Assembly for a turbine engine
By adopting a bolted connection scheme in the turbine engine, designing a radially open nut structure and selecting appropriate materials, the thermal expansion differential problem of the ceramic matrix composite exhaust cone was solved, achieving the effects of simplified manufacturing and improved mechanical strength.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SAFRAN CERAMICS SA
- Filing Date
- 2024-08-30
- Publication Date
- 2026-05-29
AI Technical Summary
In the prior art, exhaust cones made of ceramic matrix composites used in turbine engines are difficult to assemble under differential thermal expansion conditions, leading to increased mechanical strength and manufacturing complexity.
The bolted connection scheme is adopted, and the nut is designed as a multi-faceted structure that opens radially outward. The material selection of the screw and nut is combined to compensate for the difference in thermal expansion, and the dual function of the nut and spacer is achieved by using a single material.
It simplifies the manufacturing process, reduces material usage, improves mechanical strength, and ensures the structural integrity and stability of the components under thermal expansion differences.
Smart Images
Figure CN122122384A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to components for turbine engines, and more particularly to exhaust nozzle housings for turbine engines. It also relates to turbine engines incorporating such components. Background Technology
[0002] Figure 1 and Figure 2 A turbine engine 1, such as a turbofan engine, is schematically represented, having an axis X1 referred to below as the first axis X1. Such a turbine engine 1 typically includes, from upstream UP to downstream DWN, a fan 2, a low-pressure compressor 3, a high-pressure compressor 4, a combustion chamber 5, a high-pressure turbine 6, a low-pressure turbine 7, and an exhaust system downstream of the turbine engine block. The first axis X1 coincides with the axis of rotation of the rotor of the turbine engine 1.
[0003] The airflow F, specifically air, entering upstream of the turbine engine 1 first flows through the fan 2, and then splits into a main flow F1 that circulates in a channel called the annular main flow channel 8, and a bypass flow F2 that circulates in a channel called the annular bypass flow channel 9 surrounding the annular main flow channel 8.
[0004] In this document, unless otherwise stated, the terms "upstream" and "downstream" are defined relative to the direction of airflow within the turbine engine 1. Furthermore, the terms "longitudinal," "radial," and "circumferential" are defined relative to the axis X1 of the turbine engine 1, and the terms "inner" and "outer," as well as "inner side" and "outer side," are defined radially relative to the axis X1 of the turbine engine 1.
[0005] Downstream of the turbine engine, the exhaust system discharges the hot gas exiting the low-pressure turbine 7 through an annular mains duct 8. Typically, the exhaust system includes an exhaust housing 130 and an exhaust cone 120, also known as an injection cone, disposed downstream of the exhaust housing 130. The exhaust housing 130 typically has an inner annular ring 131 and an outer annular ring 132, forming an annular space between them that defines the annular mains duct 8 at the low-pressure turbine outlet. The gas exiting the low-pressure turbine then flows from upstream to downstream around the exhaust cone 120. In other words, the exhaust cone 120 forms the inner boundary of the annular mains duct. The exhaust cone 120 is mechanically connected to the inner annular ring 131 of the housing 130 via a connecting flange mechanically fastened to the housing 130.
[0006] Figure 3 An example of an exhaust cone 120 is shown. The exhaust cone 120 typically includes an outer annular wall 122 and an inner annular wall 121 disposed radially inside the outer annular wall 122. A baffle 123, typically flat or curved, may extend radially between the inner annular wall 121 and the outer annular wall 122 to form an acoustic attenuation cavity suitable for attenuating sound waves.
[0007] Furthermore, to reduce the weight of the turbine engine, the use of ceramic matrix composites, known as CMC materials, for many components of the turbine engine can be considered. In this case, the exhaust cone 120 can be made of ceramic matrix composites. The inner annular ring 131 and connecting flange of the exhaust housing 130 remain conventionally made of metal, such as titanium alloy, to ensure a certain level of mechanical strength.
[0008] The use of this CMC material, with its specific stiffness and thermal expansion characteristics, generates problems during operation due to differential thermal expansion. This affects the assembly of the various components mentioned above.
