Single-cavity oil liquid type frame stabilizing buffer

Abstract

The invention belongs to the field of airplane structure design, and particularly relates to a single-cavity oil liquid type frame stabilizing buffer which comprises an end cover, an outer cylinder, a piston assembly, a supporting sleeve and an oil liquid adjusting system. The piston assembly comprises a large piston, a moving piston and a piston rod. The piston rod is coaxially connected with the large piston; the floating piston is connected with the large piston; a sealing oil cavity is formed between the end cover and the outer cylinder, and the large piston is arranged in the sealing oil cavity. The piston rod can drive the large piston to axially move; one end of the outer cylinder is connected with the end cover, and the other end is connected with the supporting sleeve; the oil liquid adjusting system is connected with the sealing oil cavity and can supply pressure to the sealing oil cavity. An oil cavity is formed by the outer cylinder, the piston and the movable floating plug and can limit extension and shortening of the piston rod, the stable buffer is in the neutral length when the oil cavity is pressurized, and the structure is simple. And compared with a multi-cavity structure, the size and the weight of the device are remarkably reduced, and the lightweight requirement of aircrafts is met.

Description

Technical Field

[0001] This application belongs to the field of aircraft structural design, and specifically relates to a single-chamber oil-lubricated frame stabilizing buffer. Background Technology

[0002] Chassis stabilization dampers are essential functional components of large chassis-type landing gear. In practical applications, depending on the landing gear and chassis, chassis stabilization dampers primarily function to maintain chassis attitude, control attitude, and dampen chassis pitch.

[0003] This type of stabilizer is connected to the hydraulic power source on the machine, which can provide the frame center position holding and restoring force for frame attitude control. At the same time, the external one-way throttle valve provides a certain degree of damping to the flow of oil when the stabilizer is passively stretched.

[0004] Therefore, designing a more effective stable buffer is a problem that needs to be solved. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a single-chamber hydraulic frame stabilizer to solve the problem of slow damping adjustment in existing stabilizers.

[0006] The technical solution of this application is: a single-chamber oil-type frame stabilizing buffer, including an end cap, an outer cylinder, a piston assembly, a support sleeve, and an oil adjustment system;

[0007] The piston assembly includes a large piston, a sliding piston, and a piston rod; the piston rod is coaxially connected to the large piston, and the sliding piston is connected to the large piston; a sealing oil cavity is provided between the end cap and the outer cylinder, and the large piston is located in the sealing oil cavity; the piston rod can drive the large piston to move axially.

[0008] One end of the outer cylinder is connected to the end cap, and the other end is connected to the support sleeve; the oil regulating system is connected to the sealing oil chamber, and the oil regulating system can supply pressure to the sealing oil chamber.

[0009] Preferably, the outer cylinder is in the form of a sleeve, open at both ends, with one end threaded; a hydraulic nozzle connector is provided on the outer circumference of the outer cylinder.

[0010] Preferably, the movable piston is connected to the end of the large piston, the movable piston slides in contact with the inner wall of the outer cylinder, and a sealing ring is provided between the movable piston and the inner wall of the outer cylinder.

[0011] Preferably, the oil regulating system includes a one-way throttle valve, a pressure relief valve, a safety valve, and a check valve; one end of the pressure relief valve is connected to the positive terminal of the one-way throttle valve and the other end is connected to the safety valve; the negative terminals of the safety valve and the one-way throttle valve are connected to the sealed oil chamber; the positive terminal of the check valve is connected to pressurized oil, and the negative terminal is connected to the sealed oil chamber.

[0012] Preferably, when the frame rotates unexpectedly, causing the sealed oil chamber to compress beyond the operating value, the pressure relief valve and the safety valve open simultaneously, connecting the two return oil paths to release the internal pressure of the oil chamber.

[0013] Preferably, the outer side of the support sleeve is provided with a flange, which is engaged with the inner wall of the outer cylinder.

[0014] Preferably, the piston rod is coaxially disposed between the floating piston and the support sleeve, and is capable of axial movement; when the piston rod retracts, it moves synchronously with the floating piston; when the piston rod extends, it extends together with the large piston.

