A landing gear test strip for a vehicle

Abstract

The application provides a kind of frame landing gear taxiing stability test belt rotating device, including: main flywheel assembly, including main flywheel, special-shaped rotating shaft and two fixed supports fixed on test chamber track, main flywheel is installed on fixed support by special-shaped rotating shaft;Drive assembly, including drive motor and drive wheel installed on fixed support, drive wheel is in contact with main flywheel, drive motor connects drive wheel rotation to drive main flywheel rotation;Rolling flywheel assembly, including fixed rack, multiple rolling flywheels with different diameters and protection flywheel, fixed rack is installed on test chamber track, multiple rolling flywheels and protection flywheel are installed on fixed rack, multiple rolling flywheels are distributed above main flywheel and in contact with main flywheel, protection flywheel is located on both sides of multiple rolling flywheels, each rolling flywheel is driven to rotate by rotation of main flywheel to drive rotation of each landing gear wheel, so as to realize simulation of frame landing gear assembly taxiing speed.

Description

Technical Field

[0001] This application belongs to the field of landing gear testing, and specifically relates to a rotating device for testing the skid stability of a chassis-type landing gear. Background Technology

[0002] Run-on stability is a crucial issue that must be considered and addressed in the design of chassis-type landing gear. Current research on run-on stability of chassis-type landing gear is limited to theoretical and simulation analyses, lacking experimental studies. The main factor hindering the development of this experimental research is the absence of a testing device for conducting run-on stability tests on chassis-type landing gear. The core challenge lies in the lack of a device that can simultaneously provide vertical support for each wheel of the chassis-type landing gear and enable the rolling drive of each wheel.

[0003] Currently, domestic testing facilities can only support taxiing stability tests on single-wheel or coaxial dual-wheel landing gear. These facilities drive the wheels by placing a flywheel, wider and with a larger diameter than the wheel itself, underneath each wheel. During testing, the high-speed rotation of the flywheel supports and drives the landing gear wheels. This current testing equipment only meets the testing requirements for single-wheel or coaxial dual-wheel landing gear. For chassis-type landing gear with a large front-to-rear span, this drive system cannot meet the support and roll requirements of each wheel. Summary of the Invention

[0004] The purpose of this application is to provide a chassis-type landing gear skid stability test device to solve or mitigate at least one of the problems in the prior art.

[0005] The technical solution of this application is: a chassis-type landing gear skid stability test device with rotation, comprising: a main flywheel assembly, a drive assembly and a rolling flywheel assembly;

[0006] The main flywheel assembly includes a main flywheel, a shaped rotating shaft for supporting the main flywheel, and two fixed brackets fixed on the laboratory track. The main flywheel is mounted on the fixed brackets via the shaped rotating shaft.

[0007] The drive assembly includes a drive motor and a drive wheel mounted on a fixed bracket. The drive wheel is in contact with the main flywheel. The drive motor is connected to the drive wheel and is used to rotate the drive wheel, thereby driving the main flywheel to rotate.

[0008] The rolling flywheel assembly includes a fixed frame, multiple rolling flywheels of different diameters, and a protective flywheel. The fixed frame is installed on a test track, and the multiple rolling flywheels and protective flywheels are installed on the fixed frame. The multiple rolling flywheels are distributed above and in contact with the main flywheel, and the protective flywheels are located on both sides of the multiple rolling flywheels to prevent the landing gear wheels of the chassis-type landing gear assembly from slipping out of the boundary during the test. The rotation of the main flywheel drives the rotation of each rolling flywheel to drive the rotation of each landing gear wheel, thereby simulating the taxiing speed of the chassis-type landing gear assembly.

[0009] Preferably, the main flywheel has a shaped hole at its shaft center, and the cross-section of the part of the shaped rotating shaft that mates with the main flywheel is the same as the shaped hole.

[0010] Preferably, the irregular hole includes a cross shape.

[0011] Preferably, the main flywheel has multiple axially extending vibration damping holes around the irregular hole.

[0012] Preferably, the vibration damping hole is fan-shaped.

