A test fixture for securing a high strut landing gear to a test bed

Abstract

The application discloses a test fixture for fixing a high-strut landing gear on a test bed, and belongs to the field of aviation landing gear testing. The test fixture comprises a bearing plate assembly, a side support assembly, a joint assembly and a front support assembly. The bearing plate assembly is provided with the joint assembly on one side, and is used for connecting a retracting assembly of the landing gear and a butt joint lock shell. The top end of the bearing plate assembly is connected with the test bed. Two groups of the side support assemblies are arranged on the side walls of the bearing plate assembly, and the top surfaces of the side support assemblies are fixedly connected with the bottom surface of the test bed. The front support assembly is arranged on one side of the upper end of the bearing plate assembly, and is used for connecting a heading support rod of the high-strut landing gear. The joint assembly and the front support assembly are matched to vertically arrange the high-strut landing gear on one side of the bearing plate assembly. The test fixture can simulate the mounting environment of the high-strut landing gear and the fuselage, and is used for carrying out laboratory integrated testing on an aircraft landing gear system, a wheel brake and a brake control subsystem, so that the problem that laboratory integrated testing of various systems cannot be realized in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of aircraft landing gear test, and particularly relates to a test fixture for fixing a high-strut landing gear on a test bench. BACKGROUND

[0002] The aircraft landing gear system, the wheel brake, and the brake control subsystem are related to the safety of take-off and landing of the aircraft, and are important systems of the aircraft. For a long time, the above products are divided according to professional fields in domestic ground test, and the landing gear system, the wheel brake, and the brake control subsystem are tested separately in the test room, and the system integration test is usually verified on the aircraft. The mode of independent test of each system is difficult to make the performance of the integrated system optimal, and it is also difficult to find the matching problem of the aircraft landing gear system, the wheel brake, and the brake control subsystem in the ground test stage.

[0003] With the continuous improvement of the performance of the aircraft, the requirements for each system are increasingly improved, and the demand for integrated test is more obvious, especially for the landing gear with high-strut structure, which is more likely to occur walking phenomenon and resonance phenomenon with the wheel brake during braking. If the aircraft landing gear system, the wheel brake, and the brake control subsystem can be integrated for testing, the matching can be fully verified, the development risk can be reduced, the development cost can be saved, and the overall test level of the aircraft can be improved. However, due to the structural characteristics of the small installation space of the high-strut landing gear, it is difficult to fix the high-strut landing gear on the test bench for integrated test, a large number of auxiliary fixtures for fixing the landing gear are needed, and the positioning during installation is difficult. Therefore, it is necessary to design a test fixture for fixing the high-strut landing gear on the test bench. SUMMARY

[0004] The technical problem to be solved is that in order to avoid the shortcomings of the prior art, the present application provides a test fixture for fixing a high-strut landing gear on a test bench, which can simulate the installation environment of the high-strut landing gear and the fuselage, and can be used for integrated test of the aircraft landing gear system, the wheel brake, and the brake control subsystem in the test room by fixing the high-strut landing gear on the test fixture and then installing the test fixture on the test bench. The present application solves the problems that independent test of each system cannot achieve optimal matching of each system and integrated test of each system in the test room.

[0005] The technical solution of the present application is a test fixture for fixing a high-strut landing gear on a test bench, which comprises a bearing plate assembly, a side support assembly, a joint assembly, and a front support assembly.

[0006] The bearing plate assembly serves as the main body of the fixture, and a joint assembly is installed on one side of the bearing plate assembly; the joint assembly is used for connecting a retracting and deploying assembly of the high-strut landing gear and a docking lock shell; and the top end of the bearing plate assembly is connected to the test bench through a top support.

[0007] The two sets of side support assemblies are installed on the side wall of the bearing plate assembly, symmetrically located on both sides of the joint assembly, and the top surface of the side support assembly is fixedly connected to the bottom surface of the test bench;

[0008] The front support assembly is installed on one side of the upper end of the bearing plate assembly and is used to connect the yaw strut of the high strut landing gear;

[0009] The joint assembly and the front support assembly work together to vertically install the high strut landing gear on one side of the load-bearing plate assembly; the top support and side support assemblies are used to transfer the test bench load; the load-bearing plate assembly and the front support assembly respectively bear the braking torque and yaw torque during the test.

