Pilot-operated overflow valve, shock absorber, suspension system and vehicle

Abstract

The utility model discloses a pilot operated overflow valve, a shock absorber, a suspension system and a vehicle. The pilot-operated overflow valve comprises a pilot valve and an overflow valve. The pilot valve comprises a pilot valve element. The overflow valve comprises an overflow valve seat and an overflow valve core, the overflow valve seat is matched with the main body and is provided with an overflow valve port, the overflow valve core is provided with a pilot valve port, the overflow valve core and the overflow valve port are in conical surface sealing, and / or the pilot valve core and the pilot valve port are in conical surface sealing. In the application, the possibility and range of forming laminar flow when the fluid flows through the overflow valve port and / or the pilot valve port are smaller, so that the throttling effect is basically not influenced by the viscosity of the fluid, and the damping effect of the damper can be ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, and more particularly to a pilot overflow valve, a shock absorber, a suspension system and a vehicle. BACKGROUND

[0002] A shock absorber is a device capable of absorbing vibration energy by using the throttling dissipation effect of fluid (such as oil liquid, etc.) flowing through a hole valve system. The shock absorber can be applied to the field of vehicles to improve the smoothness of vehicle driving. In the related art, the working environment temperature of the shock absorber can reach -40℃-120℃, at this time, the physical properties of the fluid, especially the fluid viscosity, will change greatly. However, the throttling effect is greatly affected by the fluid viscosity, thereby causing the damping performance of the shock absorber to be greatly affected by the high and low temperature environments. Therefore, how to provide a shock absorber with good performance in high and low temperature environments has become a technical problem to be solved by those skilled in the art. SUMMARY

[0003] The present application provides a pilot overflow valve, a shock absorber, a suspension system and a vehicle to solve at least one of the above technical problems.

[0004] The pilot overflow valve of the present application includes a pilot valve and an overflow valve. The pilot valve includes a pilot valve core. The overflow valve includes an overflow valve seat and an overflow valve core, the overflow valve seat is matched with the main body and is provided with an overflow valve port, the overflow valve core is provided with a pilot valve port, and the overflow valve core and the overflow valve port are in conical surface sealing, and / or the pilot valve core and the pilot valve port are in conical surface sealing.

[0005] In some embodiments, wherein L is the length of the sealing surface between the overflow valve core and the overflow valve port, or the pilot valve core and the pilot valve port in the flow direction of the fluid; δ max is the maximum opening of the overflow valve core or the pilot valve core.

[0006] In some embodiments, δ max ≤ 0.3mm.

[0007] In some embodiments, the pilot valve core is provided with a first conical surface, the first conical surface is used to form a conical surface sealing cooperation with the pilot valve port, and the included angle between the first conical surface and the radial direction of the pilot valve core is greater than or equal to 30°.

[0008] In some embodiments, the pilot valve core includes a first end surface in the axial direction of the pilot valve core, and the connection between the first end surface and the first conical surface is a circular arc surface.

[0009] In some embodiments, the spool of the spill valve is provided with a second conical surface configured to form a conical sealing with the port of the spill valve, and the angle between the radial direction of the spool of the spill valve and the radial direction of the spool of the pilot valve is greater than or equal to 30°.

[0010] In some embodiments, the spool of the spill valve is provided with a second end surface in the axial direction of the spool of the spill valve, and the connection between the second end surface and the second conical surface is a circular arc surface, and the axial direction of the spool of the pilot valve is the same as the axial direction of the spool of the spill valve.

[0011] In some embodiments, the pilot valve further comprises a main body provided with a receiving cavity and a containing cavity, at least a part of the spool of the pilot valve is movably arranged in the receiving cavity, the seat of the spill valve is arranged in cooperation with the main body, the port of the pilot valve is in communication with the containing cavity, and at least a part of the spool of the spill valve is movably arranged in the containing cavity.

[0012] In some embodiments, the main body comprises a valve body and a pilot valve seat, the valve body and the pilot valve seat are connected and jointly form the receiving cavity, the pilot valve seat is provided with the containing cavity, one end of the spool of the spill valve is arranged in the pilot valve seat, and the other end of the spool of the spill valve is arranged in cooperation with the port of the spill valve.

[0013] In some embodiments, the spool of the spill valve is provided with a through hole configured to allow the fluid at the port of the spill valve to flow into the containing cavity.

[0014] In some embodiments, the valve body is provided with a through hole configured to allow the fluid to flow out of the receiving cavity.

[0015] In some embodiments, the pilot spill valve further comprises a first elastic member and a second elastic member. The first elastic member is arranged between the spool of the pilot valve and the valve body, and is configured to keep the spool of the pilot valve in cooperation with the port of the pilot valve. The second elastic member is arranged between the spool of the spill valve and the pilot valve seat, and is configured to keep the spool of the spill valve in cooperation with the port of the spill valve.

[0016] In some embodiments, the pilot spill valve further comprises a sealing member arranged between the spool of the spill valve and the side wall of the containing cavity, and configured to seal the gap between the spool of the spill valve and the side wall of the containing cavity.

