Undercarriage fake part structure
By designing a landing gear dummy structure and using components such as fixed pins and side strut adapters, the problems of high cost and insufficient testing accuracy in existing technologies have been solved. This enables accurate simulation of the multi-directional stress state of the landing gear, improving the accuracy and structural strength of aircraft ground testing.
Patent Information
- Application Number
- CN202511625967.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-07
- Publication Date
- 2025-12-12
AI Technical Summary
Existing technologies cannot guarantee the accuracy and structural strength of landing gear testing while controlling costs, and it is difficult to accurately simulate multi-directional stress states, which affects aircraft ground testing.
A landing gear dummy structure is designed, which uses components such as fixed pins, side strut adapters, vertical and lateral loading joints, and yaw loading joints to simulate the static, dynamic, and combined loads of mechanical parts, forming a benchmark-loading closed loop to ensure that the loading force is accurately applied to the dummy body.
This technology enables precise simulation of multi-directional stress states of landing gear while controlling costs, improving the accuracy of test data and structural strength, and reducing errors caused by positioning deviations.
Smart Images
Figure CN121106744A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of aircraft ground testing equipment technology, and in particular to a landing gear dummy structure. Background Technology
[0002] Aircraft landing gear is a critical component for ensuring flight safety, and its performance testing is of paramount importance. Currently, the industry commonly uses real landing gear or simplified fixtures for testing. However, real landing gear is costly and cannot be reused after testing, while the testing accuracy and reliability of simplified fixtures are insufficient to meet the stringent testing requirements of modern aircraft. With the application of composite materials and new processes, landing gear structures are becoming increasingly complex, placing higher demands on the simulation accuracy and load-bearing capacity of testing equipment.
[0003] In existing technologies, aircraft ground testing typically uses either real landing gear or a simple steel welded frame structure. However, while using real landing gear yields the most accurate data, it is also costly. Conversely, using a simple steel welded frame structure, while low-cost, cannot simulate real stress conditions, thus affecting the aircraft ground testing.
[0004] Regarding the aforementioned technologies, existing technologies cannot guarantee testing accuracy while controlling costs, making it difficult to accurately simulate the multi-directional stress state of the landing gear, resulting in insufficient structural strength and durability, thus affecting the ground testing of aircraft. Summary of the Invention
[0005] To address the problem that it is impossible to ensure testing accuracy while controlling costs, resulting in difficulty in accurately simulating the multi-directional stress state of the landing gear, insufficient structural strength and durability, and thus affecting the ground testing of aircraft, this application provides a landing gear dummy structure.
[0006] This application provides a landing gear dummy structure, which adopts the following technical solution: A landing gear dummy structure includes a dummy body with an upper sleeve and a lower sleeve connected to its two ends. An upper sleeve shaft is inserted into the upper sleeve, and the upper sleeve shaft is provided with a fixing pin for fixing the upper sleeve shaft to the upper sleeve. A side support rod is provided on one side of the dummy body. A side support rod adapter for connecting the dummy body to the side support rod is provided at the upper middle position of the dummy body. The end of the side support rod adapter away from the side support rod passes through the dummy body and is connected to a connecting structure. The side of the connecting structure close to the dummy body is fixedly connected to the dummy body. A rotatable lower sleeve shaft is inserted into the lower sleeve. A vertical and lateral loading joint is connected to the end of the lower sleeve shaft that passes through the lower sleeve. The vertical and lateral loading joints are provided with a fixing structure for fixing the vertical and lateral loading joints to the lower sleeve shaft. A yaw loading joint is provided on the end of the lower sleeve shaft that connects to the vertical and lateral loading joints.
[0007] By adopting the above technical solution, a fixing pin is used to fix the upper sleeve shaft to the upper sleeve to prevent slippage; the side support rod adapter is used to connect the side support rod to the dummy body and allow rotation at the joint to simulate a ball bearing connection; the vertical and lateral loading joints are used to apply vertical and lateral loads; the yaw loading joint is used to apply the aircraft's yaw load, and can apply vertical, lateral, and yaw forces independently or in combination, simulating the "static load," "dynamic load," and "compound load" (such as rotation + lateral force) of mechanical components. There is no need to replace the joints or structures separately for loading in different directions. At the same time, the fixed positioning of the top upper sleeve shaft and the force input of the bottom loading joint form a "reference-loading" closed loop, ensuring that the loading force can be accurately applied to the target area of the dummy body, reducing test data errors caused by positioning deviations. Thus, the landing gear dummy structure can be used to replace the real structure for test load application and transmission.
