Special dismounting tool for lifting point of GEnx engine

Abstract

The utility model relates to the field of civil aero-engines, in particular to a dismounting tool special for a GEnx engine lifting point. The problems that when an existing GEnx engine rear lifting point is disassembled, operation is inconvenient, and the engine rear lifting point or bolts and nuts are prone to being damaged are mainly solved. One end of the bolt head fixing seat (2) is connected with a bolt head of a lifting point fixing bolt, the other end of the bolt head fixing seat (2) is connected with the inner sleeve (3), the outer part of the inner sleeve (3) is movably connected with the outer sleeve (5), the outer part of the outer sleeve (5) is fixedly provided with the mounting seat (6), and the mounting seat (6) is provided with a mounting seat clamping groove (10) matched with a turbine exhaust casing mounting edge (24); the outer sleeve (5) is sleeved with a pressure spring (4), and the pressure spring (4) is located between the bolt head fixing base (2) and the installation base (6). The dismounting tool can avoid damage to the rear lifting point of the engine, bolts, nuts and nearby parts, saves manpower and is convenient to operate.

Description

Technical Field

[0001] This utility model relates to the field of civil aviation engines, specifically a special disassembly tool for the lifting points of a GEnx engine. Background Technology

[0002] The GEnx (General Electric next-generation) engine is the power plant for the Boeing 747-8 aircraft. Currently, each Boeing 747-8 aircraft is equipped with four GEnx high-bypass turbofan engines. During off-wing maintenance and repair, the engine's rear mounting point often needs to be removed and reinstalled. Due to the engine's large size and the fact that the rear mounting point is located on top of the core engine turbine exhaust casing, approximately 3 meters above the ground, removal and installation are very inconvenient. Specifically, this manifests in two ways: First, as a key structural component connecting the engine to the aircraft pod, the rear sling point requires a large bolt and nut installation torque of approximately 1300 lb-pounds. Disassembly using commonly used tools requires a long lever arm, typically necessitating three personnel to complete the disassembly and installation work. Second, the rear sling point and its bolts and nuts are expensive, resulting in high repair and replacement costs. Furthermore, the rear sling point's location is difficult to access, with limited operating space, making tool control challenging. During construction, tool misalignment and detachment are prone to occur, causing damage to the rear sling point itself, bolts, nuts, and surrounding components. This not only incurs significant economic losses from accessory repairs and bolt / nut replacements but may also pose safety risks such as personnel injury.

[0003] Currently, there are no specialized tools designed for the disassembly of the rear mounting points of GEnx engines within the global fleet. Therefore, the risk of damage to the rear mounting points and their bolts and nuts due to disassembly has not been effectively eliminated. Summary of the Invention

[0004] To overcome the shortcomings of existing GEnx engine rear lifting point disassembly methods, which are inconvenient and prone to damage to the engine rear lifting point or bolts and nuts, this utility model provides a dedicated disassembly tool for GEnx engine lifting points. This dedicated disassembly tool for GEnx engine lifting points can avoid damage to the engine rear lifting point, bolts and nuts and nearby components, save manpower and is easy to operate.

[0005] The technical solution of this utility model is: a special disassembly tool for GEnx engine lifting points, including a lifting point fixing device. The lifting point fixing device includes a bolt head fixing seat, one end of which is connected to the bolt head of the lifting point fixing bolt, and the other end is connected to an inner sleeve. An outer sleeve is movably connected to the outside of the inner sleeve. A mounting seat is fixed on the outside of the outer sleeve. The mounting seat has a mounting seat groove that mates with the mounting edge of the turbine exhaust casing. A pressure spring is fitted on the outside of the outer sleeve, and the pressure spring is located between the bolt head fixing seat and the mounting seat.

[0006] Furthermore, the mounting base is connected to the turbine exhaust casing mounting edge via a mounting base locating pin.

[0007] Furthermore, there are two mounting slots, which respectively mate with the mounting edges of the turbine exhaust casing on both sides; there are two mounting positioning pins, which pass through the mounting seat and connect to the mounting edges of the turbine exhaust casing.

[0008] Furthermore, the end of the mounting base positioning pin is connected to the mounting base positioning pin knob.

[0009] Furthermore, a bolt head locating pin is provided at the center of the bolt head fixing seat, and the bolt head locating pin cooperates with the center hole of the bolt head of the lifting point fixing bolt.

