Frame stabilizing buffer of self-contained system

Abstract

The invention belongs to the field of aircraft structure design, and particularly relates to a self-system frame stabilizing buffer which comprises a moving floating plug, a buffer outer cylinder, a movable floating plug, a support and a piston rod. The buffer outer cylinder is in a sleeve form and is open at two ends; an outer cylinder joint and an end cover nut are respectively arranged at two ends of the buffer outer cylinder; the support is arranged between the buffering outer cylinder and the end cover nut, and is clamped and fixed by the end cover nut and the end surface of the outer cylinder; nitrogen is sealed in the high-pressure air cavity and has certain pressure, pressure for stabilizing the buffer is provided through the high-pressure air cavity and acts on the movable floating plug and the piston rod at the same time, the stable buffer is located at the neutral position through the pressure difference, and position control over the frame is achieved. When the piston rod of the stable buffer is passively stretched, oil is discharged from the first oil cavity of the piston rod, then the oil flows to the second oil cavity to form certain damping, and when an airplane skates on the ground and a frame is disturbed, the frame is quickly recovered to be neutral through the damping, so that the function of suppressing vibration of the frame is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of aircraft structure design, and in particular relates to a self-contained vehicle frame stabilizing buffer. Background Art

[0002] The frame stabilizer is an essential functional component for large frame landing gear. In actual use, the frame stabilizer mainly has the ability to maintain the frame attitude, control the attitude and damp the frame pitch according to the use of the landing gear and the frame.

[0003] In actual use, the existing stabilizing buffer requires an external hydraulic source to provide the frame position holding force. When the hydraulic source disappears, once the liquid inside the stabilizing buffer is discharged, it cannot be replenished in time, which easily forms a cavity, making it difficult to maintain the frame posture.

[0004] Therefore, how to stably maintain the frame position retention force is a problem that needs to be solved. Summary of the invention

[0005] The purpose of the present application is to provide a self-contained vehicle frame stabilizing buffer to solve or alleviate at least one problem in the background technology.

[0006] The technical solution of the present application is: a self-contained vehicle frame stabilizing buffer, comprising a floating float, a buffer outer cylinder, a movable float, a support and a piston rod; the buffer outer cylinder is in the form of a sleeve, with both ends open; both ends of the buffer outer cylinder are respectively provided with an outer cylinder joint and an end cover nut; the support is arranged between the buffer outer cylinder and the end cover nut, and the support is clamped and fixed by the end cover nut and the end face of the outer cylinder;

[0007] The floating float is arranged at one end of the buffer outer tube, one end of the floating float is closed and the other end is open, and it is close to the outer tube joint under the action of air pressure and oil pressure; the movable float is arranged at the other end of the buffer outer tube, one end of the movable float is closed and the other end is open; the piston rod is inserted into the buffer outer tube through the open position of the movable float; the movable float can be pressed against the supporting end surface under air pressure, and the piston head of the piston rod can be pressed against the closed end of the movable float under oil pressure;

[0008] The floating float, the buffer outer cylinder and the movable float form a high-pressure air chamber, the buffer outer cylinder, the movable float, the support and the piston rod form a first oil chamber; the outer cylinder joint, the buffer outer cylinder and the floating float form a second oil chamber.

[0009] Preferably, an external pipeline connecting nozzle is fixedly connected to the external pipeline of the buffer outer cylinder, and the external pipeline connecting nozzle is communicated with the first oil chamber.

[0010] Preferably, an external one-way damping valve is connected to the external pipeline of the buffer outer cylinder, and the one-way damping valve is connected to the first oil chamber and the second oil chamber.

[0011] Preferably, an oil circuit is designed in the outer tube joint, and two ends of the oil circuit are respectively connected to the second oil chamber and the external pipeline.

[0012] Preferably, sealing components are provided between the buffer outer cylinder and the outer cylinder joint, between the movable float and the buffer outer cylinder, and between the support and the end cover nut.

[0013] Preferably, a flange is provided on the support end face, and a sealing assembly and a sealing dust ring are respectively installed on the outer circle and inner circle of the middle diameter section of the support, and the support and the sealing dust ring are inserted into the inner circle of the buffer outer cylinder, and the flange is clamped by the end cover nut and the buffer outer cylinder respectively.

[0014] Preferably, the air pressure action area of ​​the floating float is the same as the oil pressure action area.

[0015] Preferably, the air pressure action area of ​​the movable float is larger than the oil action area, the outer circle of the movable float is provided with a support surface, and the movable float is sealed with the inner circle of the buffer outer cylinder through the support surface.

[0016] Preferably, the open end of the movable float is designed with a stop nut, and the stop nut is designed with a flanged stop surface; when the piston rod is away from the closed end of the movable float, the stop nut stops the piston rod piston head through the flanged stop surface.