[0013] Preferably, the multiple rolling flywheels include small-diameter rolling flywheels, medium-diameter rolling flywheels, and large-diameter rolling flywheels of different diameters. The small-diameter rolling flywheels, medium-diameter rolling flywheels, and large-diameter rolling flywheels are arranged on the fixed frame in order of increasing diameter from the inside to the outside, thereby forming a flat rolling surface.

[0014] Preferably, there are two or more small-diameter rolling flywheels, medium-diameter rolling flywheels, and large-diameter rolling flywheels, which are distributed on both sides of the main flywheel as the center.

[0015] Preferably, the diameter of the protective flywheel is significantly larger than the diameter of any one of the small-diameter, medium-diameter, and large-diameter rolling flywheels.

[0016] Preferably, the fixed platform has a Z-shaped structure, with a doorway formed in the middle of the fixed platform, and the size of the doorway is adapted to the outer contour of the fixed bracket.

[0017] Preferably, the irregularly shaped rotating shaft is connected to a speed indicator for monitoring the speed of the main flywheel.

[0018] The device described in this application can provide rolling drive and vertical support for each landing gear wheel on the chassis during stability testing of chassis-type landing gear, thereby simulating the taxiing speed and ground support of chassis-type landing gear during ground taxiing, improving test accuracy, making test results more consistent with actual conditions, and providing more realistic, complete and reliable test results for the design and finalization of aircraft chassis-type landing gear systems and structures. Attached Figure Description

[0019] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0020] Figure 1 This is an exploded view of the main flywheel assembly of this application.

[0021] Figure 2 This is a schematic diagram of the main flywheel assembly of this application.

[0022] Figure 3 This is an exploded view of the driver components of this application.

[0023] Figure 4 This is a schematic diagram of the driver component assembly for this application.

[0024] Figure 5 This is an exploded view of the rolling flywheel assembly of this application.

[0025] Figure 6 This is a schematic diagram of the assembly of the rolling flywheel assembly of this application.

[0026] Figure 7 This is a schematic diagram of the assembly of the main flywheel assembly and the drive assembly of this application.

[0027] Figure 8 This is a schematic diagram of the assembly of the main flywheel assembly, drive assembly and rolling flywheel assembly of this application.

[0028] Figure 9 This is a schematic diagram of the chassis-type landing gear assembly of this application.

[0029] Figure 10 This is a schematic diagram of the testing process for the chassis-type landing gear assembly of this application.

[0030] Figure label:

[0031] 100-Main Flywheel Assembly

[0032] 101-Main Flywheel

[0033] 102-Irregular Shaped Spindle

[0034] 103-Fixed Bracket

[0035] 104-Rotating Bearing

[0036] 105-Irregular Hole

[0037] 106-Weight Reduction Hole

[0038] 107-Drive wheel mounting hole

[0039] 200-Driver Components

[0040] 201-Drive Motor

[0041] 202-Drive Wheel

[0042] 300-Rolling Flywheel Assembly

[0043] 301-Fixed Stand

[0044] 302 - Small Diameter Rolling Flywheel

[0045] 303-Medium Diameter Rolling Flywheel

[0046] 304 Large Diameter Rolling Flywheel

[0047] 305 - Protects the flywheel

[0048] 306 - Entrance

[0049] 400-Laboratory Ground Rail

[0050] 401-Track

[0051] 500-speed indicator

[0052] 600-Frame-type Landing Gear Assembly

[0053] 601-Landing Gear Wheels Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0055] This application addresses the structural characteristics of chassis-type landing gear by providing a wheel drive mechanism that simultaneously provides vertical support and roll rotation for each wheel of the chassis-type landing gear. This mechanism can simulate the aircraft's taxiing speed and maintain a certain rotational speed for each wheel of the chassis-type landing gear, while also providing support for the vertical load on the wheels, thereby solving the problem of testing the taxiing stability of chassis-type landing gear in the laboratory.

[0056] This application provides a rotating device suitable for testing the skid stability of a chassis-type landing gear. A main flywheel driven by a motor drives a set of auxiliary flywheels, thereby achieving support and rolling drive for each wheel of the chassis-type landing gear.

[0057] The chassis-type landing gear skid stability test device provided in this application mainly includes: main flywheel assembly 100, drive assembly 200 and rolling flywheel assembly 300.

