Undercarriage buffer device

Abstract

The invention discloses an undercarriage buffer device, and relates to the technical field of undercarriage buffers. Comprising a cylinder body, a piston rod is in sliding fit with the cylinder body, and a piston is arranged on the end face, inside the cylinder body, of the piston rod; an adjusting seat is arranged in the cylinder body, a floating piston is arranged below the adjusting seat, a supporting and buffering mechanism is arranged at the bottom end of the cylinder body and comprises a buffering plate, a fixing mechanism is arranged at the bottom end of the buffering plate, oil holes are formed in the adjusting seat in an array mode, and an adjusting component is arranged in the adjusting seat and used for adjusting the flowing hole diameter of oil. The adjusting component comprises an adjusting valve body located on the inner side of the oil hole, an auxiliary heat dissipation mechanism is arranged on the piston rod, the auxiliary heat dissipation mechanism comprises a spraying sleeve arranged on the outer side of the cylinder body in a sleeving mode, and auxiliary heat dissipation is conducted by spraying cooling water; auxiliary heat dissipation of the buffer can be achieved, and when the air pressure in the buffer is unstable, emergency auxiliary supporting and buffering are conducted.

Description

Technical Field

[0001] The present invention relates to the technical field of landing gear buffers, and in particular to a landing gear buffer device. Background Art

[0002] Landing gear dampers, also known as landing gear shock absorbers or landing gear hydraulic dampers, are a crucial component of aircraft landing gear systems. They mitigate impact loads during landing and takeoff, protecting the aircraft structure and improving passenger comfort. Their primary function is to absorb and mitigate the significant impact forces generated by the landing gear during landing. Landing gear dampers typically utilize a hydraulic system to provide damping, combined with springs or gas pressure to absorb shock. Current landing gear dampers typically utilize a synergistic combination of hydraulics and gas to absorb vertical impact forces during landing. The repetitive motion of the piston within the damper and the continuous compression of the oil and gas generate significant heat. Despite high external air velocity, impurities adhering to the damper can affect heat dissipation. Furthermore, if leaks occur within the damper's air chamber, the air pressure can become unstable, preventing the gas from synergizing with the oil, significantly impacting the damping operation. Therefore, the present invention proposes a damper that can provide auxiliary heat dissipation and provide emergency auxiliary support and cushioning when the internal air pressure is unstable. Summary of the Invention

[0003] In response to the above technical problems, the present invention can achieve auxiliary heat dissipation of the buffer and perform emergency auxiliary support buffering when the air pressure inside the buffer is unstable.

[0004] The usage scheme of the present invention is: a landing gear buffer device, including a cylinder body, a piston rod is slidably fitted on the cylinder body, and a piston is provided on the piston rod on the inner end surface of the cylinder body; an adjusting seat is provided inside the cylinder body, and a floating piston is provided below the adjusting seat, and the upper and lower sides of the piston are respectively oil chambers, and the two oil chambers are connected by an oil pipe, and a regulating valve is provided between the oil pipe and the oil chamber; the upper and lower sides of the floating piston are respectively oil chambers and air chambers; a supporting buffer mechanism is provided at the bottom end of the air chamber, and the supporting buffer mechanism includes a buffer plate, and a fixing mechanism is provided at the bottom end of the buffer plate for fixing the buffer plate to the bottom end of the air chamber; oil holes are arranged in an array on the adjusting seat, and an adjusting component is provided inside the adjusting seat for adjusting the flow aperture of the oil, and the adjusting component includes a regulating valve body located inside the oil hole, and an auxiliary heat dissipation mechanism is provided on the piston rod, and the auxiliary heat dissipation mechanism includes a spray sleeve sleeved on the outside of the cylinder body, which performs auxiliary heat dissipation by spraying cooling water.

[0005] As a preferred solution, the auxiliary heat dissipation mechanism includes a connecting box arranged on the piston rod, the connecting box and the spray sleeve are connected by a bracket, and a transmission pipe is connected between the connecting box and the spray sleeve. The spray sleeve is simultaneously sleeved on the outside of the cylinder body and the oil pipe, and a spray hole is opened in the sleeve area.

[0006] As a preferred solution, an air pressure detector is provided on the cylinder body and located in the air chamber area, for detecting the air pressure in the air chamber; when insufficient air pressure is detected, the auxiliary mechanism is supported to perform auxiliary buffering.