[0015] Preferably, the large piston includes a piston head, a connecting head, and a stop; the piston head, the connecting shaft, and the stop are coaxially arranged, one end of the connecting shaft is detachably connected to the piston head, and the other end is detachably connected to the stop; the stop is connected to the floating piston.

[0016] Preferably, the piston rod and the connecting shaft are both hollow structures, connected to the atmosphere.

[0017] Preferably, the piston rod has an adjustable head at its end, which cooperates with the piston rod to allow for initial length adjustment.

[0018] The single-chamber hydraulic frame stabilizer of this application has the following advantages:

[0019] 1. The present application has an oil chamber composed of an outer cylinder, a piston, and a movable float, which can limit the extension and retraction of the piston rod. When the oil chamber is pressurized, the stable buffer is kept at a neutral length, and the structure is simple.

[0020] 2. A damping hole is designed between the oil chamber and the oil tank. When the oil chamber is passively compressed, the oil flows back to the oil tank through the damping hole, which plays a damping role and realizes the function of suppressing frame vibration.

[0021] 3. When the stabilizing buffer is passively stretched or passively compressed, the oil chamber is always compressed to discharge oil. Under pressure, the stabilizing buffer always tends to return to the neutral position. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this application;

[0023] Figure 2 This is a schematic diagram of the large piston structure of this application.

[0024] 1. End cap; 2. Large piston; 21. Piston head; 22. Connecting shaft; 23. Stop block; 3. Outer cylinder; 4. Floating piston; 5. Support sleeve; 6. Piston rod; 7. Adjustable head; 8. Atmosphere; 9. Sealing ring; 10. Sealing oil chamber; 11. One-way throttle valve; 12. Pressure relief valve; 13. Safety valve; 14. Check valve. Detailed Implementation

[0025] 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. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0026] The first aspect of this application provides a single-chamber hydraulic frame stabilizing damper, characterized in that, as Figures 1-2 It includes end cap 1, outer cylinder 3, piston assembly, support sleeve 5 and oil adjustment system.

[0027] The piston assembly includes a large piston 2, a floating piston 4, and a piston rod 6; the piston rod 6 is coaxially connected to the large piston 2, and the floating piston 4 is connected to the large piston 2; a sealing oil chamber 10 is provided between the end cap 1 and the outer cylinder 3, and the large piston 2 is located in the sealing oil chamber 10; the piston rod 6 can drive the large piston 2 to move axially.

[0028] One end of the outer cylinder 3 is connected to the end cap 1, and the other end is connected to the support sleeve 5; the oil regulating system is connected to the sealing oil chamber 10, and the oil regulating system can supply pressure to the sealing oil chamber 10.

[0029] The highly integrated single-cavity structure design is achieved through the organic combination of end cap 1, outer cylinder 3, piston assembly, and support sleeve 5. In use, the frame attitude maintenance, vibration damping, and position recovery functions are integrated into a single device. Compared with multi-cavity structures, this significantly reduces the size and weight of the device, meeting the lightweight requirements of aircraft; the simplified structure reduces the number of failure points and improves the overall system reliability.

[0030] Preferably, the outer cylinder 3 is in the form of a sleeve, with open ends and one end threaded; the outer circumference of the outer cylinder 3 is provided with a hydraulic nozzle connector, and the hydraulic nozzle connector on the outer circumference enables quick connection with the hydraulic system on the machine.

[0031] Preferably, the movable piston 4 is connected to the end of the large piston 2, the movable piston 4 slides with the inner wall of the outer cylinder 3, and a sealing ring 9 is provided between the movable piston 4 and the inner wall of the outer cylinder 3.

[0032] The sliding fit of the sealing ring 9 ensures long-term sealing stability of the oil chamber. The moving piston 4 is precisely fitted with the inner wall of the outer cylinder 3, reducing vibration and impact during movement. The optimized sealing structure reduces wear and extends the service life of the device.

[0033] The oil regulating system includes a one-way throttle valve 11, a pressure relief valve 12, a safety valve 13, and a one-way valve 14. One end of the pressure relief valve 12 is connected to the positive terminal of the one-way throttle valve 11, and the other end is connected to the safety valve 13. The negative terminals of the safety valve 13 and the one-way throttle valve 11 are connected to the sealed oil chamber 10. The positive terminal of the one-way valve 14 is connected to the pressurized oil, and the negative terminal is connected to the sealed oil chamber 10.

