Built-in valve air spring exhaust system pressure retaining valve

Abstract

The utility model belongs to the technical field of air spring accessories, and particularly relates to a built-in valve air spring exhaust system pressure retaining valve. The pressure retaining valve comprises an upper valve body arranged in an upper exhaust system of the air spring, an adjusting valve assembly capable of controlling connection and disconnection of the upper valve body and an air pressure cavity of the air spring, a connecting air pipe arranged at the outlet end of the upper valve body and a pressure retaining assembly arranged in the upper valve body and capable of controlling opening and closing of the connecting air pipe. The pressure maintaining assembly comprises a rheostat main valve body, a rheostat piston and an elastic piece; the rheostat main valve body comprises a first valve body connected to the connecting air pipe in a sealed mode and a second valve body connected with the first valve body, wherein an inner cavity of the second valve body is conical. When the air pressure in the air spring is smaller than a set value, the pressure retaining valve closes the exhaust channel so as to ensure that certain air pressure always exists in the air spring, and the technical problem that the service life of parts of the air spring is prolonged due to the fact that the air pressure in the existing air spring is easily emptied is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of air spring accessories, specifically relating to a pressure-holding valve for an air spring exhaust system with a built-in valve. Background Technology

[0002] An air spring is a sealed container filled with compressed air. It utilizes the compressibility of gas to achieve its elastic effect. Therefore, air springs can be used in vibration dampers. Air spring vibration dampers have the characteristics of nonlinear characteristics and a large load-bearing range.

[0003] After the air spring shock absorber is installed on the vehicle body, the vehicle body height changes with the road surface when the vehicle is driving on the road. During this process, the air spring is vented or inflated to adjust the height of the shock absorber, thereby improving the driver's comfort and preventing the road surface from being damaged by wheel impacts.

[0004] However, commercial vehicle air springs currently lack pressure-holding valves. After the vehicle stops running for a period of time, the air pressure inside the air springs will be completely released. When the driver gets back into the vehicle or when the vehicle is parked for repairs, the lack of air pressure inside the air springs, coupled with the need for movement in the cab, can cause the air spring components to collide or the capsule to be forcibly pulled, thus damaging the lifespan of the air spring components. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a pressure-holding valve for an air spring exhaust system with a built-in valve. This valve is installed within the exhaust system of the air spring. When the air pressure inside the air spring is lower than a set value, the pressure-holding valve closes the exhaust passage to ensure that there is always a certain air pressure inside the air spring. This solves the technical problem that current air springs easily exhaust their internal air pressure, leading to a decrease in the lifespan of air spring components.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a pressure-holding valve for an air spring exhaust system with a built-in valve, the pressure-holding valve including an upper valve body disposed in the exhaust system of the air spring, a regulating valve assembly capable of controlling the opening and closing of the air pressure chamber of the upper valve body and the air spring, a connecting air pipe disposed at the outlet end of the upper valve body, and a pressure-holding assembly disposed in the upper valve body and capable of controlling the opening and closing of the connecting air pipe.

[0007] The pressure-holding assembly includes a rheostat main valve body, a rheostat piston, and an elastic element; the rheostat main valve body includes a first valve body sealed to the connecting air pipe and a second valve body connected to the first valve body with a conical inner cavity, and a control port that can be opened by setting an air pressure is provided at the connection between the first valve body and the second valve body; the rheostat piston is conical in shape and slidably connected to the second valve body; the elastic element is located on the side of the rheostat piston away from the connecting air pipe;

[0008] When the rheostat piston closes the second valve body, the rheostat main valve body, the rheostat piston, and the connecting air pipe together form a first cavity, and the rheostat main valve body, the rheostat piston, the upper valve body, and the regulating valve assembly together form a second cavity. The first cavity and the second cavity can only be connected through the control port.

[0009] Preferably, the main valve body of the rheostat further includes a third valve body connected to the end of the second valve body away from the first valve body.