[0007] As a preferred solution, the support auxiliary mechanism includes a mounting sleeve arranged at the bottom end of the cylinder body, a sliding column is telescopically arranged inside the mounting sleeve, a buffer spring is connected between the bottom end of the sliding column and the mounting sleeve, the top end of the sliding column is fixedly connected to the buffer plate, and a fixing hole is opened on the circumference of the sliding column, and the fixing hole cooperates with the fixing mechanism for fixation.

[0008] As a preferred solution, the fixing mechanism includes an electromagnetic sliding shaft 1 arranged on the buffer plate, and a push wheel slidably arranged on the buffer plate. The electromagnetic sliding shaft 1 is used to control the movement of the push wheel. A fixed shaft is telescopically arranged at the bottom end of the buffer plate. The fixed shaft is slidably connected to the mounting sleeve. A spring 2 is connected between the fixed shaft and the buffer plate, and a pushing part is provided at the end of the fixed shaft. The pushing part is pushed by the push wheel and cooperates with the fixing hole through the fixed shaft for fixation.

[0009] As a preferred solution, the adjustment component includes an electromagnetic sliding shaft 2 arranged inside the adjustment seat, and a rack frame slidably arranged inside the adjustment seat. The rack frame is controlled to move by the electromagnetic sliding shaft 2. Gear 2 is rotatably installed inside the adjustment seat, and gear 2 is engaged with the rack frame.

[0010] As a preferred solution, the gear 2 is provided with a toothed disk, which rotates inside the adjustment seat and is arrayed with a gear 1, which is engaged with the toothed disk. A connecting rod is provided on the gear 1, and one end of the connecting rod is connected to the regulating valve body.

[0011] As a preferred solution, a pressure plate is telescopically arranged inside the adjustment seat, a contact portion is provided on the pressure plate, and control wheels are respectively provided on both sides of the rack frame. The control wheels are used to push the contact portion to make the pressure plate slide. A clamping ring is provided at the bottom end of the pressure plate. The clamping ring is used to clamp and fix the connecting rod, and a spring three is connected between the pressure plate and the adjustment seat.

[0012] Compared with the prior art, the present invention has the following advantages: (1) Gear 2 and the pressure plate rotate, and then gear 1 and the regulating valve body rotate. After the regulating valve body is deflected at an angle, the size of the oil flow aperture can be adjusted, and then the resistance can be adjusted. That is, in terms of the oil flow aperture adjustment, the present invention can be adjusted in different areas. The first is the flow of oil between different oil chambers, and the second is the flow of oil between the oil chamber and the floating piston. The mutual coordinated adjustment can accurately control the flow rate of oil between different oil chambers; (2) The air pressure detector monitors the air pressure in the air chamber in real time. When leakage occurs, that is, the air pressure is insufficient, the gas cannot cooperate with the oil to absorb energy and buffer. At this time, the electromagnetic slide is used to adjust the oil flow aperture. The moving shaft controls the movement of the push wheel, which pushes the push part, and then the fixed shaft moves radially, that is, the fixation of the sliding column is released, and the buffer spring is in the energy storage state. When the fixation of the sliding column is released, the buffer spring and the sliding column move, causing the buffer plate to move upward, that is, to be located in the moving stroke area of ​​the floating piston. When the floating piston moves and contacts the buffer plate, it can play an auxiliary energy absorption and buffering role; (3) When the cylinder body and the piston rod move relative to each other, the spray sleeve moves outside the cylinder body, and the connecting box is connected to the external cooling water and transmitted to the spray sleeve. The spray sleeve sprays the cold zone water on the outside of the cylinder body and the oil pipe, which can assist in heat dissipation and also wash away impurities attached to the outside of the cylinder body and the oil pipe, which is beneficial to the heat dissipation operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 This is a schematic diagram of the installation structure of the spray sleeve of the present invention.

[0015] Figure 3 It is a schematic diagram of the outer side installation structure of the cylinder body of the present invention.

[0016] Figure 4 It is a schematic diagram of the cross-sectional structure of the cylinder body of the present invention.

[0017] Figure 5 It is a schematic diagram of the internal installation structure of the cylinder body of the present invention.

[0018] Figure 6 This is a schematic diagram of the sliding column installation structure of the present invention.

[0019] Figure 7 It is a structural schematic diagram of the fixing mechanism of the present invention.

[0020] Figure 8 It is a structural schematic diagram of the adjustment seat of the present invention.

[0021] Figure 9 This is a schematic diagram of the internal installation structure of the adjustment seat of the present invention.

[0022] Figure 10It is a schematic structural diagram of the regulating component of the present invention.

[0023] Figure 11 It is a schematic diagram of the pressure plate structure of the present invention.

