Variable damping valve group, variable damping suspension and dumper

Abstract

The invention relates to the technical field of hydro-pneumatic suspensions, in particular to a variable damping valve bank, a variable damping suspension and a dumper. The variable damping valve bank is characterized in that a plurality of one-way valves connected in parallel are arranged on a first branch; a plurality of fixed damping valves connected in parallel are arranged on the second branch; the third branch is provided with a plurality of damping one-way valves connected in parallel, and the damping one-way valves are used for controlling one-way circulation of the oil from the liquid inlet to the liquid return opening through the third branch when preset pressure is reached and generating second damping force when the oil circulates. By connecting the damping one-way valves in parallel and matching with the fixed damping valves, when the movement speed of the suspension is high, different levels of pressure can be generated, so that the damping one-way valves are opened step by step, and variable damping force is provided for the suspension; when the movement speed of the suspension is low, the fixed damping valve can provide fixed damping force, and it is guaranteed that when the suspension is low in speed, relatively large damping force is obtained.

Description

Technical Field

[0001] The present application relates to the technical field of oil-gas suspension, and in particular to a variable damping valve group, a variable damping suspension and a dump truck. Background Art

[0002] The suspension system is the general term for the force-transmitting connection device between the frame and wheels of a car. It is mainly responsible for transmitting the forces and torques acting between the wheels and the frame, cushioning the impact forces transmitted to the frame or body by uneven roads, and attenuating the vibrations caused thereby, to ensure smooth driving of the car.

[0003] Hydro-pneumatic suspension is an advanced automobile suspension system that combines the properties of gas and liquid to provide excellent shock absorption and suspension performance. During vehicle driving, the hydro-pneumatic suspension, through the combined action of the accumulator and the oil shock absorber, mitigates the impact of the ground and attenuates the vibration of the vehicle, thereby improving the smoothness of the vehicle's driving, improving the safety of the vehicle's operation, and enhancing the comfort of the vehicle's ride.

[0004] However, the different operating frequencies and extension and retraction speeds of traditional oil-gas suspensions make the vibration reduction characteristics of traditional oil-gas suspensions not ideal at different speeds, and there are technical problems such as poor low-speed comfort and poor high-speed handling stability. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems of the traditional oil-gas suspension, namely, poor low-speed comfort and poor high-speed handling stability.

[0006] To this end, the present application provides a variable damping valve group, which, through a damping one-way valve in parallel and in combination with a fixed damping valve, can generate different levels of pressure when the suspension moves at a faster speed, thereby opening the damping one-way valve step by step to provide the suspension with variable damping force, increase the suspension rebound response speed, and improve high-speed handling stability; when the suspension moves at a slower speed, the fixed damping valve can provide a fixed damping force to ensure that a relatively large damping force is obtained when the suspension moves at a low speed, which can effectively attenuate vibration and improve low-speed comfort.

[0007] The present application also provides a variable damping suspension including the variable damping valve group, and a dump truck including the variable damping suspension.

[0008] A variable damping valve group provided in accordance with an embodiment of the first aspect of the present application includes: a valve body, on which a plurality of liquid inlets and liquid return ports are provided; the liquid inlet and the liquid return port are connected via a plurality of parallel branches; a plurality of parallel one-way valves are provided on the first branch, the one-way valves being used to control the one-way flow of oil from the liquid return port to the liquid inlet via the first branch; a plurality of parallel fixed damping valves are provided on the second branch, the fixed damping valves being used to control the two-way flow of oil from the liquid inlet via the second branch to the liquid return port, and generating a first damping force when the oil flows; a plurality of parallel damping one-way valves are provided on the third branch, the damping one-way valves being used to control the one-way flow of oil from the liquid inlet via the third branch to the liquid return port when a preset pressure is reached, and generating a second damping force when the oil flows.

[0009] Optionally, the one-way valve includes: a first cavity and a small ball, the first cavity is connected to the oil channel through the valve port, the first cavity and the oil channel form a first branch; the small ball is arranged in the first cavity, and the small ball is used to open or close the valve port.

