Frame stabilizing buffer of frame type undercarriage

Abstract

The frame stabilizing buffer comprises an actuating cylinder, two pressure supply valve sets of the same structure are evenly distributed on the outer portion of the actuating cylinder in the circumferential direction, an inner cavity and an outer cavity are formed in the actuating cylinder, and a piston set is slidably arranged between the two ends of the interior of the inner cavity; the outlet end of the first pressure supply valve group is arranged corresponding to the second side of the piston group, the outlet end of the second pressure supply valve group is connected with the inlet of the outer cavity, and the outlet of the outer cavity is arranged corresponding to the first side of the piston group; a plurality of blocking pieces are arranged between the two ends of the inner cavity and can block the outer cavity under the extrusion effect of the piston set. The pressure supply valve group comprises a one-way valve and a pressure stabilizing valve which are opened from the first side to the second side, and the second side of the one-way valve is connected with the pressure stabilizing valve; the second side of the one-way valve in the first pressure supply valve set is connected with the second side of the one-way valve in the second pressure supply valve set through a guide pipe, and a middle one-way valve is arranged on the guide pipe. The position of the piston rod can be automatically and quickly balanced and locked when the piston rod moves to the preset stroke, and then instability of the frame is avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of linear actuators, and particularly relates to a vehicle frame stabilizing buffer of a vehicle frame landing gear. BACKGROUND

[0002] The vehicle frame stabilizing buffer is an important component of the vehicle frame landing gear, which is mainly composed of an actuating cylinder, a one-way valve, a safety valve and the like. Through the joint action of the one-way valve and the safety valve, the smooth flow of the oil liquid of the system and the oil pressure within the safe range are controlled, and then the output force of the actuating cylinder during the retraction and extension of the actuating cylinder is controlled, so as to realize the retraction and extension function of the vehicle frame. In the design of the vehicle frame landing gear, in addition to the retraction and extension function of the vehicle frame, the vehicle frame stabilizing buffer can also realize a certain degree of vehicle frame stabilization function during the ground sliding of the aircraft. In the existing vehicle frame stabilizing buffer, the piston rod in the actuating cylinder linearly extends and retracts under the action of the oil liquid, and drives the retraction and extension of the vehicle frame. However, the movement stroke of the piston rod is difficult to determine, and it is difficult to fix the piston rod when the piston rod moves to the predetermined stroke. This causes the stability of the vehicle frame to be reduced under the action of external force and vibration.

[0003] Therefore, in view of the defect that the piston rod in the actuating cylinder of the vehicle frame stabilizing buffer is difficult to fix after reaching the predetermined stroke, the present application discloses a vehicle frame stabilizing buffer of a vehicle frame landing gear. SUMMARY

[0004] The present application discloses a vehicle frame stabilizing buffer of a vehicle frame landing gear, which can automatically and quickly balance and lock the position of the piston rod when the piston rod moves to the predetermined stroke, thereby avoiding the instability of the vehicle frame.

[0005] The present application is realized by the following technical scheme: A vehicle frame stabilizing buffer of a vehicle frame landing gear, comprising an actuating cylinder, two groups of structure-same pressure supply valve groups are uniformly arranged on the outside of the actuating cylinder in the circumferential direction, an inner cavity and an outer cavity are arranged in the inside of the actuating cylinder, a piston group is slidably arranged between the two ends of the inner cavity, the outlet of the first group of pressure supply valve groups is arranged corresponding to the second side of the piston group, the outlet of the second group of pressure supply valve groups is connected with the inlet of the outer cavity, and the outlet of the outer cavity is arranged corresponding to the first side of the piston group; a plurality of blocking pieces are arranged between the two ends of the inner cavity, and the blocking pieces can be blocked with the outer cavity under the extrusion action of the piston group; the pressure supply valve group comprises a one-way valve and a pressure stabilizing valve which are opened from the first side to the second side, and the second side of the one-way valve is connected with the pressure stabilizing valve; the second side of the one-way valve in the first group of pressure supply valve groups is connected with the second side of the one-way valve in the second group of pressure supply valve groups through a conduit, and an intermediate one-way valve is arranged on the conduit.