[0008] Preferably, the connecting structure includes an annular plate and a rotating cylinder. The annular plate is fixedly connected to the dummy body on the side near the dummy body, and rotatably connected to the rotating cylinder on the side near the dummy body. The rotating cylinder is threaded with a threaded post, and the side support rod adapter is fixed to the rotating cylinder through the threaded post.
[0009] By adopting the above technical solution, the annular plate is directly fixed to the dummy body. Its annular structure can evenly distribute the force transmitted by the side support rod to the circumferential surface of the dummy body, avoiding excessive stress at a single connection point that could lead to cracking. The side support rod adapter is rigidly fixed to the rotating cylinder through a threaded column (the threaded connection has self-locking properties), ensuring that the supporting force borne by the side support rod can be stably transmitted to the dummy body through the path of adapter → threaded column → rotating cylinder → annular plate, reducing loss or offset during force transmission and preventing the side support rod from loosening under dynamic working conditions such as vibration and impact.
[0010] Preferably, the side support rod adapter is provided with bolts and nuts for fixing the side support rod, and the end of the side support rod near the side support rod adapter is snapped onto the side support rod adapter by bolts and nuts.
[0011] By adopting the above technical solution, after the bolt passes through the corresponding holes of the side support rod and the side support rod adapter, the nut is tightened to form a "rigid clamp", which firmly locks the side support rod and the adapter. There is almost no relative displacement between the two. This fixing method can ensure that the lateral support force borne by the side support rod (such as the reverse thrust to resist tipping and the shear force to offset the load) is completely transmitted to the adapter, and then diffused to the dummy body through the connection structure, avoiding "force transmission loss" caused by loose connection.
[0012] Preferably, the fixing structure includes a locking block and a threaded pin, the threaded pin being threadedly connected to the vertical and lateral loading joints, the top of the threaded pin being rotatably connected to the locking block, and the lower sleeve shaft having a slot for cooperating with the locking block.
[0013] By adopting the above technical solution, the "concave-convex fit" mechanical interlocking structure of the locking block and the locking groove is used. When the threaded nail is tightened, the locking block is embedded in the locking groove to form a rigid lock. This can simultaneously limit the relative displacement of the vertical and lateral loading joint and the lower sleeve shaft in the circumferential (rotation direction) and axial (length direction). Compared with simple frictional fixing (such as bolt tightening), this physical interlocking method can transmit loads more reliably, avoid force transmission loss caused by slippage, and ensure that the vertical and lateral loading forces are accurately applied to the lower sleeve shaft.
[0014] Preferably, the inner wall of the vertical and lateral loading joint is provided with a placement groove for placing the block, and the placement groove is also used for moving the block. The placement groove corresponds to the slot on the lower sleeve shaft.
[0015] By adopting the above technical solution and setting the placement groove, a dedicated receiving space can be provided for the card block, allowing the card block to be completely embedded in the inner wall of the vertical and lateral loading joint, rather than protruding from the surface of the vertical and lateral loading joint or occupying the sleeve space between it and the lower sleeve shaft. This makes the connection structure between the vertical and lateral loading joint and the lower sleeve shaft more compact, effectively preventing the card block from colliding and interfering with other components. At the same time, the placement groove can guide the movement of the card block, preventing the card block from tilting, rotating or jamming due to uneven force, thereby avoiding affecting the fit between the card block and the slot.
[0016] Preferably, the azimuth loading joint is threaded with a fixing post for fixing the azimuth loading joint, and both the azimuth loading joint and the lower sleeve shaft are provided with threaded grooves that cooperate with the fixing post. The azimuth loading joint and the lower sleeve shaft are fixed by the cooperation of the fixing post and the threaded groove.