[0010] Furthermore, the inner sleeve and the outer sleeve are circumferentially positioned by a sleeve locking pin.

[0011] Furthermore, the inner sleeve is fixed at the end of the inner sleeve rotating shaft.

[0012] Furthermore, it also includes a disassembly wrench, which includes a nut fixing seat, one end of which is connected to the nut of the lifting point fixing bolt, and the other end is connected to a torque amplifier, on which a ratchet wrench is connected.

[0013] This utility model has the following beneficial effects: Due to the above-mentioned solution, the disassembly tool uses the engine body as the tool positioning and fixing carrier, employs a spring instead of manual clamping force, and uses the turbine exhaust casing mounting edge as the positioning reference, ensuring precise positioning and reliable fixing. This eliminates the tool's tendency to come loose due to shaking during manual handling, preventing damage to the lifting point body, lifting point fixing bolts and nuts, and surrounding components, while also reducing personnel input. The disassembly wrench uses a ratchet wrench and incorporates a torque amplification device, thereby shortening the lever arm, solving the problem of insufficient working space, and avoiding the risk of injury to personnel and engine components.

[0014] Because the GEnx engine rear mounting points are frequently disassembled and reassembled during off-wing maintenance and repair, and the cost of purchasing and maintaining aviation equipment is high, the use of this tool can reduce the risk of damage to various engine components during disassembly and reassembly, avoid additional repair or replacement time, and effectively reduce the equipment damage rate. This greatly improves the efficiency of off-wing engine maintenance and repair and saves maintenance costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention in operation;

[0016] Figure 2 , Figure 3This is a perspective view of the suspension point fixing device in this utility model;

[0017] Figure 4 This is an outline drawing of the suspension point fixing device;

[0018] Figure 5 It is along Figure 4 Sectional view of AA;

[0019] Figure 6 This is the front view of the wrench being removed;

[0020] Figure 7 This is the left view of the removal wrench.

[0021] In the diagram, 1-bolt head locating pin, 2-bolt head fixing seat, 3-inner sleeve, 4-compression spring, 5-outer sleeve, 6-mounting seat, 7-sleeve locking pin, 8-inner sleeve rotating bushing, 9-mounting seat locating pin, 10-mounting seat slot, 11-mounting seat locating pin knob, 12-nut fixing seat, 13-torque amplifier, 14-ratchet wrench, 15-ratchet direction adjuster, 16-ratchet tool locking device, 21-lifting point fixing device, 22-removal wrench, 23-engine rear lifting point, 24-turbine exhaust casing mounting edge. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0023] In the description of this utility model, it is necessary to understand that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "top", and "bottom" are all based on the orientation or positional relationship shown in the accompanying drawings. The purpose is only to facilitate the description of this utility model and simplify the description, and is not intended to indicate or imply that the indicated component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0024] Depend on Figures 1 to 7 As shown, a special tool for removing the lifting point of a GEnx engine includes a lifting point fixing device 21 and a removal wrench 22. In use, the lifting point fixing device 21 is fixed between the rear lifting point 23 of the engine and the turbine exhaust casing mounting edge 24, and the bolt head of the lifting point fixing bolt is fixed to prevent the lifting point fixing bolt from rotating. The removal wrench 22 is fitted on the nut of the lifting point fixing bolt, and the nut is turned to remove the rear lifting point.

[0025] The lifting point fixing device 21 includes a bolt head fixing seat 2. One end of the bolt head fixing seat 2 has an internal hexagonal groove. The size of this groove is determined according to the external dimensions of the rear lifting point bolt head of the GEnx engine, and it can fit over the bolt head of the lifting point fixing bolt. Simultaneously, since the bolt head end face of the current lifting point fixing bolt has a central hole, this tool has a bolt head locating pin 1 at the center of the internal hexagonal groove. The bolt head locating pin 1 mates with the central hole of the bolt head of the lifting point fixing bolt. During processing, the depth of the internal hexagonal groove of the bolt head fixing seat 2 should not exceed the thickness of the bolt head of the lifting point fixing bolt, so that the bolt head fixing seat 2 can tighten the lifting point fixing bolt when subjected to upward force.

