Fuse structure for necking bolt of aero-engine and aero-engine

Abstract

The application provides a fuse structure for a necking bolt of an aero-engine and the aero-engine. The fuse structure for the necking bolt of the aero-engine comprises a first taper wall, a second taper wall, a plurality of protective shells, a first connecting piece and a connecting assembly. One end of the first taper wall is used for supporting a first bearing. One end of the second taper wall is connected with an intermediate nacelle frame through the first connecting piece. The other end of the first taper wall is connected with the other end of the second taper wall through the connecting assembly. The protective shells are installed on the other end of the first taper wall. A cavity is formed between each protective shell and the first taper wall. The connecting assembly is covered in the cavity. The connecting assembly comprises a fuse bolt assembly. When the fuse bolt assembly is disconnected, the cavity is used for accommodating the disconnected part of the fuse bolt assembly close to the first taper wall. The protective shells are arranged so that when the fuse bolt is broken, the broken part is accommodated by the protective shells and impact damage to the rotor structure is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engines, in particular to a fuse structure for a necking bolt of an aero-engine and the aero-engine. BACKGROUND

[0002] The aero-engine needs to ensure that the fan blade off (FBO) event does not lead to catastrophic consequences, and for this purpose, a fuse design is applied to the engine design to ensure the safety of the aero-engine in the FBO event.

[0003] At present, a common fuse design scheme is to set a fuse component, such as a necking bolt or a tapered wall with a thinning section, near the No. 1 bearing closest to the fan. The fuse structure for the necking bolt of the aero-engine fails under a predetermined load, reduces the unbalanced load transmitted to the intermediate nacelle through the bearing and its support, and avoids the damage of other key components of the engine.

[0004] The tapered wall thinning section will cause the front section of the fused tapered wall to collide and rub with the fan shaft, increasing the risk of fire, and also easily damaging the lubrication of the No. 1 bearing, causing dry grinding, overheating and jamming of the bearing, and causing the engine to not rotate normally. For the fuse bolt mode, the fuse bolt will fall off after failure, which will cause impact damage to the rotor structure, and the tapered wall also has the risk of colliding and rubbing with the fan shaft. In order to reduce the secondary collision risk after fusing, some structures increase a second layer of tapered wall device, but this device increases the overall weight of the engine and increases the operating cost.

[0005] Based on this, the present application inventors designed a fuse structure for a necking bolt of an aero-engine and an aero-engine to solve the above technical problems. SUMMARY

[0006] The technical problem solved by the present application is to overcome the defects that the fused bolt of the fuse structure for the necking bolt of the aero-engine is easy to collide with the fan blade or the front section of the fused tapered wall is easy to collide with the fan shaft in the prior art, and to provide a fuse structure for a necking bolt of an aero-engine and an aero-engine.

[0007] The present application solves the above technical problems by the following technical scheme:

[0008] The present application provides a fuse structure for a necking bolt of an aero-engine, characterized in that it comprises:

[0009] The first tapered wall, the second tapered wall, the plurality of protective shells, the first connecting piece and the connecting assembly, one end of the first tapered wall is used to support the first bearing;

[0010] One end of the second conical wall is connected to the intermediate casing frame through a first connecting member, the other end of the first conical wall is connected to the other end of the second conical wall through the connecting assembly, the protective shell is mounted on the other end of the first conical wall, a cavity is formed between each protective shell and the first conical wall, and the connecting assembly is covered in the cavity.

[0011] The connecting assembly comprises a fuse bolt assembly, and when the fuse bolt assembly is disconnected, the cavity is used for accommodating the disconnected part of the fuse bolt assembly close to the first conical wall.

[0012] According to an embodiment of the present application, the other end of the first conical wall is provided with at least two mounting plates arranged at intervals, mounting gaps are formed between adjacent mounting plates, the protective shell is connected to the mounting plate, and the first connecting member passes through the mounting gap and is connected to the second conical wall and the intermediate casing frame.

[0013] The second connecting member and the fuse bolt assembly pass through the mounting plate and are connected to the second conical wall.

[0014] According to an embodiment of the present application, the fuse bolt assembly comprises a bolt body and a bolt gasket.

[0015] The bolt gasket is located on the side of the first conical wall away from the second conical wall, the bolt body is arranged in the bolt gasket and is connected to the first conical wall and the second conical wall.