[0010] A further technical solution of the present invention is as follows: the bearing plate assembly includes two bearing plates with identical structures and multiple bearing ribs; the two bearing plates are arranged in parallel alignment and are referred to as the bearing front plate and the bearing rear plate; the multiple bearing ribs intersect each other to form a frame-type reinforcing rib and are fixed between the two bearing plates by fasteners; a reinforcing block is horizontally fixed to the top of the frame-type reinforcing rib, the upper end face of the reinforcing block is flush with the top of the two bearing plates, and its two sides are fixedly connected to the two bearing plates respectively; its top surface is provided with threaded holes for fixing the top support.

[0011] A further technical solution of the present invention is: the top support has mounting surfaces at different horizontal planes at both ends, one mounting surface is fixedly connected to the reinforcing block, and the other mounting surface is fixedly connected to the bottom surface of the test bench.

[0012] A further technical solution of the present invention is: the front support assembly includes a front support plate and a yaw strut joint, one end of the front support plate is horizontally fixed between the bearing front plate and the bearing rear plate, and the other end is fixed with a yaw strut joint; the yaw strut joint and the joint assembly are located in the same plane, and the yaw strut joint is used to connect the yaw strut of the high strut landing gear.

[0013] A further technical solution of the present invention is as follows: the connector assembly includes a universal joint connector, a retraction bracket connector, a retraction support rod connector, a vertical strut connector, and a lower locking connector. Each connector is fixed to the outer side wall of the bearing front plate of the bearing plate assembly. The universal joint connector, the retraction bracket connector, and the retraction support rod connector are used to connect with the retraction assembly of the high strut landing gear. The vertical strut connector and the two lower locking connectors are used to connect with the docking lock housing of the high strut landing gear.

[0014] Further technical solutions of the present application are: the universal joint, the folding support joint, the folding support rod joint, the vertical support rod joint, the lower lock joint, and the heading support rod joint are all provided with mounting lugs, and are fixedly connected with corresponding interfaces on the high strut landing gear through fasteners; the relative positions of the joints and the angles of the connecting lugs on the joints are all matched with the folding assembly, the butt joint lock shell, and the heading support rod of the high strut landing gear, so as to simulate the installation environment of the folding assembly, the butt joint lock shell, and the heading support rod of the high strut landing gear on the aircraft fuselage.

[0015] Further technical solutions of the present application are: the side support assembly includes a side support plate and a connecting plate; the side support plate is in a right-angled triangle structure, one side of which is fixed with the connecting plate, and the connecting plate is used for fixedly connecting the side support plate and the two bearing plates; the other side of the side support plate is fixedly connected with the bottom surface of the test bench through a screw; the side support plate is provided with a support rod through slot for passing through the heading support rod of the high strut landing gear; and the side support assembly is installed outside the bearing front plate.

[0016] Further technical solutions of the present application are: a plurality of triangular reinforcing ribs are symmetrically and uniformly arranged on both sides of the side support plate, so as to improve the support strength of the side support assembly.

[0017] Further technical solutions of the present application are: a plurality of weight-reducing holes are uniformly arranged at the center positions of the bearing plates, and the side support plate is provided with a weight-reducing hole, so as to reduce the overall weight of the test fixture.

[0018] An application of the test fixture is: the installation sequence of the test fixture, the high strut landing gear, and the test bench is: first, the test fixture is assembled, then the assembly of the high strut landing gear is completed on the test fixture, and finally, the test fixture with the high strut landing gear is installed on the test bench.

[0019] Advantages

[0020] The present application has the advantages that: the structures and installation positions of the universal joint, the folding support joint, the folding support rod joint, the vertical support rod joint, the lower lock joint, and the heading support rod joint in the present application truly simulate the aircraft fuselage interface, the folding assembly, the butt joint lock shell, and the heading support rod of the high strut landing gear are connected with the corresponding joints on the test fixture, and then the test fixture is fixed with the test bench, so as to maximize the consistency of the installation state of the high strut landing gear with the outfield, to realize the integrated testing of the aircraft landing gear system, the wheel brake, and the brake control subsystem in the laboratory, to facilitate the discovery of the matching problems of each system in the ground test stage, to facilitate improvement, to ensure the best matching of each system, and to improve the test efficiency.