[0010] Preferably, the third valve body is sealed and supported on the inner wall of the upper valve body to separate the second cavity into two spaces; a control port that can be opened by setting the air pressure is provided at the connection between the second valve body and the third valve body.

[0011] Preferably, the elastic element is a compression spring.

[0012] Preferably, the connecting air pipe is sealed to the upper valve body through a first copper sleeve and a second copper sleeve, and the first copper sleeve, the second copper sleeve and the upper valve body are sequentially sleeved on the connecting air pipe.

[0013] Preferably, a connecting gas pipe sealing ring is provided between the main valve body of the rheostat and the first copper sleeve.

[0014] Preferably, the regulating valve assembly includes a reset rod and a sealing ring connected to the reset rod. The sealing ring is tapered and cooperates with a tapered groove at the end of the upper valve body to achieve the opening and closing of the opening at the end of the upper valve body.

[0015] Preferably, the regulating valve assembly further includes a push rod, one end of which abuts against the sealing ring and the other end of which abuts against the compression spring.

[0016] Preferably, a stop ring is provided on the outer peripheral surface of the push rod, and the compression spring is supported on the stop ring.

[0017] The beneficial effects of adopting the technical solution of this utility model are as follows:

[0018] The pressure-holding component of this invention can independently close the exhaust channel of the exhaust system. When the air pressure inside the air spring is lower than a set value, the pressure-holding component activates to close the exhaust channel, ensuring that a certain air pressure is always present inside the air spring. This prevents hard collisions between components due to the air pressure escaping from the air spring, which could affect its service life and extend the service life of the air spring vibration damper. By incorporating a rheostat main valve body, a rheostat piston, and an elastic element into the pressure-holding component, the rheostat main valve body includes a first valve body and a second valve body. The first valve body is sealed to the connecting air pipe, and the second valve body is conically fitted to the rheostat piston. When no external force is applied, the elastic element elastically supports the rheostat piston to close the second valve body. This isolates the pressure-holding component and the connecting air pipe, as well as the pressure-holding component and the upper valve body, into two independent spaces: a first chamber and a second chamber. The control port located at the connection between the first and second valve bodies can be opened by setting a pressure to connect the two chambers. Each air spring has an independent space. With this setup, when the air spring needs to release pressure, the pressure release channel of the pressure release system opens, the elastic element supports the variable resistor piston to close the second valve body, and when the air pressure in the pressure release channel is greater than the set value, the control port opens and air pressure enters the first chamber. The air pressure in the first chamber pushes the variable resistor piston to move in the opposite direction to open the second valve body channel, thus initiating pressure release. When the air pressure in the pressure release channel is less than the set value, the control port closes, and the variable resistor piston resets under the action of the elastic element to close the first valve body. The exhaust channel is closed and pressure release stops, ensuring that the air pressure inside the air spring is not emptied. Attached Figure Description

[0019] Figure 1 A schematic diagram of an embodiment of a pressure-holding valve for a built-in valve air spring exhaust system;

[0020] Figure 2 A schematic diagram of the pressure-holding assembly for an embodiment of a pressure-holding valve in an air spring exhaust system with a built-in valve;

[0021] Figure 3 A schematic diagram of the main valve body of a rheostat in an embodiment of a pressure-holding valve for an air spring exhaust system with a built-in valve.

[0022] Figure 4 This is a schematic diagram of an air spring damper assembly with a built-in valve.

