Turbine housing clamp assembly for a turbine, turbine and use of a turbine casing clamp assembly

Abstract

A turbine housing clamping connection (100) for a turbine (200), and a turbine having a turbine housing clamping connection are described herein. The turbine housing clamping connection comprises a bearing housing (110) and a turbine housing (120), and a clamping component (130) having a clamping flange clamped between a clamping portion of the bearing housing and a clamping portion of the turbine housing. The clamping flange has a bearing housing-side clamping surface (131) with a convexly curved clamping surface region (131). Furthermore, the convexly curved clamping surface region defines a minimum radius of curvature. A ratio of the minimum radius of curvature and an inner radius of the clamping surface is at least 0.1 and / or at most 10, and preferably at least 0.5 and / or at most 2.0, and still more preferably at least 1.0 and / or at most 1.4.

Description

Technical field

[0001] The present invention relates to a turbine housing clamping assembly for a turbine, a turbine with such a turbine housing clamping assembly, and a use of a turbine housing clamping assembly. background

[0002] Turbines, particularly radial turbines, are known from the prior art, comprising a bearing housing, a turbine housing, a heat shield, and a nozzle ring. Typically, either the heat shield is clamped axially between the bearing housing and the nozzle ring, and radially through the turbine housing; or the nozzle ring is clamped axially through the bearing housing and radially through the turbine housing. EP 1 428 983 A1, for example, describes an exhaust gas turbine housing.

[0003] In applications with frequently changing load conditions, and especially under high load conditions, wear can occur in the turbine. This fatigue wear occurs particularly on the bearing housing, which in turn can lead to further problems.

[0004] In light of the foregoing, there is a need for an improved nozzle ring for a turbine stage that can alleviate the aforementioned problems and, in particular, can be easily adapted to the specific requirements of a turbocharger and / or engine application. US 2020 / 173305 A1 describes a turbocharger consisting of a turbine housing that accommodates a turbine wheel; and a bearing housing that rotatably supports a connecting shaft associated with the turbine wheel, wherein a flange extends radially outward from one end of the turbine housing on a first side in the direction of the axis of rotation of the connecting shaft, and another flange extends radially outward from one end of the bearing housing on a second side, also in the direction of the axis of rotation of the connecting shaft, and the flange of the turbine housing and the flange of the bearing housing are connected to each other by means of a fastener in the direction of the axis of rotation of the connecting shaft. Summary of the invention

[0005] This problem is at least partially solved by a turbine housing clamping assembly for a turbine according to claim 1. Furthermore, the problem is solved by a turbine with a turbine housing clamping assembly according to claim 14 and by the use of a turbine housing clamping assembly according to claim 15. Further embodiments, modifications, and improvements will become apparent from the following description and the appended claims.

[0006] According to one embodiment, a turbine housing clamping assembly is provided for a turbine, in particular a radial exhaust gas turbine. The turbine housing clamping assembly comprises a bearing housing and a turbine housing, and a clamping component with a clamping flange clamped between a bearing housing clamping section of the bearing housing and a turbine housing clamping section of the turbine housing. The clamping flange has a bearing housing-side clamping surface with a convexly curved clamping surface area. Furthermore, the convexly curved clamping surface area defines a minimum radius of curvature. The ratio of the minimum radius of curvature to an inner radius of the clamping surface is at least 0.1 and / or at most 10, and preferably at least 0.5 and / or at most 2.0, and even more preferably at least 1.0 and / or at most 1.4. Brief description of the characters

[0007] The invention will now be explained in more detail with reference to embodiments, without these being intended to restrict the scope of protection defined by the claims.

[0008] The accompanying drawings illustrate embodiments and, together with the description, serve to explain the principles of the invention. The elements of the drawings are relative to one another and not necessarily to scale. Identical reference numerals denote similar parts.

