Aircraft engine accessory drive flange disassembly tool

Abstract

The utility model belongs to flange plate dismounting technical field, specifically disclose a kind of aircraft engine accessory drive device flange plate dismounting tool, including taper shaft and expansion sleeve, the taper shaft one end is the contact portion compatible with the inner wall of the expansion sleeve;The taper shaft one end passes through the expansion sleeve, and the contact portion is located the expansion sleeve inside, the other end of the taper shaft extends the expansion sleeve;Pull the taper shaft can make the contact portion extrude the expansion sleeve outward, and make the expansion sleeve radial expansion hold tightly flange plate inner hole;The detachable connection between the taper shaft and the expansion sleeve.The utility model can quickly dismount flange plate on accessory drive device, and avoid irreversible damage to flange plate and related parts.

Description

Technical Field

[0001] This utility model relates to the field of flange disassembly technology, specifically to a tool for disassembling the flange of an aircraft engine accessory transmission device. Background Technology

[0002] In the field maintenance of a certain type of turboshaft engine, the disassembly and inspection of the accessory transmission flange is a key step in ensuring the normal operation of the engine, but this process has long faced severe technical challenges. From the perspective of actual field operations, the installation location of the accessory drive unit on the aircraft is extremely unique, with severely limited space, which inherently hinders the disassembly of the flange. Further complicating matters is the tight-fitting design between the flange and the accessory drive unit. While this design ensures transmission stability and reliability, it significantly increases the difficulty of disassembly. Simultaneously, the flange itself is an irregular component, lacking regular stress points and operating surfaces, further exacerbating the complexity of disassembly. Under these conditions, maintenance personnel often have no choice but to resort to rough methods such as forcibly prying off the flange during field disassembly. Since it cannot be operated as it would be under normal engine disassembly conditions, this method is not only extremely difficult to perform but also poses a significant threat to components. Even slight carelessness can cause irreversible damage, resulting in wasted time and effort and severely impacting product quality. In a normal disassembly process, the steps themselves are quite cumbersome. According to regulations, the transmission housing return pump on the accessory drive unit must first be disassembled, and then the bottom of the flange should be tapped through the mounting hole of the removed transmission housing return pump using a copper rod or similar tool. However, when disassembling on an aircraft, due to the fixed engine position and space constraints, it is impossible to disassemble the accessory drive housing return pump mounted below the flange. This makes the normal disassembly process impossible, forcing the use of tools like flathead pryers to forcibly pry open the flange mounting surface to complete the disassembly. This method is not only inefficient but also causes irreversible damage to the flange and related components, is time-consuming and labor-intensive, and poses safety hazards for the subsequent use of the engine.

[0003] In the accessory drive system of a certain type of turboshaft engine, there are many gears connecting to accessories. These connections are guided by mounting bases and flanges, with the mounting base and flange integrally formed. The mounting base has an inner hole in the center, through which kinetic energy is transmitted to various accessories, including the air starter, fuel regulator, centrifugal fuel pump, and sensors, via gear meshing. There are specific clearance and sealing requirements between the gears and accessory drive systems. Therefore, during engine operation, sealing problems or suboptimal gear performance may occur. Consequently, even before the engine reaches its service life, individual component inspection or replacement may be necessary. This necessitates the use of special tools on the aircraft to disassemble components to ensure the aircraft's normal flight operation. Utility Model Content

[0004] This utility model provides a flange removal tool for an aircraft engine accessory transmission device, which aims to quickly remove the flange on the accessory transmission device and avoid irreversible damage to the flange and related components.

[0005] This utility model is achieved through the following technical solution: a flange disassembly tool for an aircraft engine accessory transmission device, comprising a tapered shaft and an expansion sleeve, one end of the tapered shaft being a contact portion adapted to the inner wall of the expansion sleeve; one end of the tapered shaft passing through the expansion sleeve, and the contact portion being located inside the expansion sleeve, and the other end of the tapered shaft extending out of the expansion sleeve; Pulling the tapered shaft causes the contact portion to press the expansion sleeve outward, thereby causing the expansion sleeve to expand radially and clamp the inner hole of the flange; the tapered shaft and the expansion sleeve are detachably connected.