[0016] A limiting hole is formed in the middle of the bolt gasket, the hole wall of the limiting hole is arranged in an arc shape, and an arc-shaped boss is arranged on the bolt body and is matched with the arc-shaped hole wall of the limiting hole.

[0017] According to an embodiment of the present application, a first matching hole matched with the fuse bolt is formed in the first conical wall, and a second matching hole matched with the fuse bolt is formed in the second conical wall.

[0018] A contraction section is arranged in the middle of the bolt body, a rotation-stopping boss is further arranged on the bolt body, and in the mounted state, the contraction section is located in the first matching hole and the rotation-stopping boss is located in the second matching hole.

[0019] According to an embodiment of the present application, the fuse bolt assembly further comprises an elastic bushing and a mounting nut, the elastic bushing is sleeved on the outside of the contraction section, and the mounting nut is arranged on the side of the second conical wall away from the first conical wall and is threadedly connected with the bolt body.

[0020] According to one embodiment of the present application, the connecting assembly further comprises a second connecting member, which is located in the protective shell and used to connect the first tapered wall and the second tapered wall;

[0021] The second connecting member comprises a connecting bolt, an elastic member and a connecting nut, and the elastic member is sleeved on the connecting bolt;

[0022] The elastic member is mounted on the side of the mounting plate away from the second tapered wall, and the connecting nut is located on the side of the second tapered wall away from the mounting plate and is threadedly connected with the connecting bolt.

[0023] According to one embodiment of the present application, a plurality of protective shells are uniformly arranged along the outer circumferential side of the first tapered wall, and a plurality of second connecting members are arranged between adjacent protective shells and used to connect the second tapered wall and the intermediate casing.

[0024] According to one embodiment of the present application, an oil supply pipeline is further arranged on the outer side of the first tapered wall, one end of the oil supply pipeline extends to the first bearing, and the other end extends to the intermediate casing frame.

[0025] The length of the oil supply pipeline is adjustable.

[0026] According to one embodiment of the present application, the oil supply pipeline is connected with the first tapered wall through a mounting bracket, and a corrugated section is arranged on the side of the oil supply pipeline close to the intermediate casing frame.

[0027] According to one embodiment of the present application, a receiving groove is arranged on the side of the second tapered wall facing the first tapered wall, and the first tapered wall is sleeved in the receiving groove and connected with the second tapered wall.

[0028] The outer circumferential part of the first tapered wall connected with the second tapered wall is arranged in an arc shape.

[0029] The present application further provides an aero-engine, which is characterized in that comprising:

[0030] An intermediate casing frame;

[0031] A first bearing;

[0032] The fuse structure for the necking bolt of the aero-engine described above, one end of the fuse structure is connected with the first bearing, and the other end is connected with the intermediate casing frame.

[0033] The positive progress effect of the present application is that:

[0034] The fuse structure for the necking bolt of the aero-engine has the following advantages:

[0035] I. The first and second tapering walls are connected by a fuse bolt assembly, and the first tapering wall is provided with a protective shell outside the fuse bolt assembly, so that when the fuse bolt breaks, the broken part is accommodated by the protective shell and will not cause impact damage to the rotor structure.

[0036] II. The contact surface of the bolt body and the bolt gasket is an arc surface, so that the contraction section of the bolt body is not subjected to bending moment, and the bolt body only bears tension, so that the design calculation result accuracy and structural reliability are increased.

[0037] III. An elastic bushing is arranged outside the contraction section of the bolt body, so that the tightening torque of the bolt body during installation can be accurately controlled, the dispersion of the pre-tightening force is reduced, and the connection reliability of the bolt body to the first and second tapering walls is increased.

[0038] IV. The oil supply pipeline is provided with a corrugated section near one side of the intermediate casing frame, so that the circumferential swinging movement of the first tapering wall will not affect the integrity of the pipeline and will not damage the oil supply pipeline, thereby ensuring the function of the No. 1 bearing and its extrusion oil film damper. BRIEF DESCRIPTION OF DRAWINGS

[0039] The above and other features, properties, and advantages of the present application will become more apparent by the following description with reference to the accompanying drawings and embodiments, in which:

[0040] Figure 1 is a schematic view of part of the structure of an aero-engine of the present application;

[0041] Figure 2 is a schematic view of the structure of a fuse structure for a necking bolt of an aero-engine of the present application;

[0042] Figure 3 is a schematic view of the structure of a fuse structure for a necking bolt of an aero-engine of the present application; Figure 2