[0009] To compensate for this differential thermal expansion, conventional solutions for bolted connections involve using screws and nuts with washers and / or spacers. Screws can consist, for example, of standard screws. Nuts are typically made of nickel-based superalloys compatible with the operating temperature of the components. Using spacers made of a material with suitable thermal expansion allows for at least partial compensation for the differential expansion between components. This also partially compensates for the decrease in stiffness at high temperatures. An example of such a spacer is described in document WO2022129722A1.
[0010] This document aims to at least partially address the aforementioned problems by proposing a component for turbine engines that improves the attachment of the annular wall of the exhaust cone in the presence of thermal expansion constraints. Summary of the Invention
[0011] This disclosure improves this situation.
[0012] An assembly for a turbine engine is proposed, the turbine engine axis being referred to below as a first axis. The assembly includes an exhaust cone designed to allow gas to flow from upstream to downstream along the first axis in a mainstream, and a metal housing disposed upstream of the exhaust cone. The exhaust cone has an annular wall made of a composite material, particularly a ceramic matrix composite. The assembly includes a connecting flange connecting the annular wall to the housing. The assembly also includes bolts extending along a second axis, the bolts comprising screws and nuts, the nuts being configured to engage with the screws. The screws pass through corresponding openings in the annular wall and the connecting flange. The nut extends along the second axis between a first end and a second end, the first end possibly corresponding specifically to the radially outer end of the nut, configured to abut against one of the annular wall or the connecting flange, and the second end possibly corresponding specifically to the radially inner end of the nut, opposite the first end. The nut includes an outer annular surface having a first outer annular surface portion that flares radially outward. The first outer annular surface portion consists of a plurality of faces arranged circumferentially end-to-end and connected in pairs by edges.
[0013] The implementation of the first outer annular surface portion, which flares out radially and consists of multiple faces arranged circumferentially end-to-end and connected in pairs by edges, provides a significant advantage by allowing the use of less material and / or a smaller footprint while ensuring sufficient mechanical strength for the bolt. Indeed, the radially flared edges provide reinforcement to the nut. Therefore, the faces and edges can be adjusted to optimize the quality of the nut while ensuring sufficient mechanical strength.
[0014] The features described in the following paragraphs may be implemented optionally, independently, or in combination: Advantageously, the exhaust cone includes an inner annular wall and an outer annular wall. The connecting flange includes a radial annular wall, the outer radial end of which is connected to a cylindrical wall. The downstream end of the cylindrical wall is connected to a flexible sheet extending longitudinally along a first axis.
[0015] According to the first embodiment, the annular wall of the exhaust cone is formed by the outer annular wall of the exhaust cone. Screws pass through corresponding openings in the outer annular wall and the cylindrical wall of the connecting flange, fastening the outer annular wall of the exhaust cone and the cylindrical wall of the connecting flange together. Therefore, in this embodiment, the connecting flange is directly fastened to the outer annular wall of the exhaust cone by the nut of the present invention, which serves as the flow surface for the hot airflow.
[0016] According to a second embodiment, the annular wall of the exhaust cone includes an inner annular wall. A screw passes through a corresponding opening in one of the inner annular wall and the corresponding flexible piece of the connecting flange, fastening the inner annular wall of the exhaust cone and the corresponding flexible piece of the connecting flange together. In this embodiment, the connecting flange is directly fastened to the inner annular wall of the exhaust cone by the nut of the present invention, while allowing its upstream outer annular wall to remain unattached.
[0017] The nut advantageously includes an inner annular surface defining an opening for a screw channel. The inner annular surface specifically includes a first inner annular surface portion with threads, designed to mate with the screw, and a second inner annular surface portion, inserted along a second axis between the first inner annular surface portion and a first end of the nut. The second inner annular surface portion, together with the screw, defines an annular clearance.
