, exhaust gas turbochargers are components which have to be produced in particularly large numbers, The low production costs made possible by the insert element according to the invention therefore have a particularly advantageous effect in reducing the costs of motor vehicles owing to economies of scale.
The insert element according to the invention also provides for a particularly favorable guidance of the exhaust gas flowing through the turbine, which, for example, is in the form of a radial turbine, to a turbine wheel of the turbine, which is arranged, in the assembled state of the exhaust gas turbocharger, within the insert element. The spiral port has an outlet opening which the turbine wheel is to be acted upon with exhaust gas flowing through the spiral port. In other words, the spiral port allows the exhaust gas to be guided such that the latter can flow towards the turbine wheel at least essentially in the radial direction of the insert element for driving the turbine wheel.
In one advantageous embodiment of the invention, the insert element has at least one further spiral port which extends in the circumferential direction of the insert element over at least part of the circumference thereof and through which the exhaust gas flowing through the turbine can flow, wherein the further spiral port is designed to be open at in part in the axial direction on at least one end face of the insert element. This means that the insert element can be produced particularly quickly and inexpensively even if a number of spiral ports, i.e. at least two, three or more, are provided. The insert element with the number of spiral ports also allows particularly favorable flow towards the turbine wheel so that the turbine can be operated particularly efficiently. This efficient operation of the turbine owing to the favorable flow conditions as far as the turbine wheel is concerned also has a very beneficial effect in terms of increasing the efficiency of the exhaust gas turbocharger as a whole, keeping down the fuel consumption and the CO2 emissions of an internal combustion engine assigned to the exhaust gas turbocharger which is to be charged using the exhaust gas turbocharger.
It is noted at this point that the insert element can also be used in an exhaust gas turbocharger of an internal combustion engine or for other fluid energy machines, in particular for charging units. The insert element according to the invention can for example be used in a charging unit for a turbo engine or for a fuel cell, In this case, exhaust gas from the fuel cell flows through the turbine, wherein the exhaust gas from the fuel cell can be guided to the turbine wheel in a particularly favorable way by means of the insert element according to the invention.
If the insert element according to the invention has a number of spiral ports, then they are arranged, for example, in the circumferential direction of the insert element behind one another and/or in the axial direction at the same height It is also possible for the spiral ports to be arranged in the axial direction of the insert element next to one another and/or in the circumferential direction at the same height. The corresponding arrangement of the spiral ports has to be matched here to the corresponding conditions of use of the turbine and chosen accordingly.
The second aspect of he invention relates to an exhaust gas turbocharger for an internal combustion engine, which comprises a turbine and at least one insert element, in particular an insert element according to the invention, accommodated at least in part in a turbine housing of the turbine. The insert element has at least one spiral port which extends in the circumferential direction of the insert element over at least part of the circumference thereof and through which the exhaust gas flowing through the turbine can flow, which spiral port is designed to be open at least in part in the axial direction of the exhaust gas turbocharger on at least one end face of the insert element. Advantageous embodiments of the first aspect of the invention are to be regarded as advantageous embodiments of the second aspect of the invention and vice versa. As already described in relation to the first aspect of the invention, the insert element can be produced particularly inexpensively owing in particular to the open design of the spiral port, which has a positive effect in terms of reducing the costs of producing the turbine and therefore the exhaust gas turbocharger as a whole.
In one advantageous embodiment of the second aspect of the invention, the spiral port is designed to be open at least in part in the axial direction of the exhaust gas turbocharger on one end face of the insert element pointing in the direction of an outlet of the turbine and/or the exhaust gas turbocharger comprises a bearing housing for bearing a rotor of the exhaust gas turbocharger, wherein the spiral port is designed to be open at least in part in the axial direction of the exhaust gas turbocharger on one end face of the insert element pointing in the direction of the bearing housing. Through the at least one spiral port, the insert element provides here for a particularly favorable guidance of the exhaust gas to a turbine wheel of the turbine of the exhaust gas turbocharger so that the whole exhaust gas turbocharger operates particularly efficiently. At the same time, the insert element is particularly inexpensive to produce.
The insert element of the second aspect of the invention is, for example, also designed as a turned part and/or as a milled part, i.e. by turning and/or milling, or by some other production process, in particular involving cutting, and/or as a component that can be produced through an investment casting process. The insert element of the second aspect of the invention can also be produced through a combination of the production processes described or through a combination of other production processes.
