Tire pressure on-line adjusting assembly for airplane wheel test

Abstract

The utility model relates to an airplane wheel test tire pressure on-line adjusting assembly, which belongs to the technical field of aviation airplane wheels and comprises an airplane wheel mounting shaft, a gas pipeline, a rotary sealing joint, a connecting hose, a valve pipe nozzle, a stop valve and a pressure gauge. The airplane wheel mounting shaft cantilever is fixed on the mounting platform, and the outer diameter of the airplane wheel mounting shaft cantilever is sleeved with an aviation airplane wheel for testing. The wheel mounting shaft is provided with a through hole along the central axis, one end of the through hole is communicated with an external gas source through a gas pipeline, and the other end is provided with the fixed end of the rotary sealing joint. The stop valve and the pressure gauge are both installed in the gas pipeline. One end of the valve nozzle is communicated with the inner cavity of the tire, and the other end of the valve nozzle is communicated with the air outlet joint at the rotating end of the rotary sealing joint through a connecting hose. The device is used for online tire inflation and deflation in the fatigue rolling test process of the aviation aircraft wheel, the purpose of adjusting the tire pressure is achieved, the test service life of the tire is prolonged, and the probability of tire burst is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft wheels, and in particular relates to an online tire pressure regulating component for a wheel test. Background Art

[0002] When aircraft wheels are undergoing fatigue roll tests, the tires will generate a large amount of heat under the action of external loads, causing the tire temperature to rise and the inflation pressure to increase, which will produce additional stress on the wheels and tires. Inflation pressure is a load that aircraft wheels bear for a long time during use, and it has a great impact on the life of the wheels. Excessive tire pressure will increase the tire load and shorten the tire life, increase the probability of tire blowout accidents, and pose a safety hazard to personnel, test pieces and equipment. In existing test devices, the tire pressure is not adjustable. As the wheel undergoes a fatigue roll test, this increase in air pressure is harmful to the life assessment of the wheel, and will also increase the test cost.

[0003] If the tire internal pressure can be adjusted in time during the wheel roll test, the test service life of the tire can be effectively extended and the probability of tire blowout can be reduced, thereby achieving the purpose of reducing the test cost and protecting the test piece and test equipment. To achieve this goal, the traditional method is to use a cooling fan or water spray to cool the tire and then reduce the tire pressure. The disadvantage is that it is easy to cause uneven heating of the tire, and water spraying will cause hidden dangers such as rust on the equipment.

[0004] Therefore, it is necessary to design a device for online tire pressure adjustment during aircraft wheel fatigue rolling test. Summary of the invention

[0005] Technical problem to be solved: In order to avoid the deficiencies of the prior art, the present invention provides an online tire pressure adjustment component for a wheel test. During a rolling test of an aircraft wheel, the tire pressure is inflated or deflated by the online adjustment component of the present invention, thereby achieving online dynamic adjustment of the tire pressure.

[0006] The technical solution of the present invention is: an online tire pressure adjustment component for wheel testing, comprising a wheel mounting shaft, a gas pipeline, a rotary sealing joint, a connecting hose, a valve nozzle, a stop valve, and a pressure gauge; one end of the wheel mounting shaft is fixedly connected to the horizontal cantilever of the mounting platform of the test bench, and an aviation wheel for testing is mounted on the outer diameter of the wheel mounting shaft; a through hole is provided along the central axis of the wheel mounting shaft, and one end of the through hole close to the mounting platform is an air inlet, and the other end is an air outlet; one end of the gas pipeline is connected to an external gas source, and the other end is connected to the air inlet of the wheel mounting shaft; the stop valve , and a pressure gauge are installed in the gas pipeline; the pressure gauge is close to the wheel mounting shaft and is used to detect the pressure in the gas pipeline; the stop valve is located between the external gas source and the pressure gauge and is used to open or close the gas pipeline; the fixed end of the rotary sealing joint is installed at the air outlet of the wheel mounting shaft, and the rotating end thereof is provided with an air outlet joint, and the air outlet joint is sealed and connected to one end of the connecting hose; a through hole is provided in the valve nozzle, and the valve nozzle is installed on the wheel hub of the aircraft wheel, one end of which is connected to the tire inner cavity of the aircraft wheel, and the other end of which is sealed and connected to the other end of the connecting hose;

[0007] The gas from the external gas source flows sequentially through the gas pipeline, the through hole of the wheel mounting shaft, the rotary sealing joint, the connecting hose, and the valve nozzle into the inner cavity of the tire.