[0021] The test fixture of the present application adopts a split assembly structure, and each component is connected and assembled through fasteners, so as to reduce the requirement for the installation instrument capacity and improve the flexibility of storage and transfer of the test fixture.

[0022] Compared with the prior art, the test fixture of the application realizes integrated testing while facilitating installation and use, and has the characteristics of high installation positioning accuracy. The structure of the application first fixes and connects each joint of the landing gear and the test fixture, and then fixes the test fixture with the landing gear to the test bench, which facilitates the positioning and installation of the high strut landing gear, can realize the rapid installation of the high strut landing gear with wheels on the test bench, ensures the docking accuracy of the landing gear and the test fixture, reduces the use demand for auxiliary tool fixtures in the high strut landing gear test installation process, and simplifies the installation steps.

[0023] The bearing plate assembly of the application is composed of two bearing plates and a plurality of bearing ribs fixed between the two bearing plates, which not only ensures the support strength requirement of the high strut landing gear and meets the bearing moment requirement, but also has the effect of lightweight. At the same time, the design of the weight reduction holes of the bearing plate and the weight reduction holes of the side support plate maximizes the lightweight of the test fixture. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the installation schematic diagram of the test fixture of the application and the high strut landing gear and the test bench;

[0025] Figure 2 is the overall structure schematic diagram of the test fixture of the application;

[0026] Figure 3 is the schematic diagram of the position of each joint in the test fixture of the application;

[0027] Figure 4 is the schematic diagram of the joint structure of the universal joint of the application;

[0028] Figure 5 is the schematic diagram of the joint structure of the retractable support of the application;

[0029] Figure 6 is the schematic diagram of the joint structure of the retractable support rod of the application;

[0030] Figure 7 is the schematic diagram of the joint structure of the vertical support rod of the application;

[0031] Figure 8 is the schematic diagram of the joint structure of the heading support rod of the application;

[0032] Figure 9 is the schematic diagram of the joint structure of the lower lock of the application;

[0033] Figure 10 is the connection schematic diagram of the high strut landing gear and the test fixture of the application;

[0034] Figure 11 is the connection schematic diagram of the retractable assembly of the high strut landing gear and the test fixture of the application;

[0035] Figure 12 The schematic diagram of the connection between the docking lock shell of the high strut landing gear and the test fixture of the present application;

[0036] Figure 13 The schematic diagram of the connection between the heading support rod of the high strut landing gear and the test fixture of the present application;

[0037] Figure 14 The schematic diagram of the structure of the load plate assembly of the present application;

[0038] Figure 15 The schematic diagram of the frame type reinforcing rib structure composed of multiple load bars in the load plate assembly of the present application;

[0039] Figure 16 The schematic diagram of the reinforcing block structure of the present application;

[0040] Figure 17 The schematic diagram of the structure of the side support assembly of the present application;

[0041] Figure 18 The schematic diagram of the top support structure of the present application;

[0042] Figure 19 The schematic diagram of the front support plate structure of the present application.

[0043] Legend: 1. Load plate assembly, 11. Load front plate, 12. Load rear plate, 13. Load bar, 131. Bar threaded hole, 14. Reinforcing block, 141. Top support mounting hole, 142. Side hole; 2. Side support assembly, 21. Side support plate, 211. Support rod through slot, 212. Side support top through hole, 22. Connecting plate, 23. Triangular reinforcing rib; 3. Joint assembly, 31. Universal joint, 32. Retractable support bracket joint, 33. Retractable support rod joint, 34. Vertical support rod joint, 35. Lower lock joint; 4. Front support assembly, 41. Front support plate, 411. Front support plate fixing hole, 412. Heading support rod joint mounting hole, 42. Heading support rod joint; 5. Top support, 51. Top support upper mounting surface through hole, 52. Top support lower mounting surface through hole; 6. High strut landing gear, 61. Retractable assembly, 62. Docking lock shell, 63. Heading support rod; 7. Test bench. DETAILED DESCRIPTION

[0044] The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0046] Referring to Figure 1 The test fixture described in the present application is used to fix the high strut landing gear 6 to the interface of the test test bed 7, and is used for laboratory integrated testing of aircraft landing gear systems, wheel brakes, and brake control subsystems.