It is also possible for the insert element of both the first and the second aspect of the invention to be in the form of a sheet metal part comprising a number of pieces of sheet metal welded together and/or connected or joined in some other way.
In order to be able to cover the at least one spiral port or the numerous spiral ports and therefore be able to guide the exhaust gas to the turbine wheel in a favorable way, the insert element of the second aspect of the invention is located, for example, abutting a further component of the exhaust gas turbocharger. The insert element abuts the component, and the component covers the openly designed area of the spiral port, for example by means of a wall. The component is, for example, the turbine housing.
In order to avoid efficiency-reducing leakages, it is advantageous, by the application of force, to hold the insert element abutting, and therefore in contact with the component covering the open area of the spiral port. For this purpose, the insert element is for example supported indirectly on the bearing housing, as a result of which the insert element is held, by the application of force.
A spring element, in particular a disc spring, is advantageously provided, by means of which the insert element is supported on the bearing housing. The bearing housing can be supported here, at least in part, at least indirectly on the insert element or the component and/or in part on the turbine housing.
In a further embodiment of the invention, at least one lid element is provided, by means of which an area of the spiral port, in which the spiral port is designed to be open, is covered at least in part. Advantageously, the area of the spiral port that is designed to be open is completely covered by the lid element so that the exhaust gas can be guided to the turbine wheel in a particularly favorable way.
The lid element has the advantage that, in particular compared to the turbine housing and the insert element, it can have an uncomplicated and at least predominantly flat geometry in order to cover the spiral port in part. Owing to this uncomplicated geometry, in particular if the lid element is flat at least in part, the lid is distorted at least essentially uniformly during operation of the exhaust gas turbocharger under the stress of changing temperatures. As a result, efficiency-reducing leakages, where exhaust gas is able to flow out of the spiral port, are at least essentially avoided or the likelihood of such leakages is very small. It is advantageous if, by the application of force, the lid element is held at least indirectly on the insert element in order to cover the spiral port in a particularly tight manner. For this purpose, it is possible, for example, for the lid element to be supported, at least indirectly, on the one hand, on the insert element and, on the other hand, on the bearing housing. It is also possible to use at least one spring element by which the lid element is forced against the insert element and held particularly firmly on it.
A further embodiment keeping down the cost of producing the exhaust gas turbocharger of the second aspect of the invention is for the insert element to be separate from the turbine housing and to be inserted into the turbine housing in part during assembly of the exhaust gas turbocharger. This means that the turbocharger can be assembled quickly and inexpensively.
The third aspect of the invention relates to a turbine for an exhaust gas turbocharger, with a turbine housing having an accommodating space for accommodating a turbine wheel, which comprises at least one spiral port through which the exhaust gas flowing through the turbine can flow and which extends in the circumferential direction of the accommodating space over at least part of the circumference thereof, the spiral port having at least one inlet opening allowing exhaust gas to flow into the spiral port, wherein exhaust gas can be guided to the accommodating space via the spiral port.
According to the invention, at least one port part is provided, by means of which the at least one spiral port is divided into at least two spiral ports downstream of the inlet opening. Advantageous embodiments of the first two aspects are to be regarded as advantageous embodiments of the second aspect of the invention and vice versa. In other words, through the port part, at least two spiral part ports are formed which, during operation of the turbine, are supplied with exhaust gas via the spiral port common to the spiral part ports.
An exhaust gas stream flowing through the spiral port is divided by the spiral part ports into respective part streams so that the exhaust gas can flow particularly favorably towards the turbine wheel accommodated in the accommodating space and the latter can therefore be driven. This allows a particularly efficient and favorable operation of the turbine. This also keeps down production complexity and therefore the costs of producing the turbine and therefore the exhaust gas turbocharger as a whole.
The port part of the third aspect of the invention is, for example, designed as an insert element and therefore as an element that is separate from the turbine housing which is accommodated in the turbine housing. This allows particularly inexpensive manufacture of the port part and of the turbine as a whole. The port part is for example produced by machining and/or milling, or by some other manufacturing process, in particular involving cutting. It is also possible for the port part designed as an insert element to be produced using an investment casting process. As in the first two aspects of the invention, it is likewise possible for the port part designed as an insert element to be produced by a combination of production processes and/or the production processes described.