[0006] Compared with existing technologies, this solution has the following advantages and beneficial effects: The disassembly tool in this solution utilizes the synergistic action of a tapered shaft and an expansion sleeve, eliminating the cumbersome preliminary steps required in traditional disassembly, such as disassembling the transmission housing and return oil pump. During operation, simply insert the expansion sleeve into the flange's inner bore, tighten the flange's inner bore through the contact portion at the end of the tapered shaft, then fix the expansion sleeve to the tapered shaft, and finally pull the tapered shaft to complete the disassembly. The entire process involves fewer steps and has a clear logic, allowing for efficient operation by a single person, significantly reducing the operation time within the confined space of an aircraft, and achieving rapid separation of the flange. Furthermore, in this design, after the expansion sleeve fully fits into the inner bore of the flange, radial expansion is achieved through the compression of the tapered shaft contact portion. This expansion results in a clamping force that is evenly distributed across the inner surface of the flange, avoiding the problem of excessive localized force in traditional prying methods. Simultaneously, the fitting structure between the tapered shaft and the expansion sleeve ensures smooth force transmission, preventing irreversible damage such as bumps, scratches, or deformation to the flange and surrounding components (e.g., mounting bases, gear connections), effectively protecting the precision and integrity of the components. The detachable connection design of the tapered shaft and the expansion sleeve makes the assembly, disassembly, and installation of tools on the flange more flexible and convenient. Furthermore, the expansion sleeve can be tightened around the flange's inner bore simply by pulling the tapered shaft, making the operation simple and intuitive, allowing a single person to complete the task. Compared to the traditional, cumbersome disassembly steps, this significantly reduces flange disassembly time and improves the efficiency of field maintenance. Furthermore, the fitting structure between the contact part and the inner wall of the expansion sleeve ensures that the contact part can stably compress the expansion sleeve when the tapered shaft is pulled, making the expansion sleeve fit tightly against the inner hole of the flange and forming a firm connection. This reliable connection method avoids slippage or loosening between the tool and the flange during disassembly, providing a stable force base for smooth flange disassembly and reducing operational errors and safety hazards caused by unstable connections. Finally, the structural design of this disassembly tool is adapted to the size characteristics of the flange of the aircraft engine accessory transmission device, making it particularly suitable for the space-constrained operating environment on aircraft. Its lightweight structure and simple operation can well meet the special needs of field maintenance. At the same time, the detachable connection method also facilitates the carrying, storage and maintenance of the tool, enhancing its practical value.

[0007] Furthermore, the inner wall of the expansion sleeve has a taper, and the contact portion has a tapered shape of a rotating body, the taper of the contact portion being adapted to the taper of the inner wall of the expansion sleeve.

[0008] Beneficial effects: The tapered fit design between the contact part and the inner wall of the expansion sleeve efficiently converts the axial tensile force of the tapered shaft into the radial expansion force of the expansion sleeve, and the force transmission path is stable. Due to the full fit of the tapered surface, the compressive force on the expansion sleeve is evenly distributed along the circumferential direction, avoiding the problems of expansion sleeve deformation or uneven force on the inner hole of the flange caused by local stress concentration, and ensuring that the expansion sleeve clamps the inner hole of the flange with a balanced force.

[0009] Furthermore, the expansion sleeve includes an expansion sleeve body, a positioning plate, and an expansion sleeve shaft connected coaxially in sequence. The expansion sleeve body has elastic deformation properties, and the inner wall of the expansion sleeve body is a tapered surface with a taper. The outer diameter of the positioning plate is larger than the inner diameter of the flange. The expansion sleeve shaft is coaxially and detachably connected to the tapered shaft.

[0010] Beneficial effects: The outer diameter of the positioning plate is larger than the inner diameter of the flange. After the expansion sleeve is inserted into the flange's inner hole, the positioning plate can directly abut against the flange end face, forming an axial limit. This design can precisely control the insertion depth of the expansion sleeve into the flange's inner hole, avoiding interference or collision with other internal components (such as gears and seals) due to improper operation, effectively protecting the integrity of the flange and surrounding accessories. The limiting function of the positioning plate reduces the "blind adjustment" step during operation. Operators do not need to repeatedly confirm the position of the expansion sleeve; they can directly judge whether the installation is in place by the fit of the positioning plate, shortening preparation time. The expansion sleeve body possesses independent elastic deformation capability, and its inner wall is a tapered surface that matches the taper of the contact part with the tapered shaft. When the tapered shaft is pulled, the expansion sleeve body can independently expand radially under the compression of the tapered surface, ensuring a tight fit with the inner hole of the flange; while the positioning plate and the expansion sleeve shaft do not participate in the deformation, which not only ensures the flexibility of the expansion sleeve body's deformation, but also transmits the operating force through a rigid structure (positioning plate, expansion sleeve shaft), avoiding force transmission loss caused by the overall deformation of the expansion sleeve, and improving the clamping reliability of the flange.