[0058] As attached Figure 1 and Figure 2As shown, the main flywheel assembly 100 includes: a main flywheel 101, a shaped rotating shaft 102, a fixed bracket 103, and a rotating bearing 104.

[0059] The drive wheel 101 is a cylindrical structure with a relatively large diameter, and it has irregularly shaped holes 105 along its axis. In some embodiments of this application, the irregularly shaped holes 105 can be rectangular, cross-shaped, or other shapes. In the illustrated embodiment, the irregularly shaped holes 105 are cross-shaped. Preferably, the drive wheel 101 has a plurality of axially extending damping holes 106 around the irregularly shaped holes 105. The damping holes 106 can be configured as fan-shaped holes.

[0060] The central portion of the irregularly shaped rotating shaft 102 is designed to fit the cross-sectional shape of the irregularly shaped hole 105. For example, in this embodiment of the application, the central portion of the irregularly shaped rotating shaft 102 is cross-shaped. By providing the irregularly shaped hole 105 on the drive wheel 101 and setting the cross-section of the irregularly shaped rotating shaft 102 to match the irregularly shaped hole, the support capacity of the irregularly shaped rotating shaft 102 for the main flywheel 101 can be improved, while the transmission capacity between the irregularly shaped rotating shaft 102 and the main flywheel 101 can also be improved. Both ends of the irregularly shaped rotating shaft 102 are configured as cylindrical structures.

[0061] Two fixed brackets 103 are frame structures, installed on the tracks 401 on both sides of the laboratory floor rail 400. The laboratory floor rail 400 has multiple parallel tracks 401, and the two fixed brackets 103 are fixed within suitable tracks 401 according to the testing requirements of the chassis-type landing gear assembly 600. The center of each fixed bracket 103 has a mounting hole for a shaped rotating shaft 102. The cylindrical structures at both ends of the shaped rotating shaft 102 are installed within rotating shaft bearings 104 and within the shaped rotating shaft mounting holes. At least one drive wheel mounting hole 107 is provided on the lower side of each fixed bracket 103 for mounting a drive wheel 202. In a preferred embodiment of this application, to enable the main flywheel 101 to be more powerfully driven by the drive wheel 202, two drive wheel mounting holes 107 are provided to mount two drive wheels 202 to drive the main flywheel 101.

[0062] The process of installing the main flywheel assembly 100 is as follows: First, insert the irregularly shaped shaft 102 into the cross-shaped irregular hole 105 in the center of the main flywheel 101. Then, install the rotating bearing 104 on both ends of the irregularly shaped shaft 102. Next, install the assembled rotating bearing 104, irregularly shaped shaft 102 and main flywheel 101 onto the fixed bracket 103. Then, fix the installed main flywheel assembly 100 onto the laboratory floor rail 400. At the same time, one end of the irregularly shaped shaft 102 is connected to the speed indicator 500 to monitor the speed of the main flywheel 101.

[0063] like Figure 3 and Figure 4As shown, the drive assembly 200 includes a drive motor 201 and a drive wheel 202 for driving the main flywheel 101 to rotate.

[0064] The drive motor 201 is used to provide power for the rotation of the main flywheel 101. The drive motor 201 can be a stepper motor, servo motor or torque motor, etc.

[0065] The drive wheel 202 has a stepped cylindrical structure, with a larger diameter cylinder in the middle and smaller diameter cylinders at both ends (fitting the diameter of the drive wheel mounting holes 107 in the fixed bracket 103). The cylindrical structure in the middle of the drive wheel 202 can contact or press against the outer surface of the main flywheel 101, thus driving the main flywheel 101 to rotate when the drive wheel 202 rotates. The two ends of the drive wheel 202 are installed in the drive wheel mounting holes 107 of the fixed bracket 103. The drive connection 201 connects to the ends of the drive wheel 202, and the drive wheel 202 is driven to rotate by the drive motor 201.

[0066] like Figure 5 and Figure 6 As shown, the rolling flywheel assembly 300 includes: a fixed frame 301, a small-diameter rolling flywheel 302, a medium-diameter rolling flywheel 303, a large-diameter rolling flywheel 304, and a protective flywheel 305 for preventing the landing gear wheels 601 from slipping off the boundary during the test.