[0018] The implementation of the inner annular surface allows the nut to function both as a spacer due to the annular gap between the second inner annular surface portion and the screw, and as a nut due to the first annular surface portion providing the threads for engagement between the screw and nut. This dual function of the nut allows for compensation of differential thermal expansion between bolted components, namely the annular wall of the vent cone and the connecting flange. The connecting flange can be made of metal, or alternatively, of ceramic matrix composites. In other words, the assembly involves at least one component made of ceramic matrix composites, for example, one component made of ceramic matrix composites and one component made of metal, or two components made of ceramic matrix composites. Furthermore, using a single component to enable the nut to perform both the nut and spacer functions allows for the use of a single material for both functions and simplifies the manufacturing steps of the assembly, particularly the sourcing, installation, and assembly of the components.
[0019] The first outer annular surface portion can open outward at an angle between 30° and 90°, preferably approximately equal to 45°.
[0020] The surface of the first outer annular portion advantageously extends along the second axis in a first dimension, which is 20% to 50% of the nut length.
[0021] The surface of the first outer annular portion can extend along the second axis between the same first axial position and the same second axial position on the second axis. This configuration has the advantage of being easy to implement.
[0022] The surface portion of the first outer annular surface may include at least a first surface and a second surface, which are arranged alternately and offset axially along a second axis by a fourth dimension, which is 0% to 30% of the first dimension. This configuration allows for further optimization of the overall dimensions of the nut while ensuring that it has a sufficient level of mechanical strength.
[0023] The surface of the first outer annular portion can advantageously extend along the second axis in at least two different dimensions, preferably alternately. For example, the surface of the first outer annular portion can extend along the second axis in two or three different dimensions.
[0024] The outer annular surface may advantageously also include a second outer annular surface portion, inserted between the first outer annular surface portion and the first end of the nut.
[0025] The second outer annular surface portion may have a body-of-rotation shape about a second axis and extend along the second axis in a second dimension, which is 10% to 80% of the nut length.
[0026] The second outer annular surface portion can have a cylindrical shape.
[0027] The second outer annular surface portion may have a conical shape, which opens outward at an angle strictly greater than 0° and less than or equal to 45°, preferably less than or equal to 10°, for example equal to 3.3°.
[0028] The outer annular surface may advantageously also include a third outer annular surface portion, inserted between the first outer annular surface portion and the second end of the nut. The third outer annular surface portion may extend substantially parallel to the second axis in a third dimension, which is 20% to 50% of the length of the nut.
[0029] The third outer annular surface portion may have a polygonal shape, particularly a hexagon, extending along the second axis. The edge of the first outer annular surface portion may be formed as an extension of the edge of the third outer annular surface portion.
[0030] The first outer annular surface portion may include four to eight faces, such as six faces.
[0031] The first inner annular surface portion may have a dimension along the second axis that is 20% to 90% of the nut length, for example, 20% to 50%, preferably substantially equal to 40%.
[0032] The second inner annular surface portion may have a dimension along the second axis that is 10% to 80% of the nut length, for example, 50% to 70%, preferably substantially equal to 60%.
[0033] At least one edge, or each edge, may lie in a plane. This plane may be parallel to or inclined relative to the second axis. The plane in which at least one edge lies may coincide with the second axis.
[0034] Advantageously, the nuts are made entirely of the same material, preferably steel, especially A286 steel. This steel has favorable thermal expansion properties to compensate for the differential thermal expansion between the annular wall of the exhaust cone and the connecting flange.
[0035] Advantageously, the screw is made of a material with a lower coefficient of thermal expansion than the nut material. The screw is preferably made of a nickel-chromium alloy, such as Inconel 718 alloy. Making the nut of a material with a higher coefficient of thermal expansion than the screw advantageously allows the clamping force between the annular wall of the vent cone and the connecting flange to be maintained, despite the thermal expansion effect.
[0036] The exhaust cone may advantageously include an outer annular wall made of a ceramic matrix composite and an inner annular wall disposed radially inside the outer annular wall. The outer annular wall may form the annular wall of the exhaust cone. Alternatively, the inner annular wall may form the annular wall of the exhaust cone.
[0037] According to another aspect, a turbine engine is proposed, which includes the components described above. Attached Figure Description
[0038] Other features, details, and advantages will become apparent from the following detailed description and from the analysis of the accompanying drawings, in which: Figure 1 A partial cross-sectional view of a turbine engine according to the prior art is shown schematically.