[0017] In some embodiments, the valve body is provided with a mounting hole. The pilot spill valve further comprises a guide sleeve, at least a part of the guide sleeve is arranged in the mounting hole, and the spool of the pilot valve is movably arranged in cooperation with the guide sleeve.

[0018] The damper of the embodiments of the present application comprises the pilot overflow valve of the above-mentioned embodiments.

[0019] The suspension system of the embodiments of the present application comprises the damper of the above-mentioned embodiments.

[0020] The vehicle of the embodiments of the present application comprises the suspension system of the above-mentioned embodiments.

[0021] In the pilot overflow valve, the damper, the suspension system and the vehicle of the embodiments of the present application, the overflow valve spool and the overflow valve port are in conical surface sealing, and / or the pilot valve spool and the pilot valve port are in conical surface sealing. Compared with the overflow valve spool and the overflow valve port being in planar sealing, and / or the pilot valve spool and the pilot valve port being in planar sealing, the length of the sealing surface is smaller, thereby reducing the possibility and range of the fluid forming laminar flow when flowing through the overflow valve port and / or the pilot valve port, so that the throttling effect is basically not affected by the viscosity of the fluid, and the high and low temperature performance of the damper can be optimized, and the damping effect of the damper can be ensured.

[0022] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0024] Figure 1 is a structural schematic diagram of a vehicle of some embodiments of the present application;

[0025] Figure 2 is a structural schematic diagram of a vehicle of some embodiments of the present application; Figure 1 is a structural schematic diagram of a pilot overflow valve of a damper in the vehicle shown in FIG. 1;

[0026] Figure 3 is a structural schematic diagram of a pilot overflow valve of a damper in the vehicle shown in FIG. 1; Figure 2 is a sectional structural schematic diagram of the pilot overflow valve shown in FIG. 2;

[0027] Figure 4 is a sectional structural schematic diagram of the pilot overflow valve shown in FIG. 2; Figure 3 is an enlarged schematic diagram of the position IV in FIG. 3;

[0028] Figure 5 is an enlarged schematic diagram of the position V in FIG. 3; Figure 3 is an enlarged schematic diagram of the position V in FIG. 3.

[0029] Explanation of main element symbols:

[0030] 6000 vehicle; 5000 suspension system; 4000 vehicle body; 3000 vehicle wheel; 2100 damper; 2300 suspension;

[0031] 1000 pilot-operated relief valve;

[0032] 10 pilot valve, 11 main body, 101 accommodating chamber, 103 accommodating chamber, 111 valve body, 1111 through hole, 1113 mounting hole, 113 pilot valve seat, 13 pilot valve core, 131 first conical surface, 133 first end surface;

[0033] 30 relief valve, 31 relief valve seat, 311 relief valve port, 33 relief valve core, 331 pilot valve port, 333 second conical surface, 335 second end surface, 337 through hole;

[0034] 50 first elastic member; 70 second elastic member; 80 sealing member; 90 guide sleeve. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] In the description of this application, it should be understood that the terms "center", "length", "up", "down", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connected", "connecting" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0039] In this application, unless otherwise clearly indicated and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact or indirectly contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] Please refer to Figure 1 The vehicle 6000 of the embodiments of the present application comprises a suspension system 5000. The vehicle 6000 includes but is not limited to a passenger vehicle such as an electric vehicle, a hybrid vehicle, or a large engineering vehicle with not very harsh working conditions.

[0041] Further, in some embodiments, the vehicle 6000 further comprises a vehicle body 4000 and a wheel 3000, the wheel 3000 is arranged on the vehicle body 4000 and can move relative to the vehicle body 4000 to realize the movement (such as forward, backward or turning) of the vehicle 6000. One end of the suspension system 5000 is connected with the vehicle body 4000, and the other end is connected with the wheel 3000. The suspension system 5000 can adjust the relative distance between the vehicle body 4000 and the wheel 3000 to improve the smoothness of the vehicle 6000.

[0042] In the embodiments of the present application, the vehicle 6000 comprises the suspension system 5000, and it can be understood that the vehicle 6000 at least comprises the same beneficial effects as the suspension system 5000. Therefore, the beneficial effects of the vehicle 6000 are described below in the beneficial effects of the suspension system 5000.

[0043] Please continue to refer to Figure 1 The suspension system 5000 of the embodiments of the present application comprises a shock absorber 2100.

[0044] The damper 2100 is a device capable of absorbing vibration energy and accelerating vibration damping in the suspension system 5000. In some embodiments of the present application, the suspension system 5000 further comprises a suspension 2300 connecting the vehicle body 4000 and the wheel 3000, and the damper 2100 is connected with the suspension 2300. In the case that the wheel 3000 is subjected to an impact force, the impact force can be transmitted through the suspension 2300, and in this case, the damper 2100 can generate a damping force to offset or weaken the impact force, so as to reduce the impact force transmitted to the vehicle body 4000, thereby improving the driving stability and ride comfort of the vehicle 6000.

[0045] Specifically, in some embodiments, the damper 2100 comprises a cylinder and a piston arranged in the cylinder, the cylinder contains a fluid (such as oil, etc.), and the piston can divide the cavity inside the cylinder into a compression chamber and a recovery chamber, and the piston is connected with the suspension 2300 through a piston rod. When the piston rod drives the piston to move up and down, the fluid can flow between the compression chamber and the recovery chamber and generate a damping force.