[0047] Referring to Figures 1-3 The test fixture described in the present application for fixing the high strut landing gear to the test bed comprises a bearing plate assembly 1, a side support assembly 2, a joint assembly 3, and a front support assembly 4. The bearing plate assembly 1 serves as the main body of the fixture, and is used to install other assemblies and fixedly connected to the test bed 7. The bearing plate assembly 1 is provided with a joint assembly 3 on one side, and the joint assembly 3 is used to connect the retracting assembly 61 and the docking lock shell 62 of the high strut landing gear 6, and to vertically fix the high strut landing gear 6 to one side of the bearing plate assembly 1. The top end of the bearing plate assembly 1 is connected to the test bed 7 through two top supports 5. Two sets of side support assemblies 2 are fixedly installed on the side walls of the bearing plate assembly 1, are installed on the same mounting surface as the joint assembly 3, and are symmetrically located on both sides of the joint assembly 3; the top surface of the side support assembly 2 is fixedly connected to the bottom surface of the test bed 7. The front support assembly 4 is installed on one side of the upper end of the bearing plate assembly 1, and is used to connect the heading support rod 63 of the high strut landing gear 6.

[0048] Referring to Figures 14-16The bearing plate assembly 1 comprises two bearing plates, a plurality of bearing ribs 13 and a reinforcing block 14. The two bearing plates are arranged in parallel and are respectively a bearing front plate 11 and a bearing rear plate 12. The plurality of bearing ribs 13 are crosswise arranged to form a frame reinforcing rib and are fixed between the two bearing plates by fasteners. Specifically, the bearing ribs 13 are vertically provided with a plurality of rib threaded holes 131 on the bearing ribs 13, and the two bearing plates are provided with through holes matching the rib threaded holes 131. The bearing front plate 11, the bearing ribs 13 and the bearing rear plate 12 are fixed and connected by bolts sequentially penetrating the through holes of the bearing front plate 11, the rib threaded holes 131 of the bearing ribs 13 and the through holes of the bearing rear plate 12 and fixed by nuts.

[0049] The top of the frame reinforcing rib formed by the plurality of bearing ribs 13 is horizontally fixed with the reinforcing block 14. The upper end surface of the reinforcing block 14 is flush with the top end of the two bearing plates, and the two sides thereof are fixedly connected with the two bearing plates. The top surface of the reinforcing block 14 is provided with threaded holes for fixing the top support 5. Specifically, the reinforcing block 14 is fixed on the top surface of the vertically arranged bearing rib 13 by screws. The reinforcing block 14 is vertically provided with two groups of through threaded side holes 142 on the two bearing plates. The two bearing plates are provided with through holes corresponding to the side holes 142. The two bearing plates and the reinforcing block 14 are fixed and connected by bolts and nuts. Another way of fixing the reinforcing block 14 and the two bearing plates is to weld the reinforcing block 14 and the bearing front plate 11, and then fix and connect them by screws from the bearing rear plate 12 into the side holes 142 of the reinforcing block 14. The top surface of the reinforcing block 14 is provided with two groups of top support mounting holes 141, which are threaded blind holes for mounting the top support 5 by screws.

[0050] Referring to Figure 18 The top support 5 is a stepped block Z-shaped structure, and the two ends thereof are provided with different horizontal mounting surfaces. One end mounting surface is a top support upper mounting surface, which is provided with a plurality of through holes 51 matching the one group of top support mounting holes 141 on the reinforcing block 14, and the top support 5 and the reinforcing block 14 are fixed and connected by screws. The other end mounting surface is a top support lower mounting surface, which is provided with through holes 52 matching the threaded holes on the bottom surface of the test bench 7, and the top support 5 and the test bench 7 are fixed and connected by screws.