[0008] A further technical solution of the present invention is: when the stop valve is in a closed state, the pressure detected by the pressure gauge is the pressure inside the tire; when the stop valve is in an open state, it is used to inflate or deflate the tire.

[0009] A further technical solution of the present invention is: an air inlet of the wheel mounting shaft through hole is provided with an internal thread for sealing connection with the gas pipeline thread; an air outlet of the wheel mounting shaft through hole is provided with an internal thread for sealing connection with the fixed end thread of the rotary sealing joint.

[0010] A further technical solution of the present invention is: a mounting flange is provided at the fixed end of the wheel mounting shaft, a mounting shaft portion with the same diameter as the inner hole of the mounting platform is coaxially provided on the outer side of the mounting flange, the mounting shaft portion is embedded in the inner hole of the mounting platform, the outer end surface of the mounting flange is in contact with the mounting platform surface, bolt holes are provided around the flange, and bolts are passed through the flange to fix it to the mounting platform of the test bench.

[0011] A further technical solution of the present invention is that an outer diameter wall of the air outlet end of the wheel mounting shaft is provided with an external thread for mounting a locking nut to limit the axial position of the aircraft wheel.

[0012] A further technical solution of the present invention is that the structural dimensions of the location where the wheel mounting shaft and the aircraft wheel are matched and installed are consistent with the wheel shaft of the aircraft wheel to be tested.

[0013] A further technical solution of the present invention is: both ends of the valve nozzle are external thread structures, one end is provided with a sealing cone section, and an external thread is provided close to the cone section. This end cooperates with and is threadedly connected to the corresponding valve nozzle mounting hole on the wheel hub; the external thread at the other end is sealed and connected to the connecting hose.

[0014] A further technical solution of the present invention is that: the valve nozzle is provided with an external hexagonal structure for screwing and assembling with a wrench.

[0015] Beneficial Effects

[0016] The beneficial effects of the present invention are as follows: the online tire pressure adjustment component for a wheel test of the present invention can realize tire inflation and deflation during a fatigue rolling test of an aircraft wheel, that is, when the wheel is rotating, so as to achieve the purpose of adjusting the online tire pressure, thereby increasing the test service life of the tire, reducing the probability of tire blowout, and avoiding the problem of uneven tire heating or rusting of the test equipment caused by using a cooling fan or water spraying to cool the tire.

[0017] Based on the existing rolling test equipment for aircraft wheels, the present invention designs an air circuit for inflation and deflation and real-time monitoring of tire pressure: the gas pipeline, the through hole of the wheel mounting shaft, the rotary sealing joint, the connecting hose, and the valve nozzle form the air circuit for tire intake and exhaust. By designing a stop valve and a pressure gauge in the gas pipeline, when the stop valve is closed, no gas passes through the valve nozzle, and the gas is sealed in the air circuit from the stop valve to the tire. At this time, the pressure gauge can monitor the tire pressure in real time during the test. By opening the stop valve, the gas pipeline is connected to an external gas source, and the inflation and deflation functions can be realized.

[0018] The present invention designs a two-way inflation and deflation valve nozzle in coordination with the overall gas circuit, replacing the existing one-way inlet-only but not outlet valve nozzle, so that the gas pipeline, the through hole of the wheel mounting shaft, the rotary sealing joint, the connecting hose, the valve nozzle, and the tire form a two-way passage for easy inflation and deflation.

[0019] The present invention adopts a rotary sealing joint, and the rotating end of the rotary sealing joint rotates with the wheel hub, thereby ensuring that the inner cavity of the tire is always connected to the air path of the present invention during the rolling test of the wheel. At the same time, the connecting hose between the valve nozzle and the rotary sealing joint adopts a pressure-resistant flexible connecting hose to ensure the service life requirements.