[0023] in, Figure 1-4 In the middle, 1-connecting air pipe, 2-first copper sleeve, 3-second copper sleeve, 4-connecting air pipe sealing ring, 5-variable rheostat main valve body, 6-variable rheostat piston, 7-elastic element, 8-upper valve body sealing ring, 9-push rod, 10-sealing ring, 11-reset rod, 12-lower valve body, 13-upper valve body, 14-first valve body, 15-second valve body, 16-third valve body, 17-control port, 18-stop ring, A-first chamber, B-third chamber, C-fourth chamber. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments, and do not limit the scope of the present utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The specific implementation method is as follows:

[0028] Example 1, as Figure 1-4 As shown, the built-in valve air spring exhaust system pressure holding valve includes an upper valve body 13, a regulating valve assembly, a connecting air pipe 1, and a pressure holding assembly. A lower valve body 12 is located on the lower left side of the air spring damper assembly. The upper valve body 13 is connected to the lower valve body 12 via a threaded connection and communicates with the air pressure chamber of the air spring. To ensure the sealing of the connection, an annular groove is provided on the outer circumferential surface of the upper valve body 13, and an upper valve body sealing ring 8 is embedded in the groove.

[0029] The connecting air pipe 1 is connected to the air outlet of the upper valve body 13 and communicates with the outside. In this embodiment, the connecting air pipe 1 is connected to the upper valve body 13 through a first copper sleeve 2 and a second copper sleeve 3. The second copper sleeve 3 is embedded in the inner wall of the upper valve body 13, and the first copper sleeve 2 is embedded in the second copper sleeve 3 and sleeved on the outside of the connecting air pipe 1, so as to achieve a sealed connection between the connecting air pipe 1 and the upper valve body 13.

[0030] An adjusting valve assembly is provided at the air inlet end of the upper valve body 13 to control the opening and closing between the air pressure chamber of the air spring and the upper valve body 13. That is, when exhaust is required, the adjusting valve assembly opens the exhaust passage of the upper valve body 13, and when exhaust is not required, the adjusting valve assembly closes the exhaust passage.

[0031] The pressure-holding assembly is located inside the upper valve body 13 near the connecting air pipe 1, and can control the opening and closing of the connecting air pipe 1. The pressure-holding assembly includes a rheostat main valve body 5, a rheostat piston 6, and an elastic element 7.

[0032] The main valve body 5 of the rheostat includes a first valve body 14 and a second valve body 15. The end of the first valve body 14 is sealed to the connecting air pipe 1. The end of the first valve body 14 away from the connecting air pipe 1 extends inward to form a connecting part, and the second valve body 15 is connected through this connecting part. A through slit is cut in this connecting part to form a control port 17, which is used to connect the inside and outside of the first valve body 14. The control port 17 can be opened by impact with a certain air pressure. The inner cavity of the second valve body 15 is tapered. The rheostat piston 6 is slidably connected inside the second valve body 15 and its shape matches the tapered inner cavity of the second valve body 15. The rheostat piston 6 slides against the inner wall of the second valve body 15 to close the second valve body 15, and the rheostat piston 6 slides away from the inner wall of the second valve body 15 to open the second valve body 15. The elastic element 7 is located on the side of the rheostat piston 6 away from the first valve body 14. Its elasticity supports the rheostat piston 6. When there is no other external force, the elastic element 7 supports the rheostat piston 6 to close the second valve body 15.

[0033] When the rheostat piston 6 closes the second valve body 15, the end portion of the rheostat piston 6 protrudes through the second valve body 15 and is sealed against the end of the connecting air pipe 1. The rheostat main valve body 5, the rheostat piston 6 and the connecting air pipe 1 enclose the first cavity A. The rheostat main valve body 5, the rheostat piston 6, the upper valve body 13 and the regulating valve assembly enclose the second cavity. The first cavity A and the second cavity can only be connected through the control port 17.

[0034] In this embodiment, the elastic element 7 is a helical compression spring, with one end supported on the rheostat piston 6 and the other end abutting against the regulating valve assembly to ensure the stability of the support.

[0035] In this embodiment, the opening and closing principle of the control port mainly utilizes the expansion coefficient of the main valve body material of the rheostat itself. The thickness and area of ​​the main valve body of the rheostat are designed according to the set air pressure, and the corresponding elastic element is matched to complete its function.