[0051] Referring to Figure 3 , Figure 13 , Figure 19The front support assembly 4 includes a front support plate 41 and a yaw strut connector 42. One end of the front support plate 41 is a fixed end, which is fixedly connected to the load-bearing assembly 1. The other end of the front support plate 41 is a cantilever free end. The front support plate 41 is horizontally fixed to one side of the top of the load-bearing assembly 1. Specifically, the fixed end of the front support plate 41 is provided with a set of front support plate fixing holes 411. The fixed end is inserted between the load-bearing front plate 11 and the load-bearing rear plate 12. The corresponding two load-bearing plates are provided with through holes that match the front support plate fixing holes 411. The fixed end of the front support plate 41 is fixed between the two load-bearing plates by bolts and nuts. The free end of the front support plate 41 is provided with a set of yaw strut connector mounting holes 412. The yaw strut connector mounting holes 412 match the mounting holes on the yaw strut connector 42 for connecting the yaw strut connector 42. The yaw strut connector 42 is installed and fixed at the free end of the front support plate 41 by bolts and nuts. The yaw strut joint 42 and the joint assembly 3 are located on the same plane. The yaw strut joint 42 is used to connect the yaw strut 63 of the high strut landing gear 6.

[0052] See Figures 3-13 The connector assembly 3 includes a universal joint connector 31, a retractable bracket connector 32, a retractable support rod connector 33, a vertical strut connector 34, and two symmetrically arranged lower locking connectors 35. Each connector is fixed to the outer wall of the front bearing plate 11 of the bearing plate assembly 1 by bolts and nuts. Specifically, the bolts pass through the mounting holes in the bottom plates of each connector, through the front bearing plate 11 and the rear bearing plate 12, and are tightened with nuts. The universal joint connector 31, the retractable bracket connector 32, and the retractable support rod connector 33 in the connector assembly 3 are used to connect with the retractable assembly 61 of the high strut landing gear 6; the vertical strut connector 34 and the two lower locking connectors 35 in the connector assembly 3 are used to connect with the docking lock housing 62 of the high strut landing gear 6. Figure 3As shown, the center positions of the outer side walls of the bearing front plate 11 from top to bottom are in turn the universal joint 31, the folding support rod joint 33, and the vertical support rod joint 34, the geometric centers of the three joints are located on the same vertical line, the folding bracket joint 32 is located at the lower left of the universal joint 31, and the two lower lock joints 35 are located at the lower end of the outer side wall of the bearing front plate 11 and are symmetrically arranged relative to the vertical support rod joint 34. The universal joint 31, the folding bracket joint 32, the folding support rod joint 33, the vertical support rod joint 34, the lower lock joint 34, and the heading support rod joint 42 are all provided with protruding mounting lugs, and the lugs are all provided with pin holes perpendicular to the lugs. The lug of each joint is respectively connected with the folding assembly 61, the butt lock shell 62, and the heading support rod 63 of the high strut landing gear 6 through the pin. Among them, the universal joint 31 is provided with two parallel upper and lower lugs, the folding bracket joint 32 is provided with two parallel inclined lugs, and the rest of the joints are single-lug structures. The relative positions of the joints, the structure of the joints including single and double lug design, lug angle, double lug spacing design, and lug pin hole position design are matched with the mounting interfaces of the folding assembly 61, the butt lock shell 62, and the heading support rod 63 of the high strut landing gear 6 and the aircraft fuselage, achieving true simulation of the installation environment of the high strut landing gear 6 on the aircraft fuselage.

