Disassembling and assembling tool for large screw cap of helicopter rotor wing

Abstract

The utility model provides a disassembling and assembling tool for a large nut of a helicopter rotor wing, which relates to the technical field of helicopter maintenance and mainly comprises a reverse twisting fixing component, a planetary gear transmission mechanism and a force application disassembling and assembling frame, the reverse twisting fixing assembly is fixed to a hole position in the top of the rotor shaft through a pin, and a fixing piece and a reverse twisting piece of the reverse twisting fixing assembly are matched through a protrusion-notch structure. The planetary gear transmission mechanism is of a 2Z-X type two-stage speed reduction structure, the input end of the planetary gear transmission mechanism is connected with a special wrench, and the output end of the planetary gear transmission mechanism is in butt joint with a notch of the force application disassembly and assembly frame. The force application dismounting frame is provided with a bayonet matched with a rotor wing large nut, a knurled handle and a circumferential observation notch, the outer diameter is optimized to be 180 mm, and 12 symmetrical observation windows are arranged. According to the device, the rotor braking requirement is eliminated through reverse twisting fixation, high torque can be output through single-person operation by means of the planetary speed reduction mechanism, accurate centering is ensured through cooperation with a special bayonet structure, the disassembly and assembly efficiency is remarkably improved, the maintenance risk is reduced, and the device is suitable for efficient maintenance work of a helicopter rotor system.

Description

Technical Field

[0001] This utility model relates to the field of helicopter maintenance technology, specifically to a tool for disassembling and assembling the large nut on a helicopter rotor. Background Technology

[0002] In helicopter maintenance, the disassembly and assembly of the rotor nut is a critical and challenging task. Existing tools are typically simple, readily available tools used only to secure the rotor nut and transmit torque. When using these tools, the rotor shaft must first be locked in place using the rotor brake to prevent it from moving during disassembly. However, this method has several drawbacks: preparation is cumbersome, requiring the rotor to be braked and the rotor shaft status constantly monitored to prevent movement; the required torque for disassembly is high, resulting in low efficiency and requiring multiple personnel to work together, increasing the workload of aircraft maintenance; the safety factor is low, and the coordination of multiple operators is complex, increasing the risk of injury; improper alignment or uneven force during twisting can damage the rotor nut, and instability during operation can easily damage surrounding components; in special and other complex environments, the disassembly and assembly process is complex and slow, hindering rapid equipment repair.

[0003] These issues directly impact helicopter availability and operational readiness. Therefore, designing a tool that facilitates the disassembly and installation of the helicopter rotor nut is of great significance for improving helicopter rotor maintenance efficiency, shortening repair time, and reducing maintenance costs. Utility Model Content

[0004] To achieve the above objectives, this utility model provides the following technical solution: a tool for disassembling and assembling a large nut on a helicopter rotor, comprising:

[0005] An anti-torsion fixing assembly includes a fixing member and an anti-torsion member coaxially connected to the rotor shaft. The fixing member is fixed to the top hole of the rotor shaft by a pin. The anti-torsion member is provided with a protrusion, and the fixing member is provided with a notch. The protrusion can be connected with the notch.

[0006] The planetary gear transmission mechanism includes a sun gear, planet gears, an external gear ring, and a planet carrier. The planetary gear transmission mechanism adopts a 2Z-X type two-stage reduction structure. The input end of the planetary gear transmission mechanism is connected to a special wrench, and the output end of the planetary gear transmission mechanism is connected to a force-applying disassembly and assembly frame through a rotating head.

[0007] The force-applying assembly / disassembly frame has a locking slot on its inner side that matches the rotor nut, and rotatable handles on both sides of the force-applying assembly / disassembly frame.

[0008] The planetary gear transmission mechanism has a rotating head at its output end, and the force-applying assembly / disassembly frame has a slot at its top, with the rotating head engaging with the slot.

[0009] Preferably, the bottom of the fastener has nine holes evenly spaced.

[0010] Preferably, the pin is configured as a safety pin.

