Unloading valve and frame stabilizing buffer actuator

Abstract

The application discloses an unloading valve and a frame stabilizing buffering actuating device, and the unloading valve comprises a shell, a first spring, a needle rod, a valve core, a valve sleeve, a second spring and a mounting seat; the shell is sealed through a screw plug, an oil inlet and an oil return port are arranged on the shell; a first cavity is arranged at one end of the valve core, and the other end is in clearance fit with an inner hole of the valve sleeve; an oil inlet hole and an oil outlet hole are arranged on the valve core, and the oil inlet hole and the oil outlet hole are in communication with the first cavity; one end of the needle rod is arranged in the first cavity and is provided with a first gap between the needle rod and the screw plug, and the other end of the needle rod penetrates through the valve core and is in abutment with the inner hole of the valve sleeve; one end of the mounting seat is fixedly connected with the shell, and the other end of the mounting seat is arranged opposite to the valve sleeve and is provided with a second gap, and the second spring is sleeved on the mounting seat and the valve sleeve. The unloading valve and the frame stabilizing buffering actuating device disclosed by the application have the characteristics that when the movement speed of a piston rod of the frame stabilizing buffering actuating device is sharply increased, the unloading valve rapidly reduces the peak load in the device to a proper range, and the dynamic performance is good.

Description

Technical Field

[0001] This invention belongs to the field of lifting device technology, specifically relating to an unloading valve and a frame stabilizing buffer actuation device. Background Technology

[0002] like Figure 1 and Figure 2 As shown, when an aircraft encounters a sudden change in load due to hills or potholes on the ground while taxiing or landing, the chassis tilts forward or backward. The ground load is transmitted through the landing gear linkage to the chassis stabilization and buffer actuator, causing a dramatic increase in the piston rod speed, with instantaneous speeds reaching 1-1.5 m / s. Simultaneously, because the chassis stabilization and buffer actuator is a typical large-capacity hydraulic cylinder, the instantaneous internal pressure reaches 48 MPa and the flow rate reaches 200 L / min. To reduce the peak load acting on the chassis stabilization and buffer actuator and ensure the safe and stable operation of the system, an unloading valve is often installed. Therefore, the unloading valve installed on the chassis stabilization and buffer actuator must meet the functional performance requirements of high-pressure, high-flow unloading and rapid dynamic response. Currently, common unloading valves, such as direct-acting unloading valves, are not suitable for use in high-pressure and high-flow-rate applications due to their structure and stress. Differential unloading valves and pilot-operated unloading valves cannot meet their specific operating conditions due to their complex structure or insufficient dynamic response performance. Summary of the Invention

[0003] To address the aforementioned problems, this invention aims to provide an unloading valve and a frame stabilization and buffering actuation device. The unloading valve has a compact structure and can be easily integrated into the frame stabilization and buffering actuation device. When the piston rod of the frame stabilization and buffering actuation device experiences a sharp increase in movement speed, resulting in high pressure and high flow rate inside, the unloading valve can quickly reduce the peak load inside the stabilization and buffering actuation device to an appropriate range, exhibiting good dynamic performance.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A relief valve, characterized by the following structure: It includes a housing and a first spring, a needle rod, a valve core, a valve sleeve, a second spring, and a mounting base disposed within the housing. The sidewall of the valve core is engaged with the inner wall of the housing. The end of the housing is sealed by a screw plug, and the sidewall of the housing has an oil inlet and an oil return port. One end of the valve core has a first cavity extending inward along its length, and the other end is clearance-fitted with the inner hole of the valve sleeve; the first cavity is sealed by a screw plug. The sidewall of the valve core has an oil inlet hole and an oil outlet hole, both of which communicate with the first cavity. The oil inlet hole communicates with the oil outlet port, and the oil outlet hole is covered by the inner hole of the valve sleeve or communicates with the oil return port. One end of the needle rod is disposed within the first cavity and has a first gap with the screw plug; the other end penetrates the valve core and abuts against the inner hole of the valve sleeve. One end of the mounting base is fixedly connected to the housing, and the other end is disposed opposite to the valve sleeve and has a second gap. The second spring is sleeved on the mounting base and the valve sleeve.