[0017] Preferably, the piston rod comprises a rod section and a piston head, and the rod section of the piston rod extends out of the end cover nut.

[0018] Preferably, an adjustable joint is provided on the outside of the rod section of the piston rod, and the adjustable joint and the rod section of the piston rod are locked by a fixing nut.

[0019] Preferably, the outer tube joint and the end cover nut are threadably matched with both ends of the buffer outer tube.

[0020] The self-contained frame stabilizing buffer of the present application has nitrogen sealed in the high-pressure air chamber and has a certain pressure. The pressure of the stabilizing buffer is provided by the high-pressure air chamber and acts on the movable float and the piston rod at the same time. The pressure difference makes the stabilizing buffer in a neutral position, realizing the position control of the frame. When the piston rod of the stabilizing buffer is passively stretched, the first oil chamber of the piston rod discharges oil, and then the oil flows to the second oil chamber, forming a certain damping. When the aircraft is taxiing on the ground, when the frame is disturbed, it quickly returns to neutral through damping, which plays the function of suppressing the vibration of the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

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

[0023] 1. Outer tube joint; 2. Sealing assembly; 3. Floating float; 4. Buffer outer tube; 5. Movable float; 6. Stop nut; 7. Support; 8. Piston rod; 9. Fixed nut; 10. Adjustable joint; 11. End cover nut; 12. Sealing dust ring; 13. First oil chamber; 14. One-way damping valve; 15. High-pressure air chamber; 16. Second oil chamber. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] A self-contained frame stabilizing buffer, such as Figure 1 As shown, it includes a floating float 3, a buffer outer tube 4, a movable float 5, a support 7 and a piston rod 8. The buffer outer tube 4 is in the form of a sleeve, with both ends open; the two ends of the buffer outer tube 4 are respectively provided with an outer tube joint 1 and an end cover nut 11; the support 7 is arranged between the buffer outer tube 4 and the end cover nut 11, and is clamped and fixed by the end cover nut 11 and the end face of the outer tube.

[0026] The floating plug 3 is arranged at one end of the buffer outer tube 4, one end of the floating plug 3 is closed and the other end is open, and it is close to the outer tube joint 1 under the action of air pressure and oil pressure; the movable floating plug 5 is arranged at the other end of the buffer outer tube 4, one end of the movable floating plug 5 is closed and the other end is open; the piston rod 8 is inserted into the buffer outer tube 4 through the open position of the movable floating plug 5. The movable floating plug 5 can be pressed against the end surface of the support 7 under air pressure, and the piston head of the piston rod 8 can be pressed against the closed end of the movable floating plug 5 under oil pressure.

[0027] The floating float 3, the buffer outer tube 4 and the movable float 5 form a high-pressure air chamber 15, the buffer outer tube 4, the movable float 5, the support 7, and the piston rod 8 form a first oil chamber 13; the outer tube joint 1, the buffer outer tube 4 and the floating float 3 form a second oil chamber 16.

[0028] The high-pressure air chamber 15 is sealed with nitrogen and has a certain pressure. The pressure of the stabilizing buffer is provided through the high-pressure air chamber 15 and acts on the movable float 5 and the piston rod 8 at the same time. The pressure difference makes the stabilizing buffer in a neutral position, thereby realizing the position control of the frame.

[0029] When the piston rod 8 of the stabilizing buffer is passively stretched, the first oil chamber 13 of the piston rod 8 is discharged, and then the oil flows to the second oil chamber 16, forming a certain damping. When the aircraft is taxiing on the ground, when the frame is disturbed, it quickly returns to neutral through damping, which plays a role in suppressing the vibration of the frame.

[0030] In some optional embodiments, an external pipeline connecting nozzle is fixedly connected to the external pipeline of the buffer outer tube 4, and the external pipeline connecting nozzle is connected to the first oil chamber 13, so that the pressure of the first oil chamber 13 and the second oil chamber 16 are the same.

[0031] In some optional embodiments, an external one-way damping valve 14 is connected to the external pipeline of the buffer outer tube 4, and the one-way damping valve 14 connects the first oil chamber 13 and the second oil chamber 16 to achieve oil damping to reduce frame vibration.

[0032] In some optional embodiments, an oil circuit is designed inside the outer tube joint 1, and the two ends of the oil circuit are respectively connected to the second oil chamber 16 and the external pipeline, so that the second oil chamber 16 can form the same pressure as the oil in the external pipeline, so that the two ends of the first oil chamber 13 are subjected to the same pressure and remain neutral.