[0046] For example, during the driving of the vehicle 6000, when the wheel 3000 is subjected to a road impact, the wheel 3000 jumps up, at this time, the suspension 2300 can move up together with the wheel 3000, in this case, the piston rod of the damper 2100 moves down and drives the piston to move down, the fluid in the compression chamber flows to the recovery chamber through the orifice valve system (such as the pilot overflow valve 1000 described below, etc.) and flows to the recovery chamber through the piston valve, thereby generating a damping force to buffer the vibration of the suspension 2300 and improve the driving performance of the vehicle 6000; in the case that the wheel 3000 jumps down, the suspension 2300 can move down together with the wheel 3000, in this case, the piston rod of the damper 2100 moves up and drives the piston to move up, the fluid in the recovery chamber can flow to the compression chamber through the piston valve, thereby generating a damping force to buffer the vibration of the suspension 2300 and improve the driving performance of the vehicle 6000.

[0047] Since the suspension system 5000 in the present embodiment comprises the damper 2100, it can be understood that the suspension system 5000 at least comprises the same beneficial effects as the damper 2100, and therefore, the beneficial effects of the suspension system 5000 are described below in the beneficial effects of the damper 2100.

[0048] Please refer to Figure 1 and Figure 2 The damper 2100 in some embodiments of the present application comprises a pilot overflow valve 1000. It should be noted that the pilot overflow valve 1000 is a device in the damper 2100 capable of functions such as pressure setting overflow, pressure stabilization, system unloading, and safety protection, etc.

[0049] In the present embodiment, the damper 2100 includes the pilot overflow valve 1000, and thus the damper 2100 has the same beneficial effects as the pilot overflow valve 1000. The beneficial effects of the damper 2100 are described below in the description of the pilot overflow valve 1000.

[0050] Referring to Figure 2 and Figure 3 in combination with Figure 4 and Figure 5 the pilot overflow valve 1000 of the present embodiment includes a pilot valve 10 and an overflow valve 30. The pilot valve 10 includes a pilot spool 13. The overflow valve 30 includes an overflow valve seat 31 and an overflow valve spool 33. The overflow valve seat 31 is provided with an overflow valve port 311. The overflow valve spool 33 is provided with a pilot valve port 331. The overflow valve spool 33 is in conical sealing with the overflow valve port 311, and / or the pilot spool 13 is in conical sealing with the pilot valve port 331.

[0051] Further, in some embodiments, the pilot valve 10 further includes a main body 11. The main body 11 is provided with a spacing accommodating cavity 101 and a receiving cavity 103. At least a portion of the pilot spool 13 is movably arranged in the accommodating cavity 101. The overflow valve seat 31 cooperates with the main body 11. The pilot valve port 331 is in communication with the receiving cavity 103. At least a portion of the overflow valve spool 33 is movably arranged in the receiving cavity 103.

[0052] It can be understood that the main body 11 is a structure for loading the pilot spool 13 and other devices in the pilot overflow valve 1000. The material of the main body 11 includes but is not limited to cast iron, cast steel, or stainless steel, etc. For example, the material of the main body 11 includes cast iron. The cast iron has good mechanical properties and corrosion resistance, so that the main body 11 can be suitable for various fluids and working environments. In some embodiments of the present application, the main body 11 includes a valve body 111 and a pilot valve seat 113. The valve body 111 and the pilot valve seat 113 are connected and cooperatively form the accommodating cavity 101. The pilot valve seat 113 is provided with the receiving cavity 103. The cross section of the accommodating cavity 101 can be the same as or different from the cross section of the receiving cavity 103. The cross section of the accommodating cavity 101 and the receiving cavity 103 includes but is not limited to a circular shape, a square shape, a polygonal shape, etc.

[0053] In some embodiments, the valve body 111 and the pilot valve seat 113 are an integral structure, i.e., the valve body 111 and the pilot valve seat 113 are integrally formed by using an integral molding process, so as to ensure the bonding strength between the valve body 111 and the pilot spool 13, and to improve the stability and reliability of the pilot overflow valve 1000. In other embodiments, the valve body 111 and the pilot valve seat 113 are a split structure, i.e., the valve body 111 and the pilot valve seat 113 are two different structures. The valve body 111 and the pilot valve seat 113 can be combined together by using a detachable connection manner or a non-detachable connection manner. The detachable connection manner includes but is not limited to clamping, bolt connection or interference fit, etc. The non-detachable connection manner includes but is not limited to bonding or welding, etc.

[0054] The pilot spool 13 is a structure for cooperating with the pilot valve port 331 to control the flow of fluid in the pilot overflow valve 1000. The material of the pilot spool 13 includes but is not limited to stainless steel or cast iron, etc. In some embodiments of the present application, one end of the pilot spool 13 is arranged in the valve body 111, and the other end cooperates with the pilot valve port 331. That is, the pilot spool 13 can selectively open or close the pilot valve port 331 when the pilot spool 13 moves. Specifically, when the pilot spool 13 moves away from the pilot valve port 331, the pilot valve port 331 is opened, and the fluid can flow into the accommodation cavity 101 through the gap between the pilot valve port 331 and the pilot spool 13. It should be noted that in some embodiments, the fluid includes but is not limited to oil (such as hydraulic oil) or magnetorheological fluid, etc.