[0010] Optionally, the fixed damping valve includes a first damping hole, the first damping hole is connected to the oil channel, the first damping hole and the oil channel form a second branch, and a damping plug is provided in the first damping hole.

[0011] Optionally, the damping one-way valve includes: a second cavity, the second cavity is connected to the second damping hole and the oil channel, the second cavity, the second damping hole and the oil channel constitute a third branch; a valve core is provided in the second cavity, and the valve core is elastically blocked on the second damping hole by a spring.

[0012] Optionally, a gasket is provided between the valve core and the spring.

[0013] Optionally, the oil passage is arranged in the middle of the valve body, the damping one-way valve is arranged around the oil passage, and the one-way valve and the fixed damping valve are arranged on the side wall of the valve body.

[0014] A variable damping suspension provided in an embodiment of the second aspect of the present application includes: a cylinder body, a piston is arranged in the cylinder body; the piston divides the cylinder body into a rod chamber and a rodless chamber; the piston is provided with a variable damping valve group provided in the first aspect or its various implementation methods, the liquid inlet of the variable damping valve group is connected to the rod chamber, and the liquid return port of the variable damping valve group is connected to the rodless chamber.

[0015] Optionally, the piston includes a piston head and a piston rod, and the piston head is connected to the piston rod; an oil chamber is provided in the piston rod, and an oil hole is provided on the side wall of the piston rod, and the oil hole is used to connect the oil chamber and the rod chamber; the variable damping valve group is arranged at the top of the oil chamber, the liquid inlet of the variable damping valve group is connected to the oil chamber, and the liquid return port of the variable damping valve group is connected to the rodless chamber.

[0016] Optionally, a third damping hole is provided on the piston rod, the third damping hole is located between the oil hole and the piston head, and the diameter of the third damping hole is smaller than the diameter of the oil hole.

[0017] A dump truck provided in an embodiment of the third aspect of the present application comprises a variable damping suspension in the second aspect or its various implementations.

[0018] One of the above technical solutions has at least the following advantages or beneficial effects:

[0019] A variable damping valve group provided in an embodiment of the present application includes: a valve body, on which are provided a plurality of liquid inlets and liquid return ports; the liquid inlet and the liquid return port are connected via a plurality of parallel branches; a plurality of parallel one-way valves are provided on the first branch, the one-way valves are used to control the one-way flow of oil from the liquid return port to the liquid inlet via the first branch; a plurality of parallel fixed damping valves are provided on the second branch, the fixed damping valves are used to control the two-way flow of oil from the liquid inlet via the second branch to the liquid return port, and a first damping force is generated when the oil flows; a plurality of parallel damping one-way valves are provided on the third branch, the damping one-way valves are used to control the one-way flow of oil from the liquid inlet via the third branch to the liquid return port when a preset pressure is reached, and a second damping force is generated when the oil flows. By connecting the damping one-way valve in parallel and matching it with a fixed damping valve, different levels of pressure can be generated when the suspension moves at a faster speed, thereby opening the damping one-way valve step by step to provide the suspension with variable damping force, increase the suspension rebound response speed, and improve high-speed handling stability; when the suspension moves at a slower speed, the fixed damping valve can provide a fixed damping force to ensure that the suspension obtains a relatively large damping force at low speeds, which can effectively attenuate vibrations and improve low-speed comfort.

[0020] The variable damping suspension provided in the embodiment of the present application is provided with the above-mentioned variable damping valve group. Since the variable damping valve group has the above-mentioned technical effects, the variable damping suspension provided with the variable damping valve group should also have corresponding technical effects.

[0021] The dump truck provided in the embodiment of the present application is provided with the above-mentioned variable damping suspension. Since the variable damping valve group has the above-mentioned technical effects, the dump truck provided with the variable damping valve group should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 A schematic diagram showing the principle of a variable damping valve group provided in an embodiment of the present application is shown;

[0024] Figure 2 A front view of a variable damping valve group provided in an embodiment of the present application is shown;

[0025] Figure 3A top view of a variable damping valve group provided in an embodiment of the present application is shown;

[0026] Figure 4 The embodiment of the present application provides Figure 3 Sectional view along line AA;

[0027] Figure 5 A schematic structural diagram of a variable damping suspension provided in an embodiment of the present application is shown.