[0009] The figures show: Figure 1 shows a turbine housing clamping assembly according to one embodiment. Figure 2 shows a turbine housing clamping assembly according to one embodiment. Figure 3a shows a clamping component according to one embodiment. Figure 3b shows a clamping component according to one embodiment. Detailed description

[0010] The following detailed description refers to the accompanying drawings, which form part thereof and illustrate specific embodiments in which the invention can be carried out. It should be understood that other embodiments may be used and structural or logical modifications may be made without altering the scope of protection of the present invention. The following detailed description should therefore not be interpreted as limiting, and the scope of protection of the present invention is defined by the attached claims. The described embodiments use specific language that should not be interpreted as limiting the scope of protection of the attached claims.

[0011] Figure 1 and 2Figures 1 and 2 show a turbine housing clamping assembly according to one embodiment, where a bearing housing-side clamping surface of a clamping flange is shown in a highly simplified manner. The clamping assembly is shown in an installed state within a turbine for illustrative purposes. Exemplary embodiments of the bearing housing-side clamping surface are shown in Figure 3. Figures 3a and 3b illustrated.

[0012] As in the embodiments of the Fig. 1 and 2As illustrated, a turbine housing clamping assembly 100 for a turbine 200, 300, in particular a radial exhaust gas turbine, is provided according to a general aspect of the invention. The turbine housing clamping assembly 100 comprises a bearing housing 110 and a turbine housing 120. Furthermore, the turbine housing clamping assembly 100 comprises (at least) a clamping component 130, 140 with a clamping flange 137, 147 clamped between a bearing housing clamping section of the bearing housing 110 and a turbine housing clamping section of the turbine housing 120. The clamping flange 137, 147 can be clamped or clamped directly (i.e., immediately without any further components arranged in between) through the bearing housing 110 and the turbine housing 120, or indirectly (i.e., further components are arranged between the clamping flange and the bearing housing 110 or turbine housing 120).

[0013] According to one embodiment, the clamping component is a heat shield 130. In Figure 1A clamping assembly 100 with a heat shield 130 as a clamping component is shown. The heat shield 130 is typically a substantially disc-shaped partition for shielding the bearing housing 110 from hot gases or exhaust gases flowing through an inlet channel of the turbine. Preferably, the turbine housing clamping assembly 100 also includes a nozzle ring 140 – shown here as a further clamping component. The heat shield 130 can be axially clamped by its clamping flange 137 between the bearing housing clamping section of the bearing housing 110 and the nozzle ring 140, and clamped by the turbine housing clamping section of the turbine housing 120. The heat shield 130 can also comprise one or more supports or edges 121, 144 for bearing against a support or edge 141 of the bearing housing 110 and / or for bearing against the turbine housing 120.Furthermore, the clamping assembly 100 can have one or more tabs 145 on the bearing housing 110, which can be fastened to the turbine housing with screws 142. By tightening the tabs 145, the heat shield 130 and the nozzle ring 140 are clamped between the turbine housing 120 and the bearing housing 110 and thus secured axially. In a rest mode of the turbine, when the turbine housing 120 and the bearing housing 110 are cold, a circumferential, cylindrical inner surface of the turbine housing 120 preferably rests on a circumferential, cylindrical outer surface of the bearing housing 110 and is thereby centered relative to a turbine axis of the turbine and the turbine wheel 143 arranged thereon.

[0014] According to another embodiment, the clamping component 130, 140 is a nozzle ring 140. In Figure 1 The nozzle ring 140 is also provided as another such clamping component.

[0015] In Figure 2Figure 1 illustrates another example of a clamping assembly 100, in which the clamping component is a nozzle ring 140. The turbine housing clamping assembly 100 can further comprise a heat shield 160. The heat shield 160 can be arranged radially further inward than the nozzle ring 140 and axially clamped by a second bearing housing clamping section. Furthermore, the heat shield 160 can be axially and radially clamped by the nozzle ring 140, for example, by means of a support for the nozzle ring 140. The heat shield 160 can typically be a substantially disc-shaped partition for shielding the bearing housing from hot gases or exhaust gases flowing through an inlet channel of the turbine. The heat shield 160 can further comprise one or more supports for bearing against the bearing housing 110 and / or for bearing against the nozzle ring 140.