[0055] The overflow valve seat 31 is a structure for loading the overflow valve spool 33 and other devices in the pilot overflow valve 1000. The material of the overflow valve seat 31 includes but is not limited to cast iron, cast steel or stainless steel, etc. For example, the material of the overflow valve seat 31 includes cast iron, which has good mechanical properties and corrosion resistance, so that the overflow valve seat 31 can be suitable for various fluids and working environments. In some embodiments of the present application, the overflow valve seat 31 cooperates with the pilot valve seat 113, and has an opening between the overflow valve seat 31 and the pilot valve seat 113, which is used for the flow of fluid.

[0056] The overflow valve spool 33 is a structure in the pilot overflow valve 1000 for cooperating with the overflow valve port 311 to control fluid flow. The material of the overflow valve spool 33 includes, but is not limited to, stainless steel or cast iron, etc. In some embodiments of the present application, one end of the overflow valve spool 33 is provided in the pilot valve seat 113, and the other end of the overflow valve spool 33 cooperates with the overflow valve port 311. That is, the overflow valve spool 33 can selectively open or close the overflow valve port 311 when the overflow valve spool 33 moves. Specifically, when the overflow valve spool 33 closes the overflow valve port 311, fluid can flow into the accommodation cavity 103 through the through hole (for example, the through hole 337 described below) on the overflow valve seat 31; when the overflow valve spool 33 opens the overflow valve port 311, fluid can flow out to the outside (such as a liquid storage cavity or an oil tank, etc.) through the gap between the overflow valve port 311 and the overflow valve spool 33, and the opening between the overflow valve seat 31 and the pilot valve seat 113.

[0057] The conical sealing refers to the sealing effect of liquid, gas, powder and other substances through compression and compaction between the conical surfaces. In some embodiments of the present application, the overflow valve spool 33 and the overflow valve port 311 are conical sealing, that is, the sealing surface between the overflow valve spool 33 and the overflow valve port 311 is a pair of conical surfaces in contact, so that the overflow valve spool 33 can seal the overflow valve port 311. Correspondingly, the pilot valve spool 13 and the pilot valve port 331 are conical sealing, that is, the sealing surface between the pilot valve spool 13 and the pilot valve port 331 is a pair of conical surfaces in contact, so that the overflow valve spool 33 can seal the overflow valve port 311. In addition, compared with the flat sealing, the contact area of the conical sealing is smaller, so that the sealing force is more concentrated, the sealing effect is better, and the impact resistance is stronger, so as to ensure the stability and reliability of the pilot overflow valve 1000.

[0058] Please refer to Figure 4 and Figure 5 , in some embodiments of the present application, the first conical surface 131 is arranged on the pilot valve spool 13, and the second conical surface 333 is arranged on the overflow valve spool 33.

[0059] Specifically, the pilot spool 13 includes opposite first and second ends in the axial direction X1 of the pilot spool 13, the first end of the pilot spool 13 is matched with the pilot port 331, the second end of the pilot spool 13 penetrates the valve body 111, the first taper surface 131 is arranged at the first end of the pilot spool 13, and the cross section of the first taper surface 131 gradually decreases in the direction from the second end of the pilot spool 13 to the first end of the pilot spool 13; the relief spool 33 includes opposite first and second ends in the axial direction X2 of the relief spool 33, the first end of the relief spool 33 is matched with the relief port 311, the second end of the relief spool 33 penetrates the pilot valve seat 113, the second taper surface 333 is arranged at the first end of the relief spool 33, and the cross section of the second taper surface 333 gradually decreases in the direction from the second end of the relief spool 33 to the first end of the relief spool 33. The axial direction X1 of the pilot spool 13 is the same as the axial direction X2 of the relief spool 33.

[0060] More specifically, the pilot port 331 is provided with a third taper surface at one end of the pilot spool 13, the cross section of the third taper surface gradually decreases in the direction from the second end of the pilot spool 13 to the first end of the pilot spool 13, the slope of the first taper surface 131 is the same as the slope of the third taper surface, so that the first taper surface 131 and the second taper surface 333 can form a taper surface seal; the relief port 311 is provided with a fourth taper surface at one end of the relief spool 33, the cross section of the fourth taper surface gradually decreases in the direction from the second end of the relief spool 33 to the first end of the relief spool 33, the slope of the second taper surface 333 is the same as the slope of the fourth taper surface, so that the second taper surface 333 and the fourth taper surface can form a taper surface seal.

[0061] It should be noted that the pressure loss of the fluid flowing through the orifice valve system includes the frictional pressure loss and the local pressure loss. The frictional pressure loss is the energy loss of the fluid flowing in the straight pipe with constant diameter due to the action of the fluid internal friction; the local pressure loss is the pressure loss caused by impact, separation, vortex and other phenomena when the fluid passes through the valve, elbow or suddenly changes interface. The energy loss caused by the action of the fluid internal friction (frictional pressure loss) is expressed as:

[0062]

[0063] Wherein, λ is the frictional resistance coefficient; L is the length of the straight pipe; ρ is the fluid density; v is the flow velocity of the fluid; d is the diameter of the straight pipe.