[0011] The expansion sleeve shaft and tapered shaft are coaxially and detachably connected (e.g., threaded connection, pin connection), allowing the tool to flexibly connect the two according to the flange inner hole depth and operating space size. Each disassembled component can be stored individually, reducing the overall tool size and facilitating field transport and storage. Furthermore, the modular structure allows for the individual replacement of vulnerable components of the expansion sleeve (such as the elastically deformable expansion sleeve body) without requiring complete scrapping, reducing tool maintenance costs. Simultaneously, the coaxial design of the positioning plate and expansion sleeve body ensures concentricity during expansion, preventing excessive localized stress on the flange inner hole due to eccentricity, further extending the service life of the flange and disassembly tools.

[0012] Furthermore, the expansion sleeve shaft has symmetrical expansion sleeve pin holes on both sides, and the lower part of the tapered shaft has a through groove along its axial direction. The through groove passes through both sides of the tapered shaft and is in the shape of an elongated hole. The expansion sleeve shaft and the tapered shaft can be detachably connected by inserting a cylindrical pin into the expansion sleeve pin hole and the through groove.

[0013] Beneficial effects: First, it improves the ease of connection and disassembly. The insertion and removal of the cylindrical pin is simple, requiring no complex tools or cumbersome steps, enabling rapid assembly and disassembly of the expansion sleeve shaft and the tapered shaft. In the space-constrained field operation environment of aircraft, this convenient connection method can significantly reduce operation time, improve the overall efficiency of flange disassembly, and meet the needs of rapid maintenance. Secondly, it ensures the reliability and stability of the connection. The symmetrical expansion sleeve pin holes on both sides of the expansion sleeve shaft fit with the through groove of the tapered shaft, and with the positioning effect of the cylindrical pin, it can effectively limit the relative rotation and radial displacement between the expansion sleeve shaft and the tapered shaft, so that the two maintain coaxiality during the stress process, ensuring that the axial force of the tapered shaft can be stably transmitted to the expansion sleeve, ensuring that the expansion sleeve expands evenly and tightens the inner hole of the flange, and avoiding uneven stress or operational errors caused by loose connection. Furthermore, it possesses a certain degree of adjustability to adapt to different working conditions. The through groove on the tapered shaft is shaped like an elongated hole, allowing the expansion sleeve shaft and the tapered shaft to move relative to each other axially within a certain range after the cylindrical pin is inserted. This adjustability can accommodate flange bores with different inner diameters. When it is necessary to change the axial position of the contact part on the tapered shaft and the expansion sleeve by pulling the tapered shaft, so that the contact part squeezes the expansion sleeve to expand and make tight contact with the flange bore, the axial position of the contact part inside the expansion sleeve will be different for flange bores with different inner diameters. If the shape of the through groove and the expansion sleeve pin hole are both round holes, the position of the contact part inside the expansion sleeve may not be completely aligned and coincide, making it impossible to smoothly insert the cylindrical pin for limiting and fixing. However, the elongated through groove can adapt to the different positions of the contact part inside the expansion sleeve, and the positional accuracy requirements of the through groove and the expansion sleeve pin hole are lower. The two do not need to be completely aligned, and the cylindrical pin can be quickly inserted to connect the expansion sleeve shaft and the tapered shaft. In other words, it can adapt to assembly errors by fine adjustment in the disassembly operation of flanges of different sizes, improving the versatility and applicability of the tool. Finally, it helps protect components and reduce damage. Compared to threaded connections, cylindrical pin connections transmit force more smoothly, and the elongated perforated groove design buffers some of the impact force, reducing wear and impact damage to the connection between the expansion sleeve shaft and the tapered shaft. Furthermore, removing the cylindrical pin during disassembly will not damage the connection structure of the expansion sleeve shaft and the tapered shaft, extending the tool's lifespan.