[0043] Figure 4 is a schematic view of the structure of a fuse structure for a necking bolt of an aero-engine of the present application; Figure 2

[0044] Figure 5 is a schematic view of the installation of the fuse bolt assembly of the present application;

[0045] Figure 6 is a schematic view of the structure of an embodiment of the fuse bolt assembly of the present application;

[0046] Figure 7 is a schematic view of the structure inside the protective shell of the present application;

[0047] Figure 8 is a sectional view of an angle of the second connecting piece; ​​

[0048] Figure 9 Figure 1 is a matching state diagram of an embodiment of the first and second conical walls in the prior art of the present application;

[0049] Figure 10 Figure 2 is a matching state diagram of an embodiment of the first and second conical walls in the prior art of the present application; Figure 7 Figure 3 is an enlarged structural schematic diagram of A in Figure 2;

[0050] Figure 11 Figure 4 is a sectional view of an embodiment of the fuse structure for the necking bolt of an aero-engine in the present application. DETAILED DESCRIPTION

[0051] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0052] Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings. The detailed description of the present application will now be made with specific reference to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although the terms used in the present application are selected from generally known and used terms, some of the terms mentioned in the description of the present application can be selected by the applicant in his or her judgment, and the detailed meanings of these terms can be obviously understood by those skilled in the art pertinent to the technical field of the present application. Furthermore, the present application should not be limited only by the actual terms used, but should be understood by the meanings of each term according to the descriptions made herein.

[0053] Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings. The detailed description of the present application will now be made with specific reference to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although the terms used in the present application are selected from generally known and used terms, some of the terms mentioned in the description of the present application can be selected by the applicant in his or her judgment, and the detailed meanings of these terms can be obviously understood by those skilled in the art pertinent to the technical field of the present application. Furthermore, the present application should not be limited only by the actual terms used, but should be understood by the meanings of each term according to the descriptions made herein. Figures 1 to 11 Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings. The detailed description of the present application will now be made with specific reference to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although the terms used in the present application are selected from generally known and used terms, some of the terms mentioned in the description of the present application can be selected by the applicant in his or her judgment, and the detailed meanings of these terms can be obviously understood by those skilled in the art pertinent to the technical field of the present application. Furthermore, the present application should not be limited only by the actual terms used, but should be understood by the meanings of each term according to the descriptions made herein.

[0054] Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings. The detailed description of the present application will now be made with specific reference to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although the terms used in the present application are selected from generally known and used terms, some of the terms mentioned in the description of the present application can be selected by the applicant in his or her judgment, and the detailed meanings of these terms can be obviously understood by those skilled in the art pertinent to the technical field of the present application. Furthermore, the present application should not be limited only by the actual terms used, but should be understood by the meanings of each term according to the descriptions made herein. Figures 1 to 3 Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings. The detailed description of the present application will now be made with specific reference to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although the terms used in the present application are selected from generally known and used terms, some of the terms mentioned in the description of the present application can be selected by the applicant in his or her judgment, and the detailed meanings of these terms can be obviously understood by those skilled in the art pertinent to the technical field of the present application. Furthermore, the present application should not be limited only by the actual terms used, but should be understood by the meanings of each term according to the descriptions made herein.

[0055] Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings. The detailed description of the present application will now be made with specific reference to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although the terms used in the present application are selected from generally known and used terms, some of the terms mentioned in the description of the present application can be selected by the applicant in his or her judgment, and the detailed meanings of these terms can be obviously understood by those skilled in the art pertinent to the technical field of the present application. Furthermore, the present application should not be limited only by the actual terms used, but should be understood by the meanings of each term according to the descriptions made herein.

[0056] It should be noted that the first conical wall 10 is provided with a protective shell 110, and the fuse bolt assembly 510 is arranged in the protective shell 110. Thus, when the fuse bolt assembly 510 is disconnected, the disconnected part near the first conical wall 10 is accommodated by the protective shell 110, and will not fly out and collide with the rotor components such as the fan blades, thereby reducing the serious impact of the fuse bolt assembly 510 after being disconnected on the rotor components such as the fan blades.

[0057] The protective shell 110 and the first conical wall 10 can be connected by bonding or welding, and the welding is preferred to improve the connection strength between the protective shell 110 and the first conical wall 10. In some other embodiments, the protective shell 110 and the first conical wall 10 can also be connected by bonding, which is not limited here.