[0053] Referring to Figure 1 , Figure 13 , Figure 17 , the two groups of side support assemblies 2 are installed on the two sides of the outer wall surface of the bearing front plate 11, and the two groups of side support assemblies 2 are symmetrically arranged relative to the vertical installation center line of the universal joint 31, the folding support rod joint 33, and the vertical support rod joint 34. The side support assembly 2 includes a side support plate 21 and a connecting plate 22. The main body of the side support plate 21 is a right-angled triangle structure, one side of which is vertically faced to the bearing front plate 11. A connecting plate 22 is welded and fixed on the right-angled side, the connecting plate 22 is surface-fitted with the bearing front plate 11, and a plurality of mounting holes are arranged on the connecting plate 22 on both sides of the side support plate 21 for fixing and connecting the connecting plate 22 and the two bearing plates through bolts. Correspondingly, the two bearing plates are provided with through holes matched with the mounting holes on the connecting plate 22. A plurality of side support top through holes 212 are arranged on the plane of the other side of the right-angled side of the side support plate 21 for fixing and connecting with the bottom surface of the test bed 7 through screws. The side support plate 21 close to the front support assembly 4 is provided with a support rod through slot 211 for passing through the heading support rod 63 of the high strut landing gear 6, so that the installation interface end of the heading support rod 63 is connected with the heading support rod joint 42. In order to improve the support strength of the side support assembly 2, a plurality of triangular reinforcing ribs 23 are symmetrically and evenly arranged on both sides of the side support plate 21, and the two right-angled sides of the triangular reinforcing rib 23 are respectively welded and fixed with the side support plate 21 and the connecting plate 22.

[0054] Referring to Figure 14 , Figure 17In order to reduce the weight of the test fixture and facilitate the installation and use of the test fixture while ensuring the overall support strength of the test fixture, four square weight-reducing holes are arranged at the center positions of the bearing front plate 11 and the bearing rear plate 12, and the weight-reducing holes avoid the mounting positions of the joint assembly 3.

[0055] The test fixture is used in the following manner:

[0056] 1. First, the test fixture is assembled: the bearing plate assembly 1 is assembled, the front support assembly 4 is mounted on the bearing plate assembly 1, the two side support assemblies 2 are mounted on the bearing plate assembly 1, and finally, the joints of the joint assembly 3 are mounted on the bearing plate assembly 1, thereby completing the assembly of the test fixture.

[0057] 2. Then, the high strut landing gear 6 is assembled on the test fixture: the retractable assembly 61 of the high strut landing gear 6 is connected to the test fixture through the universal joint 31, the retractable support joint 32, and the retractable support rod joint 33, the docking lock shell 62 of the high strut landing gear 6 is connected with the vertical support rod joint 34 and the lower lock joint 35, the heading support rod 63 of the high strut landing gear 6 is docked with the heading support rod joint 42 through the support rod through slot 211 in the side support plate 21, and finally, the main shaft of the high strut landing gear 6 is connected with the docking lock shell 62, the retractable assembly 61, and the heading support rod 63 of the high strut landing gear 6, thereby completing the installation of the high strut landing gear 6 on the test fixture.

[0058] 3. Finally, the test fixture with the high strut landing gear 6 is connected with the test bench 7: the top support 5 of the test fixture is fixedly connected with the test bench 7, the side support plates 21 of the two side support assemblies 2 are fixedly connected with the test bench 7, and then the aircraft brake main wheel is installed on the main shaft of the high strut landing gear 6, thereby enabling the integrated testing of the aircraft landing gear system, the wheel brake, and the brake control subsystem in the laboratory. During the testing, the universal joint 31, the retractable support joint 32, the retractable support rod joint 33, the vertical support rod joint 34, the heading support rod joint 42, and the lower lock joint 35 play a role in positioning the landing gear 6, the top support 5 and the side support assembly 2 transmit the load of the test bench 7, and the bearing plate assembly 1 and the front support assembly 4 bear the brake torque and the heading torque.

[0059] Since the installation state of the high strut landing gear 6 on the test fixture truly simulates the installation state of the high strut landing gear 6 with the aircraft fuselage, the consistency of the installation state of the high strut landing gear 6 with the outside field is maximized, thereby enabling the integrated testing of the aircraft landing gear system, the wheel brake, and the brake control subsystem in the laboratory, ensuring the high consistency of the test results with the test results on the aircraft, and accelerating the testing progress.

[0060] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the spirit and scope of the present application.

