Turbine housing with a reduced stress connecting flange and exhaust gas turbine comprising such a turbine housing

Abstract

The invention relates to a turbine casing for an exhaust-gas turbine, which turbine casing has a connection flange for bearing-casing-side attachment to a bearing casing in which casing-connection holes that are mutually spaced in the circumferential direction are provided, wherein, between adjacent casing-connection holes, material recesses that are open radially inwards towards a central longitudinal axis of the turbine casing are provided in the connection flange. The invention further relates to an exhaust-gas turbine which is equipped with such a turbine casing.

Description

Technical field of the invention

[0001] The invention relates to a turbine housing with a low-stress connecting flange and an exhaust gas turbine with such a turbine housing. Depending on the embodiment, the exhaust gas turbine can, for example, be a turbocharger turbine for a turbocharger or a utility turbine. State of the art

[0002] A one-piece exhaust system for a gas turbine is known from US patent 2015 / 0143814 A1. This exhaust system comprises a turbine outlet casing and a turbine exhaust manifold, with the turbine outlet casing being connected to the turbine exhaust manifold via outward-facing interface flanges. This allows the turbine exhaust manifold to be easily detached from the turbine outlet casing and replaced with a new component if necessary.

[0003] From EP 3 103 972 A1 a gas turbine is known in which a high-pressure turbine casing is connected to a diffuser casing at outwardly facing flanges.

[0004] From EP 1 273 760 A1 a turbocharger is known in which sealing agents are arranged between a turbine inlet spiral and a turbine nozzle ring defining a circular passage.

[0005] A typical turbocharger has a turbine housing, a bearing housing and a compressor housing, with the turbine housing being connected to the bearing housing and the bearing housing further connected to the compressor housing.

[0006] The connection between the turbine housing and the bearing housing must meet several requirements. These include ensuring gas tightness, preventing twisting between the two housings due to external forces, and guaranteeing the cohesion of the two housings even in the event of a burst. To meet these requirements, the connection between the turbine housing and the bearing housing must be designed to withstand large temperature differences between the two housings and high forces in a burst. A reliable safety containment – ​​also known as "containment" – is a crucial and therefore highly demanding design requirement for an exhaust gas turbine in such a burst scenario.

[0007] It is already known to connect a turbine housing to a bearing housing using a clamping ring that connects an end section of a flange on the turbine housing to an end section of a flange on the bearing housing that abuts the end section of the flange on the turbine housing. Such a clamping ring connection is used particularly in turbochargers with comparatively low power outputs. A disadvantage of such a clamping ring connection is that it cannot guarantee the cohesion of the housings in the event of a burst, where high forces are exerted.

[0008] For turbochargers with higher power outputs, for example, those with more than 500 kW of engine power per turbocharger, a connection between the turbine housing and the bearing housing using a flange equipped with clamping lugs has become standard practice. These clamping lugs accommodate screws, which are threaded into holes in the turbine housing and press the clamping lugs against the turbine housing and the adjacent bearing housing, thereby also pressing the bearing housing against the turbine housing. When using such a clamping lug flange, a relatively large penetration depth of the screws into the turbine housing is required due to the high forces involved in a bursting event. To provide this large penetration depth, the thickness of the connecting flange of the turbine housing must be correspondingly large.This large thickness of the connecting flange increases its stiffness, but also results in a comparatively slow and uneven heating of the turbine housing's connecting flange. This increases the thermally transient stresses in the turbine housing, particularly in the area of ​​the connecting flange, but also in the area of ​​the turbine housing tongue. These higher thermally transient stresses, in turn, lead to a reduced service life of the turbine housing and thus of the entire turbocharger.

[0009] The Figure 1Figure 1 shows a first sectional view illustrating a turbine housing according to the prior art. This turbine housing has a connecting flange 2, via which the turbine housing 1 is connected to the bearing housing 14 of a turbocharger. This connection is realized using connecting elements screwed into housing connection bores of the connecting flange, which, by means of nuts 17, press clamping tabs 16 onto the connecting flange 2 of the turbine housing 1 and onto the bearing housing 14, thereby further pressing the bearing housing 14 against the turbine housing. The aforementioned housing connection bores are spaced apart from each other (i.e., spatially separated) and are arranged circumferentially along a circle. The clamping tabs are also arranged circumferentially along a circle of the turbine housing.Since – as explained above – the requirements for the connection between the turbine housing and the bearing housing are high, the penetration depth of the connecting elements into the connecting flange must be large. This, in turn, requires a comparatively large flange thickness 19 of the connecting flange 2 in the area of ​​the connection between the turbine housing and the bearing housing.

