Landing gear shock absorber

Abstract

The application discloses a landing gear buffer device and relates to the technical field of landing gear buffers; the device comprises a cylinder body, a piston rod is slidably connected to the cylinder body, and a piston is arranged on the inner side end face 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, the supporting and buffering mechanism comprises a buffering plate, a fixing mechanism is arranged at the bottom end of the buffering plate, oil holes are arrayed on the adjusting seat, an adjusting part is arranged in the adjusting seat and is used for adjusting the flow aperture of oil, the adjusting part comprises an adjusting valve body arranged 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, and the spraying sleeve sprays cooling water to assist heat dissipation; the device can realize auxiliary heat dissipation of the buffer and can provide emergency auxiliary supporting and buffering when the air pressure in the buffer is unstable.

Description

Technical Field

[0001] This invention relates to the field of landing gear buffer technology, and particularly to a landing gear buffer device. Background Technology

[0002] Landing gear dampers, also known as landing gear shock absorbers or landing gear hydraulic dampers, are an important component of aircraft landing gear systems. They are used to mitigate the impact load on the landing gear during landing or takeoff, protecting the aircraft structure and improving passenger comfort. Their main function is to absorb and mitigate the enormous impact force generated by the landing gear during landing. Landing gear dampers typically use hydraulic systems to provide damping, combined with springs or gas pressure to absorb impact. Current landing gear dampers generally absorb the vertical impact force during landing through the synergistic action of hydraulics and gas. With the repeated movement of the piston inside the damper and the continuous compression of the hydraulic fluid and gas, a significant amount of heat is generated. Although there is a high airflow velocity outside, impurities adhering to the damper can affect heat dissipation. Furthermore, if there are leaks or other issues with the air pressure in the damper's air chambers, the unstable air pressure prevents the gas from working synergistically with the hydraulic fluid, significantly impacting the damping operation. Therefore, this invention proposes a damper that can provide auxiliary heat dissipation and emergency auxiliary support and damping when the internal air pressure of the damper is unstable. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention can provide auxiliary heat dissipation for the buffer and provide emergency auxiliary support and buffering when the internal air pressure of the buffer is unstable.

[0004] The present invention provides a landing gear buffer device comprising a cylinder body, a piston rod slidably fitted on the cylinder body, and a piston located on the inner end face of the piston rod; an adjusting seat is provided inside the cylinder body, and a floating piston is provided below the adjusting seat; the upper and lower sides of the piston are oil chambers, which are connected by an oil pipe, and an adjusting valve is provided between the oil pipe and the oil chambers; the upper and lower sides of the floating piston are an oil chamber and an air chamber, respectively; a supporting buffer mechanism is provided at the bottom of the air chamber, the supporting buffer mechanism including a buffer plate, and a fixing mechanism at the bottom of the buffer plate for fixing the buffer plate to the bottom of the air chamber; oil holes are arrayed on the adjusting seat, and an adjusting component is provided inside the adjusting seat for adjusting the flow diameter of the oil holes, the adjusting component including an adjusting valve body located inside the oil holes; an auxiliary heat dissipation mechanism is provided on the piston rod, the auxiliary heat dissipation mechanism including a spray sleeve sleeved on the outside of the cylinder body, which sprays cooling water for auxiliary heat dissipation.

[0005] As a preferred embodiment, the auxiliary heat dissipation mechanism includes a connecting box mounted on the piston rod, which is connected to the spray sleeve via a bracket, and a transmission pipe is connected between the connecting box and the spray sleeve. The spray sleeve is fitted onto both the cylinder body and the oil pipe, and spray holes are provided in the fitted area.

[0006] As a preferred embodiment, a pressure detector is provided on the cylinder body and located in the air chamber area to detect the air pressure in the air chamber; when insufficient air pressure is detected, a support auxiliary mechanism provides auxiliary buffering.

[0007] As a preferred embodiment, the support auxiliary mechanism includes a mounting sleeve disposed at the bottom of the cylinder body, a sliding column telescopically disposed inside the mounting sleeve, a buffer spring connected between the bottom end of the sliding column and the mounting sleeve, the top end of the sliding column being fixedly connected to a buffer plate, and a fixing hole being provided on the circumference of the sliding column, the fixing hole cooperating with a fixing mechanism for fixing.

