Oil gas damping device, oil gas suspension system and vehicle

Abstract

The invention relates to the technical field of damping devices, in particular to an oil-gas damping device, an oil-gas suspension system and a vehicle. One end of the oil-gas damping device is connected with a frame, and the other end of the oil-gas damping device is connected with an axle; the oil-gas damping device defines a first chamber used for containing gas and a second chamber used for containing liquid. The volume of the gas in the first chamber is reversely related to the axial pressure load value borne by the oil-gas damping device, the length of the oil-gas damping device is positively related to the volume of the liquid in the second chamber, and the oil-gas damping device and the oil-gas suspension system applying the oil-gas damping device improve the safety of vehicle running.

Description

Technical Field

[0001] The invention relates to a vibration reduction device, and in particular to an oil-gas vibration reduction device, an oil-gas suspension system and a vehicle. Background Art

[0002] Heavy-loaded construction vehicles work in harsh conditions, with bumpy roads and large ups and downs. In severe cases, the transport vehicle will lose balance, parts will be damaged, and even mechanical and personal accidents may occur. Therefore, construction vehicles must be equipped with buffer and vibration reduction devices.

[0003] Some existing heavy-duty engineering vehicles use leaf springs as elastic vibration-damping elements connecting the axle and the frame. However, there are also some problems, such as Figure 1 As shown in the figure, when the load is uneven (i.e. the weight of the cargo is unevenly distributed in the width direction of the vehicle), the force exerted by the cargo on the frame is uneven in the width direction of the vehicle, with the heavier side ( Figure 1 The leaf spring (center left) is subjected to greater pressure and correspondingly larger deformation, causing the frame to tilt toward that side, causing the cargo to further slide toward that side, resulting in additional roll, and in severe cases even causing the vehicle to overturn. Summary of the invention

[0004] In view of the above-mentioned prior art, the present invention provides an oil-gas vibration reduction device, an oil-gas suspension system and a vehicle to solve the above-mentioned technical problems.

[0005] One aspect of an embodiment of the present invention provides an oil-gas vibration damping device, one end of which is connected to a vehicle frame and the other end is connected to a vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; the volume of the gas in the first chamber is inversely correlated to the axial pressure load value to which the oil-gas vibration damping device is subjected, and the length of the oil-gas vibration damping device is positively correlated to the volume of the liquid in the second chamber.

[0006] One aspect of an embodiment of the present invention provides an oil-gas suspension system, comprising: An oil-gas vibration damping device is arranged on both sides of the vehicle in the width direction, one end of the oil-gas vibration damping device is connected to the vehicle frame, and the other end is connected to the vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; the volume of the gas in the first chamber is inversely correlated to the axial pressure load value of the oil-gas vibration damping device, and the length of the oil-gas vibration damping device is positively correlated to the volume of the liquid in the second chamber, a pressure source configured to provide pressurized liquid to the second chamber; a liquid storage container configured to receive liquid from the second chamber; a load sensing valve group, fluidly connected to the oil-gas vibration reduction device; the load sensing valve group is configured to fluidly connect one of the pressure source and the liquid storage container to the second chamber; Among them, on at least one side in the width direction of the vehicle, when the distance between the axle and the frame is less than a preset distance, liquid is added to the second chamber of the oil-gas shock absorbing device on said one side from the pressure source; when the distance between the axle and the frame is greater than the preset distance, liquid is discharged from the oil-gas shock absorbing device on said one side to the liquid storage container.

[0007] As a preferred embodiment, the load sensing valve group has a closed state in which the second chamber is closed, an oil replenishment state in which the pressure source is connected to the second chamber, and an oil leakage state in which the liquid storage container is connected to the second chamber.

[0008] As a preferred embodiment, the load sensing valve group has a balancing valve, and the balancing valve has a balancing valve inlet pipeline connected to the pressure source, a balancing valve outlet pipeline connected to the liquid storage container, and a working port pipeline connected to the second chamber; In the oil replenishment state, the balancing valve inlet pipeline is connected to the working port pipeline, In the oil leakage state, the balance valve outlet pipeline is connected to the working port pipeline; In the closed state, the balancing valve inlet pipeline, the balancing valve outlet pipeline and the working port pipeline are all closed.