[0014] Furthermore, the expansion sleeve body has multiple elastic grooves extending through its inner and outer walls along its circumference, with one end of each elastic groove extending through the end of the expansion sleeve body away from the positioning plate.

[0015] Beneficial effects: The elastic groove in this design provides deformation space for the expansion sleeve. When the contact part presses against the inner wall of the expansion sleeve, the expansion sleeve can smoothly expand radially along the elastic groove, avoiding difficulty in deformation due to excessive overall rigidity. This flexible expansion characteristic ensures that the expansion sleeve can quickly and evenly conform to the inner hole of the flange, improving the efficiency and reliability of clamping the flange. Especially when dealing with tight-fitting flanges, it can more easily achieve an effective connection.

[0016] Because the elastic grooves make the expansion sleeve more buffered during expansion, the force exerted on the flange's inner bore can be transmitted more smoothly, avoiding sudden excessive stress in certain areas. At the same time, multiple evenly distributed elastic grooves make the expansion force of the expansion sleeve more uniform along the circumference, reducing the risk of scratches, deformation, and other damage to the flange's inner bore due to uneven stress, further ensuring the integrity of the flange. The elastic groove provides the expansion sleeve with a certain expansion adjustment margin. For flange inner holes with slight size differences, the expansion sleeve can achieve a good fit through the deformation adjustment of the elastic groove, eliminating the need to frequently replace expansion sleeves of different specifications. This expands the tool's applicability and enhances its versatility, making it especially suitable for scenarios involving flanges of various specifications in field maintenance. Once disassembly is complete and the pressure from the contact points on the expansion sleeve disappears, the elastic restoring force of the elastic groove causes the expansion sleeve to quickly contract and reset, returning to its initial state. This excellent reset performance ensures that the expansion sleeve can be reused multiple times, extending the tool's lifespan and reducing maintenance costs.

[0017] Furthermore, the outer side of the expansion sleeve shaft is provided with anti-slip mesh.

[0018] Beneficial effects: The anti-slip texture increases the friction between the hand and the expansion sleeve shaft when connecting or disassembling it with other components. This effectively prevents hand slippage, ensures that the operator can stably control the expansion sleeve shaft during force application, reduces operational errors caused by unstable grip, and improves the accuracy of the operation.

[0019] Furthermore, it also includes a nut, which is located above the expansion sleeve and is threaded to the tapered shaft. Tightening the nut can compress the expansion sleeve.

[0020] Beneficial effects: The nut in this design allows the expansion sleeve to be fully fitted into the flange's inner bore. Tightening the nut with a wrench expands the sleeve and then secures it. After the expansion sleeve is in contact with the inner bore, the axial force generated by tightening the nut further promotes radial expansion, creating a tight and stable connection between the outer wall of the expansion sleeve and the flange's inner bore. This locking effect effectively prevents relative slippage between the expansion sleeve and the flange during subsequent flange disassembly, providing a reliable foundation for smooth disassembly and ensuring that both maintain synchronized movement.

[0021] Furthermore, a handle is connected to one end of the tapered shaft that extends out of the expansion sleeve.

[0022] Beneficial effects: The handle provides operators with an easy-to-grip point for applying force, making it easier to control the pulling action of the conical shaft compared to directly gripping the smooth conical shaft. Especially in the space-constrained environment of an aircraft, the handle can adapt to different grip postures, reducing hand fatigue during operation and enabling operators to more efficiently complete the action of pulling the conical shaft to cause the expansion sleeve to expand, thus reducing the intensity of work.

[0023] Furthermore, it also includes a swing hammer, which is slidably coaxial with the conical shaft. Sliding the swing hammer allows one end of the swing hammer to abut against one end of the handle.

[0024] Beneficial effects: In this design, as the hammer slides along the conical shaft, it accumulates kinetic energy through reciprocating motion. Upon contact with the handle, this kinetic energy is converted into an axial impact force on the conical shaft. Compared to simply manually pulling the conical shaft, this impact method generates greater axial force with less manual effort. It is particularly suitable for situations where the flange and accessory transmission device are tightly connected, easily overcoming static friction, quickly separating the flange, significantly reducing operator fatigue, and improving disassembly efficiency.