In a further embodiment of the third aspect of the invention, the port part is designed to be integral with the turbine housing. The port part is, for example, milled into the turbine housing here. To produce the turbine housing and the port part designed to be integral with the latter, provision can be made for a rough outline of the port part to be cast, for example through a sand casting process, and an exact final outline of the port part, in particular of the spiral part ports, to be shaped by means of mechanical processing, for example milling.
Like the insert elements of the first two aspects of the invention, the port part of the third aspect of the invention can also have a number of spiral ports, i.e. at least two, three or more, which, for example, are arranged in the circumferential direction of the port part over the circumference thereof behind one another or in the axial direction at the same height or in the circumferential direction at the same height and/or in the axial direction next to one another. The corresponding arrangement also has to be matched here to the conditions of use of the turbine of the third aspect of the invention and chosen accordingly.
In a further embodiment of the third aspect of the invention, at least one of the spiral part ports of the port part designed in particular as an insert element is designed to be open at least in part in the axial direction of the turbine on at least one end face of the port part. This means that the port part can be produced particularly inexpensively, in particular if the spiral part port is designed to be circumferentially completely open in the circumferential direction of the port part.
The area in which the spiral part port of the port part of the third aspect of the invention is designed to be open can, for example, be designed to be open in the direction of an outlet of the turbine or in the direction of a bearing housing of the exhaust gas turbocharger with the turbine of the third aspect of the invention.
It is likewise possible for the spiral part ports of the port part of the third aspect of the invention, in particular if the latter is designed as an insert element, to be circumferentially completely enclosed in the axial direction of the turbine on both end faces in the circumferential direction. This allows, on the one hand, the particularly favorable guiding of the exhaust gas to the accommodating space and, on the other, particularly quick and inexpensive assembly and therefore production of the turbine of the exhaust gas turbocharger since the port part designed in particular as an insert element can be incorporated easily and quickly at least in part into the turbine housing and arranged there.
The fourth aspect of the invention relates to an exhaust gas turbocharger having a turbine according to the third aspect of the invention, wherein in particular in the axial direction of the exhaust gas turbocharger or of the turbine, between a housing part, in particular a bearing housing, of the exhaust gas turbocharger and the port part, an interspace delimited from the port part at least in part, in particular in the axial direction at least in part, is formed which is connected in flow terms to the at least one spiral port. Advantageous embodiments of the first three aspects of the invention are to be regarded as advantageous embodiments of the fourth aspect of the invention and vice versa. This flow connection means that at least essentially equal pressure prevails in the spiral port and in the interspace. This pressure can then act, in particular at least essentially in the axial direction, on a wall of the port part, wherein the wall, on the one hand, delimits the interspace and, on the other, delimits at least one of the spiral part ports. On the spiral part port side, which is delimited by this wall, a lower pressure acts on the wall than on the interspace side since, in the individual spiral part ports, a pressure, in particular a static pressure, prevails which is lower than the pressure, in particular the static pressure, in the interspace or in the at least one spiral port.
As a result of this described pressure difference, force is applied to the port part acting in a corresponding, in particular at least essentially axial direction. This application of force can be used to force the port part designed in particular as an insert element against a further component of the exhaust gas turbocharger and to hold the port part, through the application of force, at least indirectly on the component.
If at least one of the spiral part ports on the at least one end face is designed to be open at least in part, then this application of force can be used to hold the port part on the corresponding component, wherein the component can then tightly cover that area of the spiral port designed to be open. As a result, efficiency-reducing leakages, where exhaust gas is able to flow out of the open spiral part port, are at least essentially avoided.
It is also possible, in the second and third aspects of the invention, for a corresponding interspace according to the fourth aspect of the invention to be provided between the insert element and a housing part of the turbine or of the exhaust gas turbocharger, wherein the interspace is connected in flow terms to a further spiral port, in particular a feed port, so that a higher pressure prevails in the interspace than in the at least one spiral port formed by the insert element. Then, the insert element can, in a way described in relation to the fourth aspect of the invention, be held similarly through the application of force on a component, for example the lid element, or a housing part, for example the turbine housing, in order to cover at least essentially tightly that area of the spiral port formed by the insert element that is designed to be open.