Claims

1. A test fixture for securing a high strut landing gear to a test stand, characterized by: The bearing plate assembly, the side support assembly, the joint assembly, and the front support assembly are included. The bearing plate assembly is used as a clamp body, and a joint assembly is installed on one side of the bearing plate assembly. The joint assembly is used to connect the retractable assembly of the high strut landing gear and the docking lock shell. The top end of the bearing plate assembly is connected to the test bench through a top support. Two groups of side support assemblies are installed on the side walls of the bearing plate assembly and symmetrically located on both sides of the joint assembly. The top surface of the side support assembly is fixedly connected to the bottom surface of the test bench. The front support assembly is installed on one side of the upper end of the bearing plate assembly and used to connect the heading support rod of the high strut landing gear. The joint assembly and the front support assembly are used to vertically install the high strut landing gear on one side of the bearing plate assembly.

2. A test fixture for securing a high strut landing gear to a test stand as defined in claim 1, wherein: The top support and the side support assembly are used to transmit the load of the test bench.

3. A test fixture for securing a high strut landing gear to a test stand as defined in claim 2, wherein: The bearing plate assembly and the front support assembly respectively bear the brake torque and the heading torque during the test.

4. A test fixture for securing a high strut landing gear to a test stand as set forth in claim 2, characterized in that: The front support assembly includes a front support plate and a heading support rod joint. One end of the front support plate is horizontally fixed between the bearing front plate and the bearing rear plate, and the other end is fixed with the heading support rod joint. The heading support rod joint is located in the same plane as the joint assembly, and the heading support rod joint is used to connect the heading support rod of the high strut landing gear. The joint assembly includes a universal joint, a retractable support bracket joint, a retractable support rod joint, a vertical support rod joint, and a lower lock joint. Each joint is fixed to the outer side wall of the bearing front plate of the bearing plate assembly. The universal joint, the retractable support bracket joint, and the retractable support rod joint are used to connect the retractable assembly of the high strut landing gear. The vertical support rod joint and the two lower lock joints are used to connect the docking lock shell of the high strut landing gear. The mounting lugs are provided on the universal joint, the retractable support bracket joint, the retractable support rod joint, the vertical support rod joint, the lower lock joint, and the heading support rod joint. The structure and relative position of each joint are matched with the mounting interfaces of the retractable assembly, the docking lock shell, and the heading support rod of the high strut landing gear. The bearing plate assembly includes two structurally identical bearing plates and a plurality of bearing ribs. The two bearing plates are arranged in parallel and are denoted as a bearing front plate and a bearing rear plate. The plurality of bearing ribs are cross-intersected to form a frame-type reinforcing rib and are fixed between the two bearing plates by fasteners. The top of the frame-type reinforcing rib is horizontally fixed with a reinforcing block. The two ends of the top support are provided with mounting surfaces of different levels. One end of the mounting surface is fixedly connected to the reinforcing block, and the other end of the mounting surface is fixedly connected to the bottom surface of the test bench. The side support assembly includes a side support plate and a connecting plate. The side support plate has a right-angled triangular structure, and a connecting plate is fixed on one side of the right-angled edge. The connecting plate is used to fixedly connect the side support plate and the two bearing plates. The other side of the right-angled edge is fixedly connected to the bottom surface of the test bench by screws. A support rod through slot is provided on the side support plate close to the front support assembly for passing through the heading support rod of the high strut landing gear. The side support assembly is installed on the outer side of the bearing front plate.

5. A test fixture for securing a high strut landing gear to a test stand as defined in claim 4, wherein: The side support plate is provided with multiple triangular reinforcing ribs on both sides symmetrically and uniformly, which is used to improve the supporting strength of the side support assembly.

6. A test fixture for securing a high strut landing gear to a test stand as set forth in claim 4, wherein: Multiple lightening holes are uniformly distributed at the center of the bearing plate, and the side support plate is also provided with lightening holes, which is used to reduce the overall weight of the test fixture.

7. Use of the test fixture of claim 1, wherein: The installation sequence of the test fixture, the high strut landing gear and the test bench is: first, assemble the test fixture, then complete the assembly of the high strut landing gear on the test fixture, and finally install the test fixture with the high strut landing gear to the test bench.

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