Aeroengine fan rotor journal disassembly tooling and disassembly method

Abstract

The present invention discloses a disassembly tooling and a disassembly method for an aeroengine fan rotor journal. The tooling mainly consists of a support shaft, an adapter seat, a fixed handle, a push rod, a rotating handle and a lifting ring. During disassembly, the support shaft is placed in the inner cavity of the fan rotor through the extraction ring on the support shaft, and the guide shaft contacts and stops with the low-vortex shaft; the fixed handle is rotated counterclockwise to connect the adapter seat with the threaded hole of the front shaft of the fan rotor; the rotating handle rotates the push rod counterclockwise, so that the second external thread on the outer surface of the push rod interacts with the internal thread of the first through hole on the adapter seat, and the front end of the push rod presses the support seat on the support shaft. Then, the adapter seat drives the fan rotor to move towards the lifting ring end until the fan rotor disengages from the interference fit section; a crane is used to lift the fan rotor through the lifting ring to complete the disassembly work. The tooling of the present invention is simple, and the disassembly process is stable, fast, efficient and safe.

Description

Technical Field

[0001] The present invention belongs to the technical field of aero-engine overall assembly and commissioning, and specifically relates to a tooling and a disassembly method for interference fitting and disassembly of the journal of an aero-engine fan rotor. Background Art

[0002] The journal of the aero-engine fan rotor ( Figure 8 the fan rotor journal 10 in Figure 8 is in an interference fit with the adapter shaft of the bearing housing ( Figure 8 the adapter shaft 9 in Figure 8 ), and the interference fit is realized by the temperature difference method during assembly. The other end of the adapter shaft of the bearing housing is connected to the low-pressure turbine shaft ( Figure 8 the low-pressure turbine shaft 7 in Figure 8 ), and a spline bushing ( Figure 8 the spline bushing 8 in

[0003] is arranged on the low-pressure turbine shaft. There is a threaded hole at the front shaft end of the fan rotor.

[0003] Generally, the tightness between the journals of the fan rotor becomes more serious after the engine operates, so it is very difficult to loosen the fan rotor from the main engine during engine disassembly. At present, the interference disassembly of the fan rotor journal only relies on a sling cooperating with a crane to lift it out. During the process, several times of additional loads are required to achieve the disassembly of the fan rotor. Sometimes, due to the long working time and too large interference amount, it cannot be disassembled by conventional means, and there are certain quality risks and safety hazards. On the other hand, because the fan rotor is relatively large in volume, if designed according to the general disassembly tool design scheme, axial stopping needs to be carried out by means of the fan stator mounting flange. The tooling of this scheme is huge in volume, inconvenient to install, and at the same time, there are quality hazards such as being easily knocked and damaged. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention aims to provide a tooling and a disassembly method for the journal of an aero-engine fan rotor. Combining the structural characteristics of the cooperation between the journal of the engine fan rotor and the internal thread structure of the front shaft of the fan rotor, and using the threaded structure on the tooling, the fan rotor can be stably, quickly, efficiently and safely disassembled from the main engine, and the disassembly tooling is light and simple to install.

[0005] The present invention adopts the following technical solutions:

[0006] A tooling for disassembling the journal of an aero-engine fan rotor, comprising:

[0007] A support shaft, the support shaft includes a long shaft, a support seat, a centering sleeve, an extraction ring and a guide shaft. Among them, the long shaft is a hollow circular tube. A support seat for blocking the first end opening is fixedly connected to the first axial end of the long shaft. An extraction ring is connected to the circumferential outer surface of the support seat. A centering sleeve is arranged on the circumferential outer surface of the long shaft. The outer diameter of the centering sleeve forms a fit with the inner diameter of the fan rotor. A guide shaft is fixedly connected to the second axial end of the long shaft. The outer diameter of the guide shaft forms a fit with the inner diameter of the spline bushing;

[0008] Adapter, the adapter includes a coaxial first cylindrical surface, a second cylindrical surface and a first through hole. The outer diameter of the first cylindrical surface is smaller than that of the second cylindrical surface. Internal threads are machined on the inner wall of the first through hole. A second through hole perpendicular to and communicating with the first through hole is opened on the first cylindrical surface. External threads are machined on the outer surface of the second cylindrical surface, and the external threads are used to connect with the internal threads of the front shaft of the fan rotor;

[0009] Fixing handle, one end of the fixing handle is inserted into the second through hole;

[0010] Ejector rod, the ejector rod includes a head and a rod portion that are coaxial and have different outer diameters. A first threaded hole and a second threaded hole perpendicular to each other are machined on the head. External threads matching the internal threads on the inner wall of the first through hole are machined on the outer surface of the rod portion;

[0011] Rotating handle, one end of the rotating handle is threadedly connected to the second threaded hole;

[0012] Lifting ring, the lifting ring is threadedly connected to the first threaded hole.