The fifth aspect of the invention relates to a turbine for an exhaust gas turbocharger, with a turbine housing which has at least one spiral port and an accommodating space in which a turbine wheel is to be accommodated such that it can rotate. The turbine wheel can be acted upon with exhaust gas via the spiral port, wherein the turbine comprises an actuating device by means of which a spiral inlet cross section and/or a nozzle cross section of the at least one spiral port can be adjusted to the accommodating space.
According to the invention, in the fifth aspect of the invention, provision is made for the actuating device to have at least two intermeshing tooth systems for the purposes of adjusting the spiral inlet cross section and/or the nozzle cross section. Advantageous embodiments of the first four aspects of the invention are to be regarded as advantageous embodiments of the fifth aspect of the invention and vice versa. The adjustment of the spiral inlet cross section and/or of the nozzle cross section via the tooth systems allows a particularly large adjustment range, in particular adjustment angle range, in which the spiral inlet cross section and/or the nozzle cross section can be variably adjusted. This allows a particularly high through-put spread of the variable turbine of the fifth aspect of the invention, as a result of which the turbine can be adapted particularly efficiently to a number of operating points of an internal combustion engine assigned to the exhaust gas turbocharger. This results in a particularly efficient operation of the turbine in the at least virtually entire characteristic map of the internal combustion engine, so that the latter can be operated particularly efficiently and with a low fuel requirement and low CO2 emissions.
Owing in particular to its adjustability via the tooth systems which are advantageously arranged in the turbine housing, the turbine also has only a small space requirement, which helps to solve or to avoid packaging problems, in particular in an area such as an engine bay where space is critical.
In order to adjust the spiral cross section and/or the nozzle cross section, the actuating device comprises at least one assigned blocking element in the spiral port, for example a tongue which can be moved in the circumferential direction of the accommodating space or of the turbine wheel.
A further advantage of the tooth system is that a harmonic transmission between an adjustment member for moving the blocking unit and the blocking unit itself can be achieved over the adjustment range.
The adjustment unit is arranged, for example, on an adjustment ring which is arranged in the turbine housing such that it can be rotated about a rotational axis via the tooth systems and the adjustment member. If the ring is turned, then the blocking element also moves so that the spiral inlet cross section and/or the nozzle cross section are variably adjusted, i.e. can be made larger or smaller.
In one advantageous embodiment of the invention, provision is made for one of the tooth systems to be provided on the adjustment ring of the actuating device and for the other tooth system to be connected in a rotationally fixed manner to an adjustment shaft of the actuating device that can be rotated about a rotational axis. The adjustment ring is connected to the adjustment member here via the adjustment shaft. The adjustment member is for example, an electric motor with an output shaft which can be rotated about a rotational axis in order to move the blocking unit. The adjustment shaft is connected here to the output shaft or formed by the output shaft so that turning the output shaft of the electric motor causes the adjustment shaft to turn and therefore the blocking unit to move.
Further advantages, features and details of the invention will become more readily apparent from the following description of preferred exemplary embodiments with reference to the accompanying drawings.
In the figures, the same reference numerals refer to at least functionally identical elements, components and/or the like.
The exhaust gas turbocharger 10 also comprises a compressor not shown in
By the turbine housing 14, a spiral port 28 is formed in part which serves as a feed port. In the spiral port 28, exhaust gas can flow into an internal combustion engine assigned to the exhaust gas turbocharger 10 in the direction of an arrow 32 via an inlet opening 30 of the spiral port 28. The exhaust gas then flows through the spiral port 28 in the direction of an arrow 34.
A multi-segment insert 36 shown in perspective and schematic view in
As can be seen in
For this purpose, the spiral ports 38, 40, 42 and 44 have respective outlet openings 50, 51, 52 and 53 via which the spiral ports 38, 40, 42 and 44 open into the accommodating space 18 and via which the exhaust gas can flow to the turbine wheel 20 at least essentially in the radial direction of the turbine wheel 20 and of the multi-segment insert 36 in the direction of an arrow 54. The turbine 12 is therefore a radial turbine.