[0009] As a preferred embodiment, the load sensing valve group has a balancing valve. The load sensing valve group is fixed to the vehicle frame, and the valve core of the balance valve is elastically and detachably connected to the vehicle axle.

[0010] As a preferred embodiment, the load sensing valve assembly further comprises a damping unit, the damping unit defines a first chamber and a second chamber, the first chamber and the second chamber are configured to have a flow-limiting communication path; A piston is provided between the first chamber and the second chamber, and the piston is connected to the valve core of the balancing valve.

[0011] As a preferred embodiment, in the damping unit, a return spring is provided in the first chamber for pushing the valve core of the balancing valve to move downward when the valve core is separated from the axle.

[0012] As a preferred embodiment, the load sensing valve group includes a feedback rod, one end of which is connected to the valve core of the balance valve, and the other end of which is against an elastic element fixed on the axle; The elastic force of the elastic element is greater than the elastic force of the return spring.

[0013] As a preferred embodiment, the elastic element is an elastic spring. When the axles are adjacent to each other in the front-rear direction of the vehicle, the two ends of the elastic spring are respectively connected to the front axle and the rear axle; the lower end of the feedback rod abuts against the middle of the elastic spring.

[0014] As a preferred embodiment, the pressure source further comprises an accumulator fluidly connected to the load sensing valve group for supplying pressurized liquid to the load sensing valve group.

[0015] Another aspect of the present invention provides an oil-gas suspension system, comprising: An oil-gas vibration damping device is provided on both sides of the vehicle in the width direction, one end of the oil-gas vibration damping device is connected to the vehicle frame, and the other end is connected to the vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; the volume of the gas in the first chamber is inversely correlated to the axial pressure load value of the oil-gas vibration damping device, and the length of the oil-gas vibration damping device is positively correlated to the volume of the liquid in the second chamber; a pressure source configured to provide pressurized liquid to the second chamber; a liquid storage container configured to receive liquid from the second chamber; two load sensing valve groups corresponding to and fluidly connected to the oil-gas vibration damping devices on one side in the vehicle width direction, respectively, the load sensing valve groups being configured to be able to fluidly connect one of the pressure source and the liquid storage container to the second chamber; An inclination sensor connected to the vehicle frame and used to detect the inclination angle of the vehicle frame in the vehicle width direction and send an inclination angle signal to the controller; A controller is respectively connected to the inclination sensor and the load-sensing valve group signal, and is configured to receive the inclination angle signal, determine the inclination condition of the frame in the vehicle width direction according to the inclination angle signal, and control the load-sensing valve group on the lower side in the vehicle width direction to replenish liquid into the second chamber of the oil-gas vibration damping device corresponding thereto, and / or control the load-sensing valve group on the higher side in the vehicle width direction to discharge part of the liquid in the second chamber of the oil-gas vibration damping device corresponding thereto to the liquid storage container.