[0025] The sliding stroke of the hammer is limited by the conical shaft and the contact position with the handle is fixed. The operator can adjust the impact force by controlling the sliding amplitude of the hammer to adapt to flange connections with different tightness.

[0026] In the confined space of an aircraft, the sliding impact design of the hammer requires no additional tools; a single person can complete the impact action by sliding it back and forth. The contact structure with the handle ensures safety during the impact process, preventing the hammer from slipping or shifting the impact position. This allows operators to efficiently complete disassembly operations even in confined spaces, perfectly aligning with the tool's overall lightweight and easy-to-operate design. Furthermore, at least one groove is formed on the outer circumferential surface of the hammer, and the groove surrounds the outer circumferential surface of the hammer.

[0027] Beneficial effects: The grooves in this design provide a supportive grip for the operator's hand, especially when rapid reciprocating motion is required. The groove design improves the contact area between the hand and the outer circumference of the hammer, reducing hand slippage. Simultaneously, the grooves distribute pressure on the hand, preventing localized pressure during prolonged use, improving operational comfort, and allowing the operator to more stably control the amplitude and frequency of the hammer's movement. Secondly, it enhances anti-slip performance to adapt to complex working conditions. In outdoor working environments, operators' hands may slip due to factors such as sweat, oil contamination, or coolant on the tool surface. The circumferential groove increases the friction between the hand and the hammer, effectively resisting the effects of these adverse factors. This ensures that the hand and hammer maintain reliable contact during impact operations, preventing loss of control of impact force or interruption of operation due to hammer slippage, and further ensuring operational safety. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of an embodiment of the flange disassembly tool for an aircraft engine accessory transmission device according to the present invention; Figure 2This is a longitudinal cross-sectional view of an embodiment of the flange disassembly tool for an aircraft engine accessory transmission device according to the present invention; Figure 3 This is a schematic diagram of the tapered shaft in an embodiment of the aircraft engine accessory transmission device flange disassembly tool of this utility model; Figure 4 This is a schematic diagram of the expansion sleeve in an embodiment of the aircraft engine accessory transmission device flange disassembly tool of this utility model; Figure 5 This is a front view of the expansion sleeve in an embodiment of the aircraft engine accessory transmission device flange disassembly tool of this utility model; Figure 6 for Figure 5 Sectional view at point CC.

[0029] The attached diagram shows the markings and corresponding component names: Flange 1, Mounting base 2; Disassembly tool 3, handle 31; Tapered shaft 32, tapered shaft pin hole 321, through groove 322, contact part 323; 33 swing hammer, 331 groove, 34 high nut; Expansion sleeve 35, anti-slip mesh 351, expansion sleeve pin hole 352, expansion sleeve body 353, positioning plate 354, expansion sleeve shaft 355, conical surface 356, elastic groove 357, slot hole 358; cylindrical pin 4. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0031] As one embodiment of this application, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a disassembly tool 3 for an aircraft engine accessory transmission device flange 1, including a tapered shaft 32 and an expansion sleeve 35. One end of the tapered shaft 32 is a contact portion 323 that is adapted to the inner wall of the expansion sleeve 35. One end of the tapered shaft 32 passes through the expansion sleeve 35, and the contact portion 323 is located inside the expansion sleeve 35. The other end of the tapered shaft 32 extends out of the expansion sleeve 35. Pulling the tapered shaft 32 causes the contact portion 323 to press the expansion sleeve 35 outward, causing the expansion sleeve 35 to expand radially and tighten around the inner hole of the flange 1; the tapered shaft 32 and the expansion sleeve 35 are detachably connected. In this embodiment, the flange 1 has an integrally formed mounting seat 2 at its end, which is also part of the flange 1, and the inner hole of the flange 1 is located inside the mounting seat 2 of the flange 1.

[0032] In one embodiment, combined Figure 5 and Figure 6 As shown, the inner wall of the expansion sleeve 35 has a taper, which, combined with... Figure 3 As shown, in this embodiment, the contact portion 323 at the end of the tapered shaft 32 has a tapered shape of revolution, such as a frustum or a cone. In this embodiment, the contact portion 323 is frustum shaped. Figure 2 As shown, the taper of the contact portion 323 matches the taper of the inner wall of the expansion sleeve 35, such as... Figure 6 As shown, the expansion sleeve 35 in this embodiment is hollow inside, and the expansion sleeve 35 is provided with a tapered cavity that matches the taper of the contact portion 323.