[0058] In an embodiment, the intermediate casing frame 40 is provided with a hole for accommodating the other part of the fuse bolt assembly 510 after being disconnected. Thus, when the fuse bolt assembly 510 is disconnected, the two disconnected parts are collected by the hole on the intermediate casing side and the protective shell 110 arranged on the first conical wall 10, thereby avoiding the impact of the disconnected fuse bolt on the rotor blades and other components.

[0059] Please refer to Figures 4 to 6 In an embodiment, the second end of the first conical wall 10 is provided with at least two mounting plates 120 arranged at intervals, and the mounting gap 121 is formed between the adjacent mounting plates 120. The protective shell 110 is connected with the mounting plate 120, and the first connecting piece 310 passes through the mounting gap 121 to connect the second conical wall 30 and the intermediate casing.

[0060] The mounting process of the first conical wall 10, the second conical wall 30 and the intermediate casing frame 40 is as follows:

[0061] First, the first conical wall 10 and the second conical wall 30 are mounted by the fuse bolt assembly 510. After the mounting is completed, the second conical wall 30 and the intermediate casing frame 40 are mounted by the second connecting piece 520.

[0062] In an embodiment, the at least two mounting plates 120 are arranged uniformly and at intervals along the outer circumferential side of the first conical wall 10, thereby improving the connection stability of the connecting assembly 50 to the first conical wall 10 and the second conical wall 30.

[0063] Correspondingly, the at least two protective shells 110 are arranged uniformly and at intervals along the outer circumferential side of the first conical wall 10, and the at least two second connecting pieces 520 connect the second conical wall 30 and the intermediate casing frame 40 between the adjacent protective shells 110.

[0064] In one embodiment, the number of protective shells 110 is more than 3, and the plurality of protective shells 110 are evenly spaced around the outer circumferential side of the first conical wall 10. It should be noted that the more the number of corresponding protective shells 110, the higher the stability of the connection between the first conical wall 10 and the second conical wall 30 under the connecting effect of the connecting assembly 50.

[0065] In one embodiment, the fuse bolt assembly 510 includes a bolt body 511 and a bolt washer 512, the bolt washer 512 is located on the side of the first conical wall 10 away from the second conical wall 30, and the bolt body 511 is arranged in the bolt washer 512 and connected with the first conical wall 10 and the second conical wall 30. The middle of the bolt washer 512 is provided with a limiting hole 513, the hole wall of the limiting hole 513 is arc-shaped, and the bolt body 511 is provided with an arc-shaped boss 514 which is matched with the arc-shaped hole wall of the limiting hole 513.

[0066] The contact surface between the arc-shaped boss 514 and the arc-shaped hole wall is an arc surface, when the first conical wall 10 is deformed greatly under the action of the overturning moment (refer to the distance a in Figure 6 The arc surface between the bolt body 511 and the bolt washer 512 can still make the contraction section 515 (refer to below) of the bolt body 511 mainly bear the tensile force.

[0067] Further, the first conical wall 10 is provided with a first matching hole 130 matched with the fuse bolt assembly 510, the second conical wall 30 is provided with a second matching hole 320 matched with the fuse bolt assembly 510, the middle of the bolt body 511 is provided with a contraction section 515, and the bolt body 511 is further provided with a rotation-stopping boss 516. In the installed state, the contraction section 515 is located in the first matching hole 130, and the rotation-stopping boss 516 is located in the second matching hole 320.

[0068] That is, by arranging the rotation-stopping boss 516, the bolt body 511 only bears the axial thrust, and the torque transmitted by the mounting nut 518 (refer to below) only acts on the rotation-stopping boss 516, so that the contraction section 515 does not bear the torque of the nut during installation, and only needs to bear the axial load, thereby ensuring the accuracy of the design structure of the bolt body 511 and the reliability of the installation of the bolt body 511.

[0069] That is, by arranging the installation contact surface between the bolt body 511 and the bolt washer 512 as an arc surface, the contraction section 515 of the bolt body 511 can be ensured not to bear the bending moment, and under the action of the arc surface and the rotation-stopping boss 516, the contraction section 515 of the bolt body 511 only bears the tensile force, so that the accuracy of the calculation result and the structural reliability are increased during design.

[0070] In one embodiment, the fuse bolt assembly 510 further comprises an elastic bushing 517 sleeved outside the shrinkage section 515 and a mounting nut 518 arranged on the side of the second conical wall 30 away from the first conical wall 10 and threadedly connected with the bolt body 511.