[0033] In some optional embodiments, a sealing assembly 2 is provided between the buffer outer cylinder 4 and the outer cylinder joint 1, the movable float 5 and the buffer outer cylinder 4, and the support 7 and the end cover nut 11 to ensure the sealing of the first oil chamber 13 and the second oil chamber 16. The sealing assembly 2 can be a sealing ring, etc.

[0034] In some optional implementation schemes, the air pressure action area of ​​the floating float 3 is the same as the oil action area to ensure that the floating float can move freely in the buffer outer cylinder.

[0035] In some optional implementation schemes, the air pressure action area of ​​the movable float 5 is larger than the oil action area, so that the movable float 5 can be close to the support 7; the outer circle of the movable float 5 is provided with a support surface, and the support surface of the movable float 7 is sealed and matched with the inner circle of the buffer outer tube 4, and is inserted into the buffer outer tube 4.

[0036] In some optional embodiments, the open end of the movable float 5 is designed with a stop nut 6, and a flanged stop surface is designed on the stop nut 6; when the piston rod 8 is away from the closed end of the movable float 5, the stop nut 6 stops the piston head of the piston rod 8 through the flanged stop surface to maintain the neutral trend.

[0037] In some optional embodiments, a flange is provided on the end face of the support 7, and the outer circle and inner circle of the middle diameter section of the support 7 are respectively installed with the sealing assembly 2 and the sealing dust ring 12, and the support 7 and the sealing dust ring are inserted into the inner circle of the buffer outer tube 4, and the flange is clamped by the end cover nut 11 and the buffer outer tube 4 respectively, and the connection is tight.

[0038] In some optional embodiments, the piston rod 8 includes a rod section and a piston head. The rod section of the piston rod 8 extends out of the end cover nut 11. The outer circle of the piston head of the piston rod 8 and the inner circle of the movable float 5 are sealed by the sealing assembly 2 and fit tightly.

[0039] In some optional embodiments, an adjustable joint 10 is provided on the outside of the rod section of the piston rod 8. The adjustable joint 10 and the rod section of the piston rod 8 are locked by a fixing nut 9. The initial neutral position length of the stabilizing buffer is adjusted by rotating the adjustable joint 10.

[0040] In some optional embodiments, the outer tube joint 1 and the end cover nut 11 are threadedly matched with both ends of the buffer outer tube 4 .

[0041] The specific working process is as follows:

[0042] Position holding function of the stable buffer:

[0043] The pressure of the high-pressure air chamber 15 first acts on the floating piston 3, so that the second oil chamber 16 generates the same pressure as the high-pressure air chamber 15. Since the first oil chamber 13 is connected to the second oil chamber 16, the pressure of the first oil chamber 13 and the second oil chamber 16 is the same. The left side of the movable piston 5 is affected by the pressure of the high-pressure air chamber 15, and the right side is affected by the pressure of the second oil chamber 16. At this time, the air pressure acting surface is the outer end surface of the movable piston 5, and the oil pressure acting surface is the annular surface formed by the outer circle of the movable piston 5 and the outer circle of the piston rod 8. The pressure difference makes the movable piston 5 close to the support 7; the hydraulic pressure of the piston rod 8 acts on the annular surface of the outer circle of the piston head and the outer circle of the rod section, and the piston rod 8 is close to the closed end of the movable piston 5. At this time, the stable buffer is neutral.

[0044] When an external load compresses the piston rod 8, the piston rod 8 drives the movable float 5 to move to the left and begins to compress the high-pressure air chamber 15. Since the area of ​​the second oil chamber 16 is much larger than that of the first oil chamber 13, the pressure of the high-pressure air chamber 15 increases, which acts on the movable float 5, so that the stabilizing buffer returns to a neutral position; when an external load stretches the piston rod 8, the first oil chamber 13 decreases and fills the second oil chamber 16 with oil, but the movable float 5 is limited by the support 7, the pressure of the high-pressure air chamber 15 increases, and the pressure of the first oil chamber 13 also increases, acting on the piston rod 8, so that the stabilizing buffer returns to a neutral position, thereby maintaining the position of the frame.

[0045] Damping function of the stabilizing buffer:

[0046] When the frame pitches and vibrates, the piston rod 8 of the stabilizing buffer stretches rapidly, and the oil in the first oil chamber 13 is quickly filled into the second oil chamber 16 through the one-way damping valve 14. The one-way damping valve 14 blocks the passage of the oil, and the pressure in the first oil chamber 13 increases, generating a damping force when the stabilizing buffer stretches, thereby preventing the stabilizing buffer from deviating from the neutral position.

[0047] After a large number of experiments, the results show that the application can maintain and control the position of the frame without an external hydraulic source, and at the same time achieve damping suppression when the piston rod 8 of the frame vibration stabilization buffer is quickly stretched. It has high integration, few external hydraulic accessories, simple structure and low cost.