[0016] The clamping flange 137, 147 of the clamping component - at least one of the in Fig. 1 and 2The clamping components 130, 140 shown have a bearing housing-side clamping surface 131 with a convexly curved clamping surface area 132. Figures 3a and 3b The design forms of the bearing housing-side clamping surface 131 are illustrated using the example of the clamping flange 137 of a heat shield 130. The bearing housing-side clamping surface can be designed accordingly if the clamping component is not a heat shield, but, for example, a nozzle ring 140, and the description of the clamping flange 137 is analogously applicable to the clamping flange 147.

[0017] In general terms, the clamping component 130, 140 (as well as the bearing housing and the turbine housing) is designed to completely surround a turbine shaft. The clamping component 130, 140 can have a substantially disk-shaped cross-section. The clamping flange is preferably clamped over the entire circumference of the clamping component 130, 140 between the bearing housing clamping section of the bearing housing 110 and the turbine housing clamping section of the turbine housing 120.

[0018] The convex curved clamping surface area 132 of the bearing housing-side clamping surface is preferably arranged radially outside the clamping flange 137. Figures 3a and 3bFigure 1 shows examples of the bearing housing-side clamping surface 131 with a radially outwardly arranged convexly curved clamping surface area 132. The convexly curved clamping surface area 132 has a convexly curved section directed away from the bearing housing 110 from radially inward to radially outward. The axial direction is defined by the turbine axis, while the radial direction extends perpendicular to the axial direction. Figure 3a The radial direction R (from radially inner to radially outer) and the axial direction A are each symbolized by an arrow. In other words, the radially outer clamping surface area 132 is convexly curved in a cross-sectional view containing a turbine axis.

[0019] The convexly curved clamping surface area 132 defines a minimum radius of curvature RK. The radius of curvature RK is in Figure 3asymbolized by a double arrow. The convexly curved clamping surface area 132 further defines a segment of curvature. The segment of curvature is slightly or gently convexly curved or rounded.

[0020] Here, a radially inner end 133 of the convexly curved clamping surface area 132 can correspond to an axially outermost point of the convexly curved clamping surface area 132 on the bearing housing side, as for example in Figure 3b as shown. In this case, the radially inner end 133 has the smallest distance (viewed in the rest state) to the bearing housing clamping section, and / or is clamped directly to the bearing housing clamping section. Alternatively, a point on the convexly curved clamping surface area 132 spaced from the radially inner end 133 can also correspond to an axially outermost point on the bearing housing side, as for example in Figure 3a depicted.

[0021] In other words, an axially outermost point of the curved segment (as viewed from the bearing housing) can correspond to a radially inner end 133, with the clamping surface area extending away from the bearing housing 110 from the radially inner end 133 to a radially outer end 135. Alternatively, an axially outermost point of the curved segment can also be located at any position along the curved segment.

[0022] The bearing housing-side clamping surface 131 can have one or more clamping surface areas which are clamped by the bearing housing clamping section. Typically, the bearing housing-side clamping surface defines at least one further clamping surface area. The further clamping surface area is preferably a radially inner clamping surface area, and / or a radially outermost clamping surface area. For example, Figure 3ba bearing housing-side clamping surface 131 with the convexly curved clamping surface area 132, a radially inner clamping surface area and a radially outermost clamping surface area.

[0023] The radially inner clamping surface area and / or the radially outermost clamping surface area are preferably not convexly curved, but essentially flat. However, for example, the radially inner clamping surface area and / or the radially outermost clamping surface area may also have a convexly shaped section with a radius of curvature that is smaller than the minimum radius of curvature of the convexly curved clamping surface area 132.

[0024] In alternative embodiments, the bearing housing-side clamping surface does not have a radially outermost clamping area. In this case, the convexly curved (radially outer) clamping area extends to the radial end 134 of the bearing housing-side clamping surface. Figure 3aIllustrates a bearing housing-side clamping surface 131 in which the radially outer end 135 of the convexly curved clamping surface area 132 corresponds to the radial end 134 of the bearing housing-side clamping surface.