[0008] As a preferred embodiment, the fixing mechanism includes an electromagnetic sliding shaft 1 disposed on the buffer plate and a pusher wheel slidably disposed on the buffer plate. The electromagnetic sliding shaft 1 is used to control the movement of the pusher wheel. A fixed shaft is telescopically disposed 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. A pushing part is disposed at the end of the fixed shaft. The pushing part is pushed by the pusher wheel. The fixed shaft cooperates with the fixing hole to perform fixing.

[0009] As a preferred embodiment, the adjusting component includes an electromagnetic sliding shaft II disposed inside the adjusting seat, and a rack frame slidably disposed inside the adjusting seat. The rack frame is controlled to move by the electromagnetic sliding shaft II. A gear II is rotatably mounted inside the adjusting seat, and the gear II meshes with the rack frame.

[0010] As a preferred embodiment, the second gear is provided with a gear disc, and the first gear is arranged in an array inside the adjusting seat, the first gear meshes with the gear disc, and the first gear is provided with a connecting rod, one end of which is connected to the adjusting valve body.

[0011] As a preferred embodiment, the adjusting seat is further provided with a pressure plate that can be telescopically installed inside. The pressure plate is provided with a contact part, and control wheels are provided on both sides of the rack frame. The control wheels are used to push the contact part to make the pressure plate slide. A clamping ring is provided at the bottom of the pressure plate. The clamping ring is used to clamp and fix the connecting rod, and a spring is connected between the pressure plate and the adjusting seat.

[0012] The beneficial effects of this invention compared with the prior art are: (1) Gear 2 and pressure plate rotate, and then gear 1 and regulating valve body rotate. After the regulating valve body is deflected at an angle, the size of the oil flow orifice can be adjusted, and thus the resistance can be adjusted. That is, in terms of oil flow orifice adjustment, this 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 coordination and 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, when the air pressure is insufficient, the gas cannot work with the oil to absorb energy and buffer. At this time, the electromagnetic sliding The moving shaft controls the movement of the push wheel, which pushes the push part, thereby fixing the shaft radially, that is, releasing the fixation of the slide column. The buffer spring is in an energy storage state. When the fixation of the slide column is released, the buffer spring and the slide column move, causing the buffer plate to move upward, that is, within the movement stroke area of ​​the floating piston. When the floating piston moves and contacts the buffer plate, it can play an auxiliary role in energy absorption and buffering. (3) When the cylinder and piston rod move relative to each other, the spray sleeve moves outside the cylinder. The connecting box transmits external cooling water to the spray sleeve. The spray sleeve sprays cold water on the outside of the cylinder and oil pipe, which can assist in heat dissipation and also wash away impurities attached to the outside of the cylinder and oil pipe, which is beneficial for heat dissipation operation. Attached Figure Description

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

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

[0015] Figure 3 This is a schematic diagram of the mounting structure on the outer side of the cylinder body of the present invention.

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

[0017] Figure 5 This is a schematic diagram of the internal installation structure of the cylinder block 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 This is a schematic diagram of the fixing mechanism of the present invention.

[0020] Figure 8 This is a schematic diagram of the adjusting seat structure 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 10This is a schematic diagram of the adjusting component structure of the present invention.

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

[0024] Reference numerals: 1-Cylinder body; 101-Air pressure detector; 2-Piston rod; 3-Connecting box; 4-Bracket; 5-Spraying 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-Gear disc; 29-Pressure plate; 30-Contact part; 31-Connecting rod; 32-Pressure ring; 33-Spring three. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" 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 1, a piston rod 2 slidably fitted on the cylinder 1, and a piston 10 disposed on the inner end face of the piston rod 2; an adjusting seat 11 is disposed inside the cylinder 1, and a floating piston 9 is disposed below the adjusting seat 11; the upper and lower sides of the piston 10 are oil chambers, which are connected by an oil pipe 7, and an adjusting valve 8 is disposed between the oil pipe 7 and the oil chambers; the upper and lower sides of the floating piston 9 are an oil chamber and an air chamber, respectively; a supporting buffer is disposed at the bottom end of the air chamber. The structure includes a buffer plate 12, with a fixing mechanism at the bottom of the buffer plate 12 for fixing the buffer plate 12 to the bottom of the air chamber; oil holes 21 are arrayed on the adjusting seat 11, and an adjusting component is provided inside the adjusting seat 11 for adjusting the flow diameter of the oil; the adjusting component includes an adjusting valve body 22 located inside the oil holes 21; an auxiliary heat dissipation mechanism is provided on the piston rod 2, which includes a spray sleeve 5 sleeved on the outside of the cylinder body 1 for auxiliary heat dissipation by spraying cooling water.