[0017] By adopting the above technical solution, the fixed column forms a threaded connection with the threaded grooves on both the azimuth loading joint and the lower sleeve shaft. This "one column connecting two bodies" design makes the two form a rigid whole, which can effectively limit the relative displacement of the azimuth loading joint and the lower sleeve shaft in the axial and circumferential directions. This allows the load borne by the azimuth loading joint to be directly transmitted to the lower sleeve shaft through the fixed column. The force transmission path is short and direct, avoiding energy loss caused by multi-stage transmission. This ensures that the azimuth loading force can be accurately applied to the lower sleeve shaft, improving the accuracy of the test data.
[0018] Preferably, the azimuth loading joint and the vertical and lateral loading joints are provided with gaskets, which are sleeved on the lower sleeve shaft.
[0019] By adopting the above technical solution, and by setting shims, the shims can fill the gaps between the vertical and lateral loading joints and the axial loading joints through their own elasticity or thickness compensation. This makes the connection between the vertical and lateral loading joints and the axial loading joints and the lower sleeve shaft tighter, reducing axial or radial movement caused by gaps. This can prevent the connecting parts from becoming loose or worn due to long-term shaking.
[0020] Preferably, a first reinforcing rib is provided between the lower sleeve and the dummy body. The first reinforcing rib is in the shape of a right triangle, and the two right-angled sides of the first reinforcing rib are fixedly connected to the lower sleeve and the dummy body, respectively.
[0021] By adopting the above technical solution and setting the first reinforcing rib of a right-angled triangle, the connection rigidity between the lower sleeve and the dummy body can be strengthened, effectively resisting the deformation trend. The vertical and lateral loads borne by the lower sleeve can be evenly transferred to the dummy body through the two right-angled sides, avoiding the load concentration at the connection between the two and greatly reducing the risk of local stress overload.
[0022] Preferably, a second reinforcing rib is connected to the surface of the lower sleeve, and the second reinforcing rib is distributed on the surface of the lower sleeve.
[0023] By adopting the above technical solution and setting distributed second reinforcing ribs, it is equivalent to adding "rigid support strips" to the surface of the cylinder wall. This can evenly distribute the locally concentrated load along the direction of the ribs to the entire surface of the lower sleeve, avoiding permanent deformation caused by local stress exceeding the yield strength of the material.
[0024] Preferably, the upper and lower sleeves are connected to the dummy body by welding.
[0025] By adopting the above technical solution, welding can directly bond the end face of the sleeve to the main body of the dummy part without any additional protrusions or openings, which can maximize the compression of the structural volume and adapt to the design requirements of miniaturization and compactness.
[0026] In summary, this application includes at least one of the following beneficial technical effects: It can apply vertical, lateral, and yaw forces independently or in combination, and can simulate the "static load", "dynamic load" and "composite load" of mechanical components. With the fixed positioning of the top sleeve shaft and the force input of the bottom loading joint, it forms a "baseline-loading" closed loop, ensuring that the loading force can be accurately applied to the target area of the dummy body, reducing test data errors caused by positioning deviations. Thus, the landing gear dummy structure can be used to replace the real structure for test load application and transmission. The bolt and nut fixing scheme secures the side support rod to the side support rod adapter by means of bolts and nuts at one end of the side support rod. This "bolt + nut" fixing scheme ensures connection reliability with "rigid force transmission + anti-loosening", improves operational flexibility with "easy disassembly and assembly + angle fine adjustment", reduces adaptation costs with "multi-specification compatibility", and optimizes maintenance economy with "partial repair + universal consumables". The fixing structure consists of a locking block, a locking slot, and a threaded pin. This "locking block + threaded pin + locking slot" fixing scheme achieves high reliability of connection through the dual protection of mechanical interlocking and thread self-locking. The rotation operation and multi-angle adjustment achieve convenient operation and scene adaptability. At the same time, the compact structure and low-damage design optimize the life of components and space utilization. Attached Figure Description
[0027] Figure 1 This is a three-dimensional front view of the landing gear dummy structure; Figure 2 This is a rear-view 3D structural diagram of the landing gear dummy structure; Figure 3 This is an exploded view of the landing gear dummy structure; Figure 4 This is a 3D diagram of the fit between the side strut and the side strut adapter. Figure 5 This is a three-dimensional view of the structure of the lower sleeve shaft fitting with the vertical and lateral loading joints and the yaw loading joint; Figure 6 It is a sectional perspective view of the structure in which the lower sleeve shaft mates with the vertical and lateral loading joints and the yaw loading joint; Figure 7 It is a three-dimensional diagram of the structure of the dummy part body in conjunction with the upper and lower sleeves.