[0025] The convexly curved clamping surface area is preferably a radially outer clamping surface area of ​​the bearing housing-side clamping surface. The bearing housing-side clamping surface can also have a radially inner clamping surface area. The convexly curved (radially outer) clamping surface area 132 connects continuously, preferably tangentally, to the radially inner clamping surface area. For example, Figure 3bA tangent-continuous transition from the radially inner end 133 to the flat radially inner clamping surface area. Preferably, in a cross-sectional view including a turbine axis, the radially inner clamping surface area extends in a straight line in the radial direction. Thus, a smooth, continuous transition between the convexly curved clamping surface area and the radially inner clamping surface area can be achieved. This also helps to counteract high local surface pressure, both in steady-state and transient operating conditions. The radially inner clamping surface area can be essentially flat (viewed in the radial direction).

[0026] Additionally or alternatively, the bearing housing-side clamping surface can have the radially outermost clamping area. This radially outermost clamping area can transition smoothly, preferably tangentally, to the convexly curved (radially outer) clamping area. Thus, a smooth, continuous transition is preferably present between the convexly curved (radially outer) clamping area and the radially outermost clamping area. The radially outermost clamping area can be essentially flat (viewed in the axial direction) and may deviate slightly or smoothly from a flat profile in the area of ​​transition to the convexly curved clamping area.

[0027] The inner radius of the clamping surface is the radius measured from the center of gravity of the turbine axis or the center of gravity of a cross-sectional view of the clamping component. According to the present disclosure, the inner radius is the radius measured when the turbine housing clamping assembly or the turbine is at rest. For example, under high load conditions, a slight expansion and thus a change in the inner radius may occur due to heating. All characteristic values ​​or parameters disclosed herein are values ​​measured at rest unless expressly described otherwise.

[0028] The inner radius is the radius of the convexly curved clamping surface area, preferably the radius at the axially outermost point of the curved clamping surface area as viewed from the bearing housing side. In some embodiments, the inner radius is the radius of the radially inner end 133. In other words, the inner radius is preferably the radial distance between the center of gravity of the turbine axis and the axially outermost point of the curved clamping surface area as viewed from the bearing housing side.

[0029] The inventors recognized that in turbine housing clamping connections known from the prior art, tilting or shifting of the contact surface between the bearing housing and the clamping component (e.g., a heat shield) can occur due to asymmetric heating between the bearing housing 110 and the clamping component (e.g., a heat shield). For example, the bearing housing may be made of the alloy GGG40, and the clamping component of a higher-alloy, usually heat-resistant material. The clamping component is typically located in a fluid channel and therefore becomes hotter than the contact point between the bearing housing and the clamping component. The clamping component heats up faster during operation and typically has a higher coefficient of thermal expansion than the bearing housing. Due to this asymmetric heat input, relative movement of the clamping component with respect to the bearing housing occurs during the heating process and under changing load conditions.

[0030] The tilting of the contact surface between the bearing housing and the clamping component in turbine housing clamping connections known from the prior art results in a high local surface pressure. Due to the relative movement, this highly stressed area migrates across the contact surface of the bearing housing 110 (the bearing housing clamping section) and causes fatigue wear, which in turn can lead to further problems such as loss of bolt preload or gas leakage.

[0031] The turbine housing clamping assembly according to embodiments of the present disclosure comprises a clamping component 130 with a convexly curved clamping surface area 132, which significantly reduces wear of the components, and in particular of the bearing housing. By providing the clamping surface area with a slightly or gently convexly curved shape, a broad contact area of ​​the clamping surface can be ensured both under a "hot" condition (i.e., under high load conditions or at high temperatures of a fluid in the radial turbine), as well as during the entire heating process and in a resting state, and thus high local surface pressure can be prevented.Due to its slightly convex curved shape, an extensive contact area exists between the bearing housing clamping section and the clamping surface on the bearing housing side, both in steady-state and transient operating conditions, thus substantially reducing wear. Thanks to the convexly curved clamping surface area designed according to the invention, a slight tilting of the clamping component is permitted during the warm-up process without creating an excessively high local contact pressure in the contact area between the bearing housing clamping section and the clamping surface on the bearing housing side compared to a cold state.