[0010] The Figure 2 Figure 1 shows a second sectional view illustrating a turbine housing according to the prior art. This second sectional view illustrates the turbine housing at an interface where a connecting element 15 is screwed into a housing connection bore 3 of the connecting flange 2 of the turbine housing. Also from the Figure 2 It can be seen that a clamping tab 16 is pressed onto both the turbine housing 2 and the bearing housing 14, which is achieved using a nut 17 and a washer 18. Object of the invention

[0011] The object of the invention is to provide a turbine housing and an exhaust gas turbine in which the disadvantages mentioned above with reference to a turbocharger are reduced. Brief description of the invention

[0012] This problem is solved by a turbine housing with the features specified in claim 1 or by an exhaust gas turbine with the features specified in claim 11.

[0013] Such a turbine housing for an exhaust gas turbine has a connecting flange for connection to a bearing housing on the bearing housing side, in which housing connection bores spaced apart from one another in the circumferential direction are provided, wherein material recesses are provided in the connecting flange between adjacent housing connection bores, opening radially inwards in the direction of a longitudinal center axis of the turbine housing, wherein the connecting flange is a bearing housing-side side wall of the turbine housing, wherein the connecting flange has a clamping edge and an annular recess, wherein the annular recess is provided in a radially inner edge region of the clamping edge, wherein the annular recess extends circumferentially over the entire circumference of the turbine housing and has a recess bottom, and wherein the material recesses are provided in the recess bottom of the annular recess.Depending on the design and requirements, the turbine housing can also consist of multiple parts. Depending on the requirements, a heat shield or a nozzle ring can be arranged between the turbine housing and the bearing housing.

[0014] In any case, the term "bore" in this entire description is to be interpreted functionally and not as referring to a mechanical processing using a drilling machine or milling machine.

[0015] According to one embodiment of the invention, the spaced-apart housing connection bores are arranged in the connecting flange along at least one circle.

[0016] According to one embodiment of the invention, the turbine housing has a clamping edge which is arranged adjacent to the housing connection bores in the radial direction.

[0017] According to one embodiment of the invention, an annular recess is provided in the clamping edge, which has a recess bottom, wherein the adjacent housing connection bores are provided in the recess bottom and wherein the material recesses provided between each two adjacent housing connection bores are provided in the recess bottom.

[0018] According to one embodiment of the invention, the clamping edge in the area between two adjacent housing connection bores has a clamping edge recess that widens the annular recess.

[0019] According to one embodiment of the invention, the depth of the clamping edge recess corresponds to the sum of the depth of the annular recess and the depth of the material recesses provided in the annular recess.

[0020] According to one embodiment of the invention, the turbine housing is designed in multiple parts.

[0021] According to one embodiment of the invention, the clamping edge forms a separate part of the turbine housing.

[0022] According to one embodiment of the invention, a heat shield or a nozzle ring forms a separate part of the turbine housing.

[0023] According to one embodiment of the invention, the clamping edge is part of the heat shield or the nozzle ring.

[0024] According to one embodiment of the invention, an exhaust gas turbine has a turbine housing with the features according to the invention.

[0025] According to one embodiment of the invention, an exhaust gas turbine has a bearing housing connected to the turbine housing, wherein the turbine housing is connected to the bearing housing by means of connecting elements.

[0026] According to one embodiment of the invention, an exhaust gas turbine has clamping elements which are each pressed onto the connecting flange of the turbine housing and onto the bearing housing by one or more connecting elements.

[0027] According to one embodiment of the invention, the clamping elements of the exhaust turbine are pressed against the clamping edge.

[0028] In a design that is simple in terms of both construction and assembly, the connecting elements are screws or threaded studs.