[0024] Figure markings: 1-cylinder body; 101-air pressure detector; 2-piston rod; 3-connecting box; 4-bracket; 5-spray sleeve; 6-transmission pipe; 7-oil pipe; 8-regulating valve; 9-floating piston; 10-piston; 11-adjusting seat; 12-buffer plate; 13-mounting sleeve; 14-sliding column; 15-buffer spring; 16-electromagnetic sliding shaft one; 17-fixed shaft; 18-push wheel; 19-pushing part; 20-spring two; 21-oil hole; 22-regulating valve body; 23-gear one; 24-rack frame; 25-electromagnetic sliding shaft two; 26-control wheel; 27-gear two; 28-toothed disc; 29-pressure plate; 30-contact part; 31-connecting rod; 32-clamping ring; 33-spring three. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and examples; it should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application; unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs; it should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] like Figures 1 to 11As shown, a landing gear buffer device includes a cylinder body 1, a piston rod 2 is slidably fitted on the cylinder body 1, and a piston 10 is provided on the inner end surface of the piston rod 2. An adjustment seat 11 is provided inside the cylinder body 1, and a floating piston 9 is provided below the adjustment seat 11. The upper and lower sides of the piston 10 are respectively oil chambers, and the two oil chambers are connected by an oil pipe 7. A regulating valve 8 is provided between the oil pipe 7 and the oil chamber; the upper and lower sides of the floating piston 9 are respectively an oil chamber and an air chamber; a support buffer mechanism is provided at the bottom end of the air chamber. Structure, the supporting buffer mechanism includes a buffer plate 12, and a fixing mechanism is provided at the bottom end of the buffer plate 12 for fixing the buffer plate 12 to the bottom end of the air chamber; an array of oil holes 21 are opened on the adjusting seat 11, and an adjusting component is provided inside the adjusting seat 11 for adjusting the flow aperture of the oil, and the adjusting component includes a regulating valve body 22 located inside the oil hole 21, and an auxiliary heat dissipation mechanism is provided on the piston rod 2, and the auxiliary heat dissipation mechanism includes a spray sleeve 5 mounted on the outside of the cylinder body 1, which sprays cooling water to perform auxiliary heat dissipation.

[0027] The auxiliary heat dissipation mechanism includes a connecting box 3 arranged on the piston rod 2. The connecting box 3 and the spray sleeve 5 are connected by a bracket 4, and a transmission pipe 6 is connected between the connecting box 3 and the spray sleeve 5. The spray sleeve 5 is simultaneously sleeved on the outside of the cylinder body 1 and the oil pipe 7, and a spray hole is opened in the sleeve area.

[0028] An air pressure detector 101 is provided on the cylinder body 1 and in the air chamber area, which is used to detect the air pressure in the air chamber; when insufficient air pressure is detected, the support auxiliary mechanism performs auxiliary buffering; the support auxiliary mechanism includes a mounting sleeve 13 arranged at the bottom end of the cylinder body 1, and a sliding column 14 is telescopically arranged inside the mounting sleeve 13. A buffer spring 15 is connected between the bottom end of the sliding column 14 and the mounting sleeve 13. The top end of the sliding column 14 is fixedly connected to the buffer plate 12, and a fixing hole is opened on the circumference of the sliding column 14, and the fixing hole cooperates with the fixing mechanism for fixation.

[0029] The fixing mechanism includes an electromagnetic sliding shaft 16 arranged on the buffer plate 12, and a push wheel 18 slidably arranged on the buffer plate 12. The electromagnetic sliding shaft 16 is used to control the movement of the push wheel 18. A fixed shaft 17 is telescopically arranged at the bottom end of the buffer plate 12. The fixed shaft 17 is slidably connected to the mounting sleeve 13. A spring 20 is connected between the fixed shaft 17 and the buffer plate 12, and a pushing part 19 is provided at the end of the fixed shaft 17. The pushing part 19 is pushed by the push wheel 18 and cooperates with the fixing hole through the fixed shaft 17 for fixation.

