Disassembling and assembling device for buffering supporting column of aircraft main landing gear

Abstract

The utility model relates to the field of disassembling and assembling devices, in particular to an aircraft main landing gear buffer strut disassembling and assembling device which comprises a rack car used for supporting an aircraft main landing gear, an outer cylinder fixing assembly used for fixing an outer cylinder and a piston rod propelling assembly used for propelling a piston rod to move. The piston rod is driven by the ball screw, the adjustable sliding support II and the adjustable sliding support I to move linearly, so that the piston rod is disassembled and assembled in the inner cavity of the outer cylinder; a special piston rod locking head is designed according to the shape of the piston rod, and the piston rod is connected with the ball screw, so that the piston rod keeps horizontal and stable.

Description

Technical Field

[0001] This utility model relates to the field of disassembly and assembly device technology, specifically a disassembly and assembly device for an aircraft main landing gear buffer strut. Background Technology

[0002] The main landing gear is a critical component that bears loads during aircraft takeoff, landing, and parking. Its complex structure and greater weight compared to other aircraft parts and components comprise multiple sub-assemblies, such as the shock absorber strut, piston rod, anti-torsion arm, locking device, and plunger assembly. In actual disassembly and assembly, the main landing gear shock absorber strut requires highly precise operation, involving accurate positioning, disassembly, and installation of various components. Failure to meet requirements necessitates replacing rubber parts and re-repairing. This process not only needs to ensure operational safety and accuracy but also requires maximizing work efficiency and minimizing labor intensity.

[0003] In existing technologies, the disassembly and assembly of the main landing gear buffer strut typically rely on general-purpose tools and simple lifting fixtures. These methods have the following drawbacks: 1. Inability to guarantee accuracy: Simple fixtures cannot provide precise positioning during assembly, easily leading to misalignment of components in the main landing gear buffer strut and affecting product quality. 2. Low operational efficiency: General-purpose tools are specific to certain applications, and the disassembly and assembly of the main landing gear buffer strut are time-consuming, increasing labor costs and maintenance cycles. 3. Insufficient safety: The main landing gear of an aircraft can weigh up to 200 kg, and existing fixtures have limited stability in terms of support and fixation, posing a risk of operator injury and component damage.

[0004] For example, a landing gear buffer strut assembly device with Chinese patent number 217071386U is applicable to the field of landing gear assembly. As can be seen from the attached drawings, it is only applicable to the front landing gear buffer strut. The front landing gear buffer strut has a different shape from the main landing gear buffer strut and cannot be directly adapted. The device is also equipped with a double linear guide rail and a piston rod fixing platform, which is complex in structure. At the same time, it does not have a leveling cup. The main landing gear weighs about 200 kg, and some models are even heavier. When the ground is uneven or the vehicle body bears a large weight, it is easy to cause instability of the vehicle body, resulting in a reduction in the accuracy of the product assembly process.

[0005] In summary, there is an urgent need for a device specifically designed for the disassembly and assembly of aircraft main landing gear struts, in order to address the shortcomings in precision, efficiency, and safety in existing technologies and provide a more reliable and efficient technical means for the disassembly and assembly of aircraft main landing gear struts. Utility Model Content

[0006] To address the aforementioned problems, this utility model proposes a device for disassembling and assembling the main landing gear strut of an aircraft.

[0007] A disassembly and assembly device for an aircraft main landing gear buffer strut includes a trolley for supporting the aircraft main landing gear, an outer cylinder fixing assembly for fixing the outer cylinder, and a piston rod pushing assembly for propelling the piston rod.

[0008] The aforementioned trolley consists of a trolley body, a trolley platform mounted on the trolley body, several sets of leveling feet mounted on the trolley body, and casters.

[0009] The outer cylinder fixing assembly includes a fixing support one and a fixing support two for fixing the outer cylinder, a fastener one set on the fixing support two, and a fastener two set on the fixing support one;

[0010] The beneficial effects of this utility model are:

[0011] This invention utilizes a ball screw and adjustable sliding supports 2 and 1 to drive the piston rod in linear motion, thereby disassembling and assembling the piston rod from the inner cavity of the outer cylinder. A dedicated piston rod locking head is designed to connect the piston rod and the ball screw, ensuring the piston rod remains horizontally stable. Adjustable sliding supports 2 and 1, along with a linear guide rail, are designed to support and adjust the piston rod, keeping it coaxial with the outer cylinder. A ball screw and screw drive handle are included to adjust the speed of piston rod movement, enabling flexible control of large-volume, heavy piston rods. The design is simple in structure, easy to use, allows for accurate disassembly and assembly of the piston rod, prevents scratching of the piston rod and its rubber parts, improves work efficiency, and ensures quality and safety. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0014] Figure 2 For the present utility model Figure 1 A schematic diagram of the structure along direction A;

[0015] Figure 3 This is a schematic diagram of the AA structure of this utility model;

[0016] Reference numerals in the attached diagram: 1. Fastener 1; 2. Fixed support 2; 3. Outer cylinder; 4. Car platform; 5. Fastener 2; 6. Fixed support 1; 7. Piston rod; 8. Sliding support 1; 9. Piston rod locking head; 10. Pin; 11. Sliding support 2; 12. Ball screw; 13. Linear guide rail; 14. Screw drive handle; 15. Leveling cup; 16. Universal wheel; 17. Car platform body. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the utility model will be further described below.