[0027] The auxiliary heat dissipation mechanism includes a connecting box 3 installed on the piston rod 2. The connecting box 3 is connected to the spray sleeve 5 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 fitted on the outside of the cylinder body 1 and the oil pipe 7, and spray holes are opened in the fitted area.

[0028] A pressure detector 101 is installed on the cylinder body 1 and located in the air chamber area to detect the air pressure in the air chamber. When insufficient air pressure is detected, a support auxiliary mechanism provides auxiliary buffering. The support auxiliary mechanism includes a mounting sleeve 13 located at the bottom of the cylinder body 1. A sliding column 14 is telescopically installed 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. A fixing hole is opened on the circumference of the sliding column 14. The fixing hole cooperates with the fixing mechanism for fixing.

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

[0030] The adjusting component includes an electromagnetic sliding shaft 25 disposed inside the adjusting seat 11, and a rack frame 24 slidably disposed inside the adjusting seat 11. The rack frame 24 is controlled to move by the electromagnetic sliding shaft 25. A gear 27 is rotatably mounted inside the adjusting seat 11 and meshes with the rack frame 24. A gear disk 28 is disposed on the gear 27, and a gear 23 is arranged in an array rotatably inside the adjusting seat 11. The gear 23 meshes with the gear disk 28. A gear 23 is provided with... 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 regulating seat 11, and a contact part 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 part 30 to make the pressure plate 29 slide. A clamping ring 32 is provided at the bottom 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 regulating seat 11.

[0031] Operating principle: When the landing gear contacts the ground, piston rod 2 and cylinder 1 move relative to each other, and piston 10 moves inside cylinder 1, pushing the hydraulic fluid. The pressure in the oil chamber below piston 10 increases, causing the hydraulic fluid to flow from the hydraulic pipe 7, transferring from the lower chamber to the upper chamber. Simultaneously, the hydraulic fluid passes through the oil hole 21 on the adjusting seat 11, pushing the floating piston 9. The pressure in the gas chamber below the floating piston 9 increases, and the gas is compressed. Through the synergistic effect of the hydraulic fluid and gas, the impact force is absorbed. As the hydraulic fluid transfers through the hydraulic pipe 7, the flow orifice diameter can be adjusted via the adjusting valve 8 to regulate the flow resistance, thereby adjusting the overall resistance. The resistance of the damper can be adjusted. Furthermore, the rack frame 24 can be moved by the electromagnetic sliding shaft 25. Under gear transmission, gear 27 and pressure plate 29 rotate, which in turn causes gear 23 and regulating valve body 22 to rotate. After the regulating valve body 22 deflects at an angle, the size of the oil flow orifice can be adjusted, thereby adjusting the resistance. In this embodiment, the oil flow orifice adjustment can be performed in different areas: first, the flow of oil between different oil chambers; second, the flow of oil between the oil chamber and the floating piston 9. This coordinated adjustment allows for precise control of the oil flow rate between different oil chambers. This allows for adjustment of the damper's response characteristics according to operational requirements, thereby optimizing the damping effect. By coordinating the adjustment of the flow orifice in both areas, a smoother and more controllable oil flow can be achieved, reducing vibration and impact and improving the damping effect. It also avoids unnecessary friction and overheating caused by excessively fast oil flow, thus extending the damper's service life and reducing maintenance costs.

[0032] Furthermore, the electromagnetic sliding shaft 25 controls the rack frame 24 to move, and the rack frame 24 drives the gear 27 to rotate in one direction. When it is necessary to adjust the angle of the regulating valve body 22, 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 clamping 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 clamps the connecting rod 31 and fixes it.

[0033] Furthermore, the air pressure detector 101 monitors the air pressure in the air chamber in real time. When leakage occurs, i.e., insufficient air pressure, the gas cannot work with the oil to absorb energy and buffer. At this time, the push wheel 18 is moved by the electromagnetic sliding shaft 16. The push wheel 18 pushes the push part 19, thereby moving the fixed shaft 17 radially, i.e. releasing the fixation of the sliding column 14. The buffer spring 15 is in an energy storage state. After 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, i.e., to be located within the movement 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 absorbing energy and buffering.