[0032] The inventors have further recognized that high local surface pressure and associated fatigue wear can be most effectively counteracted if the ratio of the minimum radius of curvature to an inner radius of the clamping surface is at least 0.1 and / or at most 10, preferably at least 0.5 and / or at most 2.0, and even more preferably at least 1.0 and / or at most 1.4.

[0033] According to embodiments of the present disclosure, the curved clamping surface area is designed to ensure substantially planar contact with the bearing housing clamping section when the clamping flange tilts. Tilting here means that a radially inner part of the clamping flange is moved axially away from the bearing housing and / or towards the turbine housing relative to a radially outer part of the clamping flange (tilts). The tilting can involve a rolling movement and / or a displacement movement of the clamping surface. Thus, tilting can also occur without a fixed tilting point of the clamping surface being necessary. Planar contact here does not necessarily mean full-surface contact between the bearing housing clamping section and the convexly curved clamping surface area.The curved clamping surface area is designed to ensure broad contact with the bearing housing clamping section, thus preventing the formation of high local surface pressure. The convexly curved clamping surface area is therefore designed to counteract wear on the bearing housing.

[0034] According to one aspect, an axial offset t between a bearing housing-side outermost point of the curved clamping surface area 132 and the radially outer end 135 of the curved clamping surface area 132 is at least 0.01 mm and / or at most 0.5 mm, preferably 0.02 mm and / or at most 0.2 mm, and even more preferably at least 0.03 mm and / or at most 0.1 mm. Figure 3aThe axial offset t is illustrated by a double arrow. This axial offset can refer to the maximum achievable radius of curvature RK during operation, and in particular to the resting state. Under higher load conditions, tilting of the clamping flange can occur, which can reduce the axial offset t.

[0035] Additionally or alternatively, an axial offset t between the radially inner end 133 of the curved clamping surface area 132 and the radially outer end 135 of the curved clamping surface area 132 can be at least 0.01 mm and / or at most 0.5 mm, preferably 0.02 mm and / or at most 0.2 mm, and even more preferably at least 0.03 mm and / or at most 0.1 mm. Due to the convex curvature, the radially outer end 135 is offset axially towards the turbine housing. In some embodiments, the radially inner end 133 is offset axially towards the bearing housing due to the convex curvature (as, for example, in Figure 3bshown), and in other embodiments, due to the convex curvature, also axially offset towards the turbine housing (as, for example, in Figure 3a (shown). The radially outer end 135 can be the radially outermost point reachable during operation at which clamping with the bearing housing clamping section of the bearing housing 110 takes place.

[0036] In one aspect, the minimum radius of curvature RK of the convexly curved clamping surface area 132 is at least 20 mm and / or at most 1000 mm, and preferably at least 50 mm and / or at most 500 mm, more preferably 100 mm and / or at most 200 mm, and most preferably at least 140 mm and / or at most 160 mm. In an exemplary embodiment, the minimum radius of curvature RK is 150 mm. A radius of curvature RK in the aforementioned range ensures a curvature that deviates sufficiently from a flat clamping surface area while simultaneously not exhibiting excessive curvature. Additionally or alternatively, the inner radius DR of the clamping surface or the convexly curved clamping surface area 132 can be at least 20 mm and / or at most 300 mm, preferably at least 100 mm and / or at most 140 mm.

[0037] The curved clamping surface area 132 can have a radial extent of at least 0.5 mm and / or at most 10 mm. Preferably, the curved clamping surface area 132 has a radial extent of at least 3 mm and / or at most 6 mm. In embodiments in which the clamping surface comprises the radially outermost clamping surface area, the radial distance between the radially inner end 133 of the curved clamping surface area 132 and the radial end 134 of the bearing housing-side clamping surface can be at least 2 mm and / or at most 20 mm, preferably at least 6 mm and / or at most 10 mm.

[0038] The ratio of the radial extent of the curved clamping surface area 132 to the inner radius of the clamping surface or the convexly curved clamping surface area 132 can be at least 0.005 and / or at most 0.1, preferably at least 0.02 and / or at most 0.05.