[0064] In the case of laminar flow of the fluid, the frictional resistance coefficient λ is

[0065] In the case of turbulent flow of the fluid, the frictional resistance coefficient λ is

[0066] Reynolds number R e satisfies: wherein μ is the fluid viscosity.

[0067] In summary, the pressure loss along the flow path is affected by the fluid viscosity (μ) and the length-diameter ratio (L / d) of the straight pipe, and the fluid viscosity has a greater impact on the fluid in the laminar flow state than in the turbulent flow state; the expression of the local pressure loss is consistent with that of the pressure loss along the flow path, while the local resistance coefficient is related to the structure parameters of the valve, elbow, and interface with sudden changes, i.e., the local pressure loss is not affected by the fluid viscosity (μ).

[0068] Since the opening degrees of the pilot spool 13 and the relief spool 33 are both small, if the length of the sealing surface is long, the fluid is prone to form a laminar flow at the valve port (the pilot valve port 331 or the relief valve port 311), which will result in a greater impact of the fluid viscosity on the throttling effect and poor high-low temperature performance. In some embodiments of the present application, the relief spool 33 and the relief valve port 311 are in conical surface sealing, and the pilot spool 13 and the pilot valve port 331 are in conical surface sealing. Compared with flat sealing, the length (L) of the sealing surface is smaller, which can reduce the possibility and range of the fluid forming a laminar flow when flowing through the pilot valve port 331 and the relief valve port 311, reduce or even avoid the impact of the fluid viscosity on the throttling effect, i.e., reduce the sensitivity of the throttling effect to temperature, and optimize the high-low temperature performance of the pilot relief valve 1000 and the shock absorber 2100.

[0069] In the pilot relief valve 1000 of the present application, the relief spool 33 and the relief valve port 311 are in conical surface sealing, and / or the pilot spool 13 and the pilot valve port 331 are in conical surface sealing. Compared with the relief spool 33 and the relief valve port 311 being in flat sealing and / or the pilot spool 13 and the pilot valve port 331 being in flat sealing, the length of the sealing surface is smaller, which can reduce the possibility and range of the fluid forming a laminar flow when flowing through the relief valve port 311 and / or the pilot valve port 331, so that the throttling effect is basically not affected by the fluid viscosity, i.e., the sensitivity of the throttling effect to temperature is reduced, and the high-low temperature performance of the shock absorber 2100 can be optimized, thereby ensuring the shock absorption effect of the shock absorber 2100.

[0070] The pilot relief valve 1000 will be further described below in conjunction with the accompanying drawings.

[0071] In some embodiments, wherein L is the length of the sealing surface between the relief spool 33 and the relief valve port 311, or between the pilot spool 13 and the pilot valve port 331, in the flow direction of the fluid; δ maxis the maximum opening of the relief valve spool 33; and the maximum opening of the pilot valve spool 13 is the maximum size of the gap between the pilot valve spool 13 and the pilot valve port 331 when the pilot valve port 331 is opened by the pilot valve spool 13.

[0072] Specifically, in the case that the relief valve spool 33 and the relief valve port 311 are in a conical surface sealing, In this case, L is the length of the sealing surface between the relief valve spool 33 and the relief valve port 311 in the flow direction of the fluid, and δ max is the maximum opening of the relief valve spool 33; and the maximum opening of the pilot valve spool 13 is the maximum size of the gap between the pilot valve spool 13 and the pilot valve port 331 when the pilot valve port 331 is opened by the pilot valve spool 13. In this case, L is the length of the sealing surface between the relief valve spool 33 and the relief valve port 311 in the flow direction of the fluid, and δ max is the maximum opening of the relief valve spool 33; and the maximum opening of the pilot valve spool 13 is the maximum size of the gap between the pilot valve spool 13 and the pilot valve port 331 when the pilot valve port 331 is opened by the pilot valve spool 13. For ease of illustration, the following embodiments are described by way of example with the relief valve spool 33 and the relief valve port 311 being in a conical surface sealing, and the pilot valve spool 13 and the pilot valve port 331 being in a conical surface sealing.

[0073] wherein the relief valve spool 33 and the relief valve port 311 are in a conical surface sealing; and the pilot valve spool 13 and the pilot valve port 331 are in a conical surface sealing, and Thus, the possibility and range of the formation of laminar flow of the fluid when flowing through the relief valve port 311 and the pilot valve port 331 can be reduced, so that the throttling effect can be substantially unaffected by the viscosity of the fluid, i.e. the sensitivity of the throttling effect to temperature is reduced, and thus the high and low temperature performance of the damper 2100 can be optimized, and the damping effect of the damper 2100 can be ensured.