[0030] The adjustment component includes an electromagnetic sliding shaft 25 arranged inside the adjustment seat 11, and a rack frame 24 slidingly arranged inside the adjustment seat 11. The rack frame 24 is controlled to move by the electromagnetic sliding shaft 25. A gear 27 is installed to rotate inside the adjustment seat 11, and the gear 27 is meshed with the rack frame 24; a toothed disc 28 is provided on the gear 27, and a gear 1 23 is arranged to rotate inside the adjustment seat 11 and meshed with the toothed disc 28. A connecting rod 31 is provided, one end of which is connected to the regulating valve body 22; a pressure plate 29 is also telescopically provided inside the adjusting seat 11, and a contact portion 30 is provided on the pressure plate 29. Control wheels 26 are respectively provided on both sides of the rack frame 24. The control wheels 26 are used to push the contact portion 30 to make the pressure plate 29 slide. A clamping ring 32 is provided at the bottom end of the pressure plate 29. The clamping ring 32 is used to clamp and fix the connecting rod 31, and a spring 33 is connected between the pressure plate 29 and the adjusting seat 11.

[0031] Working principle: When the landing gear touches the ground, the piston rod 2 and the cylinder 1 move relative to each other, and the piston 10 moves inside the cylinder 1, pushing the oil. The pressure of the oil chamber below the piston 10 increases, and the oil flows from the oil pipe 7, that is, it is transferred from the lower chamber to the upper chamber. At the same time, the oil passes through the oil hole 21 on the adjustment seat 11, pushing the floating piston 9. The pressure of the gas chamber below the floating piston 9 increases, and the gas is compressed; the impact force is absorbed by the synergistic effect of the oil and gas; when the oil is transferred through the oil pipe 7, the flow aperture of the oil can be adjusted by the regulating valve 8 to adjust the flow resistance, and then adjust the resistance. The resistance of the damper is controlled by electromagnetic sliding shaft 25. The rack frame 24 can be moved by electromagnetic sliding shaft 25. Under gear transmission, gear 27 and pressure plate 29 rotate, which in turn rotates gear 1 23 and regulating valve body 22. After the regulating valve body 22 is angularly deflected, the oil flow aperture can be adjusted, thereby adjusting the resistance. Specifically, in terms of oil flow aperture adjustment, this embodiment can adjust the oil flow aperture in different areas: first, the flow of oil between different oil chambers, and second, the flow of oil between the oil chambers and the floating piston 9. These coordinated adjustments can precisely control the flow rate of oil between the different oil chambers. This allows the damper's response characteristics to be adjusted according to working requirements, thereby optimizing the damping effect. By coordinating the flow apertures in the two areas, a smoother and more controllable oil flow can be achieved, thereby reducing vibration and impact and improving the damping effect. Furthermore, unnecessary friction and overheating caused by excessive oil flow can be avoided, thereby extending the service life of the damper and reducing maintenance costs.

[0032] Furthermore, the electromagnetic sliding shaft 25 controls the movement of the rack frame 24, and the rack frame 24 unidirectionally drives the gear 2 27 to rotate. When the angle of the regulating valve body 22 needs to be adjusted, the rack frame 24 moves, and the control wheel 26 lifts and pushes the contact part 30, that is, the clamping ring 32 releases the pressure on the connecting rod 31. After the adjustment is completed, the control wheel 26 presses and pushes the contact part 30, so that the clamping ring 32 presses the connecting rod 31 to fix it.

[0033] Furthermore, the air pressure detector 101 monitors the air pressure in the air chamber in real time. When leakage occurs, that is, the air pressure is insufficient, the gas cannot cooperate with the oil to absorb energy and buffer. At this time, the electromagnetic sliding shaft 16 controls the movement of the push wheel 18, and the push wheel 18 pushes the pushing part 19, thereby the fixed shaft 17 moves radially, that is, the fixation of the sliding column 14 is released, and the buffer spring 15 is in the energy storage state. When the fixation of the sliding column 14 is released, the buffer spring 15 and the sliding column 14 move, causing the buffer plate 12 to move upward, that is, located in the moving stroke area of ​​the floating piston 9. When the floating piston 9 moves and contacts the buffer plate 12, it can play an auxiliary role in energy absorption and buffering.

[0034] Furthermore, when the cylinder body 1 and the piston rod 2 move relative to each other, the spray sleeve 5 moves outside the cylinder body 1, and the connecting box 3 is connected to the external cooling water and transmitted to the spray sleeve 5. The spray sleeve 5 sprays the cold zone water on the outside of the cylinder body 1 and the oil pipe 7, which can assist in heat dissipation and also wash away impurities attached to the outside of the cylinder body 1 and the oil pipe 7, which is beneficial to the heat dissipation operation.