[0048] Finally, it should be noted that: the drawings of the embodiments disclosed in the present invention only involve structures related to the embodiments disclosed in the present invention, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0049] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-contained vehicle frame stabilizing buffer, characterized in that: The invention comprises a floating plug (3), a buffer outer cylinder (4), a movable floating plug (5), a support (7) and a piston rod (8); the buffer outer cylinder (4) is in the form of a sleeve with two open ends; the two ends of the buffer outer cylinder (4) are respectively provided with an outer cylinder joint (1) and an end cover nut (11); the support (7) is arranged between the buffer outer cylinder (4) and the end cover nut (11), and the support (7) is clamped and fixed by the end cover nut (11) and the end surface of the outer cylinder; The movable float plug (3) is arranged at one end of the buffer outer tube (4), one end of the movable float plug (3) is closed and the other end is open, and it is close to the outer tube joint (1) under the action of air pressure and oil pressure; the movable float plug (5) is arranged at the other end of the buffer outer tube (4), one end of the movable float plug (5) is closed and the other end is open; the piston rod (8) is inserted into the buffer outer tube (4) through the open position of the movable float plug (5); the movable float plug (5) can be pressed against the end surface of the support (7) under air pressure, and the piston head of the piston rod (8) can be pressed against the closed end of the movable float plug (5) under oil pressure; The floating plug (3), the buffer outer cylinder (4) and the movable plug (5) form a high-pressure air chamber (15); the buffer outer cylinder (4), the movable plug (5), the support (7) and the piston rod (8) form a first oil chamber (13); and the outer cylinder joint (1), the buffer outer cylinder (4) and the floating plug (3) form a second oil chamber (16).

2. The self-contained vehicle frame stabilizing buffer according to claim 1, characterized in that: An external pipeline connecting nozzle is fixedly connected to the external pipeline of the buffer outer cylinder (4), and the external pipeline connecting nozzle is connected to the first oil chamber (13).

3. The self-contained vehicle frame stabilizing buffer according to claim 2, characterized in that: An external one-way damping valve (14) is connected to the external pipeline of the buffer outer cylinder (4), and the one-way damping valve (14) is connected to the first oil chamber (13) and the second oil chamber (16).

4. The self-contained vehicle frame stabilizing buffer according to claim 2, characterized in that: An oil circuit is designed inside the outer tube joint (1), and two ends of the oil circuit are respectively connected to the second oil chamber (16) and the external pipeline.

5. The self-contained vehicle frame stabilizing buffer according to claim 2, characterized in that: A sealing assembly (2) is provided between the buffer outer cylinder (4) and the outer cylinder joint (1), the movable float (5) and the buffer outer cylinder (4), and the support (7) and the end cover nut (11).

6. The self-contained vehicle frame stabilizing buffer according to claim 5, characterized in that: The support (7) is provided with a flange on its end face, and the outer circle and inner circle of the middle diameter section of the support (7) are respectively installed with a sealing assembly (2) and a sealing dust ring (12), and the support (7) and the sealing dust ring (12) are inserted into the inner circle of the buffer outer cylinder (4), and the flange is clamped by the end cover nut (11) and the buffer outer cylinder (4).

7. The self-contained vehicle frame stabilizing buffer according to claim 1, characterized in that: The air pressure action area of ​​the movable float (3) is the same as the oil liquid action area.

8. The self-contained vehicle frame stabilizing buffer according to claim 1, characterized in that: The air pressure action area of ​​the movable float (5) is larger than the oil action area, the outer circle of the movable float (5) is provided with a support surface, and the movable float (5) is sealed with the inner circle of the buffer outer cylinder (4) through the support surface.

9. The self-contained vehicle frame stabilizing buffer according to claim 1, characterized in that: The open end of the movable float (5) is provided with a stop nut (6), and the stop nut (6) is provided with a flanged stop surface; when the piston rod (8) moves away from the closed end of the movable float (5), the stop nut (6) stops the piston head of the piston rod (8) through the flanged stop surface.

10. The self-contained vehicle frame stabilizing buffer according to claim 1, characterized in that: The piston rod (8) comprises a rod section and a piston head, and the rod section of the piston rod (8) extends out of the end cover nut (11).

11. The self-contained vehicle frame stabilizing buffer according to claim 1, characterized in that: An adjustable joint (10) is provided on the outside of the rod section of the piston rod (8), and the adjustable joint (10) and the rod section of the piston rod (8) are locked by a fixing nut (9).

12. The self-contained vehicle frame stabilizer according to claim 1, characterized in that: The outer tube joint (1) and the end cover nut (11) are threadedly matched with the two ends of the buffer outer tube (4).

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