[0020] In the present invention, the wheel mounting shaft cantilever is fixedly mounted on the mounting platform, and a through hole is designed on the central axis of the wheel mounting shaft, and the through hole is directly used as a part of the air path, thereby avoiding the increase of the number of parts and improving the reliability of the entire adjustment assembly. In addition, since the diameter of the air hole of the wheel mounting shaft is small, the adverse effect of the through hole on the rigidity and strength of the wheel mounting shaft is minimized.

[0021] The invention is convenient for long-distance pressure regulation control, and the tire pressure is regulated by controlling the stop valve to inflate and deflate the tire of the machine wheel. The entire working process can be manually remotely operated, thereby improving the safety of the test operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an online tire pressure adjustment assembly for a wheel test of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the wheel mounting shaft in the present invention;

[0024] Figure 3 for Figure 2 C-direction view in;

[0025] Figure 4 for Figure 2 A partial enlarged view of the air inlet at point A in the middle;

[0026] Figure 5 for Figure 2 A partial enlarged view of the air outlet at B in the middle;

[0027] Figure 6 It is a structural diagram of the valve nozzle in the present invention.

[0028] Explanation of the reference numerals: 1. wheel mounting shaft, 11. through hole, 12. mounting flange, 13. mounting shaft, 14. air inlet, 15. air outlet, 2. gas pipeline, 3. rotary sealing joint, 31. air outlet joint, 4. connecting hose, 5. valve nozzle, 6. stop valve, 7. pressure gauge, 8. mounting platform, 9. wheel hub. DETAILED DESCRIPTION

[0029] The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] The present invention discloses an online tire pressure regulating component for a wheel test, which is suitable for use in an aircraft wheel fatigue rolling test. By installing the tire pressure regulating component on an aircraft wheel fatigue rolling test bench, the aircraft wheel tire pressure during the test can be monitored in real time, and the tire can be inflated and deflated online without stopping the test, thereby avoiding the impact of excessive tire pressure during the test on the tire life, avoiding the risk of tire blowout, and also ensuring the safety of the test.

[0032] See also Figure 1 The wheel test tire pressure online adjustment component of the present invention includes a wheel mounting shaft 1, a gas pipeline 2, a rotary sealing joint 3, a connecting hose 4, a valve nozzle 5, a stop valve 6, and a pressure gauge 7.

[0033] The wheel mounting shaft 1 is manufactured according to the specifications of the wheel axle matched with the aircraft wheel to be tested. During the test installation process, the wheel mounting shaft 1 is used to replace the wheel axle, which is convenient for installation with the test bench. One end of the wheel mounting shaft 1 is horizontally fixedly connected to the mounting platform 8 of the test bench, and the test aircraft wheel is mounted on the outer diameter of the wheel mounting shaft 1. The wheel mounting shaft 1 is in a cantilever state. In order to ensure the connection stability of the cantilever structure and ensure the normal test of the aircraft wheel, the present invention provides a mounting flange 12 at the fixed end of the wheel mounting shaft 1. A plurality of bolt holes are evenly distributed around the flange 12 for fixed connection with the mounting platform 8. The outer side of the mounting flange 12 is coaxially provided with a mounting shaft portion 13 of the same diameter as the inner hole of the mounting platform 8. By embedding the mounting shaft portion 13 into the inner hole of the mounting platform 8, the outer end face of the mounting flange 12 is in contact with the mounting platform 8, and the bolts are passed through the flange 12 to be fixedly connected with the mounting platform 8 of the test bench to ensure the reliability of the cantilever connection of the wheel mounting shaft 1. An external thread is provided on the outer diameter of the cantilever end of the wheel mounting shaft 1, and two locking nuts are installed on the external thread of the cantilever end to tighten the aircraft wheel and limit the axial position of the aircraft wheel.