[0026] The other end of the bolt head fixing seat 2 is connected to the inner sleeve 3. The inner sleeve 3 is movably connected to the outer sleeve 5, which is fitted over the inner sleeve 3, allowing them to rotate relative to each other. A mounting seat 6 is fixed to the outside of the outer sleeve 5, and a pressure spring 4 is fitted over the outer sleeve 5, positioned between the bolt head fixing seat 2 and the mounting seat 6. When the mounting seat 6 is fixed, the spring force of the pressure spring 4 can push the bolt head fixing seat 2 upwards, thereby tightening the lifting point fixing bolt and preventing it from rotating when the nut is removed.

[0027] The mounting base 6 is fixed to the outside of the outer sleeve 5 and can move and rotate axially together with the outer sleeve 5. The mounting base 6 has mounting base slots 10 that mate with the turbine exhaust casing mounting edge 24. The mounting base 6 and the turbine exhaust casing mounting edge 24 are connected by mounting base locating pins 9. Since the inner sleeve 3 and the outer sleeve 5 can rotate relative to each other, the mounting base 6 can be rotated during operation to align the mounting base slots 10 with the turbine exhaust casing mounting edge 24. There are two mounting base slots 10, designed to fix the mounting base 6 to the turbine exhaust casing mounting edges on both sides. Therefore, the mounting base slots 10 need to be machined to match the position of the turbine exhaust casing mounting edges. Similarly, there are also two mounting base locating pins 9, and for ease of operation, each mounting base locating pin 9 has a mounting base locating pin knob 11 connected to its end. In use, rotating the mounting base locating pin knob 11 causes the mounting base locating pin 9 to pass through the mounting base 6 and connect to the bolt hole on the turbine exhaust casing mounting edge, thereby fixing the mounting base 6 to the turbine exhaust casing mounting edge.

[0028] The inner sleeve 3 and the outer sleeve 5 are circumferentially positioned by sleeve locking pins 7. The sleeve locking pin 7 is connected to the outer sleeve 5, and its end passes through the outer sleeve 5 and connects to the inner sleeve 3. Tightening the sleeve locking pin 7 fixes the inner sleeve 3 and outer sleeve 5 relative to each other, preventing rotation. Since the mounting base 6 is fixed to the outer sleeve 5, and the bolt head fixing seat 2 is fixed to the inner sleeve 3, tightening the sleeve locking pin 7 also fixes the mounting base 6 and the bolt head fixing seat 2 relative to each other. Two sleeve locking pins 7 are used for tightening, symmetrically arranged circumferentially. To facilitate tightening, an operating rod can be connected to the end of each sleeve locking pin 7.

[0029] The inner sleeve 3 is fixed to the end of the inner sleeve rotating bushing 8. The inner sleeve rotating bushing 8 is hexagonal in shape and can be machined as a whole with the inner sleeve 3 or fixed on the inner sleeve 3. Under normal circumstances, the inner sleeve rotating bushing 8 is not needed. However, when disassembling the nut of the lifting point fixing bolt, if the spring of the pressure spring 4 cannot fix the bolt head of the lifting point fixing bolt, an external hex wrench can be inserted into the inner sleeve rotating bushing 8 to fix the screw head fixing seat 2, thereby further strengthening the fixation of the bolt head of the lifting point fixing bolt.

[0030] The disassembly tool also includes a disassembly wrench 22, which is used in conjunction with the lifting point fixing device 21. The disassembly wrench 22 includes a nut fixing seat 12, with an internal hexagonal groove at one end. This groove mates with the nut of the lifting point fixing bolt. In use, the internal hexagonal groove fits onto the nut of the lifting point fixing bolt. The other end of the nut fixing seat 12 is connected to a torque amplifier 13, which in turn is connected to a ratchet wrench 14. The torque amplifier 13 can significantly reduce the input torque of the ratchet wrench 14, thereby shortening the lever arm length. Furthermore, the ratchet wrench 14 employs a bidirectional adjustable ratchet. By adjusting the direction of the ratchet direction adjuster 15 and coordinating with the locking device 16, the ratchet wrench 14 can simultaneously meet the reciprocating stroke requirements during bolt disassembly and installation, preventing excessive lever arm length from causing contact with the rear lifting point and other surrounding components, thus avoiding the risk of component damage.