[0006] One end of the piston group is connected with the frame, and one end of the actuating cylinder is connected with the landing gear support. The first side and the second side of the piston group are respectively supplied with oil through the two groups of pressure supply valves, so as to drive the piston rod to linearly extend and retract along the inner cavity, and then drive the frame to be retracted and extended. When the piston group moves to the predetermined stroke and contacts the blocking member, the blocking member is extruded by the piston group to block the outer cavity, at this time, the first side of the piston group is no longer supplied with oil, and the intermediate one-way valve on the conduit is opened under the action of oil pressure, so that the oil supplied by the second pressure supply valve group flows to the second side of the one-way valve in the first pressure supply valve group through the conduit, so that the one-way valve in the first pressure supply valve group is closed, at this time, the second side of the piston group is also no longer supplied with oil, so that the piston group maintains a balanced locking state, that is, a state of fixing the frame.

[0007] In order to better realize the present application, further, the blocking member comprises a pressure wedge, a reset spring, the pressure wedge is arranged between the inner cavity and the outer cavity in a radial sliding manner, one end of the pressure wedge extends to the inside of the inner cavity and is provided with a pressure inclined surface, the other end of the pressure wedge extends to the inside of the outer cavity and is provided with a plug; the pressure wedge and the cavity wall of the inner cavity are provided with a reset spring.

[0008] In order to better realize the present application, further, the second side of the piston group is provided with a control piston coaxially connected with the piston group, the control piston is in sliding fit connection with the inner cavity; the first side and the second side of the control piston are respectively connected with the control valve group.

[0009] In order to better realize the present application, further, the inside of the actuating cylinder is coaxially provided with a center rod, the piston group is slidingly arranged outside the center rod, and the control piston is slidingly arranged at one end of the center rod.

[0010] In order to better realize the present application, further, the piston group comprises a limiting cap and a piston rod, the piston rod is slidingly arranged inside the inner cavity, and one end of the piston rod is provided with the limiting cap, the limiting cap is in sliding fit connection with the center rod.

[0011] In order to better realize the present application, further, the one-way valve comprises a one-way valve spring, a one-way valve core and a one-way valve shell, the one-way valve core is slidingly arranged between the inlet and the outlet inside the one-way valve shell, the second side of the one-way valve core is provided with the one-way valve spring, and the outlet of the one-way valve shell is connected with the pressure stabilizing valve.

[0012] In order to better realize the present application, further, the pressure stabilizing valve comprises a pressure stabilizing valve spring, a pressure stabilizing valve core and a pressure stabilizing valve shell, the pressure stabilizing valve core is slidingly arranged between the inlet and the outlet inside the pressure stabilizing valve shell, and the first side of the pressure stabilizing valve core is provided with the pressure stabilizing valve spring.

[0013] In order to better realize the present application, further, one end of the actuating cylinder is provided with an end cover for sealing the inner cavity, and one end of the piston group extends to the outside of the inner cavity and is provided with a tail connecting rod.

[0014] In order to better realize the present application, further, mounting holes are arranged on the end cover and the tail connecting rod, and a centripetal joint bearing is arranged in the mounting holes.

[0015] Compared with the prior art, the present application has the following advantages and beneficial effects: The present application realizes the rapid folding and unfolding operation of the vehicle frame by arranging two groups of pressure supply valve groups to supply oil to the two sides of the piston group, driving the piston group to linearly extend and retract by controlling the oil pressure on the two sides of the piston group, arranging a blocking member between the inner cavity and the outer cavity, and extruding the blocking member when the piston group moves to the predetermined stroke, so that the blocking member blocks the outer cavity and the first side of the piston group is no longer supplied with oil, and the oil path between the two groups of pressure supply valve groups is connected by the conduit, so that the one-way valve in the other group of pressure supply valve groups is closed, and the second side of the piston group is no longer supplied with oil, thereby ensuring that the piston group can be balanced and fixed at the predetermined stroke, and further ensuring that the vehicle frame can be balanced and stable at the predetermined position. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an internal structure diagram of the vehicle frame stabilizer buffer; Figure 2 It is an external structure diagram of the vehicle frame stabilizer buffer; Figure 3 It is a structure diagram of the pressure stabilizing valve; Figure 4 It is a structure diagram of the one-way valve; Figure 5 It is Figure 1 It is a local enlarged view of B.