[0039] Figure 2 A partial cross-sectional view of a turbine engine according to the prior art is shown schematically.
[0040] Figure 3 A partial cross-sectional view of the exhaust cone of a turbine engine according to the prior art is shown schematically.
[0041] Figure 4 A partial cross-sectional view of a component according to a first embodiment is shown schematically.
[0042] Figure 5 A partial cross-sectional view of a component according to a second embodiment is shown schematically.
[0043] Figure 6 A first embodiment of the nut according to this document is schematically shown. Figure 6 A), and the second embodiment of the nut according to this document (A ...) Figure 6 B). Detailed Implementation
[0044] Now for reference Figure 4 and Figure 5 These figures schematically represent truncated views of the first and second embodiments of component 100 according to this document. Preferably, such component 100 can be implemented in a turbine engine having an axis X1, which is designated as a first longitudinal axis X1, as referenced above. Figure 1 , 2 As described in section 3. Furthermore, this document also relates to any type of turbine engine comprising component 100, particularly an aviation turbojet engine, preferably a turbofan engine.
[0045] Component 100 includes an exhaust cone 120 designed to allow gas to flow from upstream to downstream along a first axis X1 in the main flow F1, and a metal housing 130 disposed upstream of the exhaust cone 120. The exhaust cone 120 has an outer annular wall 122 and an inner annular wall 121, at least one of which is made of a composite material, particularly a ceramic matrix composite. In another possible embodiment, both the outer annular wall 122 and the inner annular wall 121 may be made of a composite material. Component 100 includes a connection flange 110 connecting the outer annular wall 122 and / or the inner annular wall 121 to the housing 130, as referenced. Figure 4 and Figure 5As shown in each of the embodiments described.
[0046] like Figure 4 and Figure 5 As shown, the housing 130 specifically includes an inner annular ring 131, which forms the internal boundary of the airflow along the main flow path F1. The downstream end of the inner annular ring 131 is connected to a radial annular wall 133. This radial annular wall 133 of the housing is bolted to a radial annular wall 112 of a connecting flange, which is thus longitudinally inserted between the inner annular wall 121 and the housing 130. The upstream end 124 of the outer annular wall 122 is advantageously arranged in the aerodynamic extension of the inner annular ring 131 of the housing 11 to facilitate the flow of hot air.
[0047] The connecting flange 110 can be made of metal, such as titanium alloy.
[0048] The connecting flange 110 includes a radially annular wall 112, the outer radial end of which is connected to a cylindrical wall 113. The downstream end of the cylindrical wall 113 is connected to a flexible sheet 114 extending longitudinally along a first axis X1. The flexible sheet 114 is preferably uniformly distributed circumferentially around the connecting flange 110. The cylindrical wall 113 includes annular openings 115. The downstream ends of the flexible sheets 114 each have an opening 116 to allow attachment screws to pass through at the upstream end of the inner annular wall 121 of the vent cone 120.
[0049] refer to Figure 4 and Figure 5 The assembly 100 also includes a bolt 200 extending radially along a second radial axis X2. The bolt 200 includes a screw 210 and a nut 220, the nut 220 being configured to mate with the screw 210. The nut 220 extends along the second axis X2 between a first end 221 and a second end 222, the first end 221 possibly corresponding specifically to the radially outer end of the nut (e.g., ...). Figure 4 and Figure 5 As shown), the second end 222 can specifically correspond to the radial inner end of the nut (e.g. Figure 4 and Figure 5 As shown), it is opposite to the first end 221.
[0050] according to Figure 4 In the first embodiment shown, the connecting flange 110 connects the inner annular wall 121 and the outer annular wall 122 to the housing 130. The outer annular wall 122 is made of a composite material, particularly a ceramic matrix composite. In this embodiment, the inner annular wall 121 can be made of a composite material or a metallic material. A screw 210 passes through an opening 115 in the outer annular wall 122 and an opening in the cylindrical wall of the connecting flange. Furthermore, the first end 221 of the nut 220 is configured to abut against one of the outer annular wall 122 and the cylindrical wall 113 of the connecting flange. In particular, in Figure 4In this case, the first end 221 of the nut 220 abuts against the cylindrical wall 113 of the connecting flange. Indeed, the location where the connecting flange meets the outer annular wall is subject to a strong thermal gradient due to the flow of hot gas against the outer annular wall, thus the use of bolts 200 as described herein is advantageous.