[0011] Preferably, the top of the anti-torsion member is provided with a square opening, and the planetary gear transmission mechanism is provided with an anti-torsion rod, the square opening being inserted into the anti-torsion rod.

[0012] Preferably, the sun gear is configured as a primary input terminal, and the planet gears are secondary planet gears, wherein the sun gear can mesh with the external gear ring through the secondary planet gears.

[0013] Preferably, the outer diameter of the force-applying assembly / disassembly frame is set to 180mm, and 12 observation slots are symmetrically opened in the circumference of the force-applying assembly / disassembly frame.

[0014] Preferably, the thickness of the slot provided on the top of the force-applying assembly / disassembly frame is 20mm.

[0015] Preferably, the handle is 95mm long, the surface of the handle is knurled, and the tail of the handle is rounded.

[0016] Preferably, the outer diameter of the rotating head is 68mm.

[0017] Preferably, the upper end of the rotating head is provided with a flange, the flange is provided with 6 replaceable slots, and the diameter of the flange is 96mm.

[0018] The application employs the above technical solution and has at least the following beneficial effects:

[0019] By connecting the anti-torque fixing component to the rotor shaft, anti-torque is provided, eliminating the need for cumbersome braking operations such as braking the rotor and constantly observing the rotor shaft status before disassembly and assembly, thus simplifying the disassembly and assembly process; it changes the traditional method of multiple people working together, and achieves torque multiplication through planetary gear transmission mechanism, making operation more labor-saving and reducing labor costs; the force application disassembly and assembly frame fits well with the rotor large nut, avoiding damage to the rotor large nut caused by misalignment or uneven force in all directions during twisting, and also reducing collision damage to surrounding components during operation.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram provided by an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the anti-torsion fixing component provided in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the force-applying assembly / disassembly frame provided in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the planetary gear transmission mechanism provided in an embodiment of this utility model;

[0026] In the diagram: 1. Anti-torsion fixing component; 2. Planetary gear transmission mechanism; 3. Force application disassembly frame; 4. Rotor shaft; 5. Special wrench; 11. Fixing component; 12. Anti-torsion component; 111. Notch; 112. Hole; 121. Protrusion; 122. Square opening; 23. External gear ring; 24. Planetary carrier; 25. Rotating head; 26. Flange; 31. Bayonet; 32. Handle; 33. Groove; 34. Observation groove. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] A specific embodiment of this utility model provides a tool for disassembling and assembling a large nut on a helicopter rotor, such as... Figure 1 As shown, it mainly consists of three parts: an anti-torsion fixing component, a planetary gear transmission mechanism, and a force-applying assembly / disassembly frame. The anti-torsion fixing component is connected to the helicopter rotor shaft to prevent the rotor shaft from moving during the assembly / disassembly of the rotor nut, thus reducing rotor braking operations. The planetary gear mechanism, as a transmission mechanism, achieves torque multiplication through manual operation. The force-applying assembly / disassembly frame connects the output end of the planetary gear mechanism to the rotor nut, achieving the assembly / disassembly of the rotor nut through force transmission.

[0029] like Figure 2As shown, the anti-torque fixing component is installed inside the rotor's large nut and connected to the rotor shaft. It provides anti-torque during disassembly and assembly, preventing the rotor shaft and disassembly / assembly tools from moving together, avoiding the need to brake the rotor shaft before disassembly and assembly, and solving the cumbersome problem in the disassembly and assembly process.

[0030] The fastener is mounted on the top of the helicopter rotor shaft and is concentric with the rotor shaft. Its upper outer dimension is the same as the outer dimension of the helicopter rotor shaft, with a diameter of 141mm. Six notches are provided on the top for connection with the anti-torsion component. Its lower outer dimension is slightly smaller than the inner dimension of the helicopter rotor shaft to accommodate it; its diameter is 118mm. Nine evenly spaced holes are provided on the lower part, corresponding to the nine holes on the top of the rotor shaft, for inserting pins for fixation, and secured with safety pins.