[0029] The advantages of the invention lie particularly in the fact that the material recesses provided between the housing connection bores enable faster and more uniform heating of the connection flange area during operation of the respective exhaust gas turbine. Furthermore, these material recesses result in reduced stiffness of the turbine housing in the area of ​​the connection flange. This leads to lower thermal transient stresses during operation of the exhaust gas turbine. This, in turn, extends the service life of the turbine housing and thus also the service life of the entire exhaust gas turbine. Brief description of the drawings

[0030] It shows: Figure 1 is a first sectional view illustrating a turbine housing according to the prior art; Figure 2 is a second sectional view illustrating a turbine housing according to the prior art; Figure 3 is a sketch illustrating a turbine housing according to the invention; Figure 4 is a radial sectional view illustrating an embodiment of the invention; Figure 5 is a sectional view according to the one shown in the Figure 4 Section line CC shown, Figure 6 a sketch to illustrate another embodiment of the invention, Figure 7 a sectional view in the direction of the Figure 6 Section line AA shown, Figure 8 a sketch to illustrate a further embodiment of the invention and Figure 9 a sectional view in the direction of the Figure 8 shown section line B - B. Detailed description of implementation examples

[0031] The Figure 3Figure 1 shows a sketch illustrating a turbine housing according to the invention, wherein in the Figure 3Only a portion of this turbine housing is shown. The turbine housing has a connecting flange 2 arranged coaxially to a longitudinal center axis of the turbine housing, which is equipped with a clamping edge 7. Connecting webs 19 extending radially inwards in the direction 8 are provided in this clamping edge 7, into which housing connection bores 3 are provided. The aforementioned connecting webs 19, and thus also the housing connection bores 3 provided in them, are spaced apart from one another in the circumferential direction 9 of the turbine housing. They are arranged in the connecting flange along one or more circles in the circumferential direction 9. Between each pair of housing connection bores 3 spaced apart in the circumferential direction 9, radially inwardly opening material recesses 4 are provided in the clamping edge 7 of the connecting flange 2.These material recesses 4 can be created by removing material from the clamping edge of the connecting flange or, when using a forming manufacturing process, can be directly modeled. The geometry of the material recesses can vary. For example, the material recesses can be semicircular, elliptical, bell-shaped, or rectangular.

[0032] A connection of the turbine housing with one in the Figure 3 The bearing housing of a turbocharger, not shown, is replaced in the same way as described above in connection with the Figure 2The following was explained: using connecting elements which are inserted into a housing connection bore 3 of the connecting flange 2, wherein furthermore clamping elements arranged in the circumferential direction of the turbine housing along a circle, which in one embodiment are clamping tabs, are pressed onto both the turbine housing and the bearing housing, which is realized in each case using a nut and a washer.

[0033] The material recesses 4, which differ from the prior art, result in faster and more uniform heating of the turbine housing's connecting flange 2 during turbocharger operation. Furthermore, the material recesses 4 incorporated into the connecting flange 2 reduce the turbine housing's stiffness in the area of ​​the connecting flange 2. This, in turn, leads to reduced thermal transient stresses in the area of ​​the connecting flange 2 compared to the prior art. This reduction in thermal transient stresses in the area of ​​the connecting flange extends the service life of the turbine housing and thus also the service life of the entire turbocharger.

[0034] The Figure 4Figure 1 shows a sectional view in the radial direction to illustrate an embodiment of the invention. Shown are the connecting flange 2 of the turbine housing and the bearing housing 14 connected to the connecting flange 2 and thus to the turbine housing. Furthermore, the following can be seen from the Figure 4 It is evident that in the depicted section plane, the connection between the turbine housing and the bearing housing is realized using a clamping tab 16. This clamping tab 16 is pressed onto the connecting flange 2 of the turbine housing and onto the bearing housing 14. This pressing action is achieved using a nut 17 and a washer 18 arranged between the nut 17 and the clamping tab 16. Furthermore, it is evident from the Figure 4 This shows that this pressure presses the bearing housing against the connecting flange 2 of the turbine housing, since the bearing housing 14 has a radial outward thrust, i.e. in the Figure 4has an upward-facing clamping edge, the back of which faces radially inwards, i.e. in the Figure 4 downwards, the extension of the connecting flange 2 is pressed. Finally, the Figure 4 also one of the in Figure 3 The illustrated recesses 4 show that, in the connected state of the turbine housing with the bearing housing, they are provided in the section plane shown in the axial direction between the clamping tab 16 and the connecting flange 2.

[0035] The Figure 5 shows a sectional view according to the one in the Figure 4Section line CC shown. From this illustration it is particularly evident that between each pair of housing connection bores 3 spaced apart in the circumferential direction 9, into which connecting elements 15 are inserted, material recesses 4 are provided in the clamping edge 7 of the connecting flange 2 of the turbine housing, which are located in the section plane shown in the radial direction 8 outside the bearing housing 14 and are open radially inwards.