[0028] Description of reference numerals:

[0029] 1. Cylinder body, 11. Rod chamber, 12. Rodless chamber, 2. Piston, 21. Piston head, 22. Piston rod, 221. Oil chamber, 222. Oil hole, 223. Third damping hole, 3. Guide sleeve, 4. Variable damping valve, 41. Valve body, 42. Oil channel, 43. Check valve, 431. First chamber, 432. Small ball, 44. Fixed damping valve, 441. First damping hole, 45. Damping check valve, 451. Second chamber, 452. Valve core, 453. Spring, 454. Second damping hole, 455. Gasket. DETAILED DESCRIPTION

[0030] In order to better explain the present application and facilitate understanding, the present application is described in detail below in conjunction with the accompanying drawings through specific implementation methods. Figure 5 The position of the rodless chamber 12 relative to the rod chamber 11 is defined as "upper", and the position of the piston 2 relative to the cylinder body 1 is defined as "inner".

[0031] As mentioned above, a dump truck is a vehicle that tilts or rolls over the vehicle body through hydraulic or mechanical lifting mechanisms, so that the cargo loaded on it can be unloaded by its own gravity. This type of vehicle is widely used in material transportation and loading and unloading scenarios such as mines, construction sites, water conservancy projects, and docks, and has the advantages of high efficiency, speed, and economy.

[0032] Dump trucks usually travel on complex and changeable road conditions, such as unpaved dirt roads, rugged mountain roads, narrow construction site roads, etc. Moreover, dump trucks are mainly used to transport heavy materials, such as sand, coal, ore, etc., so the vehicles are often in a heavy or even overloaded state, which can cause sudden changes in the operating frequency and extension speed of the vehicle's suspension system.

[0033] Due to the different working frequencies and telescopic speeds of the oil-gas suspension, the vibration reduction characteristics of the oil-gas suspension are not ideal at different speeds. The traditional oil-gas suspension has the following shortcomings:

[0034] (1) Poor comfort at low speeds: When the vehicle is on a relatively flat road or driving at low speeds, the suspension movement speed is low and the damping force is too small, which cannot effectively attenuate vibrations and results in a bumpy ride.

[0035] (2) Poor high-speed handling stability: When the vehicle is driving on a severely bumpy road or at high speed, the suspension moves at a high speed, the damping force is too large, the suspension rebound response is slow, and the tires lose weight and become airborne due to excessive dynamic load, resulting in poor handling stability.

[0036] In order to solve at least one of the technical problems existing in the prior art or related technology, the present application provides a variable damping valve group, a variable damping suspension and a dump truck, the variable damping valve group comprising: a valve body, a plurality of liquid inlets and liquid return ports are provided on the valve body; the liquid inlet and the liquid return port are connected through a plurality of parallel branches; a plurality of parallel one-way valves are provided on the first branch, the one-way valves are used to control the one-way flow of oil from the liquid return port to the liquid inlet through the first branch; a plurality of parallel fixed damping valves are provided on the second branch, the fixed damping valves are used to control the two-way flow of oil from the liquid inlet through the second branch to the liquid return port, and generate a first damping force when the oil flows; a plurality of parallel damping one-way valves are provided on the third branch, the damping one-way valves are used to control the one-way flow of oil from the liquid inlet through the third branch to the liquid return port when a preset pressure is reached, and generate a second damping force when the oil flows. By connecting the damping one-way valve in parallel and matching it with a fixed damping valve, different levels of pressure can be generated when the suspension moves at a faster speed, thereby opening the damping one-way valve step by step to provide the suspension with variable damping force, increase the suspension rebound response speed, and improve high-speed handling stability; when the suspension moves at a slower speed, the fixed damping valve can provide a fixed damping force to ensure that the suspension obtains a relatively large damping force at low speeds, which can effectively attenuate vibrations and improve low-speed comfort.