[0051] according to Figure 5 In the second embodiment shown, the outer annular wall 122 is advantageously free relative to the more upstream inner annular wall 121. Therefore, the inner annular wall 121 and the outer annular wall 122 can accommodate their differences in thermal expansion. This allows for ensuring the structural integrity of the assembly in the presence of a thermal gradient between the inner annular wall 121 (in contact with the "cooler" chamber) and the outer annular wall 122 (in contact with the annular main channel of hot gas), which could generate high thermomechanical stresses.
[0052] Figure 5 The components according to the second embodiment are shown. The inner annular wall is made of a composite material, particularly a ceramic matrix composite. A screw 210 passes through an opening 126 in the inner annular wall 121 and an opening 116 in the connecting flange plate 114. The first end 221 of a nut 220 abuts against one of the inner annular wall 121 and the flexible plate 114 of the connecting flange. In particular, in Figure 5 In the middle, the first end 221 of the nut 220 abuts against one of the flexible pieces 114 of the connecting flange.
[0053] The bolt 200, described in more detail below, can be applied to the first embodiment ( Figure 4 ) and the second embodiment ( Figure 5 The bolt therefore includes, for example, the following: Figure 4 and Figure 5 The screw 210 shown and as shown Figure 4 and Figure 5 The nut shown, and more clearly visible in Figure 6 A and Figure 6 B in.
[0054] The screw 210 specifically includes a threaded shank 211 and a screw head 212.
[0055] Screw 210 is preferably made of a material with a lower coefficient of thermal expansion than nut 220, which advantageously allows the annular wall of the vent cone and the connecting flange to remain clamped together despite the thermal expansion effect. Screw 210 is preferably made of a nickel-chromium alloy, such as Inconel 718 alloy.
[0056] The nuts are advantageously made entirely of the same material, preferably steel, especially A286 steel. This steel has favorable thermal expansion properties to compensate for the differential thermal expansion between the annular wall of the exhaust cone and the connecting flange.
[0057] Figure 6 A and Figure 6 B shows first and second variations of a nut that enable the formation of bolts for components according to this document, in the first or second embodiment of component 100.
[0058] The nut 220 may include an inner annular surface 223 defining an opening for a screw 210 channel. The inner annular surface 223 includes a threaded first inner annular surface portion 224 for engaging with the screw 210, and a second inner annular surface portion 225, which is inserted along a second axis X2 between the first inner annular surface portion 224 and a first end 221 of the nut 220. The second inner annular surface portion 225, together with the screw 210, defines an annular clearance 213.
[0059] The implementation of the inner annular surface allows the nut to function both as a spacer due to the annular gap between the second annular surface portion and the screw, and as a nut by providing the threaded first annular surface portion for engagement between the screw and the nut. This dual function of the nut allows for compensation of differential thermal expansion between bolted components, namely the annular wall of the vent cone and the connecting flange. The annular gap 213 is non-zero during installation to ensure it can function as a spacer for the assembly.
[0060] Furthermore, using a single component to enable the nut to perform both the functions of a nut and a spacer allows for the use of a single material for both functions and simplifies the manufacturing process of the entire assembly, particularly the sourcing, installation, and assembly of components.
[0061] The first inner annular surface portion 224 may have a dimension along the second axis that is 20% to 90% of the nut length, for example, 20% to 50%, preferably substantially equal to 40%. Alternatively, the dimension of the first inner annular surface portion 224 may be set to 1 to 2 times the diameter of the screw 210.
[0062] The second inner annular surface portion 225 may have a dimension along the second axis that is 10% to 80% of the nut length, for example, 50% to 70%, preferably substantially equal to 60%.
[0063] The nut 220 includes an outer annular surface 226 having a first outer annular surface portion 227 that flares out radially. The first outer annular surface portion 227 is composed of a plurality of faces 228 arranged circumferentially end to end and connected in pairs by edges 229.