[0006] The needle rod can move axially along the inner wall of the valve core, thereby pushing the valve sleeve to move. In the initial installation position, the inner wall of the valve sleeve covers the oil outlet on the valve core, and both the first and second springs are in a pre-compressed state. When a large amount of high-speed oil enters the unloading valve through the inlet, part of the high-speed oil quickly fills the space between the housing and the valve core, while most of the high-speed oil enters the first chamber through the inlet on the valve core, establishing high pressure. The resulting high pressure acts on the left end face of the needle rod. The pressure pushes the needle rod to the right. When the force of the needle rod reaches the elastic force of the second spring, the needle rod pushes the valve sleeve to compress the second spring. When the valve sleeve moves to contact the mounting seat, the covered oil outlet on the valve core is quickly opened, and the high-speed oil quickly leaks out through the oil outlet and return port. After the pressure is released, the valve sleeve and needle rod are pushed to the initial installation position by the action of the first and second springs. At this time, the valve sleeve covers the oil outlet of the valve core, and the unloading valve closes, completing the unloading function. The unloading valve according to the present invention has a compact structure, can quickly reduce the high-pressure, high-flow-rate oil load to an appropriate range, and has good dynamic performance.

[0007] Preferably, the valve core is provided with multiple radially penetrating oil inlets along the circumferential direction, and all multiple oil inlets are connected to the first cavity.

[0008] Preferably, the valve core is provided with multiple radially penetrating oil outlet holes along the circumferential direction, and all multiple oil outlet holes are connected to the first cavity.

[0009] Preferably, the sum of the cross-sectional areas of the multiple oil inlets is less than or equal to the sum of the cross-sectional areas of the multiple oil outlets.

[0010] Preferably, the plug and the housing are connected by a reinforced thread and sealed by a second seal, with the inner end of the plug abutting against the needle rod. The second seal ensures a tight seal between the plug and the housing.

[0011] Preferably, a first sealing element is provided at the connection between the needle rod and the valve core, and this first sealing element is disposed within the first cavity. The sealing performance of the first cavity is ensured by providing the first sealing element.

[0012] Preferably, the axes of the needle rod, valve sleeve, and mounting base are collinear.

[0013] Preferably, the mounting base is provided with multiple gaskets, and a partition is provided on the outer side of each gasket, with the second spring abutting against the partition. By adjusting the compression of the second spring and the thickness of the mounting base gaskets, when the unloading valve is in its initial installation position, the valve sleeve is fitted onto the valve core, and the inner wall of the valve sleeve covers the oil outlet hole on the valve core, thereby forming a sealed cavity between the valve sleeve and the housing, which is the oil return cavity.

[0014] Based on the same inventive concept, this invention also provides a chassis stabilization and buffering actuation device, including a high-pressure chamber, a return oil chamber, and an unloading valve as described above. The high-pressure chamber is connected to the oil inlet through an oil inlet channel, and the return oil chamber is connected to the return oil outlet through a return oil channel. When an aircraft encounters a runway step or hill while taxiing on the ground, the chassis stabilization and buffering actuation device experiences a dramatic increase in speed, causing the generation of high-pressure, high-flow-rate oil inside. A large amount of high-speed oil enters the unloading valve through the oil inlet channel. After being unloaded by the unloading valve, the pressure of the high-speed oil decreases to an appropriate range and flows back to the return oil chamber through the return oil outlet and return oil channel. This avoids a dramatic increase in the speed of the chassis stabilization and buffering actuation device, reduces the peak load when the aircraft crosses runway steps or hills, and ensures the safe and stable operation of the landing gear. The frame stabilization and buffering actuator of the present invention can be easily integrated with an unloading valve. When the piston rod of the frame stabilization and buffering actuator moves at a drastic speed, causing it to be subjected to high pressure and high flow, the unloading valve can quickly reduce the peak load inside the stabilization and buffering actuator to an appropriate range, thus exhibiting good dynamic performance.

[0015] Preferably, the cross-sectional area of ​​the return oil channel is larger than the cross-sectional area of ​​the inlet oil channel.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the unloading valve and the frame stabilizing buffer actuation device of the present invention have a compact unloading valve structure, which can be easily integrated into the frame stabilizing buffer actuation device. When the piston rod of the frame stabilizing buffer actuation device moves at a drastic speed, causing it to bear high pressure and large flow, the unloading valve can quickly reduce the peak load inside the stabilizing buffer actuation device to an appropriate range, and has the characteristics of good dynamic performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the rearward tilt of an aircraft frame in the prior art;

[0018] Figure 2This is a schematic diagram of the forward tilting of an aircraft frame in the prior art;

[0019] Figure 3 This is a schematic diagram of the unloading valve structure of the present invention;

[0020] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at the oil inlet;

[0021] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure of the oil outlet (BB);

[0022] Figure 6 for Figure 3 Schematic diagram of the unloading valve's discharge operation;

[0023] Figure 7 This is a schematic diagram of the frame stabilization and buffering actuation device of the present invention.