[0028] Reference numerals: 1. Dummy body; 2. Upper sleeve; 3. Lower sleeve; 4. Upper sleeve shaft; 5. Fixing pin; 6. Side support rod; 7. Side support rod adapter; 8. Connecting structure; 8-1. Annular plate; 8-2. Rotating cylinder; 8-3. Threaded post; 9. Lower sleeve shaft; 10. Vertical and lateral loading joints; 10-1. Placement groove; 11. Fixing structure; 11-1. Locking block; 11-2. Threaded nail; 11-3. Locking groove; 12. Heading loading joint; 12-1. Fixing post; 12-2. Threaded groove; 13. Bolt; 14. Nut; 15. Washer; 16. First reinforcing rib; 17. Second reinforcing rib. Detailed Implementation
[0029] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail.
[0030] This application discloses a landing gear dummy structure.
[0031] Reference Figure 1 , Figure 2 and Figure 3 A landing gear dummy structure mainly includes a dummy body 1, an upper sleeve 2, an upper sleeve shaft 4, a fixing pin 5 for fixing the upper sleeve shaft 4, a lower sleeve 3, a side support rod 6, a side support rod adapter 7, a connecting structure 8, a lower sleeve shaft 9, a vertical and lateral loading joint 10, a fixing structure 11, a gasket 15, and a yaw loading joint 12; The main body of the dummy component 1 serves as the basic frame of the landing gear dummy component. By welding with the upper and lower sleeves 3 and connecting with components such as the side strut adapter 7, the various parts of the dummy component are assembled into a whole. It can simulate the main structure of the real landing gear, bear and transmit various loads from different parts of the landing gear, and ensure the integrity of the overall structure of the dummy component and the accuracy of the force transmission path. Upper sleeve 2: The inner diameter of the upper sleeve 2 is usually matched with the size of the landing gear related shaft components. After it is welded to the dummy body 1, it can play a positioning and support role for the upper sleeve shaft 4 inserted therein, just like the position limitation function of the corresponding structure of the real landing gear on the related rotating shaft and other components, ensuring that the upper sleeve shaft 4 is fixed in position, and providing a reference for the movement of other parts of the dummy and the transmission of loads. Upper sleeve shaft 4: After being inserted into the upper sleeve 2, it is fixed by the fixing pin 5. It is a key component in the landing gear dummy that transmits some loads and motions. It can simulate some rotation or positioning functions of real landing gear shaft parts, so that the dummy can have similar motion or force transmission relationships to the real landing gear during the test. Fixed pin 5: By inserting into the corresponding pin holes of the upper sleeve 2 and the shaft 4, it prevents the upper sleeve shaft 4 from coming out of the sleeve or from rotating unexpectedly, ensuring the relative position between the shaft and the sleeve is stable, so that the shaft's related force transmission and motion functions can be reliably realized. Side strut 6: Side strut 6 is mainly used to lock the landing gear struts stably in the lowered position. During the test to simulate the aircraft landing process, it can withstand the corresponding ground impact load, similar to the real landing gear struts. When the landing gear is lowered, it allows the landing gear to withstand yaw and vertical loads. Its effect is to ensure the stability of the dummy landing gear in the lowered state and to simulate the transmission of some ground impact loads, making the test closer to the real situation. Side strut adapter 7: After being connected to the side strut 6 by bolt 13, it is fitted to the dummy body 1 with the connecting structure 8. Its function is to realize a reliable connection and angle adaptation between the side strut 6 and the dummy body 1, so that the side strut 6 can be installed on the dummy in a predetermined manner, thereby ensuring that the side strut 6 can perform its constraint and force transmission functions normally. Lower sleeve 3: Similar to upper sleeve 2, it is the mounting base for lower sleeve shaft 9. It is welded to the dummy body 1 and provides support and guidance for lower sleeve shaft 9. It can ensure that lower sleeve shaft 9 is stable in position when subjected to vertical and lateral loads and achieve accurate load transfer. Lower sleeve shaft 9: Inserted into the