[0013] Furthermore, a part of the support seat is inserted into the long shaft, and the other part is located outside the long shaft. A positioning ring is provided on the end face located outside the long shaft, and an extraction ring is connected to the outer circumferential surface of the positioning ring. When the ejector rod is inserted, the positioning ring on the front end face of the support seat plays a centering role for the ejector rod.

[0014] Furthermore, the extraction ring is of a semi-circular structure and is rotatably connected to the positioning ring through a rotating shaft. When not in use, it can be rotated around the shaft and hidden inside the positioning ring.

[0015] Furthermore, chamfers are machined at both axial ends of the centering sleeve, and the chamfers are helpful for the insertion and extraction of the support shaft.

[0016] Furthermore, the guiding shaft is of a hollow structure. One end of the guiding shaft is inserted into the long shaft, and the other end is located outside the long shaft. The part located outside the long shaft includes a tapered surface. The tapered structure at the front end of the guiding shaft facilitates the installation of the support shaft.

[0017] The method for disassembling the fan rotor journal using the above-mentioned aero-engine fan rotor journal disassembly tooling includes,

[0018] Step 1, place the support shaft into the inner cavity of the fan rotor through the extraction ring on the support shaft, where the centering sleeve and the guiding shaft respectively cooperate with the inner diameters of the fan rotor and the spline bushing to play a centering role, and the guiding shaft contacts and stops with the low-pressure turbine shaft;

[0019] Step 2, connect the adapter to the internal threads of the front shaft of the fan rotor by rotating the fixing handle counterclockwise;

[0020] Step 3: Rotate the handle counterclockwise to rotate the ejector rod, so that the second external thread on the outer surface of the ejector rod interacts with the internal thread of the first through hole on the adapter seat. The front end of the ejector rod presses the support seat on the support shaft, and then the adapter seat drives the fan rotor to move towards the sling end until the fan rotor disengages from the interference fit section;

[0021] Step 4: Use a crane to lift the fan rotor off through the sling to complete the disassembly work.

[0022] The disassembly tooling of the present invention fully considers the assembly structure characteristics of the fan rotor, utilizes the threaded structure on the front shaft of the fan rotor, as well as the low-vortex shaft and spline bushing structures at the journal, making the disassembly tooling occupy less space and be easy to operate.

[0023] Compared with the prior art, the present invention can efficiently disassemble the fan rotor from the main engine, saving time and effort while reducing the risk during the disassembly process of the fan rotor, and improving the disassembly efficiency and quality of the fan rotor. Description of the Drawings

[0024] Figure 1 is the general assembly drawing of the disassembly and ejection tooling for the fan rotor of an aeroengine;

[0025] Figure 2 is the structure diagram of the support shaft;

[0026] Figure 3 is the structure diagram of the adapter seat;

[0027] Figure 4 is the structure diagram of the fixed handle;

[0028] Figure 5 is the structure diagram of the ejector rod;

[0029] Figure 6 is the structure diagram of the rotating handle;

[0030] Figure 7 is the structure diagram of the sling;

[0031] Figure 8 is the schematic diagram of the state when the disassembly work is carried out on the fan rotor;

[0032] In the figure, 1 - support shaft; 2 - adapter seat; 3 - fixed handle; 4 - ejector rod; 5 - rotating handle; 6 - sling; 7 - low-vortex shaft; 8 - spline bushing; 9 - adapter shaft; 10 - fan rotor journal; 11 - long shaft; 12 - support seat; 13 - centering sleeve; 14 - extraction ring; 15 - guide shaft. Detailed Embodiments

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. However, it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, all modifications, substitutions, and changes made according to ordinary technical knowledge and customary means in the art are included in the scope of the present invention.

[0034] As Figures 1 to 7 shown, the disassembly tooling for the journal of an aero-engine fan rotor mainly consists of a support shaft 1, an adapter seat 2, a fixed handle 3, a push rod 4, a rotating handle 5, and a lifting ring 6.