[0033] In another embodiment, the contact portion 323 is a wedge with an inclined plane, and multiple wedges can be provided. The multiple wedges are distributed circumferentially along the conical shaft 32, which enables the expansion sleeve 35 to be evenly stressed and avoids local stress concentration. When the conical shaft 32 is pulled, the inclined surface of the wedge can contact the inner wall of the expansion sleeve 35 and apply radial compressive force, causing the expansion sleeve 35 to expand radially.

[0034] In one embodiment, such as Figure 4 , Figure 5 and Figure 6 As shown, the expansion sleeve 35 includes an expansion sleeve body 353, a positioning plate 354, and an expansion sleeve shaft 355 connected coaxially in sequence. The expansion sleeve body 353 has elastic deformation properties. In this embodiment, the material of the expansion sleeve body 353 can be spring steel (such as 65Mn, 50CrVA) or elastic alloy (such as nickel-titanium alloy). In this embodiment, the expansion sleeve body 353 is welded and fixed to the positioning plate 354, and the positioning plate 354 is welded and fixed to the expansion sleeve shaft 355 or integrally formed. The expansion sleeve shaft 355 and the positioning plate 354 are coaxially provided with a through hole for the tapered shaft 32 to pass through. The interior of the expansion sleeve body 353 is a cavity corresponding to the through hole.

[0035] like Figure 6 As shown, the inner wall of the expansion sleeve 353 is a tapered surface 356, and the outer diameter of the positioning plate 354 is larger than the inner diameter of the flange 1; the expansion sleeve shaft 355 is coaxially and detachably connected to the tapered shaft 32. Specifically, expansion sleeve pin holes 352 are symmetrically opened on both sides of the expansion sleeve shaft 355, combined with... Figure 2 and Figure 3 As shown, a through groove 322 is provided along the axial direction at the lower part of the tapered shaft 32, and the through groove 322 extends through both sides of the tapered shaft 32, as shown. Figure 3 As shown, the through groove 322 is in the shape of an elongated hole, combined with Figure 2 As shown, the expansion sleeve shaft 355 and the tapered shaft 32 are detachably connected by inserting a cylindrical pin 4 into the expansion sleeve pin hole 352 and the through groove 322.

[0036] In one embodiment, such as Figure 4 and Figure 5 As shown, the expansion sleeve 353 has multiple elastic grooves 357 extending through its inner and outer walls along its circumference. One end of each elastic groove 357 extends through the end of the expansion sleeve 353 away from the positioning plate 354, and the other end of each elastic groove 357 has a circular slot 358 communicating with it. When the expansion sleeve 353 expands or contracts, the end of the elastic groove 357 is a region where stress easily accumulates. If the end of the elastic groove 357 is a right angle or a sharp angle, it is easy to generate cracks due to stress concentration during repeated deformation, which will lead to damage to the expansion sleeve 353. In this embodiment, the arc-shaped structure of the circular slot 358 can evenly distribute the stress along the circumferential direction, avoid excessive local stress, and significantly improve the structural stability of the expansion sleeve 353.

[0037] In one embodiment, such as Figure 5 As shown, the outer side of the expansion sleeve shaft 355 is provided with anti-slip texture 351. This prevents hand slippage during assembly and disassembly, making operation more convenient.

[0038] In one embodiment, combined Figure 1 and Figure 2 As shown, the disassembly tool 3 for the flange 1 of an aircraft engine accessory transmission device in this embodiment also includes a nut. The nut is located above the expansion sleeve 35 and is threadedly connected to the tapered shaft 32. Tightening the nut can press the expansion sleeve 35. The nut in this embodiment is a high nut 34, which is higher than that of a regular nut of the same specification and has a longer thread length, which can enhance the fit with the connected parts.