[0034] Two parallel return oil lines are connected to the sealing oil chamber 10. One line is connected to a one-way throttle valve 11 and a pressure relief valve 12. When the sealing oil chamber 10 is normally passively compressed and discharged, the liquid flows out. The single-chamber hydraulic frame stabilizer has one-way damping and opens the pressure relief valve 12 to connect the return oil. The other line is connected to a safety valve 13. When the frame rotates unexpectedly, causing the sealing oil chamber 10 to compress beyond the operating value, the pressure relief valve 12 and the safety valve 13 open simultaneously, and the two lines connect to the return oil, releasing the internal pressure of the sealing oil chamber 10 and achieving safety control.

[0035] Preferably, the outer side of the support sleeve 5 is provided with a flange, which is engaged with the inner wall of the outer cylinder 3. The flange design enhances the connection strength between the support sleeve 5 and the outer cylinder 3, and the engagement structure ensures accurate positioning of the support sleeve 5 and guarantees piston alignment.

[0036] The piston rod 6 is coaxially located between the floating piston 4 and the support sleeve 5, and can move axially; when the piston rod 6 retracts, it moves synchronously with the floating piston 4; when the piston rod 6 extends, it extends together with the large piston 2.

[0037] Preferably, the large piston 2 includes a piston head 21, a connecting head, and a stop block 23; the piston head 21, the connecting shaft 22, and the stop block 23 are coaxially arranged, one end of the connecting shaft 22 is detachably connected to the piston head 21, and the other end is detachably connected to the stop block 23, and the stop block 23 is connected to the floating piston 4. The detachable connection facilitates component replacement and maintenance, and each component can be independently optimized to improve overall performance.

[0038] Preferably, the piston rod 6 and the connecting shaft 22 are both hollow structures, connected to the atmosphere 8, to avoid air lock in the oil chamber.

[0039] Preferably, the end of the piston rod 6 is provided with an adjustable head 7. The adjustable head 7 cooperates with the piston rod 6 to adjust the initial length, which facilitates setting a suitable preload and optimizing the buffering effect.

[0040] The position holding function of the stabilizing buffer:

[0041] The oil pressure inside the sealed oil chamber acts on the large piston and the floating piston respectively. The large piston is pressed against the end cover, and the floating piston is pressed against the piston rod. Therefore, the movement of the piston rod relative to the outer cylinder is restricted in both directions, and the stabilizing buffer is in a neutral position at this time.

[0042] When the frame rotates passively, the stabilizing damper deviates from the neutral position. When the piston rod is passively compressed, the piston rod presses against the floating piston, and the hydraulic pressure acts on the floating piston, causing the piston rod to tend to extend and return to the neutral position. When the piston rod is passively extended, the piston rod pulls the large piston, and the hydraulic pressure acts on the large piston, causing the piston rod to tend to shorten and return to the neutral position.

[0043] Damping function of a stabilizing buffer:

[0044] When the frame rotates passively, the stabilizing damper deviates from the neutral position. The liquid in the sealing oil chamber is always compressed. When the pressure after the one-way throttle valve is greater than the opening pressure of the pressure relief valve, the liquid is discharged into the return oil tank. When the frame rotates unexpectedly, causing the sealing oil chamber to be compressed beyond the operating value, the pressure relief valve and the safety valve open simultaneously, connecting the two return oil paths to release the internal pressure of the sealing oil chamber. The liquid is damped by the one-way throttle valve, and the stabilizing damper tends to return to the neutral position.

[0045] After practical use on large civil aircraft, the results have proven that the application achieves the maintenance and control of the chassis position, while also achieving damping suppression when the piston rod of the chassis vibration stabilizing buffer is rapidly extended. It requires fewer external hydraulic accessories and has a simple structure.

[0046] In summary, this application has the following advantages:

[0047] 1. The present application has an oil chamber composed of an outer cylinder, a piston, and a movable float, which can limit the extension and retraction of the piston rod. When the oil chamber is pressurized, the stable buffer is kept at a neutral length, and the structure is simple.