[0067] The mounting frame 301 has a Z-shaped structure, with a doorway 306 formed in the middle. The size of the doorway 306 is adapted to the outer contour of the mounting bracket 103. The mounting frame 301 is installed on the outside of the mounting bracket 103, and the mounting bracket 103 is placed inside the doorway 306.

[0068] The small-diameter rolling flywheel 302, the medium-diameter rolling flywheel 303, the large-diameter rolling flywheel 304, and the protective flywheel 305 are all stepped cylindrical structures. The middle part of the above flywheels is a cylindrical structure with a larger diameter, which is used to form the rolling surface of the landing gear wheels. The two ends are cylindrical structures with a smaller diameter, which are used to be installed on the fixed frame 301.

[0069] In a preferred embodiment of this application, the small-diameter rolling flywheel 302, the medium-diameter rolling flywheel 303, and the large-diameter rolling flywheel 304 are arranged on the fixed frame 301 in order of increasing diameter at the center position, thereby forming a flat rolling surface, and the protective flywheel 305 is located on the outermost side.

[0070] Furthermore, the small-diameter rolling flywheel 302, the medium-diameter rolling flywheel 303, and the large-diameter rolling flywheel 304 can be set to two or more, usually an even number, and distributed on both sides of the main flywheel 101 as the center.

[0071] In a preferred embodiment of this application, the cylindrical structure dimension of the central portion of the protective flywheel 305 is significantly larger than the central cylindrical structure dimension of any one of the small-diameter rolling flywheel 302, the medium-diameter rolling flywheel 303, or the large-diameter rolling flywheel 304. For example, the cylindrical structure dimension of the central portion of the protective flywheel 305 can be set to be twice or more than the central cylindrical structure dimension of the large-diameter rolling flywheel 304.

[0072] like Figure 7 As shown, in use, first assemble the main flywheel assembly 100 and the drive assembly 200. With the fixed position of the main flywheel assembly 100 as the center, arrange the drive wheels 202 on both sides of the main flywheel 101 so that the drive wheels 202 are in contact with the main flywheel 101. Then, fix the fixed bracket 103 on the laboratory floor rail 400 and connect the drive wheels 202 to the drive motor 201.

[0073] like Figure 8 As shown, the rolling flywheel assembly 300 is then assembled. Based on the installation position of the main flywheel 101, the fixed frame 301 is symmetrically arranged at both ends of the main flywheel 101, while the small-diameter rolling flywheel 302, medium-diameter rolling flywheel 303, and large-diameter rolling flywheel 304 are positioned at the top of the main flywheel 101. The height and front-back position of the fixed frame 301 are adjusted so that the top of the main flywheel 101 is in full contact with the small-diameter rolling flywheel 302, medium-diameter rolling flywheel 303, and large-diameter rolling flywheel 304. After adjusting the position, the fixed frame 301 is fixed on the laboratory floor rail 400. Finally, protective flywheels 304 are installed on both sides of the fixed frame 301.

[0074] like Figure 9 and Figure 10 As shown, during the experiment, the drive motor 201 is turned on, and the drive motor 201 drives the drive wheel 202 to rotate. Then, the main flywheel 101 is driven to rotate through the contact friction between the drive wheel 202 and the main flywheel 101. The rotation of the main flywheel 101 drives the small-diameter rolling flywheel 302, the medium-diameter rolling flywheel 303, and the large-diameter rolling flywheel 304 on the rolling flywheel assembly 300 to rotate. When the speed indicator 500 shows that the speed has reached the given speed, the frame-type landing gear assembly 600 is slowly lowered, so that each landing gear wheel 601 of the frame-type landing gear assembly 600 contacts each rolling flywheel in the rolling flywheel assembly 300. The rotation of the small-diameter rolling flywheel 302, the medium-diameter rolling flywheel 303, and the large-diameter rolling flywheel 304 drives the rotation of each landing gear wheel 601, thereby simulating the taxiing speed of the frame-type landing gear assembly 600.