lower sleeve 3, and vertical, lateral and yaw loading joints 12 are all installed on this shaft. It is mainly used to bear the yaw, vertical and lateral loads from the loading joints and to transfer these loads to the lower sleeve 3 and the dummy body 1 to simulate the working conditions of landing gear wheel axles and other components bearing ground forces in different directions. Vertical and lateral loading joints 10: The vertical loading joint receives the force of the loading device vertically from below the dummy and is fixed to the lower sleeve shaft 9 by the fixing structure 11, so that it simulates the aircraft landing gear bearing the vertical support force or impact force from the ground; the lateral loading joint connects the loading device horizontally to simulate the lateral force on the landing gear when the aircraft turns on the ground or is subjected to crosswinds. Their effect is to allow the dummy to accurately simulate the landing gear bearing real vertical and lateral loads, which is convenient for experimental research; Shim 15: Generally installed between the loading joint and the lower sleeve shaft 9, it can be used to adjust the gap of the loading joint installation position, to compensate for dimensional errors, to evenly distribute the load pressure, to prevent damage to the loading joint installation due to stress concentration, and to make the installation of the loading joint more stable and reliable. Heading Loading Joint 12: It mainly connects the loading equipment in the heading direction to simulate the heading force on the landing gear during aircraft taxiing, braking and other processes. It can apply accurate heading load to the landing gear dummy, so that the test can study the heading load and force transmission characteristics of the landing gear dummy.
[0032] Through the above scheme, the fixing pin 5 is used to fix the upper sleeve shaft 4 to the upper sleeve 2 to prevent the upper sleeve shaft 4 from slipping; the side support rod adapter 7 is used to connect the side support rod 6 to the dummy body 1 and allow the joint to rotate to simulate the ball bearing connection; the vertical and lateral loading joint 10 is used to apply vertical and lateral loads; the yaw loading joint 12 is used to apply the yaw load of the aircraft, and can apply vertical, lateral and yaw forces independently or in combination. It can simulate the "static load", "dynamic load" and "composite load" of mechanical components, such as rotation + lateral force, without the need to replace the joint or structure separately for loading in different directions. It simulates the landing gear test and ensures that the loading force can be accurately applied to the target area of the dummy body 1, reducing the test data error caused by positioning deviation. Thus, the landing gear dummy structure can be used to replace the real structure for test load application and transmission.
[0033] refer to Figure 4 The connecting structure 8 includes an annular plate 8-1 and a rotating cylinder 8-2. The annular plate 8-1 is fixedly connected to the dummy body on the side closest to the dummy body, and the rotating cylinder 8-2 is rotatably connected to the annular plate 8-1 on the side closest to the annular plate 8-1, so that the rotating cylinder 8-2 can rotate on the annular plate 8-1. The side support rod adapter 7 passes through one end of the dummy body 1 and is connected to the rotating cylinder 8-2, so that the side support rod adapter 7 and the rotating cylinder 8-2 can rotate on the dummy body 1. The rotating cylinder 8-2 is threadedly connected to a threaded post 8-3, and the threaded post 8-3 is connected and fixed to the side support rod adapter 7 through the thread, so that the side support rod adapter 7 and the rotating cylinder 8-2 are connected and fixed.
[0034] By adopting the above scheme, the side support rod adapter 7 can rotate with the side support rod 6, avoiding affecting the working requirements of the side support rod 6. At the same time, it ensures that the supporting force borne by the side support rod 6 can be stably transmitted to the dummy body 1 through the path of adapter → threaded column 8-3 → rotating cylinder 8-2 → annular plate 8-1, reducing the loss or offset in the force transmission process, and preventing the side support rod 6 from loosening under dynamic working conditions such as vibration and impact.