[0064] An embodiment of the first outer annular surface portion, which flares out radially and consists of multiple faces arranged circumferentially end-to-end and connected in pairs by edges, offers the significant advantage of allowing the use of less material and / or a smaller footprint while ensuring sufficient mechanical strength for the bolt. Indeed, the radially flared edges perform a reinforcing function on the nut. Therefore, the faces and edges can be adjusted to optimize the quality of the nut while ensuring sufficient mechanical strength.
[0065] The first outer annular surface portion 227 can open outward in the form of rounded corners, particularly with a radius of 0.5 mm to 10 mm, for example, about 5 mm.
[0066] The first outer annular surface portion 227 can open outward at an angle between 30° and 90°, preferably approximately equal to 45°.
[0067] The surface 228 of the first outer annular surface portion 227 extends along the second axis X2 in a first dimension D1, which is 20% to 50% of the length D of the nut 220.
[0068] like Figure 6 As shown in Figure A, the various surfaces 228 of the first outer annular surface portion 227 can extend along the second axis X2 between the same first axial position and the same second axial position on the second axis X2. This configuration has the advantage of being easy to implement.
[0069] like Figure 6 As shown in Figure B, the surface 228 of the first outer annular surface portion 227 may include at least a first surface 228a and a second surface 228b, which are arranged alternately and axially offset along the second axis X2 by a fourth dimension D4, which is 0% to 30% of the first dimension D1. For example, the fourth dimension D4 may be less than or equal to 3 mm, preferably equal to 1 mm. These at least first and second surfaces can therefore be axially offset along the second axis X2 at this fourth distance, at at least one end, for example, at one end or at opposite ends of the first and second surfaces. This configuration allows for further optimization of nut size reduction while ensuring a sufficient level of mechanical strength.
[0070] The surface 228 of the first outer annular surface portion 227 can advantageously extend along the second axis X2 in at least two different dimensions, preferably alternately. For example, the surface of the first outer annular surface portion can extend along the second axis in two or three different dimensions.
[0071] The outer annular surface 226 may also include a second outer annular surface portion 230, which is inserted between the first outer annular surface portion 227 and the first end 221 of the nut 220.
[0072] The second outer annular surface portion 230 may have a body-of-rotation shape about the second axis X2 and extend along the second axis X2 in a second dimension D2, which is 10% to 80% of the length D of the nut 220.
[0073] The second outer annular surface portion 230 may have a cylindrical shape.
[0074] The second outer annular surface portion 230 may have a conical shape, which opens outward at an angle strictly greater than 0° and less than or equal to 45°, preferably less than or equal to 10°, for example about 3°, more specifically equal to 3.3°.
[0075] The outer annular surface 226 may also include a third outer annular surface portion 231, which is inserted between the first outer annular surface portion 227 and the second end 222 of the nut 220. The third outer annular surface portion 231 may extend substantially parallel to the second axis X2 in a third dimension D3, which is 20% to 50% of the length D of the nut 220.
[0076] The third outer annular surface portion may have a polygonal shape, particularly a hexagon, extending along the second axis. The edge of the first outer annular surface portion may be formed as an extension of the edge of the third outer annular surface portion.
[0077] The third annular surface portion may have a locking element for the nut at its end.
[0078] The first outer annular surface portion may specifically include four to eight faces, such as six faces.
[0079] Each edge 229 may advantageously be oriented substantially along the second axis X2. Each edge 229 may also lie in a plane that may contain the second axis X2 or be parallel to it. The plane containing the edge 229 may also be inclined relative to the axis X2.
[0080] As an example, for an annular wall with a thickness of approximately 3.57 mm, the screw can have a length of 27.7 mm, the nut can have a length of 16.5 mm, a maximum outer diameter of 15 mm, and an external radial dimension of 6.35 mm for the third outer annular surface portion.