[0024] In the diagram:

[0025] 1-Plug, 2-Housing, 3-First Spring, 4-First Seal, 5-Needle Rod, 6-Valve Core, 61-Oil Inlet, 62-Oil Outlet, 63-First Cavity, 7-Valve Sleeve, 8-Second Spring, 9-Mounting Seat, 10-Second Seal, 11-Oil Inlet, 12-Oil Return Port, 13-First Gap, 14-Second Gap, 15-Gasket, 16-High Pressure Chamber, 17-Oil Return Chamber, 18-Oil Inlet Channel, 19-Oil Return Channel, 20-Frame, 21-Unloading Valve Oil Return Chamber. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0027] This invention discloses an unloading valve and a frame stabilizing buffer actuation device. The unloading valve is used to reduce the peak load acting on the frame stabilizing buffer actuation device to ensure the safe and stable operation of the system. Figure 3 As shown, the unloading valve includes a screw plug 1, a housing 2, a first spring 3, a needle rod 5, a valve core 6, a valve sleeve 7, a second spring 8, and a mounting base 9. The screw plug 1 and the housing 2 are connected together by reinforcing threads and sealed by a second seal 10, forming the outer body of the unloading valve. The second seal 10 ensures the sealing performance of the connection between the two. Figure 7As shown, the housing 2 is provided with an oil inlet 11 and an oil return port 12. The oil inlet 11 is connected to the high-pressure chamber 16 of the frame stabilizing and buffering actuation device through an oil inlet channel 18, and the oil return port 12 is connected to the oil return chamber 17 of the frame stabilizing and buffering actuation device through an oil return channel 19. Figure 3 As shown, the first spring 3, needle rod 5, valve core 6, valve sleeve 7, second spring 8, and mounting base 9 are installed inside the cavity of housing 2. The side wall of the valve core 6 is engaged with the inner wall of housing 2. The valve core 6 is fixedly installed in the inner hole of housing 2 by applying a tightening torque to the screw plug 1. Figure 3 , Figure 4 and Figure 5 As shown, the valve core 6 has six radially penetrating oil inlet holes 61 and twelve radially penetrating oil outlet holes 62 evenly arranged along its circumference. The sum of the cross-sectional areas of the six oil inlet holes 61 is less than the sum of the cross-sectional areas of the twelve oil outlet holes 62. The oil inlet holes 61 are located to the left of the oil outlet holes 62 and are connected to the oil inlet port 11. One end of the valve core 6 has a first cavity 63 extending inward along its length, and the other end is clearance-fitted with the inner hole of the valve sleeve 7. Both the oil inlet holes 61 and the oil outlet holes 62 are connected to the first cavity 63, which is sealed by a screw plug 1. One end of the needle rod 5 is located inside the first cavity 63 and has a first gap 13 between it and the screw plug 1, while the other end penetrates the valve core 6 and abuts against the inner hole of the valve sleeve 7. A first sealing element 4 is provided at the connection between the needle rod 5 and the valve core 6. This first sealing element 4 is located inside the first cavity 63, making the first cavity 63 a sealed cavity. The needle rod 5 and the valve core 6 are in clearance fit, and the needle rod 5 can reciprocate along the cavity of the valve core 6 under hydraulic action. One end of the mounting base 9 is fixedly connected to the housing 2, and the other end is opposite to the valve sleeve 7 and is provided with a second gap 14. The second spring 8 is sleeved on the mounting base 9 and the valve sleeve 7. By adjusting the compression of the second spring 8 and the thickness of the shim 15 on the mounting base 9, the valve sleeve 7 is sleeved on the valve core 6. In the initial installation position of the unloading valve, the inner wall of the valve sleeve 7 covers the oil discharge hole 61 on the circumference of the valve core 6, so that a sealed cavity is formed between the valve sleeve 7 and the housing 2. This sealed cavity is the unloading valve return oil cavity 21. The unloading valve return oil cavity 21 is connected to the return oil cavity 17 of the frame stabilizing buffer actuation device through the return oil port 12 and the return oil channel 19.

[0028] like Figure 6 and Figure 7As shown in the figure, the arrow indicates the direction of oil movement. When the frame stabilizing buffer actuation device is subjected to tensile load, the piston rod moves violently, causing it to generate high pressure and high flow rate inside. A large amount of high-speed oil enters the unloading valve cavity through the oil inlet channel 18 and the oil inlet 11. Part of the high-speed oil quickly fills the space between the housing 2 and the valve core 6, while most of the oil enters the first cavity 63 through the oil inlet hole 61 around the outer circle of the valve core 6, establishing high pressure. The generated high pressure p acts on the left end face of the needle rod 5, and the pressure p pushes the needle rod 5 to move to the right. When the movement force of the needle rod 5 reaches the elastic force of the second spring 8, the needle rod 5 pushes the valve sleeve 7 to compress the second spring 8 and move together. When the valve sleeve 7 moves to contact the mounting seat 9, the twelve evenly distributed oil outlet holes 62 on the valve core 6 that were covered are quickly opened, and the high-speed oil is quickly discharged through the oil outlet holes 62. Once the pressure is released, the valve sleeve 7 and needle rod 5 are pushed to their initial installation position by the second spring 8. In this position, the valve sleeve 7 covers the oil outlet 62 of the valve core 6, and the unloading valve closes, completing the unloading function. This unloading valve prevents a sharp increase in the speed of the chassis stabilizing buffer actuator, reduces the peak load when the aircraft crosses pavement steps and hills, and ensures the safe and stable operation of the landing gear.