[0075] The device described in this application can provide rolling drive and vertical support for each landing gear wheel on the chassis during stability testing of chassis-type landing gear, thereby simulating the taxiing speed and ground support of chassis-type landing gear during ground taxiing, improving test accuracy, making test results more consistent with actual conditions, and providing more realistic, complete and reliable test results for the design and finalization of aircraft chassis-type landing gear systems and structures.

[0076] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for testing the skid stability of a chassis-type landing gear, characterized in that, include: Main flywheel assembly (100), drive assembly (200) and rolling flywheel assembly (300); The main flywheel assembly (100) includes a main flywheel (101), a shaped rotating shaft (102) for supporting the main flywheel (101), and two fixed brackets (103) fixed on the laboratory track (400). The main flywheel (101) is mounted on the fixed brackets (103) via the shaped rotating shaft (102). The drive assembly (200) includes a drive motor (201) and a drive wheel (202) mounted on a fixed bracket (103). The drive wheel (202) is in contact with the main flywheel (101). The drive motor (201) is connected to the drive wheel (202) and is used to make the drive wheel (202) rotate, thereby driving the main flywheel (101) to rotate. The rolling flywheel assembly (300) includes a fixed frame (301), multiple rolling flywheels of different diameters, and a protective flywheel (305). The fixed frame (301) is installed on the test track (400). The multiple rolling flywheels and the protective flywheel (305) are installed on the fixed frame (301). The multiple rolling flywheels are distributed above the main flywheel (101) and in contact with the main flywheel (101). The protective flywheel (305) is located on both sides of the multiple rolling flywheels and is used to prevent the landing gear wheels (601) of the frame-type landing gear assembly (600) from slipping out of the boundary during the test. The rotation of the main flywheel (101) drives the rotation of each rolling flywheel to drive the rotation of each landing gear wheel (601), thereby simulating the running speed of the frame-type landing gear assembly (600).

2. The chassis-type landing gear skid stability testing device as described in claim 1, characterized in that, The main flywheel (101) has a shaped hole (105) at its shaft center, and the cross section of the part where the shaped rotating shaft (102) mates with the main flywheel (101) is the same as that of the shaped hole (105).

3. The chassis-type landing gear skid stability testing device as described in claim 2, characterized in that, The irregular hole (105) includes a cross shape.

4. The chassis-type landing gear skid stability testing device according to any one of claims 1 to 3, characterized in that, The main flywheel (101) has multiple axially extending damping holes (106) around the irregular hole (105).

5. The chassis-type landing gear skid stability testing device as described in claim 4, characterized in that, The vibration damping hole (106) is fan-shaped.

6. The chassis-type landing gear skid stability testing device as described in claim 1, characterized in that, The various rolling flywheels include small-diameter rolling flywheels (302), medium-diameter rolling flywheels (303), and large-diameter rolling flywheels (304) with different diameters. The small-diameter rolling flywheels (302), medium-diameter rolling flywheels (303), and large-diameter rolling flywheels (304) are arranged on the fixed frame (301) in order of increasing diameter from the inside to the outside, thereby forming a flat rolling surface.

7. The chassis-type landing gear skid stability testing device as described in claim 6, characterized in that, The small-diameter rolling flywheel (302), medium-diameter rolling flywheel (303) and large-diameter rolling flywheel (304) are two or more, and are distributed on both sides of the main flywheel (101) as the center.

8. The chassis-type landing gear skid stability testing device as described in claim 7, characterized in that, The diameter of the protective flywheel (305) is significantly larger than the diameter of any of the small-diameter rolling flywheels (302), medium-diameter rolling flywheels (303), and large-diameter rolling flywheels (304).

9. The chassis-type landing gear skid stability testing device as described in claim 1, characterized in that, The fixed frame (301) has a U-shaped structure, and a doorway (306) is formed in the middle of the fixed frame (301). The size of the doorway (306) is adapted to the outer contour of the fixed bracket (103).

10. The chassis-type landing gear skid stability testing device as described in claim 1, characterized in that, The irregularly shaped rotating shaft (102) is connected to a speed indicator (500) for monitoring the speed of the main flywheel (101).

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