The exhaust gas turbocharger 10 also comprises an actuating device 56 with respective tongues 58, 60, 62 and 64 assigned to the spiral ports 38, 40, 42 and 44 or to the corresponding outlet openings 50, 51, 52 and 53. The tongues 58, 60,'62 and 64 are connected to an adjustment ring 66 which can be rotated about the rotational axis 26. Turning the adjustment ring 66, which also is referred to as a tongue diverter, produces an adjustment, in particular a displacement, of the tongues 58, 60, 62 and 64 in the circumferential direction as shown by the arrow 48. By this movement or displacement of the tongues 58, 60, 62 and 64, a spiral inlet cross section AS of the spiral ports 38, 40, 42 and 44 (wherein the overview in
In the multi-segment insert 36 of the exhaust gas turbocharger 10 according to
The multi-segment insert 36 can for example be formed as an integral component by an investment casting process. It is likewise possible for the multi-segment insert 36 to be designed as a sheet metal part comprising a number of pieces of sheet metal which, for example, form the walls 68, 70 and 72 and which are welded together.
By the four spiral ports 38, 40, 42 and 44, four segments are formed through which exhaust gas can flow and via which the exhaust gas can be guided towards the turbine wheel 20. Of course the multi-segment insert 36 can also have more or fewer spiral ports or segments.
As shown in
If the multi-segment insert 36I allows particularly easy and inexpensive assembly and production of the exhaust gas turbocharger 10 and particularly efficient operation thereof, then the multi-segment insert 36I itself is particularly inexpensive to produce owing to the open design of the spiral ports 38, 40, 42 and 44. The multi-segment insert 36I is produced, for example, as a turned part and/or as a milled part, by an investment casting process or by a combination of production processes, in particular the production processes described.
In order to avoid efficiency-reducing leakages and therefore an overflowing of exhaust gas from one of the spiral ports 38, 40, 42 and 44 into another of the spiral ports 38, 40, 42 and 44, the multi-segment insert 36I is held on its open end face 82 against the turbine housing 14 by means of the bearing housing 16 so that the turbine housing 14 completely and tightly covers the spiral ports 38, 40, 42 and 44 of the multi-segment insert 36I with a corresponding area of a wall 86 of the turbine housing 14.
In order to hold the multi-segment insert 36I in the turbine housing 14 in an axial direction as shown by the arrow 49 and force it against the turbine housing 14, the multi-segment insert 36I is supported via a disc spring 75 on the bearing housing 16. The bearing housing 16 is supported here in part not only via the disc spring 75 on the multi-segment insert 36I, but also in part on the turbine housing 14. This means that the multi-segment insert 36I is forced, under the application of spring force, by the disc spring 75 particularly firmly against the turbine housing 14 in the direction of the arrow 80 and held on the latter so that leakages are at least essentially avoided. As a result, the multi-segment insert 36I is pressed into the turbine housing 14.
Otherwise, the description given in relation to the exhaust gas turbocharger 10 and the multi-segment insert 36 relating to
In order to cover the spiral ports 38, 40, 42 and 44 of the multi-segment insert 36II completely and at least essentially not also towards the end face 84, the exhaust gas turbocharger 10II comprises a lid 86 which is likewise arranged in the turbine housing 14. The lid 86 has a flat wall 89 by means of which the spiral ports 38, 40, 42 and 44 are circumferentially completely covered in the circumferential direction. For this purpose, the lid 86 is supported on the multi-segment insert 36II via respective contact surfaces 74II and abuts against the multi-segment insert 36II. The multi-segment insert 36II and the lid 86 are held in the axial direction by the bearing housing 16 which abuts via respective contact surfaces 74I against the lid 86. In other words, the bearing housing 16, by means of the lid 86, abuts against the multi-segment insert 36II which in turn abuts via the contact surfaces 76 against the turbine housing 14 and is supported thereon. Through this support chain, the lid 86 is forced by means of the bearing housing 16 on the multi-segment insert 36II in the direction of the arrow 80, as a result of which leakages between the spiral ports 38, 40, 42 and 44 of the multi-segment insert 36II are at least essentially avoided. As a result, the multi-segment insert 36II is likewise pressed via the lid 86 and the lid 86 into the turbine housing 14. As in the case of the exhaust gas turbochargers 10 and 10I according to the preceding
In order to cover tightly the spiral ports 38, 40, 42 and 44 of the port part 37, the lid 86 is provided which is forced by means of the bearing housing 16 in the axial direction as shown by the arrow 80 against the turbine housing 14, is therefore held thereon and is supported via contact surfaces 74II on the latter. As a result, the lid 86 is pressed into the turbine housing 14.