[0035] When in use, the disassembly tooling for the journal 10 of the aero-engine fan rotor is divided into two independent parts. Among them, the adapter seat 2, the fixed handle 3, the rotating handle 5, the lifting ring 6, and the push rod 4 form an independent part through the connecting parts (threads, welding), and the support shaft 1 is separately used as an independent part.

[0036] As Figure 2 shown, the support shaft 1 includes a long shaft 11, a support seat 12, a centering sleeve 13, an extraction ring 14, and a guiding shaft 15. Among them, the long shaft 11 is a hollow circular tube. At the first axial end of the long shaft 11, a support seat 12 that plugs the opening at the first end is fixedly connected. On the circumferential outer surface of the support seat 12, an extraction ring 14 is connected. On the circumferential outer surface of the long shaft 11, a centering sleeve 13 is arranged. The outer diameter of the centering sleeve 13 forms a fit with the inner diameter of the fan rotor. At the second axial end of the long shaft 11, a guiding shaft 15 is fixedly connected. The outer diameter of the guiding shaft 15 forms a fit with the inner diameter of the spline bushing 8;

[0037] A part of the support seat 12 is inserted into the long shaft 11, and the other part is located outside the long shaft 11. And on the end face located outside the long shaft 11, there is a ring of positioning rings. On the circumferential outer surface of the positioning rings, an extraction ring 14 is connected. The extraction ring 14 is of a semi-circular structure and is rotatably connected to the positioning rings through a rotating shaft. When not in use, it rotates 180° around the axis from the Figure 2 middle position and thus hides inside the positioning rings. Chamfers are machined at both axial ends of the centering sleeve 13. The guiding shaft 15 is of a hollow structure. One end of the guiding shaft 15 is inserted into the long shaft 11, and the other end is located outside the long shaft 11. And the part located outside the long shaft 11 includes a section of tapered surface;

[0038] As Figure 3 shown, the adapter seat 2 includes a coaxial first cylindrical surface, a second cylindrical surface, and a first through hole. The outer diameter of the first cylindrical surface is smaller than that of the second cylindrical surface. Internal threads are machined on the inner wall of the first through hole. A second through hole that vertically communicates with the first through hole is opened on the first cylindrical surface. First external threads are machined on the outer surface of the second cylindrical surface;

[0039] As Figure 4, the surface of the fixed handle 3 is knurled, and one end (the end with a smaller outer diameter) of the fixed handle 3 is inserted into the second through hole;

[0040] As Figure 5 , the ejector rod 4 includes a head and a rod portion that are coaxial and have different outer diameters. The head is machined with a first threaded hole and a second threaded hole that are perpendicular to each other. The outer surface of the rod portion is machined with a second external thread that matches the internal thread on the inner wall of the first through hole. The end of the rod portion is a spherical surface;

[0041] As Figure 6 , the surface of the rotating handle 5 is knurled, and one end of the rotating handle 5 is threadedly connected to the second threaded hole;

[0042] As Figure 7 , the lifting ring 6 includes a ring body and a threaded section, and the threaded section is connected to the first threaded hole.

[0043] When disassembling the fan rotor journal 10, as Figure 8 shown, the following steps are implemented:

[0044] Step 1: Place the support shaft 1 (1 piece) into the inner cavity of the fan rotor through the extraction ring 14 (1 piece) on the support shaft 1 (1 piece). The centering sleeve 13 (1 piece) and the guiding shaft 15 (1 piece) of the support shaft 1 (1 piece) are respectively matched with the inner diameters of the fan rotor and the spline bushing 8 to play a centering role, and the guiding shaft 15 (1 piece) contacts and stops with the low-vortex shaft 7;

[0045] Step 2: By rotating the fixed handle 3 (2 pieces) counterclockwise, connect the independent part composed of the adapter seat 2 (1 piece), the fixed handle 3 (2 pieces), the rotating handle 5 (2 pieces), the lifting ring 6 (1 piece), and the ejector rod 4 (1 piece) to the internal thread of the front shaft of the fan rotor. As Figure 8 shown in the elliptical area A in, the front shaft of the fan rotor has a threaded hole, and the external thread of the adapter seat 2 is used to connect to this threaded hole;

[0046] Step 3: Rotate the ejector rod 4 (1 piece) counterclockwise by rotating the rotating handle 5 (2 pieces). The ejector rod 4 (1 piece) interacts with the internal thread of the adapter seat 2 (1 piece). The front end of the ejector rod 4 (1 piece) and the support seat 12 (1 piece) on the support shaft 1 (1 piece) are stressed with each other. Due to the support shaft 1 (1 piece) acting on the end of the low-vortex shaft 7 and being unable to move axially, under the axial acting force, the adapter seat 2 (1 piece) drives the fan rotor to displace towards the lifting ring 6 (1 piece) end until the fan rotor disengages from the interference fit section;

[0047] Step 4: Finally, use a crane to lift the fan rotor through the lifting ring 6 (1 piece) to complete the disassembly work.