[0017] Wherein: 1 - actuating cylinder; 2 - pressure supply valve group; 3 - piston group; 4 - conduit; 5 - intermediate one-way valve; 6 - control piston; 7 - control valve group; 8 - center rod; 9 - end cover; 10 - tail connecting rod; 11 - centripetal joint bearing; 100 - inner cavity; 200 - outer cavity; 300 - blocking member; 301 - pressure receiving wedge; 302 - return spring; 21 - one-way valve; 22 - pressure stabilizing valve; 31 - limit cap; 32 - piston rod; 211 - one-way valve spring; 212 - one-way valve core; 221 - pressure stabilizing valve spring; 222 - pressure stabilizing valve core. DETAILED DESCRIPTION

[0018] Example 1: The vehicle frame stabilizer buffer of the vehicle frame landing gear of the present embodiment is as shown in Figure 1 , Figure 2As shown, the device includes an actuating cylinder 1. Two sets of identical pressure supply valve assemblies 2 are evenly distributed circumferentially around the outside of the actuating cylinder 1. The actuating cylinder 1 has an inner cavity 100 and an outer cavity 200. A piston assembly 3 is slidably disposed between the two ends of the inner cavity 100. The outlet of the first set of pressure supply valve assemblies 2 corresponds to the second side of the piston assembly 3, and the outlet of the second set of pressure supply valve assemblies 2 is connected to the inlet of the outer cavity 200. The outlet of the outer cavity 200 corresponds to the first side of the piston assembly 3. The inner cavity 100... Several blocking elements 300 are provided between the two ends of 00. The blocking elements 300 can block the outer cavity 200 under the squeezing action of the piston group 3. The pressure supply valve group 2 includes a one-way valve 21 that opens from the first side to the second side and a pressure regulating valve 22. The second side of the one-way valve 21 is connected to the pressure regulating valve 22. The second side of the one-way valve 21 in the first group of pressure supply valve groups 2 and the second side of the one-way valve 21 in the second group of pressure supply valve groups 2 are connected by a conduit 4. An intermediate one-way valve 5 is provided on the conduit 4.

[0019] One end of piston assembly 3 is connected to the vehicle frame, and one end of actuator cylinder 1 is connected to the landing gear support. A check valve 21 has an inlet on its first side connected to the oil supply equipment, and its outlet is connected to the inlet of pressure regulating valve 22. The outlet of pressure regulating valve 22 in the first pressure supply valve group 2 corresponds to the second side of piston assembly 3, and the outlet of pressure regulating valve 22 in the second pressure supply valve group 2 is connected to the inlet of outer cavity 200. The outlet of outer cavity 200 corresponds to the first side of piston assembly 3. Oil is supplied to both sides of piston assembly 3 through the two pressure supply valve groups 2. When the oil pressure on the first side of piston assembly 3 is greater than the oil pressure on the second side, piston assembly 3 extends; conversely, when the oil pressure on the first side of piston assembly 3 is less than the oil pressure on the second side, piston assembly 3 retracts. When piston assembly 3 slides to a predetermined stroke position inside inner cavity 100, it presses against blocking member 300. At this time, blocking member 300 extends radially into outer cavity 200 and blocks outer cavity 200. At this point, the first side of piston assembly 3 is no longer receiving oil. Because the outer cavity 200 is blocked, it is equivalent to the pressure regulating valve 22 in the second pressure supply valve assembly 2 being blocked. At this time, the intermediate check valve 5 on the guide pipe 4 opens under oil pressure, allowing the oil in the second pressure supply valve assembly 2 to flow through the guide pipe 4 to the second side of the check valve 21 in the first pressure supply valve assembly 2. At this point, the oil pressure on the second side of the check valve 21 in the first pressure supply valve assembly 2 is greater than the oil pressure on the first side, causing the check valve 21 in the first pressure supply valve assembly 2 to close, thus preventing the second side of piston assembly 3 from receiving oil either. Ultimately, this allows piston assembly 3 to maintain balance at the predetermined stroke, thereby maintaining the extended state of the frame.

[0020] Furthermore, one end of the actuating cylinder 1 is provided with an end cap 9 that seals the inner cavity 100, and one end of the piston assembly 3 extends to the outside of the inner cavity 100 and is provided with a tail rod 10. Both the end cap 9 and the tail rod 10 are provided with mounting holes, and a radial spherical bearing 11 is installed inside the mounting holes.

[0021] Example 2: This embodiment discloses a frame stabilizing damper for a frame-type landing gear, which is an improvement on Embodiment 1, such as... Figure 1 and Figure 5 As shown, the blocking member 300 includes a pressure wedge 301 and a return spring 302. The pressure wedge 301 is slidably disposed radially between the inner cavity 100 and the outer cavity 200. One end of the pressure wedge 301 extends into the interior of the inner cavity 100 and is provided with a pressure inclined surface. The other end of the pressure wedge 301 extends into the interior of the outer cavity 200 and is provided with a plug. A return spring 302 is provided between the pressure wedge 301 and the cavity wall of the inner cavity 100.