[0035] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A landing gear buffer device, comprising a cylinder (1), a piston rod (2) slidably fitted on the cylinder (1), and a piston (10) provided on the inner end surface of the piston rod (2) located on the cylinder (1); characterized in that: An adjusting seat (11) is provided inside the cylinder body (1), a floating piston (9) is provided below the adjusting seat (11), the upper and lower sides of the piston (10) are respectively oil chambers, the two oil chambers are connected through an oil pipe (7), and a regulating valve (8) is provided between the oil pipe (7) and the oil chamber; the upper and lower sides of the floating piston (9) are respectively oil chambers and air chambers; a supporting buffer mechanism is provided at the bottom end of the air chamber, the supporting buffer mechanism includes a buffer plate (12), and the bottom end of the buffer plate (12) is provided with A fixing mechanism is used to fix the buffer plate (12) at the bottom end of the air chamber; an array of oil holes (21) are opened on the adjustment seat (11); an adjusting component is provided inside the adjustment seat (11) for adjusting the flow aperture of the oil, the adjusting component includes a regulating valve body (22) located inside the oil hole (21); an auxiliary heat dissipation mechanism is provided on the piston rod (2), and the auxiliary heat dissipation mechanism includes a spray sleeve (5) sleeved on the outside of the cylinder body (1) for spraying cooling water to perform auxiliary heat dissipation.

2. The landing gear buffer device according to claim 1, characterized in that: The auxiliary heat dissipation mechanism includes a connecting box (3) arranged on the piston rod (2), the connecting box (3) and the spray sleeve (5) are connected via a bracket (4), and a transmission pipe (6) is connected between the connecting box (3) and the spray sleeve (5), and the spray sleeve (5) is simultaneously sleeved on the outside of the cylinder body (1) and the oil pipe (7), and a spray hole is opened in the sleeve area.

3. The landing gear buffer device according to claim 1, characterized in that: An air pressure detector (101) is provided on the cylinder body (1) and located in the air chamber area, for detecting the air pressure in the air chamber; when insufficient air pressure is detected, the auxiliary mechanism is supported to perform auxiliary buffering.

4. The landing gear buffer device according to claim 3, characterized in that: The supporting auxiliary mechanism comprises a mounting sleeve (13) arranged at the bottom end of the cylinder body (1), a sliding column (14) is telescopically arranged inside the mounting sleeve (13), a buffer spring (15) is connected between the bottom end of the sliding column (14) and the mounting sleeve (13), the top end of the sliding column (14) is fixedly connected to the buffer plate (12), and a fixing hole is opened on the circumference of the sliding column (14), and the fixing hole cooperates with the fixing mechanism for fixing.

5. The landing gear buffer device according to claim 4, characterized in that: The fixing mechanism includes an electromagnetic sliding shaft (16) arranged on the buffer plate (12), and a push wheel (18) slidably arranged on the buffer plate (12), the electromagnetic sliding shaft (16) is used to control the movement of the push wheel (18), a fixed shaft (17) is telescopically arranged at the bottom end of the buffer plate (12), the fixed shaft (17) is slidably connected to the mounting sleeve (13), a spring (20) is connected between the fixed shaft (17) and the buffer plate (12), and a pushing part (19) is provided at the end of the fixed shaft (17), the pushing part (19) is pushed by the push wheel (18), and is matched with the fixing hole through the fixed shaft (17) for fixing.

6. The landing gear buffer device according to claim 1, characterized in that: The adjusting component includes an electromagnetic sliding shaft 2 (25) arranged inside the adjusting seat (11), and a rack frame (24) slidably arranged inside the adjusting seat (11). The rack frame (24) is controlled to move by the electromagnetic sliding shaft 2 (25). A gear 2 (27) is rotatably installed inside the adjusting seat (11), and the gear 2 (27) is engaged with the rack frame (24).

7. The landing gear buffer device according to claim 6, characterized in that: The gear 2 (27) is provided with a toothed disc (28) and rotates inside the regulating seat (11) and is arranged with a gear 1 (23). The gear 1 (23) is meshed with the toothed disc (28). The gear 1 (23) is provided with a connecting rod (31), and one end of the connecting rod (31) is connected to the regulating valve body (22).

8. The landing gear buffer device according to claim 7, characterized in that: A pressure plate (29) is telescopically provided inside the adjusting seat (11), and a contact portion (30) is provided on the pressure plate (29). Control wheels (26) are provided on both sides of the rack frame (24), and the control wheels (26) are used to push the contact portion (30) to slide the pressure plate (29). A clamping ring (32) is provided at the bottom end of the pressure plate (29), and the clamping ring (32) is used to clamp and fix the connecting rod (31), and a spring (33) is connected between the pressure plate (29) and the adjusting seat (11).

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