[0039] In one embodiment, such as Figure 1 and Figure 2 As shown, a handle 31 is connected to one end of the tapered shaft 32 extending from the expansion sleeve 35. In this embodiment, the handle 31 and the tapered shaft 32 are detachably connected, specifically as follows: Figure 3 As shown, a tapered shaft pin hole 321 is provided on the upper part of the tapered shaft 32 near its top, and a pin hole that mates with the tapered shaft pin hole 321 is provided on the lower part of the handle 31. Figure 2 As shown, the handle 31 is fixed to the tapered shaft 32 by inserting a cylindrical pin 4 into the pin hole 321 of the handle 31 and the pin hole 321 of the tapered shaft. In this design, the handle 31, tapered shaft 32, and expansion sleeve 35 are all detachably connected, which facilitates disassembly and installation. The detachable design allows the tool to be disassembled into independent components such as the handle 31, tapered shaft 32, and expansion sleeve 35, significantly reducing the overall size and space occupied. Operators can neatly store the disassembled components in a toolbox, making it easy to carry and transport, especially suitable for transportation environments with limited space in field operations.

[0040] In addition, during long-term use, certain parts of the tool may require repair or replacement due to wear, deformation, or other issues. For example, if the elasticity of the expansion sleeve 35 decreases due to repeated expansion and contraction, or if the gripping part of the handle 31 is worn and affects operation, the detachable connection allows for the individual removal of the damaged part without replacing the entire tool set. This reduces maintenance costs, shortens the repair cycle, and ensures that the tool can be quickly restored to usable condition.

[0041] In one embodiment, a disassembly tool 3 for a flange 1 of an aircraft engine accessory transmission device further includes a swing hammer 33, which is coaxially and slidably fitted with a conical shaft 32. In this embodiment, the swing hammer 33 and the conical shaft 32 are fitted with a clearance. By sliding the swing hammer 33, one end of the swing hammer 33 can be made to abut against one end of the handle 31.

[0042] In one embodiment, at least one groove 331 is formed on the outer circumferential surface of the hammer 33, and the groove 331 surrounds the outer circumferential surface of the hammer 33. In this embodiment, two grooves 331 are formed on the outer circumferential surface of the hammer 33, arranged one above the other, and both grooves 331 are semi-circular arc grooves 331. The arc structure of the semi-circular arc groove 331 is highly adapted to the natural curvature of human fingers. When the operator holds the hammer 33, the fingers can naturally embed into the groove 331, forming a closer fit. This fit not only disperses hand pressure and reduces fingertip fatigue caused by prolonged operation, but also makes the grip more stable. Especially when rapidly sliding the hammer 33 back and forth, it can reduce the relative friction between the hand and the surface of the hammer 33, improving the comfort of operation.

[0043] In practical use, the main workflow of the decomposition process is as follows: Assemble the tool assembly: Detachably connect the tapered shaft 32 to the expansion sleeve 35, ensuring that the contact portion 323 (a tapered rotating body) of the tapered shaft 32 and the inner wall of the expansion sleeve 353 (a structure with an elastic groove 357) are precisely tapered; put the high nut 34 on the threaded section of the tapered shaft 32 above the expansion sleeve 35, put the swing hammer 33 on the tapered shaft 32, so that it maintains a coaxial sliding fit with the tapered shaft 32, and then install the handle 31 on the end of the tapered shaft 32 that extends out of the expansion sleeve 35 to complete the assembly of the tool body.

[0044] Place and position the expansion sleeve 35: Place the tooling expansion sleeve 35 into the inner hole of the flange 1, so that the expansion sleeve body 353 is completely attached to the inner hole of the flange 1. At this time, the positioning plate 354 of the expansion sleeve 35, because its outer diameter is larger than the inner hole diameter of the flange 1, can play an axial limiting role and prevent the expansion sleeve 35 from going too deep.

[0045] Fixed expansion sleeve 35 and flange 1: Upward ( Figure 2(In the indicated direction) Pull the tapered shaft 32, causing the contact portion 323 of the tapered shaft 32 to gradually press against the inner wall of the expansion sleeve 353, causing the expansion sleeve 353 to expand radially along the circumferential elastic groove 357 until the outer wall of the expansion sleeve 35 is tightly fitted and fixed to the inner hole of the flange 1, forming a reliable connection. Then, tighten the high nut 34 with a wrench to press it firmly against the expansion sleeve 35.

[0046] Prepare for impact operation: Hold the semi-circular groove 331 on the outer circumference of the hammer 33.