[0034] Furthermore, when the cylinder 1 and piston rod 2 move relative to each other, the spray sleeve 5 moves outside the cylinder 1. The connecting box 3 transmits external cooling water to the spray sleeve 5. The spray sleeve 5 sprays the cooling water onto the outside of the cylinder 1 and oil pipe 7, which can assist in heat dissipation and also wash away impurities attached to the outside of the cylinder 1 and oil pipe 7, thus facilitating heat dissipation.

[0035] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this 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 without creative effort based on the technical solutions of the present invention 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) disposed on the inner end face of the piston rod (2); characterized in that: An adjusting seat (11) is provided inside the cylinder (1), and a floating piston (9) is provided below the adjusting seat (11). The upper and lower sides of the piston (10) are oil chambers, which are connected by an oil pipe (7). An adjusting valve (8) is provided between the oil pipe (7) and the oil chambers. The upper and lower sides of the floating piston (9) are an oil chamber and an air chamber, respectively. A support and buffer mechanism is provided at the bottom of the air chamber. The support and buffer mechanism includes a buffer plate (12), and a buffer plate (12) is provided at the bottom of the buffer plate (12). A fixing mechanism is used to fix the buffer plate (12) to the bottom of the air chamber; oil holes (21) are arrayed on the adjusting seat (11), and an adjusting component is provided inside the adjusting seat (11) to adjust the flow orifice diameter of the oil. The adjusting component includes an adjusting valve body (22) located inside the oil hole (21). An auxiliary heat dissipation mechanism is provided on the piston rod (2). The auxiliary heat dissipation mechanism includes a spray sleeve (5) sleeved on the outside of the cylinder body (1) to perform auxiliary heat dissipation by spraying cooling water. A pressure detector (101) is provided on the cylinder (1) and located in the air chamber area to detect the air pressure in the air chamber; when insufficient air pressure is detected, the support auxiliary mechanism provides auxiliary buffering. The supporting auxiliary mechanism includes an installation sleeve (13) located at the bottom of the cylinder (1). A sliding column (14) is telescopically installed inside the installation sleeve (13). A buffer spring (15) is connected between the bottom end of the sliding column (14) and the installation sleeve (13). The top end of the sliding column (14) is fixedly connected to the buffer plate (12). A fixing hole is provided on the circumference of the sliding column (14). The fixing hole cooperates with the fixing mechanism for fixing. The fixing mechanism includes an electromagnetic sliding shaft (16) set on the buffer plate (12) and a pusher (18) slidably set on the buffer plate (12). The electromagnetic sliding shaft (16) is used to control the movement of the pusher (18). A fixed shaft (17) is telescopically set 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). A pushing part (19) is set at the end of the fixed shaft (17). The pushing part (19) is pushed by the pusher (18). The fixed shaft (17) is engaged with the fixing hole to fix it.

2. The landing gear buffer device according to claim 1, characterized in that: The auxiliary heat dissipation mechanism includes a connecting box (3) set 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 sleeved area.

3. The landing gear buffer device according to claim 1, characterized in that: The adjustment component includes an electromagnetic sliding shaft 2 (25) disposed inside the adjustment seat (11) and a rack frame (24) slidably disposed inside the adjustment 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 adjustment seat (11) and meshes with the rack frame (24).

4. A landing gear buffer device according to claim 3, characterized in that: The gear two (27) is provided with a gear disc (28), and a gear one (23) is arranged inside the adjusting seat (11) and rotates. The gear one (23) meshes with the gear disc (28). A connecting rod (31) is provided on the gear one (23), and one end of the connecting rod (31) is connected to the adjusting valve body (22).

5. A landing gear buffer device according to claim 4, characterized in that: The adjusting seat (11) is also equipped with a pressure plate (29) that can be telescopically extended. The pressure plate (29) is provided with a contact part (30). Control wheels (26) are provided on both sides of the rack frame (24). The control wheels (26) are used to push the contact part (30) so that the pressure plate (29) can slide. A clamping ring (32) is provided at the bottom of the pressure plate (29). The clamping ring (32) is used to clamp the fixed connecting rod (31). A spring (33) is connected between the pressure plate (29) and the adjusting seat (11).

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