[0031] When using this GEnx engine lifting point removal tool, place the bolt head fixing seat 2 onto the bolt head of the lifting point fixing bolt; rotate the outer sleeve 5 and mounting seat 6 to the appropriate position, and fix the mounting seat 6 to the turbine exhaust casing mounting edge 24 through the mounting seat positioning pin 9; at this time, the pressure spring 4 will push the bolt head fixing seat 2 upward, thereby fixing the lifting point fixing bolt. Place the nut fixing seat 12 of the removal wrench 22 onto the nut of the lifting point fixing bolt, and adjust the ratchet direction adjuster 15 of the ratchet wrench 14 to the counterclockwise position. Rotating the removal wrench 22 will unscrew the nut of the lifting point fixing bolt. When installing the lifting point, simply adjust the ratchet direction adjuster 15 of the ratchet wrench 14 to the clockwise or counterclockwise position and tighten the nut of the lifting point fixing bolt.

[0032] This disassembly tool uses the engine body as its positioning and fixing carrier, employs springs instead of manual clamping force, and uses the turbine exhaust casing mounting edge as the positioning reference. This ensures precise positioning and reliable fixing, eliminating the risk of tool detachment due to hand movement during handling, as is common with traditional tools. It also prevents damage to the lifting point and surrounding components, while reducing personnel requirements. The disassembly wrench is a ratchet wrench with a torque amplification device, shortening the lever arm and solving the problem of insufficient working space, thus avoiding the risk of injury to personnel and engine components.

[0033] Because the GEnx engine rear pylon is frequently disassembled and reassembled during off-wing maintenance and repair, the application of this disassembly tool can reduce the risk of component damage during disassembly and reassembly, avoid additional repair or replacement time, and reduce personnel input. Therefore, it greatly improves the efficiency of off-wing engine maintenance and repair. Furthermore, due to the high cost of purchasing and maintaining aviation equipment, the use of this tool can effectively reduce the equipment damage rate, thereby saving maintenance costs, with an average saving of 20,000 RMB per unit. Moreover, disassembling the GEnx rear pylon using traditional general-purpose tools typically requires three workers simultaneously, while using this specialized disassembly tool only requires two workers, saving labor costs. Therefore, with the booming development of the civil aviation industry in recent years and the linear growth in the number of aircraft operated by various airlines, the application scenarios of the GEnx engine pylon disassembly tool are also applicable to other aircraft engines, with obvious advantages, high promotional value, and good application prospects.

[0034] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A GEnx engine hanger point specific removal tool comprising a hanger point fixture (21), characterized by: The lifting point fixing device (21) comprises a bolt head fixing seat (2), one end of which is connected with the bolt head of the lifting point fixing bolt, and the other end is connected with an inner sleeve (3), the outer part of the inner sleeve (3) is movably connected with an outer sleeve (5), the outer part of the outer sleeve (5) is fixedly connected with a mounting seat (6), the mounting seat (6) is provided with mounting seat clamping grooves (10) matched with the turbine exhaust manifold mounting edges (24); the outer part of the outer sleeve (5) is sleeved with a pressure spring (4), and the pressure spring (4) is located between the bolt head fixing seat (2) and the mounting seat (6).

2. The GEnx engine pylon specific tooling of claim 1, wherein: The mounting seat (6) and the turbine exhaust manifold mounting edges (24) are connected through mounting seat positioning pins (9).

3. The GEnx engine pylon specific tooling of claim 2, wherein: The mounting seat clamping grooves (10) are two, which are matched with the turbine exhaust manifold mounting edges (24) on both sides; the mounting seat positioning pins (9) are two, which are connected on the turbine exhaust manifold mounting edges after penetrating through the mounting seat (6).

4. The GEnx engine pylon specific tooling of claim 3, wherein: The mounting seat positioning pins (9) are connected with mounting seat positioning pin knobs (11) at the ends.

5. The GEnx engine pylon specific tooling of any of claims 1-4, wherein: The bolt head fixing seat (2) is provided with a bolt head positioning pin (1) at the center, which is matched with the center hole of the bolt head of the lifting point fixing bolt.

6. The GEnx engine pylon specific tooling of claim 5, wherein: The inner sleeve (3) and the outer sleeve (5) are circumferentially positioned through a sleeve locking pin (7).

7. The GEnx engine pylon specific tooling of claim 6, wherein: The end of the inner sleeve (3) is fixedly connected with an inner sleeve rotating shaft sleeve (8).

8. The GEnx engine pylon specific tooling of any of claims 1-4, 6, 7, characterized in that: Further comprising a dismounting wrench (22), the dismounting wrench (22) comprises a nut fixing seat (12), one end of which is connected with the nut of the lifting point fixing bolt, and the other end is connected with a torque amplifier (13), the torque amplifier (13) is connected with a ratchet wrench (14).

Images