[0074] Please refer to Figure 3 to Figure 5 In some embodiments, the included angle θ between the first conical surface 131 and the radial direction (perpendicular to the axial direction X1 of the pilot valve spool 13) of the pilot valve spool 13 is greater than or equal to 30°. Thus, when the fluid flows through the gap between the pilot valve spool 13 and the pilot valve port 331, the outflow of the pilot valve port 331 is in an expanding pattern, so that the range of the formation of laminar flow can be further reduced, and the throttling effect can be reduced or even avoided from being affected by the viscosity of the fluid, i.e. the sensitivity of the throttling effect to temperature is reduced, and the high and low temperature performance of the pilot relief valve 1000 and the damper 2100 can be optimized.

[0075] It is to be noted that in some embodiments, the angle θ between the second taper surface 333 and the radial direction of the spill valve spool 33 (perpendicular to the axial direction X2 of the spill valve spool 33) can be any one value or any value between any two values of 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, and 70°, etc. greater than or equal to 30°.

[0076] In some embodiments, the angle θ between the second taper surface 333 and the radial direction of the spill valve spool 33 (perpendicular to the axial direction X2 of the spill valve spool 33) is greater than or equal to 30°, and the radial direction of the pilot valve spool 13 is the same as the radial direction of the spill valve spool 33. Thus, when the fluid flows through the gap between the spill valve spool 33 and the spill valve port 311, the outflow of the spill valve port 311 is in an expanding pattern, so as to further reduce the range of laminar flow formation, reduce or even avoid the influence of the throttling effect on the fluid viscosity, i.e., reduce the sensitivity of the throttling effect to temperature, optimize the high and low temperature performance of the pilot spill valve 1000 and the shock absorber 2100.

[0077] It is to be noted that in some embodiments, the angle θ between the second taper surface 333 and the radial direction of the spill valve spool 33 (perpendicular to the axial direction X2 of the spill valve spool 33) can be any one value or any value between any two values of 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, and 70°, etc. greater than or equal to 30°.

[0078] Please refer to Figure 4 In some embodiments, the pilot valve spool 13 includes a first end surface 133 on the axial direction X1 of the pilot valve spool 13 (i.e., the end surface of the first end of the pilot valve spool 13), and the connection between the first end surface 133 and the first taper surface 131 is a circular arc surface. Thus, compared with the case where the connection between the first end surface 133 and the first taper surface 131 is an angular structure, the connection between the first end surface 133 and the first taper surface 131 being a circular arc surface can reduce the resistance of the fluid flowing at the pilot valve port 331, so that the fluid flowing out of the pilot valve port 331 is more stable and smooth, avoiding structural vibration and unstable flow caused by unstable fluid flow, so as to ensure the stability and reliability of the pilot spill valve 1000.

[0079] Please refer to Figure 5In some embodiments, the spool 33 includes a second end surface 335 on the axial direction X2 of the spool 33 (i.e. the end surface of the first end of the spool 33), and the junction between the second end surface 335 and the second tapered surface 333 is a rounded surface. The axial direction X1 of the pilot spool 13 is the same as the axial direction X2 of the spool 33. Thus, compared to the case where the junction between the second end surface 335 and the second tapered surface 333 is an angular structure, the junction between the second end surface 335 and the second tapered surface 333 being a rounded surface can reduce the resistance to the flow of fluid at the spill port 311, so that the fluid flows out of the spill port 311 more smoothly, avoiding unstable fluid flow and structural vibration and unstable flow, thereby ensuring the stability and reliability of the pilot spill valve 1000.

[0080] In some embodiments, δ max ≤ 0.3 mm. Thus, δ max being too large can reduce the damping force generated by the shock absorber 2100, so that the shock absorber 2100 can effectively offset or weaken the impact force received by the vehicle 6000, improving the stability and ride comfort of the vehicle 6000. It should be understood that δ max ≤ 0.3 mm in the present embodiment can be: the tapered surface sealing between the spool 33 and the spill port 311, and , the maximum opening δ max of the spool 33 is ≤ 0.3 mm; the tapered surface sealing between the pilot spool 13 and the pilot port 331, and , the maximum opening δ max of the pilot spool 13 is ≤ 0.3 mm.

[0081] It should be noted that, in some embodiments, δ max may be 0.3 mm, 0.27 mm, 0.25 mm, 0.23 mm, 0.20 mm, 0.17 mm, 0.15 mm, 0.13 mm, 0.10 mm, 0.05 mm, or 0.03 mm, or any value less than or equal to 0.3 mm or any value between any two values less than or equal to 0.3 mm.

[0082] Please refer to Figure 3 In some embodiments, the spool 33 is provided with a through hole 337 for the fluid at the spill port 311 to flow into the accommodation cavity 103. It should be noted that, in some embodiments, the through hole 337 includes at least one. In the case where the through hole 337 includes multiple through holes 337, the multiple through holes 337 can be uniformly arranged on the spool 33, thereby ensuring the uniformity of the fluid flowing into the accommodation cavity 103.

[0083] In some embodiments, the valve body 111 is provided with a through hole 1111, through which the fluid flows out of the accommodating cavity 101. It should be noted that in some embodiments, the through hole 1111 includes at least one. In the case where the through hole 1111 includes a plurality of through holes 1111, the plurality of through holes 1111 can be uniformly arranged on the valve body 111, so as to ensure the uniformity of the fluid flowing out of the accommodating cavity 101.