[0022] The piston assembly 3 is provided with a compression slope that cooperates with the compression slope. When the piston assembly 3 slides to the predetermined stroke position, the compression slope compresses the compression slope, which causes the compression wedge 301 to move radially toward the outer cavity 200 until the compression wedge 301 blocks the outer cavity 200. At this time, the return spring 302 is in a compressed state.

[0023] The rest of this embodiment is the same as that of Embodiment 1, so it will not be described again.

[0024] Example 3: This embodiment discloses a frame stabilizing damper for a frame-type landing gear, which is optimized based on embodiment 1 or 2, such as... Figure 1 As shown, a control piston 6 is coaxially connected to the piston assembly 3 on the second side, and the control piston 6 is slidably connected to the inner cavity 100. The first and second sides of the control piston 6 are respectively connected to the control valve assembly 7. When the piston assembly 3 is at the predetermined stroke position, neither side of the piston assembly 3 receives oil, keeping the piston assembly 3 stationary and ensuring that the piston assembly 3 can continuously press against the blocking member 300. In order to move the piston assembly 3 to the position of the next blocking member 300, that is, to the next predetermined stroke position, oil is supplied to both sides of the control piston 6 through the control valve assembly 7. The pressure difference between the two sides drives the control piston 6 to push the piston assembly 3 in the inner cavity 100, thereby causing the piston assembly 3 to pass the current equilibrium position. This causes the return spring 302 in the blocking member 300 to cause the pressure wedge 301 to rebound and no longer block the outer cavity 200. Then, the two sets of pressure supply valve assemblies 2 can be used to re-supply oil to both sides of the piston assembly 3 to move the piston assembly 3 to the position of the next blocking member 300.

[0025] The rest of this embodiment is the same as that of embodiment 1 or 2, so it will not be described again.

[0026] Example 4: This embodiment discloses a frame stabilizing damper for a frame-type landing gear, which is an improvement on any one of embodiments 1-3, such as... Figure 1 As shown, a central rod 8 is coaxially arranged inside the actuating cylinder 1, the piston assembly 3 is slidably disposed outside the central rod 8, and the control piston 6 is slidably disposed at one end of the central rod 8. The central rod 8 guides the sliding of the piston assembly 3, ensuring that the piston assembly 3 moves along the axial direction of the actuating cylinder 1.

[0027] Furthermore, such as Figure 1 As shown, the piston assembly 3 includes a limiting cover 31 and a piston rod 32. The piston rod 32 is slidably disposed inside the inner cavity 100. A limiting cover 31 is provided at one end of the piston rod 32, and the limiting cover 31 is slidably connected to the center rod 8. The limiting cover 31 is threadedly installed at one end of the piston rod 32. Oil from the two sets of pressure supply valve assemblies 2 acts on both sides of the limiting cover 31, thereby driving the piston rod 32 to move.

[0028] The rest of this embodiment is the same as any one of embodiments 1-3, so it will not be described again.

[0029] Example 5: This embodiment discloses a frame stabilizing damper for a frame-type landing gear, which is an improvement on any one of embodiments 1-4, such as... Figure 4 As shown, the one-way valve 21 includes a one-way valve spring 211, a one-way valve core 212, and a one-way valve housing. The one-way valve core 212 is slidably disposed inside the one-way valve housing between the inlet and the outlet. The one-way valve spring 211 is disposed on the second side of the one-way valve core 212. The outlet of the one-way valve housing is connected to the pressure regulating valve 22.

[0030] When the oil pressure on the first side is greater than the oil pressure on the second side, the one-way valve core 212 compresses the one-way valve spring 211, causing the one-way valve core 212 to open. When the oil pressure on the first side is less than the oil pressure on the second side, the one-way valve core 212 moves in the opposite direction to close.

[0031] Furthermore, such as Figure 3 As shown, the pressure regulating valve 22 includes a pressure regulating valve spring 221, a pressure regulating valve core 222, and a pressure regulating valve housing. The pressure regulating valve core 222 is slidably disposed inside the pressure regulating valve housing between the inlet and outlet. The pressure regulating valve spring 221 is disposed on the first side of the pressure regulating valve core 222. The spring force of the pressure regulating valve spring 221 ensures that the pressure regulating valve core 222 can open stably, thereby ensuring a smooth oil supply to both sides of the piston assembly 3 and avoiding large fluctuations in oil pressure.