[0048] The content not described in detail in the specification of the present invention belongs to the prior art well-known to those skilled in the art. Although the illustrative specific embodiments of the present invention are described above for the understanding of those skilled in the art of the present technology, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions made using the concept of the present invention are within the scope of protection.

Claims

1. Aircraft engine fan rotor journal disassembly tooling, characterized in that: including a support shaft (1), the support shaft (1) includes a long shaft (11), a support seat (12), a centering sleeve (13), an extraction ring (14) and a guide shaft (15). Among them, the long shaft (11) is a hollow circular tube. A support seat (12) blocking the first-end opening is fixedly connected to the first axial end of the long shaft (11). An extraction ring (14) is connected to the circumferential outer surface of the support seat (12). A centering sleeve (13) is arranged on the circumferential outer surface of the long shaft (11). The outer diameter of the centering sleeve (13) forms a fit with the inner diameter of the fan rotor. A guide shaft (15) is fixedly connected to the second axial end of the long shaft (11). The outer diameter of the guide shaft (15) forms a fit with the inner diameter of the spline bushing (8). A part of the support seat (12) is inserted into the long shaft (11), and the other part is located outside the long shaft (11). And there is a positioning ring on the end face located outside the long shaft (11). The circumferential outer surface of the positioning ring is connected with an extraction ring (14); a transfer seat (2), the transfer seat (2) includes a coaxial first cylindrical surface, a second cylindrical surface and a first through hole. The outer diameter of the first cylindrical surface is smaller than that of the second cylindrical surface. Internal threads are machined on the inner wall of the first through hole. A second through hole vertically communicating with the first through hole is opened on the first cylindrical surface. First external threads are machined on the outer surface of the second cylindrical surface. The first external threads are used for connecting with the internal threads of the front shaft of the fan rotor; a fixing handle (3), one end of the fixing handle (3) is inserted into the second through hole; a push rod (4), the push rod (4) includes a head and a rod portion with the same axis and unequal outer diameters. A first threaded hole and a second threaded hole perpendicular to each other are machined on the head. Second external threads matching the internal threads on the inner wall of the first through hole are machined on the outer surface of the rod portion; a rotating handle (5), one end of the rotating handle (5) is threadedly connected to the second threaded hole; a lifting ring (6), the lifting ring (6) is threadedly connected to the first threaded hole.

2. The disassembly tooling for the journal of an aeroengine fan rotor according to claim 1, wherein: Chamfers are machined at both axial ends of the centering sleeve (13).

3. The disassembly tooling for the journal of an aero-engine fan rotor according to claim 1, wherein: The guide shaft (15) is of a hollow structure. One end of the guide shaft (15) is inserted into the long shaft (11), and the other end is located outside the long shaft (11). And the part located outside the long shaft (11) includes a conical surface.

4. The fan rotor journal disassembly method using the fan rotor journal disassembly tooling described in claim 1, characterized in that: including Step 1, place the support shaft (1) into the inner cavity of the fan rotor through the extraction ring (14) on the support shaft (1). Among them, the centering sleeve (13) and the guide shaft (15) respectively form a fit with the inner diameters of the fan rotor and the spline bushing (8) to play a centering role. The guide shaft (15) contacts and stops with the low-vortex shaft (7); Step 2, connect the transfer seat (2) with the internal threads of the front shaft of the fan rotor by rotating the fixing handle (3) counterclockwise; Step 3, rotate the push rod (4) counterclockwise by rotating the handle (5), so that the second external threads on the outer surface of the push rod (4) interact with the internal threads of the first through hole on the transfer seat (2). The front end of the push rod (4) presses the support seat (12) on the support shaft (1). Then the transfer seat (2) drives the fan rotor to move towards the lifting ring (6) end until the fan rotor disengages from the interference fit section; Step 4, use a crane to lift the fan rotor through the lifting ring (6) to complete the disassembly work.

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