In order to produce the port part 37 which is geometrically as sophisticated as the multi-segment inserts 36, 36I and 36II, the port part 37 is, for example, milled into the turbine housing 14, wherein the spiral-shaped walls 68 which delimit the spiral ports 38, 40, 42 and 44 in a radial direction as shown by the arrow 54, are formed.
In the production of the turbine housing 14, for example by a sand casting process, a rough shape of the port part 37 can be formed first. The final outline of the port part 37 shown in
The multi-segment insert 36III is, for example, the multi-segment insert 36 of the exhaust gas turbocharger 10 according to
As can be seen in
It is likewise possible for the disc spring 75 to be used, for example, in the exhaust gas turbochargers 10, 10II and 10III and to be arranged in the axial direction between the bearing housing 16 and the lid 86 and/or between the lid 86 and the corresponding multi-segment insert 36, 36II or the port part 37 in order to avoid corresponding leakages.
Possible leakage paths are also indicated in
The disc spring 75 has the advantage here that, even in the event of thermal expansion of the assembly of the turbine housing 14, the multi-segment insert 36, 36I, 36II, 36III, 36IV, the bearing housing 16 and, if applicable, the lid 86, it acts at least virtually always on the multi-segment insert 36, 36I, 36II, 36III, 36IV at least indirectly with the desired considerable force in order to cover tightly the spiral ports 38, 40, 42 and 44, for example through the turbine housing 14 and/or the lid 86.
In the exhaust gas turbocharger 10VI, the interspace 92 is connected in flow terms to the spiral port 28 functioning as a feed port. For this purpose, for example, a number of through-openings 96, provided here in the form of bores, of which one through-opening 96 is shown in
As a result, the multi-segment insert 36V is forced via the contact surfaces 76 against the turbine housing 14 of the turbine 12 and pressed into the latter so that the spiral ports 38, 40, 42 and 44 are at least essentially covered by the turbine housing 14. In a similar way, the force F can also be applied to the lid 86 in order to cover the spiral ports 38, 40, 42 and 44 at least essentially tightly. This is a particularly advantageous method of at least essentially preventing any leakages, for example the leakage paths indicated by the arrows 88 and 90.
The actuating device 56 comprises, in addition to the adjustment ring 66 and the tongues 58, 60, 62 and 64, an adjustment wheel 98, an adjustment shaft 100 and an adjustment lever 102. The adjustment ring 66 and the adjustment wheel 98 are each provided with a tooth system 104 and 106, these being arranged within the turbine housing 14 of the turbine 12 of the exhaust gas turbocharger 10VII and meshing with one another. The adjustment wheel 98 is connected in a rotationally fixed manner to the adjustment shaft 100, which is held in the bearing housing 16 such that it can rotate about a rotational axis 108. The adjustment shaft 100 is also connected in a rotationally fixed manner to the adjustment lever 102 which is in part arranged in the turbine housing 14 and guided out of the bearing housing 16 via a through-opening. The adjustment lever interacts with an actuator of the exhaust gas turbocharger 10VII, this being, for example, a vacuum cell, an electric motor, some other adjustment member or the like. The actuator can move, in particular turn, the adjustment lever 102 in the direction of an arrow 110, as a result of which the adjustment shaft 100 is turned about the rotational axis 108 in the direction of an arrow 112. This in turn rotates the adjustment wheel 98 about the rotational axis 108, which involves a rotation of the adjustment ring 66 about the rotational axis 24 in the direction of an arrow 114 via the tooth systems 104 and 106. Through this rotation of the adjustment ring 66, the tongues 58, 60, 62 and 64 are displaced in the direction of the arrow 48 as described at the beginning, as a result of which the spiral inlet cross section AS and/or the nozzle cross section AR is or are adjusted. This adjustment via the tooth systems 104 and 106 has the advantages that particularly high throughput spreads of the variable turbine 12 of the exhaust gas turbocharger 10VII can be achieved. Of course the adjustment of the adjustment ring 66 in the way described in respect of
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2010 051 359.8 | Nov 2010 | DE | national |
This is a Continuation-In-Part application of pending international patent application PCT/EP201100530 filed Oct. 21, 2011 and claiming the priority of German patent application 10 2010 051 359.8 filed Nov. 13, 2010.
| Number | Date | Country | |
|---|---|---|---|
| Parent | PCT/EP2011/005309 | Oct 2011 | US |
| Child | 13893278 | US |