[0032] The rest of this embodiment is the same as any one of embodiments 1-4, so it will not be described again.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A bogie stabilizer damper for a bogie of a landing gear, comprising an actuator cylinder (1), characterized in that The outer part of the actuator cylinder (1) is provided with two groups of pressure supply valves (2) which are arranged uniformly in the circumferential direction and have the same structure, the inner part of the actuator cylinder (1) is provided with an inner cavity (100) and an outer cavity (200), the inner part of the inner cavity (100) is slidably provided with a piston group (3) between two ends, the outlet end of the first group of pressure supply valves (2) is arranged corresponding to the second side of the piston group (3), the outlet end of the second group of pressure supply valves (2) is connected with the inlet of the outer cavity (200), and the outlet of the outer cavity (200) is arranged corresponding to the first side of the piston group (3); a plurality of blocking members (300) are arranged between the two ends of the inner cavity (100), and the blocking members (300) can be blocked under the extrusion of the piston group (3). The pressure supply valve group (2) comprises a one-way valve (21) and a pressure stabilizing valve (22), the one-way valve (21) is opened from the first side to the second side, the second side of the one-way valve (21) is connected with the pressure stabilizing valve (22), the second side of the one-way valve (21) in the first group of pressure supply valves (2) is connected with the second side of the one-way valve (21) in the second group of pressure supply valves (2) through a conduit (4), and an intermediate one-way valve (5) is arranged on the conduit (4).

2. A bogie stabiliser shock absorber for a bogie landing gear as claimed in claim 1, characterised in that, The blocking member (300) comprises a pressure receiving wedge (301) and a reset spring (302), the pressure receiving wedge (301) is slidably arranged between the inner cavity (100) and the outer cavity (200) in the radial direction, one end of the pressure receiving wedge (301) extends to the inside of the inner cavity (100) and is provided with a pressure receiving inclined surface, and the other end of the pressure receiving wedge (301) extends to the inside of the outer cavity (200) and is provided with a plug; the pressure receiving wedge (301) and the cavity wall of the inner cavity (100) are provided with the reset spring (302).

3. A bogie stabiliser shock absorber for a bogie landing gear as claimed in claim 2, characterised in that, The second side of the piston group (3) is provided with a control piston (6) which is coaxially connected with the piston group (3), and the control piston (6) is slidably connected with the inner cavity (100); the first side and the second side of the control piston (6) are respectively connected with a control valve group (7).

4. A bogie stabiliser shock absorber for a bogie landing gear as claimed in claim 3, characterised in that, The inner part of the actuator cylinder (1) is coaxially provided with a center rod (8), the piston group (3) is slidably arranged on the outer part of the center rod (8), and the control piston (6) is slidably arranged on one end of the center rod (8).

5. A bogie stabiliser shock absorber for a bogie landing gear as claimed in claim 4, characterised in that, The piston group (3) comprises a limiting cover (31) and a piston rod (32), the piston rod (32) is slidably arranged in the inner part of the inner cavity (100), one end of the piston rod (32) is provided with the limiting cover (31), and the limiting cover (31) is slidably connected with the center rod (8).

6. A bogie stabiliser shock absorber for a bogie landing gear according to any one of claims 1 to 5, characterised in that, The one-way valve (21) comprises a one-way valve spring (211), a one-way valve core (212) and a one-way valve shell, the one-way valve core (212) is slidably arranged in the inner part of the one-way valve shell between the inlet and the outlet, the second side of the one-way valve core (212) is provided with the one-way valve spring (211), and the outlet of the one-way valve shell is connected with the pressure stabilizing valve (22).

7. A bogie stabiliser shock absorber for a bogie landing gear as claimed in claim 6, characterised in that, The constant pressure valve (22) comprises a constant pressure valve spring (221), a constant pressure valve core (222) and a constant pressure valve shell, the inside of the constant pressure valve shell is slidably provided with the constant pressure valve core (222) between the inlet and the outlet, and the first side of the constant pressure valve core (222) is provided with the constant pressure valve spring (221).

8. A bogie stabiliser shock absorber for a bogie landing gear according to any one of claims 1 to 5, characterised in that, One end of the actuating cylinder (1) is provided with an end cover (9) for closing the inner cavity (100), and one end of the piston group (3) extends to the outside of the inner cavity (100) and is provided with a tail connecting rod (10).

9. A vehicle frame stabiliser shock absorber for a vehicle frame landing gear according to claim 8, characterised in that, The end cover (9) and the tail connecting rod (10) are both provided with mounting holes, and a centripetal knuckle bearing (11) is mounted in the mounting holes.

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