[0016] Another aspect of the present invention provides a vehicle, comprising: A vehicle axle, with wheels provided at both ends of the vehicle axle; A vehicle frame, located on the upper side of the axle; An oil-gas vibration damping device is arranged on both sides of the vehicle in the width direction, one end of the oil-gas vibration damping device is connected to the vehicle frame, and the other end is connected to the vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; when the oil-gas vibration damping device is subjected to axial pressure, the volume of the gas in the first chamber is compressed and shortened, and the length of the oil-gas vibration damping device is positively correlated with the volume of the liquid in the second chamber, a pressure source configured to provide pressurized liquid to the second chamber; a liquid storage container configured to receive liquid from the second chamber; a load sensing valve group, fluidly connected to the oil-gas vibration reduction device; the load sensing valve group is configured to fluidly connect one of the pressure source and the liquid storage container to the second chamber; Among them, on at least one side in the width direction of the vehicle, when the distance between the axle and the frame is less than a preset distance, liquid is added to the second chamber of the oil-gas shock absorbing device on said one side from the pressure source; when the distance between the axle and the frame is greater than the preset distance, liquid is discharged from the oil-gas shock absorbing device on said one side to the liquid storage container. Another aspect of the present invention provides a vehicle, comprising: A vehicle axle, with wheels provided at both ends of the vehicle axle; A vehicle frame, located on the upper side of the axle; An oil-gas vibration damping device is provided on both sides of the vehicle in the width direction, one end of the oil-gas vibration damping device is connected to the vehicle frame, and the other end is connected to the vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; the volume of the gas in the first chamber is inversely correlated to the axial pressure load value of the oil-gas vibration damping device, and the length of the oil-gas vibration damping device is positively correlated to the volume of the liquid in the second chamber; a pressure source configured to provide pressurized liquid to the second chamber; a liquid storage container configured to receive liquid from the second chamber; Two load sensing valve groups corresponding to and fluidly connected to the oil-gas vibration damping device on one side of the vehicle width direction; the load sensing valve group is configured to fluidly connect the pressure source and one of the liquid storage container to the second chamber; An inclination sensor connected to the vehicle frame and used to detect the inclination angle of the vehicle frame in the vehicle width direction and send an inclination angle signal to the controller; A controller is respectively connected to the inclination sensor and the load-sensing valve group signal, and is configured to receive the inclination angle signal, determine the inclination condition of the frame in the vehicle width direction according to the inclination angle signal, and control the load-sensing valve group on the lower side in the vehicle width direction to replenish liquid into the second chamber of the oil-gas vibration damping device corresponding thereto, and / or control the load-sensing valve group on the higher side in the vehicle width direction to discharge liquid in the second chamber of the oil-gas vibration damping device corresponding thereto to the liquid storage container.

[0017] According to the present invention, by dynamically adjusting the length of the oil-gas vibration reduction device, the vehicle frame is kept roughly parallel to the road surface, thereby reducing the risk of vehicle overturning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a vehicle in the prior art when an uneven load occurs; Figure 2 is a schematic structural diagram of a vehicle according to an embodiment of the present invention; Figure 3 A structural diagram of an oil-gas vibration reduction device according to an embodiment of the present invention; Figure 4 A schematic diagram of the hydraulic principle of the oil-gas suspension system according to the first embodiment of the present invention; Figure 5 A schematic diagram showing the hydraulic principle of a load sensing valve group in a hydro-pneumatic suspension system according to a first embodiment of the present invention in a closed state; Figure 6 A schematic diagram of the hydraulic principle of the load sensing valve group in the oil-gas suspension system according to the first embodiment of the present invention is shown in the oil replenishment state; Figure 7 A schematic diagram showing the hydraulic principle of a load sensing valve group in an oil-gas suspension system according to a first embodiment of the present invention in an oil-draining state; Figure 8 A schematic diagram showing a state where a vehicle using the oil-gas suspension system according to the first embodiment of the present invention is traveling on an inclined road; Fig. 9 It is a schematic diagram of the hydraulic principle of the load sensing valve group in the oil-gas suspension system of the second embodiment of the present invention when it is in a closed state; Fig.10 It is a schematic diagram of the hydraulic principle of the load sensing valve group in the oil-gas suspension system of the second embodiment of the present invention in the oil replenishing state; Fig.11 It is a schematic diagram of the hydraulic principle of the load sensing valve group in the oil-gas suspension system of the second embodiment of the present invention in the oil leakage state; Fig.12 The diagram is a schematic diagram of a vehicle using a hydro-pneumatic suspension system according to a second embodiment of the present invention while traveling on an inclined road.