[0036] In this embodiment, when the built-in valve air spring exhaust system pressure holding valve is in use, the air spring needs to be vented when the air spring damper assembly is in a stretched state. The regulating valve assembly opens the air inlet of the upper valve body 13, and the gas enters the exhaust channel of the upper valve body 13 and enters the second chamber. When the air pressure in the air spring exceeds the set value, the control port 17 on the connection part of the first valve body 14 opens, and the gas enters the first chamber A. The gas in the first chamber A pushes the rheostat piston 6 in the opposite direction a certain distance (the air pressure in the first chamber A and the second chamber is kept consistent. When the overall air pressure reaches a certain level, the weakest part deforms first. Therefore, the elastic element 7 will be compressed first, and the rheostat piston 6 will be pushed in the opposite direction). The second valve body 15 is opened, and the gas is discharged through the connecting air pipe 1 to release the pressure. When the air pressure inside the air spring drops to the set value, due to insufficient air pressure, the elastic element 7 pushes the rheostat piston 6 to reset and close the second valve body 15. The control port 17 on the connection part of the first valve body 14 closes, and the connecting air pipe 1 closes, stopping pressure release. Therefore, a certain pressure is always maintained in the air pressure chamber of the air spring, preventing it from emptying and thus extending the service life of the air spring damper. Furthermore, the air pressure value at which the control port 17 is opened can be set according to the material, thickness, and area of ​​the rheostat main valve body.

[0037] Furthermore, a connecting air pipe sealing ring 4 is provided between the main valve body 5 of the rheostat and the first copper sleeve 2 to ensure the sealing of the connection between the first valve body 14 and the connecting air pipe 1.

[0038] Furthermore, the regulating valve assembly includes a reset rod 11 and a sealing ring 10. The sealing ring 10 is tapered and tightly fitted onto the end of the reset rod 11. The reset rod 11 is sealed to the lower valve body 12 via a sliding bearing, and an air hole is provided on the reset rod to connect the spaces at both ends of the sliding bearing. More specifically, a tapered groove is provided at the end of the air inlet of the upper valve body 13, which communicates with the exhaust channel inside the upper valve body 13. The sealing ring 10 cooperates with the tapered groove. When the sealing ring 10 moves to the left and presses against the tapered groove, it closes the air inlet of the upper valve body 13. When the sealing ring 10 moves in the opposite direction and disengages from the tapered groove, it opens the air inlet of the upper valve body 13. This design is not only simple in structure but also convenient for opening and closing operations.

[0039] Furthermore, the regulating valve assembly also includes a push rod 9. The push rod 9 is disposed between the pressure-holding assembly and the conical groove of the upper valve body 13. One end of the push rod 9 extends into the conical groove of the upper valve body 13 and abuts against the sealing ring 10, while the other end is connected to the elastic element 7. An air hole is provided on the push rod 9. When the sealing ring 10 opens the conical groove, gas enters the second cavity of the upper valve body through the air hole on the push rod 9. Based on this, when the air spring damper assembly is in a compressed state, a structural component acting on the reset rod 11 is provided inside the air spring (this structure is described in other patents and will not be detailed again as prior art), causing the reset rod 11 to move to the left and fit tightly against the sealing conical groove; when the air spring damper assembly is in a stretched state, the reset rod 11 loses the force of the structural component inside the air spring, and under the elastic support of the elastic component 7, one end of the elastic component 7 supports the push rod 9 to move to the right, driving the sealing ring 10 to move to the right and disengage from the inner wall of the conical groove, realizing the connection between the upper valve body 13 and the air pressure chamber inside the air spring; the other end of the elastic component 7 supports the rheostat piston 6 to move to the left, and the rheostat piston 6 fits tightly against the second valve body 15 and closes.

[0040] Furthermore, a stop ring 18 protruding outward is provided on the outer circumferential surface of the push rod 9. On the one hand, the compression spring is supported on the stop ring 18, and on the other hand, the stop ring can also prevent the push rod 9 from entering the tapered groove too much.