[0029] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the present embodiments by those skilled in the art will fall within the scope defined by the appended claims.

Claims

1. A type of unloading valve, characterized in that: Includes a housing (2) and a first spring (3), a needle rod (5), a valve core (6), a valve sleeve (7), a second spring (8) and a mounting base (9) disposed inside the housing (2), wherein the side wall of the valve core (6) is engaged with the inner wall of the housing (2); The end of the housing (2) is sealed by a screw plug (1), and the side wall of the housing (2) is provided with an oil inlet (11) and an oil return port (12). One end of the valve core (6) is provided with a first cavity (63) along the length direction, and the other end is in clearance fit with the inner hole of the valve sleeve (7). The first cavity (63) is sealed by a screw plug (1). The valve core (6) has an oil inlet hole (61) and an oil outlet hole (62) on its side wall. Both the oil inlet hole (61) and the oil outlet hole (62) are connected to the first cavity (63). The oil inlet hole (61) is connected to the oil inlet (11). One end of the needle rod (5) is located in the first cavity (63) and a first gap (13) is provided between it and the screw plug (1). The other end passes through the valve core (6) and abuts against the inner hole of the valve sleeve (7). The needle rod (5) and the valve core (6) are fitted with a gap. Under hydraulic action, the needle rod (5) reciprocates inside the first cavity (63) of the valve core (6). One end of the mounting base (9) is fixedly connected to the housing (2), and the other end is disposed opposite to the valve sleeve (7) and provided with a second gap (14). The second spring (8) is sleeved on the mounting base (9) and the valve sleeve (7). At the initial installation position of the unloading valve, the inner wall of the valve sleeve (7) covers the oil outlet (62) of the valve core (6), so that a sealed cavity is formed between the valve sleeve (7) and the housing (2). This sealed cavity is the unloading valve return oil cavity (21), and the unloading valve return oil cavity (21) is connected to the return oil port (12). When the valve sleeve (7) moves to contact the mounting seat (9), the covered oil outlet (62) on the valve core (6) is quickly opened, and the high-speed oil flows out quickly through the oil outlet (62). When the pressure of the high-speed oil is relieved, the valve sleeve (7) and the needle rod (5) are pushed to the initial installation position under the action of the second spring (8). At this position, the valve sleeve (7) covers the oil outlet (62) of the valve core (6), and the unloading valve closes to complete the unloading function.

2. The unloading valve according to claim 1, characterized in that: The valve core (6) has multiple radially penetrating oil inlet holes (61) along the circumferential direction.

3. The unloading valve according to claim 2, characterized in that: The valve core (6) has multiple radially penetrating oil outlet holes (62) along the circumferential direction.

4. The unloading valve according to claim 3, characterized in that: The sum of the cross-sectional areas of the multiple oil inlets (61) is less than or equal to the sum of the cross-sectional areas of the multiple oil outlets (62).

5. The unloading valve according to claim 1, characterized in that: The plug (1) is connected to the housing (2) by a reinforced thread and sealed by a second seal (10).

6. The unloading valve according to claim 1, characterized in that: The connection between the needle rod (5) and the valve core (6) is provided with a first sealing element (4), which is located in the first cavity (63).

7. The unloading valve according to claim 1, characterized in that: The axes of the needle bar (5), valve sleeve (7) and mounting base (9) are collinear.

8. The unloading valve according to claim 1, characterized in that: The mounting base (9) is provided with a plurality of gaskets (15), and a partition is provided on the outside of the gaskets (15), and the second spring (8) abuts against the partition.

9. A frame stabilizing and buffering actuation device, comprising a high-pressure chamber (16) and a return oil chamber (17), characterized in that: It also includes the unloading valve as described in any one of claims 1 to 8, wherein the high-pressure chamber (16) is connected to the oil inlet (11) through the oil inlet channel (18), and the oil return chamber (17) is connected to the oil return port (12) through the oil return channel (19).

10. The vehicle frame stabilizing and buffering actuation device according to claim 9, characterized in that: The cross-sectional area of ​​the return oil channel (19) is greater than that of the inlet oil channel (18).

Images