[0019] Explanation of symbols 1. Vehicle; 2. Carriage; 3. Frame; 4. Wheels; 10, 20, oil and gas suspension system; 12. Hydraulic source; 13. Oil supply pipeline; 14. Liquid storage container; 15. Oil return pipeline; 16. Accumulator; 18, 18a, 18b oil and gas vibration reduction device; 20. Axle; 22. Feedback lever; 24. Elastic element; 26. Outer cylinder; 27. Inner cylinder; 28. Telescopic cylinder; 29. ​​Annular space; 30. Supplementary oil port; 31. One-way valve; 32. First chamber; 33. Outer cavity; 34. Second chamber; 35. Second accommodation chamber; 36. Floating piston; 37. Third accommodation chamber; 38. First throttle hole; 39. Second throttle hole; 40. controller; 42. inclination sensor; 100, 200, load sensing valve group; P, oil inlet; T, oil return port; A, oil outlet; 101. pilot valve; 102. pilot valve inlet pipeline; 104. pilot valve outlet pipeline; 103, first pilot flow path; 105, second pilot flow path; 106, first intermediate pipeline; 107, intermediate pipeline; 108, second intermediate pipeline; 110, damping unit; 112, first chamber; 114, second chamber; 116, piston rod; 117, piston; 118. Return spring; 120, throttle valve; 122, first throttle valve; 126, second throttle valve; 130. balancing valve; 132. balancing valve inlet pipeline; 134. balancing valve outlet pipeline; 133. Oil drain flow path; 135. Oil supply flow path; 136. Working port pipeline. DETAILED DESCRIPTION

[0020] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0021] Figure 2 Schematic diagram of the structure of a vehicle according to an embodiment of the present invention. Figure 2 The middle coordinate system indicates the directions of the upper side and the right side, the opposite side of the upper side is the lower side, and the opposite side of the right side is the left side. In addition, the left and right directions in the specification can also be expressed as "the width direction of the vehicle".

[0022]

Vehicle 1

[0023]

Oil-gas vibration damping device 18

[0024] The gas-oil vibration damping device 18 has a first chamber 32 for accommodating gas and a second chamber 34 for accommodating hydraulic oil.

[0025] Specifically, the oil-gas vibration damping device 18 includes an outer cylinder 26, an inner cylinder 27 and a telescopic cylinder 28. The inner cylinder sleeve 27 is arranged on the inner side of the outer cylinder 26. The upper end of the telescopic cylinder 28 is located in the annular space 29 between the outer cylinder 26 and the inner cylinder 27. The telescopic cylinder 28 is connected to the outer cylinder 26 by sliding up and down.

[0026] A floating piston 36 that can slide up and down is provided inside the inner cylinder 27 . The floating piston 36 divides the inner cavity of the inner cylinder 27 into a first chamber 32 located on the upper side of the floating piston 36 and a second accommodation chamber 35 located on the lower side of the floating piston 36 .

[0027] The annular space 29 is directly connected to the third accommodation chamber 37 on the lower inner side of the telescopic tube 28 via the annular gap between the telescopic tube 28 and the inner cylinder 27 .

[0028] The outer cavity 33 between the telescopic cylinder 28 and the outer cylinder 26 is connected through the second throttle hole 39. The second throttle hole 39 is used to slow down the movement speed of the telescopic cylinder 28 relative to the outer cylinder 26 when the telescopic cylinder 28 is extended and retracted, thereby reducing vibration of the vehicle.

[0029] A one-way valve 31 and a first throttle hole 38 are provided at the lower end of the inner cylinder 27. The one-way valve 31 is used to limit the one-way flow of hydraulic oil from the third accommodation chamber 37; and the first throttle hole 38 can play a throttling role on the hydraulic oil flowing from the second accommodation chamber 35 to the third accommodation chamber 37 when the one-way valve 31 is closed. Therefore, when the vehicle is driving on a bumpy road, the hydraulic oil can quickly flow from the third accommodation chamber 37 to the second accommodation chamber 35, so that the floating piston 36 compresses the nitrogen in the first chamber 32, which plays a vibration reduction role. The fluid flowing from the second accommodation chamber 35 to the third accommodation chamber 37 can play a throttling role, preventing the oil-gas vibration reduction device 18 from extending too quickly and causing the vehicle to shake.

[0030] The annular space 29 , the outer cavity 33 , the second accommodation chamber 35 , and the third accommodation chamber 37 form the second chamber 34 for accommodating hydraulic oil.

[0031] Since gas is compressible, filling gas into the first chamber 32 can make the oil-gas vibration damping device 18 elastic. The gas may be nitrogen, carbon dioxide, inert gas, etc.