[0041] Example 2, as Figure 1-3 As shown, the pressure-holding valve of the built-in valve air spring exhaust system differs from the above embodiment in that the main valve body 5 of the rheostat also includes a third valve body 16. The end of the third valve body 16 extends inwardly with a connecting portion, which connects to the end of the second valve body 15 away from the first valve body 14. In this embodiment, the outer diameter of the second valve body 15 is smaller than the outer diameters of the first valve body 14 and the third valve body 16, and a through-hole is cut in the connecting portion to form a control port 17, which can be opened by impact with a certain air pressure.

[0042] More specifically, the third valve body 16 is sealed and supported on the inner wall of the upper valve body 13 to ensure the stability of the connection of the main valve body 5 of the rheostat within the upper valve body 13, and to separate the second chamber into two independent spaces, namely the third chamber B and the fourth chamber C. The third chamber B and the fourth chamber C are connected by a control port 17 on the connecting part of the third valve body 16. When the gas pressure is greater than the set value, the two control ports 17 are opened sequentially, allowing the gas to finally enter the first chamber A.

[0043] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A hold valve for an air spring vent system having a built-in valve, characterized by, The pressure maintaining valve comprises an upper valve body arranged in an air spring exhaust system, an adjusting valve assembly capable of controlling the air pressure cavity of the upper valve body and the air spring, a connecting air pipe arranged at an outlet end of the upper valve body, and a pressure maintaining assembly arranged in the upper valve body and capable of controlling the opening and closing of the connecting air pipe. The pressure maintaining assembly comprises a rheostat main valve body, a rheostat piston and an elastic member; the rheostat main valve body comprises a first valve body sealingly connected to the connecting air pipe and a second valve body connected to the first valve body and having a tapered inner cavity; the first valve body and the second valve body are provided with a control port capable of being opened by setting air pressure; the rheostat piston has a tapered shape matching the inner cavity of the second valve body and is slidingly connected in the second valve body; the elastic member is arranged on a side of the rheostat piston away from the connecting air pipe. When the rheostat piston closes the second valve body, a first cavity is formed between the rheostat main valve body, the rheostat piston and the connecting air pipe, and a second cavity is formed between the rheostat main valve body, the rheostat piston, the upper valve body and the adjusting valve assembly; the first cavity and the second cavity are only capable of being communicated through the control port.

2. The valved air spring bleed system hold valve of claim 1, wherein, The rheostat main valve body further comprises a third valve body connected to an end of the second valve body away from the first valve body.

3. The valved air spring vent system hold valve of claim 2, wherein, The third valve body is sealingly supported on the inner wall of the upper valve body to divide the second cavity into two spaces; the second valve body and the third valve body are provided with a control port capable of being opened by setting air pressure.

4. The valved air spring bleed system hold valve of claim 3, wherein, The elastic member is a compression spring.

5. The valved air spring vent system hold valve of any of claims 1-4, wherein, The connecting air pipe is sealingly connected to the upper valve body through a first copper sleeve and a second copper sleeve; the first copper sleeve, the second copper sleeve and the upper valve body are sequentially sleeved on the connecting air pipe.

6. The valved air spring bleed system hold valve of claim 5, wherein, A connecting air pipe sealing ring is arranged between the rheostat main valve body and the first copper sleeve.

7. The valved air spring vent system hold valve of claim 4, wherein, The adjusting valve assembly comprises a reset rod and a sealing ring connected to the reset rod; the sealing ring is tapered and matched with a tapered groove arranged at an end of the upper valve body to control the opening and closing of the end opening of the upper valve body.

8. The valved air spring bleed system hold valve of claim 7, wherein, The adjusting valve assembly further comprises a push rod, one end of the push rod abutting against the sealing ring and the other end abutting against the compression spring.

9. The valved air spring vent system hold valve of claim 8, wherein, The outer circumferential surface of the push rod is provided with a stop ring, and the compression spring is supported on the stop ring.

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