[0084] For example, the working principle of the pilot overflow valve 1000 can be as follows: in the initial state, the fluid can flow into the accommodating cavity 103 through the through hole 337 and contact the pilot valve core 13 through the pilot valve port 331; in the case where the pressure of the fluid in the accommodating cavity 103 on the pilot valve core 13 is sufficient to push away the pilot valve core 13, the fluid can flow into the accommodating cavity 101 through the pilot valve port 331 and flow out of the accommodating cavity 101 (for example, an external liquid storage cavity or an oil tank) through the through hole 1111; at this time, due to the throttling effect of the through hole 337, a pressure difference is formed above and below the overflow valve core 33, that is, a pressure difference is formed between the accommodating cavity 103 and the overflow valve port 311, and the overflow valve core 33 can move and open the overflow valve port 311 under the action of the pressure difference, and the fluid flows out of the external (for example, an external liquid storage cavity or an oil tank) through the overflow valve port 311, the opening between the pilot valve seat 113 and the overflow valve seat 31, and the like, thereby enabling the pilot overflow valve 1000 to achieve the functions of overflow and pressure stabilization.

[0085] For further details, please refer to Figure 3 In some embodiments, the pilot overflow valve 1000 further includes a first elastic member 50 and a second elastic member 70. The first elastic member 50 is arranged between the pilot valve core 13 and the valve body 111, and is used to keep the pilot valve core 13 in cooperation with the pilot valve port 331. The second elastic member 70 is arranged between the overflow valve core 33 and the pilot valve seat 113, and is used to keep the overflow valve core 33 in cooperation with the overflow valve port 311.

[0086] Specifically, in some embodiments, in the case where the pressure of the fluid in the accommodating cavity 103 on the pilot valve core 13 is greater than the elastic force of the first elastic member 50 on the pilot valve core 13, the pilot valve core 13 can move relative to the valve body 111 to open the pilot valve port 331, so as to enable the fluid to flow into the accommodating cavity 101; in the case where the force of the pressure difference between the accommodating cavity 103 and the overflow valve port 311 on the overflow valve core 33 is greater than the elastic force of the second elastic member 70 on the overflow valve core 33, the overflow valve core 33 can move relative to the overflow valve seat 31 to open the overflow valve port 311. It should be noted that in some embodiments, the first elastic member 50 and the second elastic member 70 include but are not limited to compression springs, tension springs or torsion springs, etc.

[0087] For example, the first elastic member 50 can be a compression spring, and the first elastic member 50 is sleeved on the pilot spool 13 and extends along the axial direction X1 of the pilot spool 13. In this way, the pilot spool 13 can guide and limit the expansion and contraction of the first elastic member 50, so as to prevent the first elastic member 50 from being deflected during the expansion and contraction process and affecting the stability of the movement of the pilot spool 13, thereby ensuring the normal operation of the pilot overflow valve 1000. Similarly, the second elastic member 70 can be a compression spring, and the second elastic member 70 is sleeved on the overflow spool 33 and extends along the axial direction X2 of the overflow spool 33. In this way, the overflow spool 33 can guide and limit the expansion and contraction of the second elastic member 70, so as to prevent the second elastic member 70 from being deflected during the expansion and contraction process and affecting the stability of the movement of the overflow spool 33, thereby ensuring the normal operation of the pilot overflow valve 1000.

[0088] In some embodiments, the pilot overflow valve 1000 further comprises a sealing member 80 arranged between the overflow spool 33 and the side wall of the accommodating cavity 103, and the sealing member 80 is used to seal the gap between the overflow spool 33 and the side wall of the accommodating cavity 103. The arrangement of the sealing member 80 can prevent the fluid in the accommodating cavity 103 from leaking through the gap between the overflow spool 33 and the side wall of the accommodating cavity 103, thereby ensuring that a pressure difference can be formed between the overflow valve port 311 and the accommodating cavity 101, and further ensuring the stability and reliability of the operation of the pilot overflow valve 1000.

[0089] It should be noted that, in some embodiments, the material of the sealing member 80 includes but is not limited to silica gel, rubber, or plastic. In some embodiments of the present application, the sealing member 80 can be an open ring.

[0090] In some embodiments, the valve body 111 is provided with a mounting hole 1113, and the pilot overflow valve 1000 further comprises a guide sleeve 90, at least a portion of the guide sleeve 90 is arranged in the mounting hole 1113, and the pilot spool 13 is movably fitted in the guide sleeve 90. In this way, the arrangement of the guide sleeve 90 can guide and constrain the movement of the pilot spool 13, so as to prevent the pilot spool 13 from being deflected during the movement relative to the main body 11, thereby improving the stability and reliability of the operation of the pilot overflow valve 1000. It can be understood that the guide sleeve 90 can be arranged in the mounting hole 1113 in an interference fit manner, thereby ensuring the stability of the installation of the guide sleeve 90.

[0091] Any technical features in the above-described embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations are described, however, as long as there is no conflict in combining the technical features, it should be considered that the combination of the technical features is within the scope of the present disclosure. Meanwhile, other embodiments can be derived from the above-described embodiments, so that structural and logical substitutions and changes can be made without departing from the scope of the present disclosure.