[0032] The side wall of the outer cylinder 26 is provided with an oil replenishment and drain port 30 connected to the second chamber 34. Since the oil is incompressible, the telescopic cylinder 28 can be extended downward by filling the second chamber 34 with oil, thereby increasing the length of the oil-gas vibration damping device 18, and the telescopic cylinder 28 can be retracted by discharging the hydraulic oil in the second chamber 34, thereby reducing the length of the oil-gas vibration damping device 18. The hydraulic oil in the second chamber 34 can also be replaced by other incompressible fluids.

[0033] In addition, the Chinese utility model patent CN220726954U previously applied by the applicant of the present invention discloses an oil-gas vibration reduction device with a structure.

[0034]

Hydro-pneumatic suspension system 10

[0035] The hydraulic source 12 is fluidly connected to the oil inlet P of the load sensing valve group 100 through the oil supply pipeline 13, and supplies hydraulic oil to the load sensing valve group 100. The oil return port T of the load sensing valve group 100 is fluidly connected to the liquid storage container 14 through the oil return pipeline 15, and its oil outlet A is fluidly connected to the oil replenishment and drain port 30 of the oil-gas vibration damping device 18a, which is used to replenish oil to the oil-gas vibration damping device 18a, or return the hydraulic oil discharged from the oil-gas vibration damping device 18a to the liquid storage container 14. Preferably, an accumulator 16 can be installed on the oil supply pipeline 13, so that high-pressure hydraulic oil can still be provided to the oil-gas suspension system 10 when the hydraulic source 12 stops working.

[0036] An oil-gas vibration damping device 18a is installed on the left side of the width direction of the vehicle 1, and an oil-gas vibration damping device 18b is installed on the right side of the width direction of the vehicle 1. The oil-gas vibration damping device 18a can be one or more; correspondingly, the oil-gas vibration damping device 18b can also be one or more. When there are multiple oil-gas vibration damping devices 18a on the left side in the width direction, the multiple oil-gas vibration damping devices 18a on the left side are arranged in the front-to-back direction, for example; when there are multiple oil-gas vibration damping devices 18b on the right side in the width direction, the multiple oil-gas vibration damping devices 18b on the right side can be arranged in the front-to-back direction, for example. In addition, the oil replenishment and drain ports 30 of the oil-gas vibration damping devices 18a or 18b on the same side can be connected in parallel, and the hydraulic oil in the oil-gas vibration damping devices 18a and the oil-gas vibration damping devices 18b can flow to each other, thereby forming a balanced suspension in the front-to-back direction of the vehicle, which plays a role in reducing the vibration amplitude.

[0037] Accordingly, two sets of the above-mentioned oil-gas suspension systems 10 can be arranged on the vehicle 1, one set of the oil-gas suspension systems 10 is fluidically connected to the oil-gas vibration damping device 18a; and the other set of the oil-gas suspension system 10 is fluidically connected to the oil-gas vibration damping device 18b.

[0038]

Load sensing valve group 100

[0039] like Figure 4 As shown, the free end of the feedback rod 22 of the load sensing valve group 100 is elastically and detachably connected to the axle 20. The free end of the feedback rod 22 can be against the elastic element 24, and the elastic element 24 can be fixed on the axle 20. The feedback rod 22 of the load sensing valve group 100 can detect the relative position change between the frame 3 and the axle 20, and output the corresponding oil flow to the oil-gas vibration reduction device 18 according to the relative position change, control the extension and contraction of the oil-gas vibration reduction device 18, and realize the dynamic variable load control between the frame 3 and the axle 20. In addition, the lower end of the feedback rod 22 will be touched only when the distance between the axle 20 and the frame 3 is about to be less than the preset distance, so as to avoid frequent operation of the load sensing valve group 100 and cause a large amount of energy loss.

[0040] In addition, the feedback rod 22 itself may also be elastic. For example, the feedback rod 22 is a coil spring, and the lower end of the feedback rod 22 abuts against the axle 20, which can also achieve the above function.