[0071] The elastic bushing 517 arranged outside the shrinkage section 515 of the bolt body 511 can measure the relationship between the tightening torque and the pre-tightening force, so as to accurately control the pre-tightening force of the bolt body 511 and avoid the pre-tightening force dispersion from causing the bolt body 511 to be broken or not broken.

[0072] Please refer to Figures 7 to 8 In one embodiment, the connecting assembly 50 further comprises a second connecting member 520 arranged in the protection shell 110 and used for connecting the first conical wall 10 and the second conical wall 30. The second connecting member 520 comprises a connecting bolt 521, an elastic member 522 sleeved on the connecting bolt 521, the elastic member 522 being arranged on the side of the mounting plate 120 away from the second conical wall 30, and a connecting nut 523 arranged on the side of the second conical wall 30 away from the mounting plate 120 and threadedly connected with the connecting bolt 521.

[0073] The second connecting member 520 is arranged to continue to connect the first conical wall 10 and the second conical wall 30 after the fuse bolt assembly 510 is fused, so as to prevent the first conical wall 10 from moving forward and colliding with the fan blade.

[0074] It should be noted that the intermediate casing frame 40 is provided with three types of hole positions, the first type of hole position is used for accommodating the protruding part of the first connecting member 310, the second type of hole position is used for accommodating the protruding part of the fuse bolt assembly 510 and simultaneously used for collecting the fused part after the fuse bolt is fused, and the third type of hole position is used for accommodating the protruding part of the second connecting member 520.

[0075] Please refer to Figures 9 to 11 In one embodiment, the first conical wall 10 is further provided with an oil supply pipeline 140, one end of the oil supply pipeline 140 extending to the first bearing 20 and the other end extending to the intermediate casing frame 40. The length of the oil supply pipeline 140 is adjustable.

[0076] Specifically, the oil supply pipeline 140 is connected with the first conical wall 10 through a mounting bracket, and the oil supply pipeline 140 is provided with a corrugated section 141 on the side close to the intermediate casing frame 40.

[0077] The length-adjustable corrugated section 141 is arranged on the oil supply pipeline 140 outside the first conical wall 10, so that the oil supply pipeline 140 is not affected after the fuse bolt assembly 510 is fused, and can still maintain its integrity and functionality, and can continue to supply oil to the No. 1 bearing and the squeeze oil film damper.

[0078] Because the first conical wall 10 near the No. 1 bearing side does the circumferential swing movement (refer to Figure 9 ), the corrugated section 141 arranged on the oil supply pipeline 140 is beneficial to not affecting the normal oil supply of the oil supply pipeline 140 when the first conical wall 10 does the circumferential swing movement, and ensures the integrity and effectiveness of the oil supply pipeline 140 after the fuse bolt assembly 510 is fused, and ensures that the oil supply pipeline 140 can still supply oil to the No. 1 bearing and the squeeze oil film damper after the fuse bolt assembly 510 is fused.

[0079] Refer to Figure 10 In an embodiment, the second conical wall 30 is provided with a containing groove 330 towards the side of the first conical wall 10, the first conical wall 10 is sleeved in the containing groove 330 and connected with the second conical wall 30, and the outer circumferential part of the first conical wall 10 connected with the second conical wall 30 is provided in an arc shape.

[0080] That is, the outer circumferential surface of the first conical wall 10 is provided in an arc-shaped stop structure, in the initial installation state, the stop has the centering and positioning effect, after the fuse bolt assembly 510 is fused, the side of the first conical wall 10 near the No. 1 bearing has large displacement and does the circumferential swing movement, the side of the first conical wall 10 near the intermediate casing frame 40 is connected and limited by the second connecting piece 520, and the connecting surface of the first conical wall 10 and the second conical wall 30 is provided in an arc surface, so that the first conical wall 10 does not interfere with the second conical wall 30 and does not jam during the circumferential swing movement.

[0081] The application further provides an aero-engine comprising the intermediate casing frame 40, the first bearing 20 and the fuse structure for the necking bolt of the aero-engine, one end of the fuse structure for the necking bolt of the aero-engine is connected with the first bearing 20, and the other end is connected with the intermediate casing frame 40.

[0082] The application uses specific words to describe the embodiments of the application. As "one embodiment", "an embodiment", and / or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that the "one embodiment" or "one alternative embodiment" mentioned in different positions in the specification does not necessarily mean the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the application can be properly combined.