[0092] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A pilot-operated relief valve (1000), characterized in that: include: A pilot valve (10), the pilot valve (10) comprising a pilot valve core (13); and A relief valve (30) is provided, wherein the relief valve (30) comprises a relief valve seat (31) and a relief valve core (33); the relief valve seat (31) is provided with a relief valve port (311); the relief valve core (33) is provided with a pilot valve port (331); a conical seal is formed between the relief valve core (33) and the relief valve port (311); and / or a conical seal is formed between the pilot valve core (13) and the pilot valve port (331).

2. The pilot-operated relief valve (1000) according to claim 1, characterized in that: Wherein, L is the sealing surface length between the overflow valve core (33) and the overflow valve port (311), or between the pilot valve core (13) and the pilot valve port (331) in the flow direction of the fluid; δ max It is the maximum opening of the overflow valve core (33) or the pilot valve core (13).

3. The pilot-operated relief valve (1000) according to claim 2, characterized in that: δ max ≤0.3mm。 4. The pilot-operated relief valve (1000) according to claim 1, characterized in that: The pilot valve core (13) is provided with a first conical surface (131), and the first conical surface (131) is used to form a conical surface sealing fit with the pilot valve port (331), and the angle between the first conical surface (131) and the radial direction of the pilot valve core (13) is greater than or equal to 30°.

5. The pilot-operated relief valve (1000) according to claim 4, characterized in that: The pilot valve core (13) comprises a first end surface (133) in the axial direction of the pilot valve core (13), and a connection between the first end surface (133) and the first conical surface (131) is an arc surface.

6. The pilot-operated relief valve (1000) according to claim 1, characterized in that: The overflow valve core (33) is provided with a second conical surface (333), and the second conical surface (333) is used to form a conical surface sealing fit with the overflow valve port (311). The angle between the second conical surface (333) and the radial direction of the overflow valve core (33) is greater than or equal to 30°, and the radial direction of the pilot valve core (13) is the same as the radial direction of the overflow valve core (33).

7. The pilot-operated relief valve (1000) according to claim 6, characterized in that: The overflow valve core (33) includes a second end surface (335) in the axial direction of the overflow valve core (33), the connection between the second end surface (335) and the second conical surface (333) is an arc surface, and the axial direction of the pilot valve core (13) is the same as the axial direction of the overflow valve core (33).

8. The pilot-operated relief valve (1000) according to any one of claims 1 to 7, characterized in that: The pilot valve (10) further comprises a main body (11), the main body (11) being provided with a spaced accommodating chamber (101) and an accommodating chamber (103), at least a portion of the pilot valve core (13) being movably disposed in the accommodating chamber (101), the overflow valve seat (31) being engaged with the main body (11), the pilot valve port (331) being communicated with the accommodating chamber (103), and at least a portion of the overflow valve core (33) being movably disposed in the accommodating chamber (103).

9. The pilot-operated relief valve (1000) according to claim 8, characterized in that: The main body (11) includes a valve body (111) and a pilot valve seat (113). The valve body (111) and the pilot valve seat (113) are connected and together form the accommodating chamber (101). The accommodating chamber (103) is provided on the pilot valve seat (113). One end of the overflow valve core (33) is passed through the pilot valve seat (113), and the other end of the overflow valve core (33) cooperates with the overflow valve port (311).

10. The pilot-operated relief valve (1000) according to claim 9, characterized in that: The overflow valve core (33) is provided with a through hole (337), and the through hole (337) is used to allow the fluid at the overflow valve port (311) to flow into the accommodating chamber (103); and / or, The valve body (111) is provided with a through hole (1111), and the fluid flows out of the accommodating cavity (101) through the through hole (1111).

11. The pilot-operated relief valve (1000) according to claim 9, characterized in that: The pilot-operated relief valve (1000) further comprises: a first elastic member (50), the first elastic member (50) being disposed between the pilot valve core (13) and the valve body (111), the first elastic member (50) being used to keep the pilot valve core (13) and the pilot valve port (331) in engagement; and A second elastic member (70) is provided between the overflow valve core (33) and the pilot valve seat (113), and the second elastic member (70) is used to keep the overflow valve core (33) and the overflow valve port (311) in alignment.

12. The pilot-operated relief valve (1000) according to claim 9, characterized in that: The pilot-operated relief valve (1000) further comprises: A sealing member (80) is provided between the overflow valve core (33) and the side wall of the accommodating chamber (103), and the sealing member (80) is used to seal the gap between the overflow valve core (33) and the side wall of the accommodating chamber (103).

13. The pilot-operated relief valve (1000) according to claim 9, characterized in that: The valve body (111) is provided with a mounting hole (1113); the pilot-operated relief valve (1000) further comprises: A guide sleeve (90), at least a portion of which is disposed in the mounting hole (1113), and the pilot valve core (13) is movably engaged with the guide sleeve (90).

14. A vibration absorber (2100), characterized in that: include: The pilot-operated relief valve (1000) according to any one of claims 1 to 13.

15. A suspension system (5000), characterized in that: include: The vibration absorber (2100) according to claim 14.

16. A vehicle (6000), characterized in that include: The suspension system (5000) of claim 15.

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