[0039] In a preferred embodiment, the ratio of the axial offset t to the radial extent of the curved clamping surface area 132 is at least 5*10⁻³ and / or at most 0.02, and preferably at least 8*10⁻³ and / or at most 0.015. A ratio in the aforementioned range ensures a curvature that deviates sufficiently from a flat clamping surface area and at the same time does not lead to excessive curvature.

[0040] The curved clamping surface area 132, and in particular the radially inner end 133 and the radially outer end 135 of the convexly curved clamping surface area 132, define the segment of curvature. A central angle α α of the segment of curvature can be at least 0.5° and / or at most 4°, preferably at least 1.2° and / or at most 2.0°. Figure 3a The central angle Alpha α is illustrated.

[0041] Additionally or alternatively, the ratio of the axial offset t to the radius of curvature RK can be at least 2*10 -4< and / or at most 2*10 -3< , and preferably at least 3*10 -4< and / or at most 8*10 -4< .

[0042] The tangent angle of the curved clamping surface area 132 with respect to the radial direction can be at least 0.5° and / or at most 4°, preferably at least 1.2° and / or at most 2.0°. Furthermore, in a cross-sectional view containing the turbine axis, at least one tangent angle of the curved clamping surface area 132 with respect to the radial direction can be at least 0.5°, preferably at least 1.2°, and / or all tangent angles of the curved clamping surface area 132 with respect to the radial direction can be at most 4°, preferably at most 2.0°.

[0043] The other sides of the clamping flange, such as a turbine housing-side clamping surface, are not particularly restricted according to the present disclosure and can be designed according to clamping flanges known in the prior art.

[0044] According to one aspect, a turbine, preferably a radial turbine 200, 300, is provided. The turbine has the turbine housing clamping assembly according to one of the embodiments described herein. In one embodiment, the turbine is a utility turbine and / or an exhaust gas turbine. For example, the exhaust gas turbine can be an exhaust gas turbocharger turbine. According to one embodiment, a turbocharger is provided, and the turbine has a turbine according to one of the embodiments described herein. The turbine can further have a turbine wheel 143.

[0045] One aspect concerns the use of a turbine housing clamping assembly for a radial turbine to counteract wear on a bearing housing of the radial turbine. The turbine housing clamping assembly and / or the radial turbine can be configured according to any of the embodiments disclosed herein. The turbine housing clamping assembly has a convexly curved clamping surface area, particularly according to one of the embodiments disclosed above.

[0046] Although specific embodiments have been presented and described herein, it is within the scope of the present invention to suitably combine or modify the embodiments shown without deviating from the scope of protection of the present invention. Reference symbol list:

[0047] 100 Turbine housing clamping assembly 110 Bearing housing 120 Turbine housing 121 Support, edge 130, 160 Heat shield 131 Bearing housing-side clamping surface 132 Convex curved clamping surface area 133 Radial inner end of the convex curved clamping surface area 134 Radial end of the bearing housing-side clamping surface 135 Radial outer end of the convex curved clamping surface area 140 Nozzle ring 141 Support, edge 142 Fastening, screw 143 Turbine wheel 144 Support 145 Tab 150 Turbine shaft 200, 300 Radial turbine

Claims

1. Turbine housing clamping connection (100) for a turbine (200, 300), in particular a radial exhaust gas turbine, having: - a bearing housing (110) and a turbine housing (120); and - a clamping component (130, 140) comprising a clamping flange clamped between a bearing housing clamping portion of the bearing housing (110) and a turbine housing clamping portion of the turbine housing (120); wherein the clamping flange has a bearing-housing-side clamping surface (131) comprising a convexly curved clamping surface region (132), wherein the convexly curved clamping surface region defines a minimum radius (RK) of curvature, and wherein a ratio of the minimum radius (RK) of curvature to an inner radius of the clamping surface (131) is at least 0.1 and / or at most 10, and preferably at least 0.5 and / or at most 2.0, and more preferably at least 1.0 and / or at most 1.4, wherein the inner radius is the radius at the axially outermost point, as viewed from the bearing housing side, of the convexly curved clamping surface region.