[0041] In addition, when there are two axles 20 (referring to the number of axles located at the rear side of the vehicle for bearing the weight of the cargo in the vehicle box), the elastic element 24 may be, for example, an elastic leaf spring, one end of which is connected to the front axle 20, and the other end is connected to the rear axle 20, and the free end of the feedback rod 22 abuts against the middle of the elastic leaf spring. In this way, the distance between the axle 20 and the frame 3 is the average of the distances between the front and rear axles and the frame 3, which can play a role in buffering vehicle vibration.

[0042] Figure 5 The load sensing valve assembly 100 is shown in a closed state; Figure 6 It shows that the load sensing valve group 100 is in the oil replenishing state; Figure 7 The load sensing valve group 100 is shown to be in an oil drain state.

[0043] like Figure 4 and Figure 5 As shown, when the vehicle frame 3 is in a balanced position (ie, the relative heights of the left and right sides relative to the vehicle axle 20 are the same), the load sensing valve assembly 100 is in a closed state.

[0044] Specifically, the load sensing valve group 100 includes a damping unit 110 and a balancing valve 130. The hydraulic source 12 is connected to the oil inlet P of the load sensing valve group 100, and the oil return port T of the load sensing valve group 100 is connected to the liquid storage container 14. The oil outlet A of the load sensing valve group 100 is connected to the oil replenishment and drain port 30 of the oil-gas vibration reduction device 18a.

[0045] The damping unit 110 has a piston rod 116 that can reciprocate up and down. A first chamber 112 is formed at the upper part of the damping unit 110, and a second chamber 114 is formed at the lower part. A piston 117 of the damping unit 110 is located between the first chamber 112 and the second chamber 114. One end of the intermediate pipeline 107 is connected to the first chamber 112, and the other end is connected to the second chamber 114. A throttle valve 120 is connected in series to the intermediate pipeline 107, and the throttle valve 120 is used to adjust the flow rate of the fluid in the intermediate pipeline 107, thereby generating a damping effect on the up and down movement of the piston rod 116.

[0046] The upper end of the piston rod 116 is connected to the piston 117, and the lower end of the piston rod 116 is connected to the valve core of the balance valve 130. When the vehicle 1 is traveling on a bumpy road, the axle 20 shakes up and down with the wheels, and the above-mentioned shaking is transmitted to the valve core of the balance valve 130 through the elastic element 24. Without the damping effect generated by the damping unit 110, the balance valve 130 will frequently switch states, resulting in a large loss of pressure oil. The present invention, by providing the damping unit 110, can generate a damping effect on the valve core movement of the balance valve 130, so that the oil-gas suspension system is not affected by the bumpy road surface, and the above-mentioned problems are avoided.

[0047] A return spring 118 is installed in the first chamber 112 of the damping unit 110. The upper end of the return spring 118 abuts against the upper end surface of the inner chamber of the first chamber 112, and the other end abuts against the upper end of the piston 117 of the damping unit 110. When the valve core of the balancing valve 130 and the axle 20 are separated from each other (when the feedback rod 22 and the elastic element 24 are provided, the lower end of the feedback rod 22 is separated from the elastic element 24), the return spring 118 can push the valve core of the balancing valve 130 to move downward to Figure 6 Status shown.

[0048] It should be noted that the elastic force of the elastic element 24 is much greater than the elastic force of the return spring 118, so that when the axle 20 acts on the valve core of the balancing valve 130 through the elastic element 24 and the feedback rod 22, the valve core of the balancing valve 130 can be pushed to compress the return spring 118 and move upward.

[0049] exist Figure 2 In the working condition shown, the axle 20 and the frame 3 on the left side of the vehicle 1 are moved closer to each other under the gravity of the heavier cargo on the left side (due to the compression of the nitrogen in the oil-gas vibration damping device 18a). Figure 6 As shown, the axle 20 pushes the valve core of the balance valve 130 upward through the elastic element 24, and the load sensing valve group 100 switches from the closed state to the oil replenishing state. The high-pressure hydraulic oil of the oil inlet P enters the oil-gas vibration reduction device 18a in sequence through the balance valve inlet pipeline 132, the oil replenishing flow path 135 and the working port pipeline 136. The telescopic cylinder 28 of the oil-gas vibration reduction device 18a extends and increases in length to compensate for the shortening of the compressed nitrogen. When the frame 3 and the axle 20 return to the parallel state, under the action of the return spring 118, the valve core of the balance valve 130 moves downward, and the load sensing valve group 100 returns to the parallel state. Figure 5 Shown in closed state.