[0083] Although the present application is disclosed with reference to the preferred embodiments above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present application. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the technical solutions of the present application, all fall within the protection scope defined by the claims of the present application.

Claims

1. A fuse structure for a necked bolt of an aeroengine, characterized in that, The application relates to a connecting assembly for connecting a first cone wall and a second cone wall, and belongs to the technical field of connecting assemblies. The first cone wall is used for supporting a first bearing; The second cone wall is connected with an intermediate gearbox frame through a first connecting piece, and the other end of the first cone wall is connected with the other end of the second cone wall through the connecting assembly; the protection shell is arranged on the other end of the first cone wall, a cavity is formed between each protection shell and the first cone wall, and the connecting assembly is arranged in the cavity; wherein The connecting assembly comprises a fuse bolt assembly, and when the fuse bolt assembly is disconnected, the cavity is used for accommodating the disconnected part of the fuse bolt assembly close to the first cone wall; The other end of the first cone wall is provided with at least two spaced installation plates, an installation gap is formed between adjacent installation plates, the protection shell is connected with the installation plate, and the first connecting piece passes through the installation gap and is connected with the second cone wall and the intermediate gearbox frame; The fuse bolt assembly passes through the installation plate and is connected with the second cone wall; The connecting assembly further comprises a second connecting piece, the second connecting piece is arranged in the protection shell and is used for connecting the first cone wall and the second cone wall; The second connecting piece comprises a connecting bolt, an elastic piece and a connecting nut, and the elastic piece is sleeved on the connecting bolt; The elastic piece is arranged on the side, away from the second cone wall, of the installation plate, and the connecting nut is arranged on the side, away from the installation plate, of the second cone wall and is threadedly connected with the connecting bolt; A plurality of protection shells are uniformly arranged along the outer circumferential side of the first cone wall, and a plurality of second connecting pieces are arranged between adjacent protection shells and are used for connecting the second cone wall and the intermediate gearbox.

2. The fuse structure for a necked bolt of an aero-engine according to claim 1, characterized in that, The fuse bolt assembly comprises a bolt body and a bolt gasket; The bolt gasket is arranged on the side, away from the second cone wall, of the first cone wall, the bolt body passes through the bolt gasket and is connected with the first cone wall and the second cone wall; A limiting hole is formed in the middle of the bolt gasket, the hole wall of the limiting hole is arc-shaped, and an arc-shaped boss is arranged on the bolt body and is matched with the arc-shaped hole wall of the limiting hole.

3. The fuse structure for aero-engine necked bolt of claim 2, wherein, First matching holes matched with the fuse bolt are formed in the first cone wall, and second matching holes matched with the fuse bolt are formed in the second cone wall; The middle of the bolt body is provided with a contraction section, and a rotation-stopping boss is further arranged on the bolt body; in the installed state, the contraction section is arranged in the first matching hole, and the rotation-stopping boss is arranged in the second matching hole.

4. The fuse structure for aero-engine necked bolt of claim 3, wherein, The fuse bolt assembly further comprises an elastic bushing and a mounting nut, the elastic bushing is sleeved on the outer side of the contraction section, and the mounting nut is arranged on the side, away from the first cone wall, of the second cone wall and is threadedly connected with the bolt body.

5. The fuse structure for a necked bolt of an aeroengine according to any one of claims 1-4, characterized in that, An oil supply pipeline is further arranged on the outer side of the first cone wall, one end of the oil supply pipeline extends to the first bearing, and the other end of the oil supply pipeline extends to the intermediate gearbox frame. The length of the oil supply pipeline is adjustable.

6. The fuse structure for aero-engine necked bolt of claim 5, wherein, The oil supply pipeline is connected with the first conical wall through a mounting frame, and a corrugated section is arranged on the side of the oil supply pipeline close to the intermediate casing frame.

7. The fuse structure for a necked bolt of an aeroengine according to any one of claims 1-4, characterized in that, The second conical wall is provided with a receiving groove (330) on the side facing the first conical wall, and the first conical wall is sleeved in the receiving groove (330) and connected with the second conical wall. The outer periphery of the first conical wall connected with the second conical wall is arc-shaped.

8. An aeroengine characterised in that, Comprise: An intermediate casing frame; A first bearing; The fuse structure for the necking bolt of the aero-engine according to any one of claims 1-7, one end of the first conical wall is connected with the first bearing, and one end of the second conical wall is connected with the intermediate casing frame.

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