[0034] See also Figure 2-5The wheel mounting shaft 1 of the present invention is provided with a through hole 11 along the central axis, and the diameter of the through hole 11 is 13 mm. The end of the through hole 11 close to the mounting platform 8 is an air inlet 14, and the other end is an air outlet 15. One end of the gas pipeline 2 is connected to the external gas source, and the other end is connected to the air inlet 14 of the wheel mounting shaft 1. The gas pipeline 2 can select a pipe with a diameter of 10 mm to 12 mm. The stop valve 6 and the pressure gauge 7 are both installed in the gas pipeline 2, wherein the pressure gauge 7 is close to one side of the wheel mounting shaft 1, and is used to detect the pressure in the gas pipeline 2; the stop valve 6 is located between the external gas source and the pressure gauge 7, and is used to open or close the gas pipeline 2. The rotary sealing joint 3 is a vent pipe joint with one end fixed and the other end rotating in the prior art, and its fixed end is installed at the air outlet 15 of the wheel mounting shaft 1, and its rotating end can rotate with the wheel hub 9. The rotating end of the rotary sealing joint 3 is provided with an air outlet joint 31, and the air outlet joint 31 is sealed and connected to one end of the connecting hose 4. In this embodiment, the maximum pressure resistance of the rotary sealing joint 3 is 10MPa, and the maximum rotation speed is 150rpm. A through hole is provided inside the valve nozzle 5 along the central axis, and the valve nozzle 5 is installed on the hub 9 of the aircraft wheel, one end of which is connected to the inner cavity of the tire of the aircraft wheel, and the other end of which is sealed and connected to the other end of the connecting hose 4. The connecting hose 4 is a pressure-resistant flexible connecting hose, which is used to seal and connect the valve nozzle 5 and the outlet joint 31 of the rotary sealing joint 3. In the above structure, the gas pipeline 2, the through hole 11 of the wheel mounting shaft 1, the rotary sealing joint 3, the connecting hose 4, and the valve nozzle 5 form an air path connecting the external air source and the inner cavity of the tire.

[0035] When it is necessary to inflate the tire, the gas pipeline 2 is connected to an external gas source, the gas source pressure is adjusted to a specified value, the stop valve 6 in the gas pipeline 2 is opened, and the pressurized gas sequentially passes through the through hole 11 of the wheel mounting shaft 1, the rotary sealing joint 3, the connecting hose 4 and the valve nozzle 5 into the tire. When the pressure gauge 7 shows that the internal pressure of the tire reaches the set value, the external gas source is turned off, and the stop valve 6 is closed at the same time. At this time, no gas passes through the valve nozzle 5, the tire pressure remains unchanged, and the tire pressure is detected by the pressure gauge 7 on the gas pipeline 2.

[0036] As the aircraft wheel fatigue rolling test proceeds, the internal pressure of the tire increases under the action of external loads. When the pressure gauge 7 detects that the tire pressure is higher than the set value, the stop valve 6 is manually opened, and the pressure gas inside the tire passes through the valve nozzle 5, the connecting hose 4, the rotary sealing joint 3, the through hole 11 of the wheel mounting shaft 1 in sequence, and is finally discharged from the gas pipeline 2. When the tire pressure is deflated to a suitable range, the stop valve 6 can be closed.

[0037] Furthermore, the present invention provides an internal thread at the air inlet 14 of the wheel mounting shaft 1 for threaded sealing connection with the gas pipeline 2, and provides an internal thread at the air outlet 15 of the wheel mounting shaft 1 for threaded sealing connection with the fixed end of the rotary sealing joint 3. The threaded connection sealing structure is convenient for assembly and disassembly.

[0038] The valve nozzle 5 in the present invention is a two-way valve nozzle with a through-hole structure inside, which is different from the traditional one-way valve nozzle that can only take in air. Both ends of the valve nozzle 5 of the present invention are external thread structures. One end of the valve nozzle 5 is provided with a sealing cone section, and an external thread is provided close to the cone section. This end is matched with the valve nozzle mounting hole correspondingly arranged on the wheel hub 9 and threadedly connected. The taper of the cone section is a 74° sealing angle to match the valve nozzle mounting hole of the wheel hub 9. The external thread at the other end of the valve nozzle 5 is sealed and connected to the connecting hose 4. In order to facilitate the loading and unloading of the valve nozzle 5, the present invention is provided with an external hexagonal structure on the valve nozzle 5, which is convenient for the wrench to screw and load and unload.