[0036] The Figure 6 Figure 1 shows a sketch illustrating another embodiment of the invention. In this other embodiment, an annular recess 5 is provided in the radially inner edge region of the clamping edge 7 of the connecting flange 2 of the turbine housing, extending in the circumferential direction 9 over the entire circumference of the turbine housing. This annular recess 5 has a recess base 6.

[0037] In this embodiment of the invention, the housing connection bores 3, spaced apart from each other in the circumferential direction 9, are inserted into the base 6 of the annular recess 5.

[0038] Furthermore, in this embodiment, the material recesses 4 provided between each pair of adjacent housing connection bores 3 are also incorporated into the base 6 of the annular recess 5. These material recesses 4 extend radially 8 across the entire base 6 of the recess.

[0039] By introducing the housing connection bores 3 and the material recesses 4 into the recess bottom 6 of the annular recess 5, the thickness of the connecting flange 2 of the turbine housing in the connection area of ​​the turbine housing with the bearing housing and thus the thermally transient stresses occurring in the connecting flange 2 during operation of the turbocharger are further reduced.

[0040] The Figure 7 shows a cross-sectional view in the direction of the Figure 6 shown section line A - A. In this Figure 7 The depth of the housing connection bores 3 in the recess base 6 is designated by the reference numeral 12. Furthermore, it is evident that in this embodiment, the depth of the material recesses 4 corresponds to the depth 12 of the housing connection bores 3 in the recess base 6. According to other embodiments, the depth of the material recesses 4 may also differ from the depth of the housing connection bores 3. The depth of the annular recess 5 is designated by the reference numeral 11. The sum of the depth 11 of the annular recess and the depth 12 of the housing connection bores in the recess base is designated by the reference numeral 20.

[0041] The Figure 8Figure 1 shows a sketch illustrating a further embodiment of the invention. In this further embodiment, an annular recess 5 is again provided in the radially inner edge region of the clamping edge 7 of the connecting flange 2 of the turbine housing, extending circumferentially 9 over the entire circumference of the turbine housing. Housing connection bores 3, spaced apart from one another circumferentially 9, are again provided in the base 6 of the annular recess 5, between which the material recesses 4 are located. These recesses 4 are open radially 8 inwards and extend into the region of the clamping edge 7. Consequently, in this further development, the clamping edge 7 has clamping edge recesses 10, each provided between two adjacent housing connection bores 3.In the illustrated embodiment, these clamping edge recesses 10 extend in radial direction 8 through the entire clamping edge 7.

[0042] The Figure 9 shows a cross-sectional view in the direction of the Figure 8 shown section line B - B. According to this Figure 9 The clamping edge recess 10 provided in the clamping edge 7 has a first depth 20. The annular recess 5 has a second depth 11. The housing connection bores 3 provided in the recess bottom 6 have a third depth 12. In the illustrated embodiment, the first depth 20 of the clamping edge recess 10 corresponds to the sum of the second depth 11 of the annular recess 5 and the third depth 12 of the housing connection bore 3 provided in the annular recess 5. The depths 20, 11, and 12 each extend in the axial direction 13 of the turbine housing.

[0043] The following describes preferred general aspects of the invention, wherein the reference numerals refer to all the aforementioned embodiments, but the statements made are not limited to any single embodiment, but can rather be combined with any embodiments and aspects.

[0044] According to one aspect, the flange thickness 19 of the connecting flange 2 is reduced due to the recesses 4 and 10, respectively, which are incorporated into the connecting flange 2 in addition to the housing connection bores 3. This reduces the thermally transient stresses occurring in the connecting flange 2 compared to the prior art, leading to an extended service life of the turbine housing and thus of the entire turbocharger. This turbocharger has a turbine housing as described above.

[0045] According to another aspect, this turbocharger has a bearing housing connected to the turbine housing, wherein the turbine housing is connected to the bearing housing by means of connecting elements 15 inserted into the housing connection bores 3 of the turbine housing, which are, for example, screws or threaded studs.