[0037] The variable damping valve groups according to some embodiments provided by the present application are described below with reference to the accompanying drawings.

[0038] See also Figures 1 to 5 A variable damping valve group provided in an embodiment of the first aspect of the present application includes: a valve body 41, on which a plurality of liquid inlets and liquid return ports are provided; the liquid inlet and the liquid return port are connected through a plurality of parallel branches; a plurality of parallel one-way valves 43 are provided on the first branch, and the one-way valve 43 is used to control the one-way flow of oil from the liquid return port to the liquid inlet through the first branch; a plurality of parallel fixed damping valves 44 are provided on the second branch, and the fixed damping valve 44 is used to control the two-way flow of oil from the liquid inlet through the second branch to the liquid return port, and generate a first damping force when the oil flows; a plurality of parallel damping one-way valves 45 are provided on the third branch, and the damping one-way valve 45 is used to control the one-way flow of oil from the liquid inlet through the third branch to the liquid return port when a preset pressure is reached, and generate a second damping force when the oil flows.

[0039] like Figure 1As shown, the variable damping valve group 4 is used to control the oil flow between the rod chamber 11 and the rodless chamber 12 in the variable damping suspension. The liquid inlet of the variable damping valve group 4 is connected to the rod chamber 11, and the liquid return port of the variable damping valve group 4 is connected to the rodless chamber 12, that is, the oil in the rod chamber 11 needs to flow into the rod chamber 11 from the liquid inlet of the variable damping valve group 4 and flow out from the liquid return port of the variable damping valve group 4 before it can flow into the rodless chamber 12; and the oil in the rodless chamber 12 needs to flow into the rod chamber 11 from the liquid return port of the variable damping valve group 4 and flow out from the liquid inlet of the variable damping valve group 4 before it can flow into the rod chamber 11.

[0040] When the variable damping suspension is working, when the piston 2 is pulled out of the cylinder body 1, the oil in the rod chamber 11 needs to flow through the variable damping valve group 4 to the rodless chamber 12 to complete the pulling action; when the piston 2 is retracted into the cylinder body 1, the oil in the rodless chamber 12 needs to flow through the variable damping valve group 4 to the rod chamber 11 to complete the retraction action.

[0041] Specifically, when the piston 2 is pulled out of the cylinder body 1, the oil in the rod chamber 11 needs to flow into the liquid inlet of the variable damping valve group 4, and flow to the return liquid port through multiple parallel branches, wherein a first branch is provided with a plurality of parallel one-way valves 43. Since the one-way valve 43 can only allow the oil to flow from the return liquid port to the liquid inlet in one direction, that is, the one-way valve 43 is in a closed state, the oil in the first branch cannot pass; a second branch is provided with a plurality of parallel fixed damping valves 44. Since the fixed damping valve 44 is a bidirectional The third branch is provided with a plurality of parallel damping check valves 45, which can be opened according to the preset pressure to make the oil flow from the liquid inlet to the liquid return port in one direction, that is, when the preset pressure is reached, the damping check valve 45 is in an open state, so the oil in the third branch can flow, and at the same time, the oil generates a second damping force when passing through the damping check valve 45. When the piston 2 retracts into the cylinder body 1, the oil in the rodless chamber 12 needs to flow in through the liquid return port of the variable damping valve group 4, and flows to the liquid inlet through a plurality of parallel branches, wherein the check valve 43 on the first branch is opened, and the oil in the first branch can flow; the fixed damping valve 44 on the second branch is bidirectionally circulated, and the oil in the second branch can flow; the damping check valve 45 on the third branch is closed, and the oil in the third branch cannot flow.