[0035] refer to Figure 5 and Figure 6The fixing structure 11 includes a locking block 11-1 that checks the threaded pin 11-2. The end of the locking block 11-1 near the threaded pin 11-2 is rotatably connected to the threaded pin 11-2, allowing the threaded pin 11-2 to rotate. The locking block 11-1 is located inside the vertical and lateral loading joint 10, and the threaded pin 11-2 is threadedly connected to the vertical and lateral loading joint 10. A groove 11-3 is formed on the surface of the lower sleeve shaft 9 to cooperate with the locking block 11-1. By rotating the threaded pin 11-2, the locking block 11-1 is locked in the groove 11-3, thereby fixing the vertical and lateral loading joint 10 and the lower sleeve shaft 9, limiting the relative displacement of the vertical and lateral loading joint 10 and the lower sleeve shaft 9 in the axial and circumferential directions, reliably transmitting loads, avoiding force transmission loss caused by slippage, and ensuring that the vertical and lateral loading joint 10 accurately acts on the lower sleeve shaft 9.
[0036] refer to Figure 6 The vertical and lateral loading joints 10 are provided with placement grooves 10-1, which are used for placing and limiting the movement of the locking block 11-1. During installation, the placement groove 10-1 is aligned with the locking groove 11-3 on the lower sleeve shaft 9, so that the locking block 11-1 can enter the locking groove 11-3. The placement groove 10-1 provides a dedicated space for the locking block 11-1, avoiding collision interference during the installation of the vertical and lateral loading joints 10, and making the connection between the vertical and lateral loading joints 10 and the lower sleeve shaft 9 more compact.
[0037] refer to Figure 6 The azimuth loading joint 12 is threaded with two fixing posts 12-1, which are symmetrically distributed on the azimuth loading joint 12. The azimuth loading joint 12 and the lower sleeve shaft 9 are provided with threaded grooves 12-2 that cooperate with the fixing posts 12-1. The azimuth loading joint 12 is fixedly connected to the lower sleeve shaft 9 through the cooperation of the fixing posts 12-1 and the threaded grooves 12-2, so that the two form a rigid whole. This can effectively limit the relative displacement of the azimuth loading joint 12 and the lower sleeve shaft 9 in the axial and circumferential directions, avoid the loss caused by multi-stage transmission, and ensure that the azimuth loading force can be accurately applied to the lower sleeve shaft 9.
[0038] refer to Figure 7 A first reinforcing rib 16 is provided between the lower sleeve 3 and the dummy body 1. The first reinforcing rib 16 is in the shape of a right triangle. The two right-angled sides of the first reinforcing rib 16 are fixed to the lower sleeve 3 and the dummy column respectively by welding. The first reinforcing rib 16 strengthens the connection between the dummy body 1 and the lower sleeve 3, so that the vertical and lateral loads borne by the lower sleeve 3 are evenly transferred to the dummy body 1 through the two right-angled sides, avoiding the load concentration at the connection between the two and greatly reducing the risk of local stress overload.
[0039] The surface of the lower sleeve 3 is also connected with a second reinforcing rib 17, and there are three second reinforcing ribs 17. The second reinforcing ribs 17 are distributed on the surface of the lower sleeve 3, and the side of the second reinforcing rib 17 closest to the dummy body 1 is welded and fixed to the dummy body 1. Through the distributed second reinforcing ribs 17, it is equivalent to adding a "rigid support strip" to the surface of the cylinder wall, which can evenly distribute the locally concentrated load along the direction of the rib to the entire surface of the lower sleeve 3, and avoid permanent deformation caused by local stress exceeding the yield strength of the material.
[0040] The implementation principle of this application embodiment is as follows: In implementation, directional loads, vertical loads, and lateral loads are applied to the directional loading joint 12 and the vertical and lateral loading joints 10. The directional loading joint 12 and the vertical and lateral loading joints 10 transmit the loads to the upper sleeve shaft 4, the upper sleeve shaft 4 transmits the loads to the upper sleeve 2, the upper sleeve 2 transmits the loads to the dummy body 1, the dummy body 1 transmits the loads to the side support rod adapter 7, and the side support rod adapter 7 transmits the loads to the side support rod 6 connected to the side support rod adapter 7, causing the side... The strut 6 transfers the load to the aircraft, locking the dummy body 1 in the lowered position. During the simulated aircraft landing process, the side strut 6 bears the corresponding ground impact load, similar to the real landing gear strut when the landing gear is lowered. This allows the dummy landing gear to withstand lateral and vertical loads, ensuring the stability of the dummy landing gear in the lowered state and simulating the transfer of some ground impact loads, making the test closer to the real situation. This allows it to replace the real landing gear for test simulation, reducing costs and meeting the experimental data requirements.