[0046] According to another aspect, the turbocharger features clamping elements implemented as clamping tabs 16, each of which is pressed against the connecting flange 2 of the turbine housing and against the bearing housing 14 by one or more connecting elements. The clamping elements are pressed against a clamping edge of the connecting flange. Instead of clamping tabs, clamping discs or clamping rings, for example, can also be used. The clamping elements are preferably designed to be at least slightly elastic so that they can yield at least slightly when the nuts are tightened.

[0047] According to a further aspect, the spaced-apart housing connection bores 3 in the connection flange 2 are arranged circumferentially along at least one circle, preferably at most three or at most two (concentric to each other and / or to the turbine axis), and extend along the entire circumference of the at least one circle, preferably distributed at regular intervals. The number of required housing connection bores depends on the strength requirements in the event of damage (containment) and the sealing requirements.

[0048] According to another aspect, the spaced-apart housing connection bores 3 in the connection flange 2 can also be arranged circumferentially along two or more circles, wherein, for example, every second housing connection bore 3 is arranged along a first circle and every intermediate housing connection bore 3 is arranged along a second circle.

[0049] According to one aspect, the flange has at least five housing connection bores 3 and / or at least two, preferably at least four, particularly preferably at least five material recesses 4 between adjacent housing connection bores 3.

[0050] According to a further aspect, material recesses 4 are provided between all housing connection bores. The material recesses 4 are open radially inwards. The material recesses 4 are preferably closed in the axial direction by a (e.g., annular) rear side of the connecting flange, i.e., they are not continuous in the axial direction.

[0051] Alternatively, material recesses 4 can be provided not between all housing connection bores 3, but only where the influence on the service life is relevant, for example in the area of ​​the entry into the spiral.

[0052] According to one aspect, the flange is arranged coaxially to the longitudinal center axis of the turbine housing.

[0053] According to another aspect, the flange is aligned towards a bearing housing of the exhaust turbine or arranged for the connection of the turbine housing with the bearing housing (optionally with part of a heat shield and / or a diffuser ring between the flange and the corresponding part of the bearing housing).

[0054] According to one aspect, the recess 4 has an arc length in the circumferential direction of more than half the distance between the centers of the two housing connection bores 3.

[0055] According to one aspect, the connecting flange 2 has connecting webs 19 which directly surround the housing connecting bores 3 at least partially and which are arranged in the circumferential direction between the adjacent housing connecting bores 3 and the intermediate material recess 4.

[0056] According to one aspect, the connecting flange 2 has a clamping edge 7 which is arranged adjacent to the housing connecting bores 3 in radial direction 8.

[0057] According to one aspect, the connecting webs 19 extend radially inwards from the clamping edge 7. The clamping edge can be provided as a separate part of the turbine housing or integrally with the rest of the turbine housing or connecting flange.

[0058] From one perspective, the turbine housing can be multi-part. In this case, a heat shield or nozzle ring can form a separate part of the turbine housing. The clamping edge of the turbine housing can then be part of the heat shield or nozzle ring, i.e., integrated into the heat shield or nozzle ring.

[0059] According to one aspect, the connecting webs are recessed axially relative to the clamping edge 7. In other words, the clamping edge protrudes axially beyond the connecting webs (e.g., by less than 1 mm or even by a maximum of 0.5 mm and / or by more than 0.1 mm) (e.g., away from the turbine housing or towards the bearing housing of the exhaust turbine). Thus, the connecting webs form part of a recessed base. According to another aspect, the material recesses 4 provided between each pair of adjacent housing connection bores are recessed even further axially relative to the connecting webs.

[0060] According to one aspect, the clamping edge can run continuously (without interruption) in the circumferential direction or have recesses.

[0061] According to one aspect, the connecting flange 2 has an annular recess 5 which has a recess bottom 6.

[0062] According to one aspect, the adjacent housing connection bores 3 are inserted into the bottom of the recess.

[0063] According to one aspect, the material recesses 4 provided between each pair of adjacent housing connection bores are provided in the base of the recess.