[0042] When the suspension is working, the piston 2 reciprocates in the cylinder 1. When the piston 2 retracts into the cylinder 1, the one-way valve 43 opens, and the oil circulation does not generate damping force; when the piston 2 is pulled out of the cylinder 1, the one-way valve 43 closes, and the oil circulation generates damping force. When the suspension is running at a low speed, the oil pressure in the suspension cannot reach the opening threshold of the damping one-way valve 45, and the oil only passes through the fixed damping valve 44, so a relatively large fixed damping force can be obtained. By setting the fixed damping valves 44 in parallel, the fixed damping force can be adjusted. For example, when one fixed damping valve 44 is set, the oil can only pass through one fixed damping valve 44, and the fixed damping force is the first damping force of the fixed damping valve 44; when multiple fixed damping valves 44 are set in parallel, the oil can flow through the multiple fixed damping valves 44 at the same time, which is equivalent to increasing the flow area of ​​the oil. According to the principles of fluid mechanics, the increase in the flow area will lead to a decrease in the resistance of the fluid when it passes through. Therefore, connecting multiple fixed damping valves 44 in parallel can reduce the fixed damping force.

[0043] When the suspension runs at high speed, the oil pressure in the suspension will reach the opening threshold of the damping check valve 45. At this time, the oil can pass through the fixed damping valve 44 and the damping check valve 45 at the same time, which is equivalent to increasing the flow area of ​​the oil. Therefore, when the damping check valve 45 is opened, the fixed damping force can be reduced. By setting a plurality of damping one-way valves 45 in parallel and setting the opening pressure of the damping one-way valves 45 in a graded manner, the damping force at different operating speeds can be adjusted. For example, three damping one-way valves 45 are set in parallel, and the opening threshold of the first damping one-way valve is set in the low-speed stage, such as when the suspension operating speed is 0.2mm / s, the oil pressure is used as the opening threshold of the low-speed stage; the opening threshold of the second damping one-way valve is set in the medium-speed stage, such as when the suspension operating speed is 0.4mm / s, the oil pressure is used as the opening threshold of the medium-speed stage; the opening threshold of the third damping one-way valve is set in the high-speed stage, such as when the suspension operating speed is 0.8mm / s, the oil pressure is used as the opening threshold of the high-speed stage. Then, when the suspension operating speed is in the low-speed stage, such as when the suspension operating speed is 0.3mm / s, the oil pressure can open the first damping one-way valve, but cannot open the second damping one-way valve and the third damping one-way valve, that is, the oil can pass through the fixed damping valve 44 and the first damping one-way valve at the same time. At this time, the oil flow area The first damping check valve will increase due to the opening of the first damping check valve, and the damping force will decrease accordingly. When the suspension speed is in the medium speed stage, such as when the suspension speed is 0.6 mm / s, the oil pressure can open the first damping check valve and the second damping check valve, but cannot open the third damping check valve, that is, the oil can pass through the fixed damping valve 44 and the first damping check valve and the second damping check valve at the same time. At this time, the oil flow area will be further increased due to the opening of the first damping check valve and the second damping check valve, and the damping force will decrease accordingly. The force will decrease accordingly; when the suspension running speed is in the high-speed stage, such as when the suspension running speed is 0.9mm / s, the oil pressure can open the first damping one-way valve, the second damping one-way valve and the third damping one-way valve, that is, the oil can pass through the fixed damping valve 44, the first damping one-way valve, the second damping one-way valve and the third damping one-way valve at the same time. At this time, the oil flow area will be further increased due to the opening of the first damping one-way valve, the second damping one-way valve and the third damping one-way valve, and the damping force will decrease accordingly.

[0044] It can be understood that multiple damping check valves 45 for different speed stages can be set in parallel to achieve the effect of adjusting the damping curves of different speed stages. For example, multiple first damping check valves in the low-speed stage can be set in parallel to achieve the effect of adjusting the damping curve in the low-speed stage; similarly, multiple second damping check valves in the medium-speed stage can be set in parallel, or multiple third damping check valves in the high-speed stage can be set in parallel, or the speed stage can be graded more, etc., which will not be repeated here.