[0048] 2. A damping hole is designed between the oil chamber and the oil tank. When the oil chamber is passively compressed, the oil flows back to the oil tank through the damping hole, which plays a damping role and realizes the function of suppressing frame vibration.

[0049] 3. When the stabilizing buffer is passively stretched or passively compressed, the oil chamber is always compressed to discharge oil. Under pressure, the stabilizing buffer always tends to return to the neutral position.

[0050] 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 single-chamber hydraulic frame stabilizer, characterized in that, It includes an end cap (1), an outer cylinder (3), a piston assembly, a support sleeve (5), and an oil conditioning system; The piston assembly includes a large piston (2), a floating piston (4), and a piston rod (6); the piston rod (6) is coaxially connected to the large piston (2), and the floating piston (4) is connected to the large piston (2); a sealing oil chamber (10) is provided between the end cap (1) and the outer cylinder (3), and the large piston (2) is located in the sealing oil chamber (10); the piston rod (6) can drive the large piston (2) to move axially; One end of the outer cylinder (3) is connected to the end cap (1), and the other end is connected to the support sleeve (5); the oil regulating system is connected to the sealing oil chamber (10), and the oil regulating system can supply pressure to the sealing oil chamber (10).

2. The single-chamber hydraulic frame stabilizer as described in claim 1, characterized in that, The outer cylinder (3) is in the form of a sleeve, with open ends and one end threaded; a hydraulic nozzle connector is provided on the outer circle of the outer cylinder (3).

3. The single-chamber hydraulic frame stabilizer as described in claim 1, characterized in that, The movable piston (4) is connected to the end of the large piston (2). The movable piston (4) slides with the inner wall of the outer cylinder (3). A sealing ring (9) is also provided between the movable piston (4) and the inner wall of the outer cylinder (3).

4. The single-chamber hydraulic frame stabilizer as described in claim 1, characterized in that, The oil regulating system includes a one-way throttle valve (11), a pressure relief valve (12), a safety valve (13), and a one-way valve (14). One end of the pressure relief valve (12) is connected to the positive terminal of the one-way throttle valve (11), and the other end is connected to the safety valve (13). The negative terminals of the safety valve (13) and the one-way throttle valve (11) are connected to the sealed oil chamber (10). The positive terminal of the one-way valve (14) is connected to the pressurized oil, and the negative terminal is connected to the sealed oil chamber (10).

5. The single-chamber hydraulic frame stabilizer as described in claim 4, characterized in that, When the frame rotates unexpectedly, causing the sealed oil chamber (10) to compress beyond the operating value, the pressure relief valve (12) and the safety valve (13) open simultaneously, and the two paths are connected to return oil, releasing the internal pressure of the oil chamber.

6. The single-chamber hydraulic frame stabilizer as described in claim 1, characterized in that, The outer side of the support sleeve (5) is provided with a flange, which is engaged with the inner wall of the outer cylinder (3).

7. The single-chamber hydraulic frame stabilizer as described in claim 6, characterized in that, The piston rod (6) is coaxially disposed between the floating piston (4) and the support sleeve (5) and can move axially; when the piston rod (6) retracts, it moves synchronously with the floating piston (4); when the piston rod (6) extends, it extends together with the large piston (2).

8. The single-chamber hydraulic frame stabilizer as described in claim 7, characterized in that, The large piston (2) includes a piston head (21), a connecting head, and a stop (23); the piston head (21), the connecting shaft (22), and the stop (23) are coaxially arranged, one end of the connecting shaft (22) is detachably connected to the piston head (21), and the other end is detachably connected to the stop (23), and the stop (23) is connected to the floating piston (4).

9. The single-chamber hydraulic frame stabilizer as described in claim 8, characterized in that, The piston rod (6) and the connecting shaft (22) are both hollow structures, connected to the atmosphere (8).

10. The single-chamber hydraulic frame stabilizer as described in claim 1, characterized in that, The piston rod (6) is provided with an adjustable head (7) at its end. The adjustable head (7) cooperates with the piston rod (6) to perform initial length adjustment.

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