[0018] like Figures 1 to 3 As shown, an aircraft main landing gear buffer strut disassembly and assembly device includes a trolley for supporting the aircraft main landing gear, an outer cylinder fixing assembly for fixing the outer cylinder, and a piston rod pushing assembly for pushing the piston rod. The piston rod 7 is driven to move linearly through a ball screw 12 and adjustable sliding support 11 and sliding support 8, thereby disassembling and assembling the piston rod 7 from the inner cavity of the outer cylinder 3. A special fixture is designed according to the shape of the piston rod 7 to connect the piston rod 7 and the ball screw 12, so that the piston rod 7 remains horizontal and stable.

[0019] The frame vehicle consists of a frame vehicle body 17, a frame vehicle platform 4 set on the frame vehicle body 17, several sets of leveling feet 15 set on the frame vehicle body 17, and casters 16.

[0020] The outer cylinder fixing assembly includes a fixing support 6 and a fixing support 2 for fixing the outer cylinder 3, a fastener 1 set on the fixing support 2, and a fastener 5 set on the fixing support 6. It adopts multi-point support and is provided with multiple fixing supports.

[0021] The piston rod propulsion assembly includes a second sliding support 11, a first sliding support 8 for supporting the piston rod 7, a ball screw 12 mounted on the second sliding support 11, and a piston rod locking head 9 mounted on the ball screw 12 via a pin 10. The outer cylinder 3 of the main landing gear buffer strut and the piston rod 7 are fixed to the device via the piston rod locking head 9.

[0022] The platform 4 is also equipped with a linear guide rail 13 that cooperates with the sliding support 11, which can ensure the straightness of the movement of parts during disassembly and assembly.

[0023] The linear guide rail 13 is equipped with a lead screw drive handle 14 at its end. It uses a high-precision ball screw 12 for transmission, which drives the piston rod 7 of the main landing gear buffer strut to move linearly relative to the outer cylinder 3. The entire disassembly and assembly process is labor-saving, stable, and vibration-free.

[0024] The design incorporates adjustable sliding supports 11 and 8, and a linear guide rail 13, which support and adjust the piston rod 7 to maintain its coaxiality with the outer cylinder. A ball screw 12 and a screw drive handle 14 are also included to adjust the speed of the piston rod 7, enabling flexible control of the large-volume, heavy piston rod 7. The design features a simple structure, ease of use, and allows for accurate disassembly and assembly of the piston rod 7, preventing scratches on the piston rod 7 and its rubber components, thus improving work efficiency and ensuring quality and safety.

[0025] The piston rod locking head 9 is designed to fit the piston rod 7 and is specially designed to connect the piston rod 7 and the ball screw 12, so that the piston rod 7 remains horizontal and stable.

[0026] To ensure the coaxiality of the piston rod 7 and the outer cylinder 3 required during the assembly of the main landing gear buffer strut, both fixed support 6 and fixed support 2 are precision machined to provide a precise positioning method.

[0027] The pin shaft 10 is provided in at least two sets, which can be increased or decreased according to the actual situation.

[0028] The specific process steps are as follows:

[0029] 1. Install outer cylinder 3: Tighten the leveling cup 15 fixing device, fix the outer cylinder 3 of the main landing gear buffer strut to the fixed support 2 on the platform 4, and lock it with fastener 1 and fastener 2 5.

[0030] 2. Connect piston rod 7: Connect the piston rod 7 of the main landing gear buffer strut to the piston rod locking head 9, insert the pin 10 into the piston rod locking head 9, and make slight adjustments to the sliding support 8 to make the piston rod 7 horizontal.

[0031] 3. Disassembly and assembly of the main landing gear buffer strut: During disassembly, rotate the screw drive handle 14 counterclockwise. The sliding support 1 8, the sliding support 2 11 and the piston rod 7 move together along the guide rail until the piston rod 7 disengages from the outer cylinder 3. Then disassemble the outer cylinder 3 and the piston rod 7. During assembly, first fix the outer cylinder 3. The piston rod 7 is fixedly connected to the ball screw 12 through the piston rod locking head 9 and the pin 10. Adjust it to be horizontal and coaxial with the outer cylinder 3. Slowly push the piston rod 7 into the inner cavity of the outer cylinder 3 in a clockwise direction. Then perform other assembly work.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An aircraft main landing gear shock strut disassembly and assembly apparatus, characterized by: The utility model relates to a kind of aircraft main landing gear support frame, outer tube fixing assembly for fixing outer tube, piston rod propulsion assembly for propelling piston rod movement; The frame trolley is provided with a frame trolley body (17), a frame trolley table (4) arranged on the frame trolley body (17), a plurality of groups of leveling foot cups (15) arranged on the frame trolley body (17) and universal wheels (16). The outer tube fixing assembly comprises a first fixing support (6) and a second fixing support (2) for fixing the outer tube (3), a buckle (1) arranged on the second fixing support (2) and a buckle (5) arranged on the first fixing support (6). The piston rod propulsion assembly comprises a sliding support (8) for supporting the piston rod (7), a ball screw (12) arranged on the sliding support (11), and a piston rod locking head (9) arranged on the ball screw (12) through a pin shaft (10).

2. An aircraft landing gear shock absorber strut disassembly and assembly device according to claim 1, characterised in that: The frame trolley table (4) is further provided with a linear guide rail (13) matched with the sliding support (11).

3. An aircraft landing gear shock absorber strut disassembly and assembly device according to claim 2, characterised in that: The linear guide rail (13) is provided with a screw drive handle (14) at the end.

4. An aircraft landing gear shock absorber strut disassembly and assembly device according to claim 1, wherein: The piston rod locking head (9) is matched with the piston rod (7).

5. An aircraft landing gear shock absorber strut disassembly and assembly device according to claim 1, wherein: The piston rod (7) is coaxial with the outer tube (3).

6. An aircraft landing gear shock absorber strut disassembly and assembly device according to claim 1, wherein: The pin shaft (10) is provided with at least two groups.

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