[0045] This arrangement can conveniently adjust the speed and damping curve of the suspension, so that when the suspension moves at a slow speed, the fixed damping valve 44 can provide a fixed damping force to ensure that a relatively large damping force is obtained when the suspension moves at a low speed, which can effectively attenuate vibration and improve low-speed comfort; when the suspension moves at a fast speed, the damping one-way valve 45 provides the suspension with a variable damping force, increases the suspension rebound response speed, and improves high-speed handling stability.

[0046] In an illustrative embodiment, Figure 4 As shown, the one-way valve 43 includes: a first cavity 431 and a small ball 432. The first cavity 431 is connected to the oil channel 42 through the valve port. The first cavity 431 and the oil channel 42 form a first branch. The small ball 432 is arranged in the first cavity 431, and the small ball 432 is used to open or close the valve port.

[0047] The notch at the upper end of the oil passage 42 serves as a liquid return port, and the notch of the first cavity 431 on the cylinder body 1 serves as a liquid inlet. When oil flows in from the liquid return port, the oil reaches the valve port through the oil passage 42, and pushes the ball 432 away from the valve port, so that the valve port is opened, and the oil can flow out of the liquid inlet through the first cavity 431; when oil flows in from the liquid inlet, the oil passes through the first cavity 431, and pushes the ball 432 close to the valve port, so that the valve port is closed, and the oil cannot enter the oil passage 42, thereby achieving the purpose of one-way flow of oil from the liquid return port through the first branch to the liquid inlet.

[0048] In an illustrative embodiment, Figure 2 As shown, the fixed damping valve 44 includes a first damping hole 441 , the first damping hole 441 is connected to the oil passage 42 , the first damping hole 441 and the oil passage 42 form a second branch, and a damping plug is provided in the first damping hole 441 .

[0049] The notch at the upper end of the oil passage 42 serves as a liquid return port, and the notch of the first damping hole 441 on the cylinder body 1 serves as a liquid inlet. When the oil flows into the first damping hole 441, the first damping force is generated through the damping plug, and the oil can flow bidirectionally from the liquid inlet through the second branch to the liquid return port. The first damping force can be adjusted by designing the diameter of the first damping hole 441 and selecting different types of damping plugs.

[0050] In an illustrative embodiment, Figure 4 As shown, the damping one-way valve 45 includes: a second cavity 451, the second cavity 451 is connected to the second damping hole 454 and the oil channel 42, and the second cavity 451, the second damping hole 454 and the oil channel 42 form a third branch; a valve core 452 is provided in the second cavity 451, and the valve core 452 is elastically blocked on the second damping hole 454 by a spring 453.

[0051] The notch at the upper end of the oil passage 42 serves as a liquid return port, and the notch of the second damping hole 454 on the cylinder body 1 serves as a liquid inlet. When the oil flows into the liquid return port, the oil reaches the second cavity 451 through the oil passage 42. Since the valve core 452 is elastically blocked on the second damping hole 454 by the spring 453, the oil cannot pass through the second damping hole 454. Therefore, the oil cannot reach the liquid inlet from the liquid return port; when the oil flows in from the liquid inlet, the pressure of the oil reaches the condition that the valve core 452 can be pushed open, that is, the pressure of the oil reaches the opening threshold, the oil can flow to the second cavity 451 and reach the liquid return port through the oil passage 42, thereby achieving the purpose of one-way flow of the oil from the liquid inlet through the third branch to the liquid return port, and generating a second damping force when the oil circulates.

[0052] Furthermore, the contact surface between the valve core 452 and the second damping hole 454 is designed to be a conical surface. The contact of the conical surfaces can form a tighter seal. When the oil flows from the bottom of the cone to the cone head, the shape of the conical surface makes it difficult for the oil to pass through, thereby ensuring unidirectional flow. The spring 453 is sleeved on the valve core 452. The spring 453 is in a compressed state, and the valve core 452 is pressed against the second damping hole 454. By adjusting the preload force of the spring 453, the opening threshold can be conveniently designed.