[0047] Impact disassembly: The operator holds the handle 31 with one hand to stabilize the overall position of the tool, and swings the hammer 33 up and down along the tapered shaft 32 with the other hand. When the hammer 33 slides upward to abut one end of the handle 31, the axial impact force generated is transmitted through the handle 31 to the tapered shaft 32, further pulling the contact part 323 to squeeze the expansion sleeve 353, enhancing the clamping force between the expansion sleeve 35 and the inner hole of the flange 1; then the hammer 33 slides downward, using inertia to generate another impact. Through repeated up and down swinging, the impact force gradually separates the flange 1 from the accessory transmission device, ultimately achieving the goal of quickly and easily disassembling the flange 1 by one worker.

[0048] Disassembly tool 3: After disassembling flange 1, loosen the high nut 34, push the tapered shaft 32 downward, so that the contact part 323 at the bottom of the tapered shaft 32 loosens the expansion sleeve 353. Under the restoring action of the elastic groove 357, the expansion sleeve 353 radially contracts and disengages from the inner hole of flange 1. Then, remove the high nut 34, the swing hammer 33, the handle 31 and the expansion sleeve 35 in sequence to complete the disassembly and storage of the tool.

[0049] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An aircraft engine accessory drive flange disassembly tool characterized by, It includes a tapered shaft and an expansion sleeve. One end of the tapered shaft is a contact portion adapted to the inner wall of the expansion sleeve. One end of the tapered shaft passes through the expansion sleeve, and the contact portion is located inside the expansion sleeve. The other end of the tapered shaft extends out of the expansion sleeve. Pulling the tapered shaft causes the contact portion to press the expansion sleeve outward, thereby causing the expansion sleeve to expand radially and tightly grip the inner hole of the flange; The tapered shaft and the expansion sleeve are detachably connected.

2. An aircraft engine accessory drive flange removal tool as claimed in claim 1, wherein, The inner wall of the expansion sleeve has a taper, and the contact portion has a tapered shape of a rotating body, the taper of the contact portion being adapted to the taper of the inner wall of the expansion sleeve.

3. An aircraft engine accessory drive flange removal tool as claimed in claim 2, wherein, The expansion sleeve includes an expansion sleeve body, a positioning plate, and an expansion sleeve shaft connected coaxially in sequence. The expansion sleeve body has elastic deformation properties, and the inner wall of the expansion sleeve body is a tapered surface with a taper. The outer diameter of the positioning plate is larger than the inner diameter of the flange. The expansion sleeve shaft is coaxially and detachably connected to the tapered shaft.

4. An aircraft engine accessory drive flange removal tool as claimed in claim 3, wherein, The expansion sleeve shaft has symmetrical expansion sleeve pin holes on both sides, and the lower part of the tapered shaft has a through groove along its axial direction. The through groove runs through both sides of the tapered shaft and is in the shape of an elongated hole. The expansion sleeve shaft and the tapered shaft can be detachably connected by inserting a cylindrical pin into the expansion sleeve pin hole and the through groove.

5. An aircraft engine accessory drive flange removal tool as claimed in claim 3, wherein, The expansion sleeve has multiple elastic grooves extending through its inner and outer walls along its circumference, with one end of each elastic groove extending through the end of the expansion sleeve away from the positioning plate.

6. An aircraft engine accessory drive flange removal tool as claimed in claim 3, wherein, The outer side of the expansion sleeve shaft is provided with anti-slip mesh.

7. An aircraft engine accessory drive flange removal tool according to any one of claims 1-6, characterized in that, It also includes a nut, which is located above the expansion sleeve and is threaded to the tapered shaft. Tightening the nut can compress the expansion sleeve.

8. An aircraft engine accessory drive flange removal tool according to any one of claims 1-6, wherein, A handle is connected to one end of the tapered shaft that extends from the expansion sleeve.

9. An aircraft engine accessory drive flange removal tool as claimed in claim 8, wherein, It also includes a swing hammer, which is slidably coaxial with the conical shaft. Sliding the swing hammer allows one end of the swing hammer to abut against one end of the handle.

10. An aircraft engine accessory drive flange removal tool as defined in claim 9, wherein, At least one groove is formed on the outer circumferential surface of the hammer, and the groove surrounds the outer circumferential surface of the hammer.

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