2. Turbine housing clamping connection (100) according to Claim 1, wherein the convexly curved clamping surface region is a radially outer clamping surface region of the bearing-housing-side clamping surface (131), wherein the bearing-housing-side clamping surface (131) further has a radially inner clamping surface region, and wherein the radially outer clamping surface region adjoins the radially inner clamping surface region in a continuous manner, preferably a tangentially continuous manner, in particular wherein, in a cross-sectional view containing a turbine shaft, the radially inner clamping surface region extends in a straight line in the radial direction.

3. Turbine housing clamping connection (100) according to either of the preceding claims, wherein the curved clamping surface region is constructed to guarantee substantially surface-to-surface contact with the bearing housing clamping portion when the clamping flange tilts.

4. Turbine housing clamping connection (100) according to any one of the preceding claims, wherein an axial offset (t) between the radially inner end (133) of the curved clamping surface region (132) and a radially outer end (135) of the curved clamping surface region (132) is at least 0.02 mm and / or at most 0.2 mm, preferably at least 0.03 mm and / or at most 0.1 mm.

5. Turbine housing clamping connection (100) according to any one of the preceding claims, wherein the radius (RK) of curvature is at least 20 mm and / or at most 1000 mm, and preferably at least 100 mm and / or at most 200 mm, and more preferably at least 140 mm and / or at most 160 mm.

6. Turbine housing clamping connection (100) according to any one of the preceding claims, wherein the inner radius of the clamping surface (131) is at least 20 mm and / or at most 300 mm, preferably at least 100 and / or at most 140 mm.

7. Turbine housing clamping connection (100) according to any one of the preceding claims, wherein the curved clamping surface region (132) defines an osculating circle segment, and wherein a central angle alpha (α) of the osculating circle segment is at least 0.5° and / or at most 4°, preferably at least 1.2° and / or at most 2.0°.

8. Turbine housing clamping connection (100) according to any one of the preceding claims, wherein in a cross-sectional view containing the turbine shaft, at least one tangential angle of the curved clamping surface region (132) relative to the radial direction is at least 0.5°, preferably at least 1.2°, and / or all tangential angles of the curved clamping surface region (132) relative to the radial direction are at most 4°, preferably at most 2.0°.

9. Turbine housing clamping connection (100) according to any one of the preceding claims, wherein the curved clamping surface region has a radial extent of at least 0.5 mm and / or at most 10 mm, preferably at least 3 mm and / or at most 6 mm, and / or wherein a ratio of the radial extent of the curved clamping surface region to the inner radius of the clamping surface (131) is at least 0.005 and / or at most 0.1, preferably at least 0.02 and / or at most 0.05.

10. Turbine housing clamping connection (100) according to any one of the preceding claims, wherein a ratio of the axial offset (t) to the radial extent of the curved clamping surface region is at least 5*10-3 and / or at most 0.02, and preferably at least 8*10-3 and / or at most 0.015.

11. Turbine housing clamping connection (100) according to any one of the preceding claims, wherein the clamping component (130, 140) is a heat shield (130).

12. Turbine housing clamping connection (100) according to Claim 11, further having a nozzle ring (140), wherein the heat shield (130) is clamped axially between the bearing housing clamping portion of the bearing housing (110) and the nozzle ring (140).

13. Turbine housing clamping connection (100) according to any one of Claims 1 to 10, wherein the clamping component (130, 140) is a nozzle ring (140).

14. Turbine, in particular radial-flow turbine (200, 300), having the turbine housing clamping connection (100) according to any one of the preceding claims, in particular wherein the turbine (200, 300) is a power turbine and / or an exhaust gas turbine, in particular an exhaust turbocharger turbine.

15. Use of a turbine housing clamping connection (130, 140), in particular according to any one of the preceding Claims 1 to 13, for a radial-flow turbine (200, 300), comprising a convexly curved clamping surface region for countering wear on a bearing housing (110) of the radial-flow turbine (200, 300).

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