[0053] Furthermore, a gasket 455 is provided between the valve core 452 and the spring 453. The thickness and material of the gasket 455 can affect the pre-tightening force of the spring 453 on the valve core 452. By selecting a suitable gasket 455, the compression amount of the spring 453 can be adjusted, thereby controlling the opening pressure of the valve core 452.

[0054] In an illustrative embodiment, Figure 3 As shown, the oil passage 42 is arranged in the middle of the valve body 41, the damping check valve 45 is arranged around the oil passage 42, and the check valve 43 and the fixed damping valve 44 are arranged on the side wall of the valve body 41. When it is necessary to set a plurality of parallel check valves 43, it is only necessary to open a cavity at the side wall of the lower end of the valve body 41 to connect the middle oil passage 42; similarly, when it is necessary to set a plurality of parallel fixed damping valves 44, it is only necessary to open a through hole at the side wall of the lower end of the valve body 41 to connect the middle oil passage 42; when it is necessary to set a plurality of parallel damping check valves 45, it is only necessary to set a cavity around the oil passage 42. Such a design has a simple and compact structure and is easy to manufacture.

[0055] Based on the variable damping valve group provided in the above embodiment, the second aspect of the present application also provides a variable damping suspension, such as Figure 5 As shown, it includes: a cylinder body 1, a piston 2 is arranged in the cylinder body 1; the piston 2 divides the cylinder body 1 into a rod chamber 11 and a rodless chamber 12; the piston 2 is provided with a variable damping valve group 4 provided in the above embodiment, the liquid inlet of the variable damping valve group 4 is connected to the rod chamber 11, and the liquid return port of the variable damping valve group 4 is connected to the rodless chamber 12.

[0056] Since the variable damping suspension provided in this embodiment has the variable damping valve group provided in any of the above embodiments, the variable damping suspension has all the beneficial effects of the variable damping valve group provided in any of the above embodiments, which will not be described in detail here.

[0057] In an illustrative embodiment, the piston 2 includes a piston head 21 and a piston rod 22, and the piston head 21 is connected to the piston rod 22; an oil chamber 221 is provided in the piston rod 22, and an oil hole 222 is provided on the side wall of the piston rod 22, and the oil hole 222 is used to connect the oil chamber 221 and the rod chamber 11; the variable damping valve group 4 is arranged at the top of the oil chamber 221, the liquid inlet of the variable damping valve group 4 is connected to the oil chamber 221, and the liquid return port of the variable damping valve group 4 is connected to the rodless chamber 12.

[0058] When the piston 2 is retracted into the cylinder body 1, the oil in the rodless chamber 12 flows into the oil chamber 221 through the variable damping valve group 4, and then flows into the rod chamber 11 through the oil hole 222; when the piston 2 is pulled out of the cylinder body 1, the oil in the rod chamber 11 flows into the oil chamber 221 through the oil hole 222, and then flows into the rodless chamber 12 through the variable damping valve group 4. When the piston 2 is pulled out to the limit position, the oil hole 222 will be blocked by the guide sleeve 3 arranged at the lower end of the cylinder body 1, thereby preventing the flow of oil and preventing the piston 2 from being pulled out further.

[0059] In an illustrative embodiment, a third damping hole 223 is provided on the piston rod 22 . The third damping hole 223 is located between the oil hole 222 and the piston head 21 . The diameter of the third damping hole 223 is smaller than the diameter of the oil hole 222 .

[0060] The traditional suspension adopts a nylon anti-collision block at the extreme stretching position of the piston 2 to avoid direct contact between the piston 2 and the guide sleeve 3, but it only reduces the noise and does not avoid the impact; while the present application adopts a gradual throttling method of the damping hole. When the piston 2 approaches the guide sleeve 3, the third damping hole 223 will generate high pressure to slow down the piston rod 22, thereby eliminating noise and impact.

[0061] Based on the variable damping suspension provided in the above embodiment, the third aspect of the present application also provides a dump truck, including the variable damping suspension of the above embodiment. Since the dump truck provided in this embodiment has the variable damping valve group provided in any of the above embodiments, the dump truck has all the beneficial effects of the variable damping valve group provided in any of the above embodiments, which will not be repeated here.