[0031] The anti-torsion component is mounted above the fixed component, engaging with it via a lower protrusion and being concentric with it. The lower dimension is the same as the outer dimension of the fixed component, with a diameter of 140mm, and features six protrusions that mate with six notches on the fixed component. To minimize the weight of the components while ensuring sufficient strength, the upper dimension is designed to be smaller, with a diameter of 86mm, and includes a square opening for inserting the anti-torsion rod of the rotating head.

[0032] After the fastener is installed on the top of the helicopter rotor shaft and securely fixed to the rotor shaft, the protrusion of the anti-torsion component is matched with the groove of the fastener.

[0033] like Figure 3 As shown, the force-applying assembly / disassembly frame rotates via a planetary gear transmission mechanism, primarily bearing the surface pressure of the gear teeth and the rotor nut. Handles are located on both sides for picking up / dropping tools and adjusting the position, while a protrusion at the bottom applies force to the rotor nut.

[0034] The assembly / disassembly frame structure is optimized based on the original tool design, designed to directly contact the rotor's large nut and transmit torque. The inner dimensions of the frame are the same as the outer dimensions of the rotor's large nut, with a diameter of 160mm. To ensure sufficient performance and prevent deformation during operation, the frame's thickness has been increased to 10mm, resulting in an outer diameter of 180mm. Two handle mounting seats are located on each side of the frame, with slots at the top for connection with the rotor head; the upper part is 20mm thick. Twelve slots are evenly distributed around the frame's perimeter. These slots significantly reduce the overall weight of the frame and facilitate observation of the internal assembly / disassembly process from multiple angles.

[0035] To facilitate the installation, adjustment, and removal of the frame, a specially designed handle conforms to the ergonomic grip. The surface features a knurled finish to enhance comfort and friction for a smoother grip. The rounded end prevents bumps and scratches, ensuring safety. The handle is 95mm long.

[0036] The handle is connected to the handle mounting base via a pin and can rotate around the pin. When connecting the disassembly bracket to the large nut, gripping the handle firmly with both hands makes operation easier, and the position of the disassembly bracket can be adjusted according to the degree of connection, making it more convenient.

[0037] like Figure 4 As shown, the planetary gear transmission mechanism multiplies torque through planetary gear transmission. The planetary carrier is connected to the lower fixed component. The sun gear applies torque through an external tool, driving the outer planetary gears to rotate. The rotation of the planetary gears drives the outer housing to rotate, thus achieving force transmission and multiplication. Through reasonable structural design, the planetary gear transmission mechanism has been successfully applied to the rotor nut assembly / disassembly tool, achieving efficient and stable power transmission.

[0038] NGW type planetary gears are commonly used reduction mechanisms, offering advantages such as compact structure, high transmission efficiency, light weight, and small size. In operation, they can rotate in both directions; the planetary gears on the planet carrier can both revolve around the sun gear and rotate on their own axis. This same structure can achieve two-stage or multi-stage transmission. In this design, a two-stage reduction is required, demanding high transmission efficiency while maintaining a simple structure and stable transmission. Therefore, a 2Z-X type planetary gear transmission mechanism is selected for internal transmission.

[0039] The drive rotor mechanism is mounted below the planetary gear mechanism, serving as a transmission mechanism to provide torque to the mounting frame. The drive rotor mechanism consists of two parts: an anti-torsion bar and a rotor. The rotor is located at the bottom of the planetary gear transmission mechanism. The upper end of the anti-torsion bar is gear-shaped, providing constraint and a platform for the rotation of the sun gear. The lower end is a square plug, which is used to maintain its fixation by inserting an anti-torsion fixing component. The rotor is mounted below the planetary gear mechanism, and its upper end has a flange design for mating with the outer ring of the planetary gear mechanism. Since the rotor is a wear part, its replaceability was considered in the design; six slots are provided on the flange for fixing and replacement. The rotor has an inner diameter of 58mm, an outer diameter of 68mm, and a flange diameter of 96mm. During operation, the anti-torsion bar provides anti-torsion, and the rotor is driven by the increased torque of the outer ring of the planetary gears.