[0039] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. An online tire pressure adjustment assembly for wheel testing, characterized in that: The invention comprises a wheel mounting shaft (1), a gas pipeline (2), a rotary sealing joint (3), a connecting hose (4), a valve nozzle (5), a stop valve (6), and a pressure gauge (7); one end of the wheel mounting shaft (1) is fixedly connected to a horizontal cantilever of a mounting platform (8) of a test bench, and an aircraft wheel for testing is mounted on the outer diameter of the wheel mounting shaft (1); a through hole (11) is provided along the central axis of the wheel mounting shaft (1), one end of the through hole (11) close to the mounting platform (8) is an air inlet (14), and the other end is an air outlet (15); one end of the gas pipeline (2) is connected to an external gas source, and the other end is connected to the air inlet (14) of the wheel mounting shaft (1); the stop valve (6) and the pressure gauge (7) are both installed Installed in the gas pipeline (2); the pressure gauge (7) is close to the wheel mounting shaft (1) and is used to detect the pressure in the gas pipeline (2); the stop valve (6) is located between the external gas source and the pressure gauge (7) and is used to open or close the gas pipeline (2); the fixed end of the rotary sealing joint (3) is installed on the gas outlet (15) of the wheel mounting shaft (1), and the rotary end is provided with a gas outlet joint (31), and the gas outlet joint (31) is sealed and connected to one end of the connecting hose (4); the valve nozzle (5) is provided with a through hole, and the valve nozzle (5) is installed on the wheel hub (9) of the aircraft wheel, one end of which is connected to the tire inner cavity of the aircraft wheel, and the other end of which is sealed and connected to the other end of the connecting hose (4); The gas from the external gas source flows sequentially through the gas pipeline (2), the through hole (11) of the wheel mounting shaft, the rotary sealing joint (3), the connecting hose (4), and the valve nozzle (5) to enter the inner cavity of the tire.

2. The online tire pressure adjustment assembly for wheel testing according to claim 1, characterized in that: When the stop valve (6) is in a closed state, the pressure detected by the pressure gauge (7) is the pressure inside the tire; when the stop valve (6) is in an open state, it is used for tire inflation or deflation operations.

3. The online tire pressure adjustment assembly for wheel testing according to claim 1, characterized in that: The air inlet (14) of the wheel mounting shaft (1) is provided with an internal thread for threaded sealing connection with the gas pipeline (2); the air outlet (15) of the wheel mounting shaft (1) is provided with an internal thread for threaded sealing connection with the fixed end of the rotary sealing joint (3).

4. The online tire pressure adjustment assembly for wheel testing according to claim 1, characterized in that: The fixed end of the wheel mounting shaft (1) is provided with a mounting flange (12), and a mounting shaft portion (13) having the same diameter as the inner hole of the mounting platform (8) is coaxially provided on the outer side of the mounting flange (12), and the mounting shaft portion (13) is embedded in the inner hole of the mounting platform (8), and the outer end surface of the mounting flange (12) is in surface contact with the mounting platform (8), and a plurality of bolt holes are evenly distributed around the flange (12), and bolts are passed through the flange (12) to be fixedly connected to the mounting platform (8) of the test bench.

5. The online tire pressure adjustment assembly for wheel testing according to claim 1, characterized in that: An outer diameter wall of the air outlet (15) end of the wheel mounting shaft (1) is provided with an external thread for mounting a locking nut to limit the axial position of the aircraft wheel.

6. The online tire pressure adjustment assembly for wheel testing according to claim 1, characterized in that: The structural dimensions of the location where the wheel mounting shaft (1) cooperates with the aircraft wheel for mounting are consistent with the wheel shaft of the aircraft wheel to be tested.

7. The online tire pressure adjustment assembly for wheel testing according to claim 1, characterized in that: Both ends of the valve nozzle (5) are external thread structures, one end of which is provided with a sealing cone section, and an external thread is provided close to the cone section. This end cooperates with and is threadedly connected to a corresponding valve nozzle (5) mounting hole provided on the wheel hub (9); the external thread at the other end is sealedly connected to the connecting hose (4).

8. The online tire pressure adjustment assembly for wheel testing according to claim 7, characterized in that: The valve nozzle (5) is provided with an external hexagonal structure for screwing and assembling with a wrench.

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