[0062] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0063] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] In the present application, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0065] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "exemplary embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A variable damping valve group, characterized in that: include: A valve body (41), wherein the valve body (41) is provided with a plurality of liquid inlets and liquid return ports; the liquid inlets and the liquid return ports are connected via a plurality of parallel branches; A plurality of parallel one-way valves (43) are provided on the first branch, and the one-way valves (43) are used to control the one-way flow of oil from the liquid return port through the first branch to the liquid inlet; A plurality of parallel fixed damping valves (44) are provided on the second branch, and the fixed damping valves (44) are used to control the bidirectional flow of oil from the liquid inlet through the second branch to the liquid return port, and to generate a first damping force when the oil flows; The third branch is provided with a plurality of parallel damping one-way valves (45), and the damping one-way valves (45) are used to control the one-way flow of oil from the liquid inlet through the third branch to the liquid return port when a preset pressure is reached, and to generate a second damping force when the oil flows.

2. A variable damping valve assembly as claimed in claim 1, characterized in that: The one-way valve (43) comprises: a first cavity (431) and a small ball (432); the first cavity (431) is connected to the oil passage (42) through a valve port; the first cavity (431) and the oil passage (42) form the first branch; The small ball (432) is arranged in the first cavity (431), and the small ball (432) is used to open or close the valve port.

3. A variable damping valve assembly as claimed in claim 1, characterized in that: The fixed damping valve (44) comprises a first damping hole (441), the first damping hole (441) is connected to the oil passage (42), the first damping hole (441) and the oil passage (42) form the second branch, and a damping plug is provided in the first damping hole (441).

4. A variable damping valve assembly as claimed in claim 1, characterized in that: The damping one-way valve (45) comprises: a second cavity (451), the second cavity (451) is in communication with a second damping hole (454) and the oil passage (42), and the second cavity (451), the second damping hole (454) and the oil passage (42) form the third branch; A valve core (452) is provided in the second cavity (451), and the valve core (452) is elastically blocked on the second damping hole (454) by a spring (453).

5. A variable damping valve assembly as claimed in claim 4, characterized in that: A gasket (455) is provided between the valve core (452) and the spring (453).

6. A variable damping valve assembly as claimed in claim 1, characterized in that: The oil passage (42) is arranged at a middle position of the valve body (41), the damping one-way valve (45) is arranged around the oil passage (42), and the one-way valve (43) and the fixed damping valve (44) are arranged on the side wall of the valve body (41).

7. A variable damping suspension, characterized in that: include: A cylinder body (1), wherein a piston (2) is arranged in the cylinder body (1); the piston (2) divides the cylinder body (1) into a rod chamber (11) and a rodless chamber (12); The piston (2) is provided with a variable damping valve group (4) as described in any one of claims 1 to 6, the liquid inlet of the variable damping valve group (4) is connected to the rod chamber (11), and the liquid return port of the variable damping valve group (4) is connected to the rodless chamber (12).

8. A variable damping suspension as claimed in claim 7, characterized in that: The piston (2) comprises a piston head (21) and a piston rod (22), and the piston head (21) is connected to the piston rod (22); An oil chamber (221) is provided in the piston rod (22), and an oil hole (222) is provided on the side wall of the piston rod (22), wherein the oil hole (222) is used to connect the oil chamber (221) and the rod chamber (11); The variable damping valve group (4) is arranged at the top end of the oil chamber (221), the liquid inlet of the variable damping valve group (4) is connected to the oil chamber (221), and the liquid return port of the variable damping valve group (4) is connected to the rodless chamber (12).

9. A variable damping suspension as claimed in claim 8, characterized in that: The piston rod (22) is provided with a third damping hole (223), the third damping hole (223) is located between the oil hole (222) and the piston head (21), and the diameter of the third damping hole (223) is smaller than the diameter of the oil hole (222).

10. A dump truck, characterized in that: include: A variable damping suspension as described in any one of claims 7 to 9.

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