[0064] As can be seen from the foregoing, a preferred aspect of the present invention relates to a turbine housing for an exhaust gas turbine, which has a connecting flange for connecting the turbine housing to a bearing housing of the exhaust gas turbine on the bearing housing side. This connecting flange is preferably a bearing housing-side side wall of the turbine housing. The side wall of the turbine housing is preferably designed to form a direct connection with a turbine-side side wall of the bearing housing, or is directly connected to the turbine-side side wall of the bearing housing. The side wall of the turbine housing is preferably designed to form a connection with a turbine-side side wall of the bearing housing by means of a common connecting element (penetrating into the housing connection bores of the turbine housing), e.g., a connecting screw.The turbine housing is connected to the turbine-side side wall of the bearing housing by means of such a common connecting element. According to a preferred aspect, no radially outwardly directed connecting flanges are present at the connection point, and / or such connecting flanges are not required to connect the turbine housing to the bearing housing. Reference symbol list

[0065] 1 Turbine housing 2 Connecting flange 3 Housing connecting bore 4 Material recess 5 Annular recess in connecting flange 6 Recess bottom 7 Clamping edge of the connecting flange 8 Radial direction 9 Circumferential direction 10 Clamping edge recess 11 Depth of the annular recess 5 12 Depth of the housing connecting bores 3 13 Axial direction; direction of the longitudinal center axis of the turbine housing 14 Bearing housing 15 Connecting element 16 Clamping element 17 Nut 18 Washer 19 Connecting web 20 Sum of the depth of the annular recess 5 and the depth of the housing connecting bores 3 21 Longitudinal center axis of the turbine housing

Claims

1. Turbine casing (1) for an exhaust-gas turbine, which turbine casing has a connection flange (2) for bearing-casing-side attachment to a bearing casing, in which casing-connection bores (3) that are mutually spaced in the circumferential direction (9) are provided, wherein, between mutually adjacent casing-connection bores, material recesses (4) that are open radially inwards towards a central longitudinal axis of the turbine casing are provided in the connection flange, wherein the connection flange is a bearing-casing-side side wall of the turbine casing, characterized in that the connection flange has a clamping edge (7) and an annular depression (5), wherein the annular depression is provided in a radially inner edge region of the clamping edge (7), wherein the annular depression (5) extends in the circumferential direction (9) over the entire circumference of the turbine casing and has a depression bottom (6), and wherein the material recesses (4) are introduced into the depression bottom (6) of the annular depression (5).

2. Turbine casing according to Claim 1, in which the mutually spaced casing-connection bores (3) in the connection flange (2) are arranged in the circumferential direction (9) along at least one circle.

3. Turbine casing according to Claim 2, in which the clamping edge (7) is arranged adjacent to the casing-connection bores (3) in the radial direction (8).

4. Turbine casing according to Claim 3, in which the adjacent casing-connection bores (3) are surrounded, at least in some section or sections, by connection webs (19) arranged in a manner recessed in the axial direction (13) of the turbine casing with respect to the clamping edge (7), wherein the material recesses (4) provided between in each case two adjacent casing-connection bores are arranged in a manner recessed in the axial direction (13) of the turbine casing with respect to the connection webs (19).

5. Turbine casing according to Claim 4, in which the clamping edge (7) has, in the region between two adjacent casing-connection bores (3), a respective clamping edge recess (10) that widens an annular depression (5).

6. Turbine casing according to Claim 5, in which a first depth (20) of the clamping edge recess (10) coincides with the sum of a second depth (11) of the annular depression (5) and a third depth (12) of the casing-connection bores (3) provided in the annular depression, wherein these depths extend in the axial direction (13) of the turbine casing.

7. Turbine casing according to any of the preceding claims, wherein the turbine casing is of multi-piece design.

8. Turbine casing according to Claim 7, in which the clamping edge (7) forms a separate component of the turbine casing.

9. Turbine casing according to Claim 7, in which a heat shield or a nozzle ring forms a separate component of the turbine casing.

10. Turbine casing according to Claim 9, in which the clamping edge (7) is part of the heat shield or of the nozzle ring.

11. Exhaust-gas turbine (15) which has a turbine casing (1) according to any of Claims 1 - 10.

12. Exhaust-gas turbine according to Claim 11, which has a bearing casing (14) connected to the turbine casing (1), wherein the turbine casing is connected to the bearing casing by means of connection elements (15).

13. Exhaust-gas turbine according to Claim 12, which has clamping elements (16) that are each pressed against the connection flange (2) of the turbine casing (1) and against the bearing casing (14) by one or more connection elements (15).

14. Exhaust-gas turbine according to Claim 11, in which the clamping elements (16) are pressed against the clamping edge (7).

15. Exhaust-gas turbine according to any of Claims 11 - 14, in which the connection elements (15) are screws or threaded pins.

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