[0050] When the cargo in the vehicle box 2 is unloaded or arranged to be roughly the same in the width direction of the vehicle 1, the compressed nitrogen increases in volume due to the reduced load, and since the amount of oil in the oil-gas vibration reduction device 18a is greater than that in the oil-gas vibration reduction device 18b, the left side of the vehicle frame 3 is higher than the right side. Therefore, under the elastic force of the return spring 118 of the oil-gas suspension system on the left side of the vehicle, the valve core of the balance valve 130 is pushed downward, and the load sensing valve group 100 is switched from the closed state to the open state. Figure 7 The oil leakage condition is shown. Figure 7 As shown, the excess oil in the oil-gas vibration damping device 18a is discharged to the oil return port T through the working port pipeline 136, the oil leakage flow path 133 and the balance valve outlet pipeline 134. When the distance between the frame 3 and the axle 20 is restored to the same state on the left and right sides, the left part of the axle 20 pushes the valve core of the balance valve 130 to move up to the left side through the elastic element 24 and the feedback rod 22. Figure 5 Shown in closed state.

[0051] like Figure 8 As shown, when the vehicle 1 is traveling on an inclined road surface (for example, the height of the left side of the road surface is higher than that of the right side), the compressive force on the balancing vibration damping device 18b is greater than the compressive force on the balancing vibration damping device 18a due to the fact that the cargo (for example, powdered cargo, liquid cargo, etc.) in the vehicle box 2 partially slides to the right and the gravity line moves to the right. Under the action of the oil-gas suspension system 10, the length of the balancing vibration damping device 18a on the left is the same as the length of the balancing vibration damping device 18b on the right, thereby being able to keep the frame 3 parallel to the road surface without additional roll, thereby reducing the risk of vehicle overturning.

[0052] However, in Figure 8 In the state shown, the vehicle box 2 is still in an inclined state. How to make the bottom surface of the vehicle box 2 level when the vehicle 1 is traveling on an inclined road is a technical problem that those skilled in the art have long hoped to solve. To this end, the applicant of the present invention has proposed an oil-gas suspension system 20 after a long period of exploration and experimentation, which can adjust the inclination of the vehicle box 2 according to the inclination of the road surface, so that the vehicle box 2 is level, thereby solving the above technical problem.

[0053]

Hydro-pneumatic suspension system 20

[0054] The control system may include, for example, a controller 40 and a tilt sensor 42. The tilt sensor 42 is fixedly connected to the frame 3, and is used to detect the tilt state of the frame 3 in the left-right direction and send the detected frame tilt signal to the controller 42. The controller 40 is connected to the tilt sensor 42 signal, and is used to receive and respond to the frame tilt signal, control the switching state of the pilot valve 101, and further control the oil-gas vibration damping device 18a, 18b to replenish or drain oil, so as to adjust the tilt state of the frame 3 and the vehicle box 2 in the left-right direction.

[0055] Specifically, Fig. 9 As shown, the load sensing valve group 200 includes a pilot valve 101, a damping unit 110 and a balance valve 130. The hydraulic source 12 is connected to the oil inlet P of the load sensing valve group 200, and the oil return port T of the load sensing valve group 200 is connected to the liquid storage container 14. The oil outlet A of the load sensing valve group 200 is connected to the oil replenishment and drain port 30 of the oil-gas vibration reduction device 18a.

[0056] The pilot valve 101 has a first state, a second state and a third state. Fig. 9 The middle pilot valve 101 is in the second state; Fig.10 The middle pilot valve 101 is in the first state; Fig.11 The middle pilot valve 101 is in the third state.