Claims
1. An assembly (100) for a turbine engine (1), the assembly (100) having a first axis (X1), the assembly (100) comprising: - An exhaust cone (120) designed to allow gas to flow from upstream to downstream along a first axis (X1) in the main stream (F1), the exhaust cone (120) having annular walls (122, 121) made of a composite material, preferably a ceramic matrix composite. - A metal casing (130) is arranged upstream of the exhaust cone (120). - Connecting flange (110) to connect the annular wall (122, 121) to the housing (130), The assembly (100) further includes a bolt (200) extending along a second axis (X2), the bolt comprising a screw (210) and a nut (220), the nut (220) being configured to engage with the screw (210). The screw (210) passes through the annular wall (122, 121) and the corresponding openings (115, 116, 125, 126) in the connecting flange (110). A nut (220) extends along a second axis (X2) between a first end (221) and a second end (222), the first end (221) being configured to abut against one of annular walls (122, 121) or a connecting flange (110), and the second end (222) being opposite to the first end (221). The nut (220) includes an outer annular surface (226) having a first outer annular surface portion (227) that is radially outwardly flared. The first outer annular surface portion (227) is composed of a plurality of faces (228) arranged circumferentially end to end and connected in pairs by edges (229).
2. The component (100) according to claim 1, characterized in that, The nut (220) includes an inner annular surface (223) that defines an opening for a screw (210) channel. The inner annular surface (223) includes a threaded first inner annular surface portion (224) designed to mate with the screw (210), and a second inner annular surface portion (225) inserted along a second axis (X2) between the first inner annular surface portion (224) and a first end (221) of the nut (220). The second inner annular surface portion (225) together with the screw (210) defines an annular gap (213).
3. The component (100) according to any one of the preceding claims, characterized in that, The surface (228) of the first outer annular surface portion (227) extends along the second axis (X2) in the first dimension (D1), which is 20% to 50% of the length (D) of the nut (220).
4. The component (100) according to any one of the preceding claims, characterized in that, The surface (228) of the first outer annular surface portion (227) extends along the second axis (X2) between the same first axial position and the same second axial position on the second axis (X2).
5. The component (100) according to any one of claims 1 to 3, characterized in that, The surface (228) of the first outer annular surface portion (227) includes at least a first surface (228a) and a second surface (228b), which are arranged alternately and offset along the second axis (X2) by a fourth dimension (D4), which is 0% to 30% of the first dimension (D1).
6. The component (100) according to any one of claims 1 to 3 or 5, characterized in that, The surface (228) of the first outer annular surface portion (227) extends along the second axis (X2) in at least two different dimensions, preferably alternating.
7. The component (100) according to any one of the preceding claims, characterized in that, The outer annular surface (226) also includes a second outer annular surface portion (230) inserted between the first outer annular surface portion (227) and the first end (221) of the nut (220). The second outer annular surface portion (230) has a body shape of revolution about a second axis (X2) and extends along the second axis (X2) in a second dimension (D2) which is 10% to 80% of the length (D) of the nut (220).
8. The component (100) according to the preceding claim, characterized in that, The second outer annular surface portion (230) has a conical shape, which opens outward at an angle strictly greater than 0° and less than or equal to 45°, preferably less than or equal to 10°, for example equal to 3.3°.
9. The component according to any one of the preceding claims, characterized in that, The outer annular surface (226) also includes a third outer annular surface portion (231) inserted between the first outer annular surface portion (227) and the second end (222) of the nut (220). The third outer annular surface portion (231) extends substantially parallel to the second axis (X2) in a third dimension (D3), which is 20% to 50% of the length (D) of the nut (220).
10. The component (100) according to any one of the preceding claims, characterized in that, The nut (220) is made entirely of the same material, preferably A286 steel.
11. The component (100) according to the preceding claim, characterized in that, The screw (210) is made of a material with a lower coefficient of thermal expansion than the material of the nut (220), and the screw (210) is preferably made of a nickel-chromium alloy.
12. The component (100) according to any one of the preceding claims, characterized in that, The exhaust cone (120) includes an outer annular wall (122) made of ceramic matrix composite material and an inner annular wall (121) arranged radially inside the outer annular wall (122), the outer annular wall (122) forming the annular wall of the exhaust cone.
13. A turbine engine (1) comprising a component (100) according to any one of the preceding claims.