[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A landing gear dummy structure, characterized in that, The device includes a dummy body (1), with an upper sleeve (2) and a lower sleeve (3) connected to its two ends respectively. An upper sleeve shaft (4) is inserted into the upper sleeve (2), and the upper sleeve shaft (4) is provided with a fixing pin (5) for fixing the upper sleeve shaft (4) to the upper sleeve (2). A side support rod (6) is provided on one side of the dummy body (1), and a side support rod adapter (7) for connecting the dummy body (1) and the side support rod (6) is provided at a position slightly above the middle of the dummy body (1). The end of the side support rod adapter (7) away from the side support rod (6) passes through the dummy body (1) and connects to the side support rod (6). There is a connecting structure (8), which is fixedly connected to the dummy body (1) on the side near the dummy body (1). A rotatable lower sleeve shaft (9) is inserted inside the lower sleeve (3). A vertical and lateral loading joint (10) is connected to one end of the lower sleeve shaft (9) that passes through the lower sleeve (3). A fixing structure (11) for fixing the vertical and lateral loading joint (10) to the lower sleeve shaft (9) is provided on the vertical and lateral loading joint (10). A heading loading joint (12) is provided on one end of the lower sleeve shaft (9) that connects to the vertical and lateral loading joint (10).
2. The landing gear dummy structure according to claim 1, characterized in that, The connecting structure (8) includes an annular plate (8-1) and a rotating cylinder (8-2). The annular plate (8-1) is fixedly connected to the dummy body (1) on the side near the dummy body (1). The annular plate (8-1) is rotatably connected to the rotating cylinder (8-2) on the side near the dummy body (1). The rotating cylinder (8-2) is threaded with a threaded post (8-3). The side support rod adapter (7) is fixed to the rotating cylinder (8-2) through the threaded post (8-3).
3. The landing gear dummy structure according to claim 1, characterized in that, The side support rod adapter (7) is provided with bolts (13) and nuts (14) for fixing the side support rod (6). The side support rod (6) is connected to the side support rod adapter (7) at one end near the side support rod adapter (7) by bolts (13) and nuts (14).
4. The landing gear dummy structure according to claim 1, characterized in that, The fixing structure (11) includes a locking block (11-1) and a threaded pin (11-2). The threaded pin (11-2) is threadedly connected to the vertical and lateral loading joint (10). The top of the threaded pin (11-2) is rotatably connected to the locking block (11-1). The lower sleeve shaft (9) is provided with a slot (11-3) that cooperates with the locking block (11-1).
5. The landing gear dummy structure according to claim 4, characterized in that, The vertical and lateral loading joint (10) has a placement groove (10-1) for placing the locking block (11-1) on its inner wall, and the placement groove (10-1) is also used for moving the locking block (11-1). The placement groove (10-1) corresponds to the locking groove (11-3) on the lower sleeve shaft (9).
6. The landing gear dummy structure according to claim 1, characterized in that, The heading loading joint (12) is threaded with a fixing post (12-1) for fixing the heading loading joint (12). Both the heading loading joint (12) and the lower sleeve shaft (9) are provided with threaded grooves (12-2) that cooperate with the fixing post (12-1). The heading loading joint (12) and the lower sleeve shaft (9) are fixed by the cooperation of the fixing post (12-1) and the threaded groove (12-2).
7. The landing gear dummy structure according to claim 1, characterized in that, The azimuth loading joint (12) and the vertical and lateral loading joints (10) are provided with gaskets (15), which are sleeved on the lower sleeve shaft (9).
8. The landing gear dummy structure according to claim 1, characterized in that, A first reinforcing rib (16) is provided between the lower sleeve (3) and the dummy body (1). The first reinforcing rib (16) is a right triangle in shape, and the two right-angled sides of the first reinforcing rib (16) are fixedly connected to the lower sleeve (3) and the dummy body (1) respectively.
9. The landing gear dummy structure according to claim 1, characterized in that, The lower sleeve (3) is connected to a second reinforcing rib (17), which is distributed on the surface of the lower sleeve (3).
10. The landing gear dummy structure according to claim 1, characterized in that, The upper sleeve (2) and lower sleeve (3) are connected to the dummy body (1) by welding.