[0040] The planetary gear transmission mechanism is a two-stage reduction and torque amplification system. The planetary gears are mounted on the planet carrier, and the planetary gears, sun gear, and external gear ring are driven by gear meshing. The input end is the first-stage sun gear, which drives the first-stage planetary gears and the first-stage planet carrier to rotate, causing the second-stage sun gear to rotate, which in turn drives the second-stage planetary gears. The planetary gears rotate along the external gear ring, driving the external gear ring to rotate.

[0041] Working principle of this utility model device:

[0042] Prepare for helicopter maintenance and ensure surrounding safety → Remove the power supply equipment on the upper rotor → Remove the fuselage safety pin, fuse plate, and fuse plate screw from the large rotor nut → Connect and secure the anti-torsion fixing assembly to the helicopter rotor shaft → Align the force-applying disassembly / reassembly bracket with the large rotor nut → Align the output end of the planetary gear mechanism with the force-applying disassembly / reassembly bracket → Use a special wrench to turn the input end of the planetary gear mechanism to transmit force through gear transmission, thus completing the disassembly / reassembly.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tool for disassembling and assembling a large nut on a helicopter rotor, characterized in that, include: The anti-torsion fixing assembly (1) includes a fixing member (11) and an anti-torsion member (12) coaxially connected to the rotor shaft (4). The fixing member (11) is fixed to the top hole of the rotor shaft (4) by a pin. The anti-torsion member (12) is provided with a protrusion (121), and the fixing member (11) is provided with a notch (111). The protrusion (121) can be connected with the notch (111). Planetary gear transmission mechanism (2), the planetary gear transmission mechanism (2) includes a sun gear, planet gears, an external gear ring (23) and a planet carrier (24), the planetary gear transmission mechanism (2) adopts a 2Z-X type two-stage reduction structure, and the top of the planetary gear transmission mechanism (2) is connected to a special wrench (5); The force-applying assembly and disassembly frame (3) has a bayonet (31) on its inner side that matches the rotor nut, and rotatable handles (32) on both sides of the force-applying assembly and disassembly frame (3). The planetary gear transmission mechanism (2) is provided with a rotating head (25) at its bottom end, and the force-applying disassembly frame (3) is provided with a slot (33) at its top. The rotating head (25) is connected to the slot (33).

2. The helicopter rotor nut disassembly and assembly tool according to claim 1, characterized in that: The bottom of the fastener (11) is provided with nine holes (112) evenly spaced.

3. The helicopter rotor nut disassembly and assembly tool according to claim 2, characterized in that: The pin is configured as a safety pin.

4. The helicopter rotor nut disassembly and assembly tool according to claim 1, characterized in that: The top of the anti-torsion member (12) is provided with a square opening (122), and the planetary gear transmission mechanism (2) is provided with an anti-torsion rod. The square opening (122) is inserted into the anti-torsion rod.

5. The helicopter rotor nut disassembly and assembly tool according to claim 1, characterized in that: The sun gear is set as a primary input terminal, and the planet gear is a secondary planet gear. The sun gear can mesh with the external gear ring (23) through the secondary planet gear.

6. The helicopter rotor nut disassembly and assembly tool according to claim 1, characterized in that: The outer diameter of the force-applying assembly / disassembly frame (3) is set to 180 mm, and 12 observation slots (34) are symmetrically opened in the circumference of the force-applying assembly / disassembly frame (3).

7. A helicopter rotor nut disassembly and assembly tool according to claim 6, characterized in that: The thickness of the slot (33) provided on the top of the force-applying assembly / disassembly frame (3) is 20mm.

8. The helicopter rotor nut disassembly and assembly tool according to claim 1, characterized in that: The handle (32) is 95mm long, the surface of the handle (32) is knurled, and the tail of the handle (32) is rounded.

9. A helicopter rotor nut disassembly and assembly tool according to claim 1, characterized in that: The outer diameter of the rotor (25) is 68 mm.

10. A helicopter rotor nut disassembly and assembly tool according to claim 9, characterized in that: The upper end of the rotating head (25) is provided with a flange (26), the flange (26) is provided with 6 replaceable slots, and the diameter of the flange (26) is 96mm.

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