[0057] In the load sensing valve assembly 200 , the oil inlet port P is fluidly connected to the pilot valve inlet pipeline 102 of the pilot valve 101 ; and the oil return port T is fluidly connected to the pilot valve outlet pipeline 104 of the pilot valve 101 .

[0058] When the load sensing valve assembly 200 is in a closed state, the pilot valve inlet pipeline 102 and the pilot valve outlet pipeline 104 are both in a closed state in the pilot valve 101. The first intermediate pipeline 106 and the second intermediate pipeline 108 are in a connected state in the pilot valve 101.

[0059] The damping unit 110 has a piston rod 116 that can reciprocate up and down. A first chamber 112 is formed at the upper part of the damping unit 110, and a second chamber 114 is formed at the lower part. The piston of the damping unit 110 is between the first chamber 112 and the second chamber 114. The first intermediate pipeline 106 is fluidically connected to the first chamber 112, and a first throttle valve 122 can be connected in series on the flow path between the first intermediate pipeline 106 and the first chamber 112. The second intermediate pipeline 108 is connected to the second chamber 114, and preferably, a second throttle valve 126 is connected in series on the flow path between the second intermediate pipeline 108 and the second chamber 114. The first throttle valve 122 and the second throttle valve 126 are respectively used to adjust the liquid flow rate of their respective flow paths, thereby controlling the movement speed of the piston rod 116.

[0060] The lower end of the piston rod 116 is connected to the valve core of the balancing valve 130. When oil is filled into the first chamber 112, the high-pressure hydraulic oil can push the piston rod 116 downward to switch the state of the balancing valve 130. Similarly, when hydraulic oil is filled into the second chamber 114, the high-pressure hydraulic oil can push the piston rod 116 upward to switch the state of the balancing valve 130.

[0061] exist Fig. 9 In the embodiment, the pilot valve 101 is in the second state, and the balancing valve 130 is in the closed state. Specifically, the balancing valve 130 has a balancing valve inlet pipeline 132, a balancing valve outlet pipeline 134, and a working port pipeline 136. The balancing valve inlet pipeline 132 is connected to the oil inlet P, the balancing valve outlet pipeline 134 is connected to the oil return port T, and the working port pipeline 136 is connected to the oil replenishment and drain port 30 of the oil-gas vibration reduction device 18a.

[0062] When the balancing valve 130 is in a closed state, inside the balancing valve 130 , the balancing valve inlet pipeline 132 , the balancing valve outlet pipeline 134 and the working port pipeline 136 are all in a closed state.

[0063] like Fig. 9 As shown, since the first intermediate pipeline 106 and the second intermediate pipeline 108 are in a connected state, that is, the first chamber 112 and the second chamber 114 of the damping unit 110 are in a connected state. The first throttle valve 122 and the second throttle valve 126 can play a damping role in the up and down movement of the piston rod 116 of the damping unit 110. At this time, Fig. 9 The state of the oil-gas suspension system 20 shown is similar to the working mode of the oil-gas suspension system 10 (ie, the pilot valve 101 is not provided), and the balance valve 130 is in a closed state, which will not be described in detail.

[0064] When the vehicle just drives on an inclined road (taking the left side of the road as an example, the left side is higher than the right side), the inclination sensor 42 detects that the frame 3 is in an inclined state and sends a signal to the controller 40. The controller 40 controls the pilot valve 101 to operate and switch to Fig.10 Status shown. Fig.10 In the embodiment, the pilot valve 101 is in the first state, a first pilot flow path 103 is formed between the pilot valve inlet pipeline 102 and the second intermediate pipeline 108; a second pilot flow path 105 is formed between the pilot valve outlet pipeline 104 and the first intermediate pipeline 106. Fig.11In the working state shown, the oil inlet P is fluidically connected to the second chamber 114 of the damping unit 110 through the first pilot flow path 103, and the pilot valve outlet pipeline 104 is fluidically connected to the first intermediate pipeline 106 through the second pilot flow path 105. Further, the high-pressure fluid at the oil inlet P can be filled into the second chamber 114 of the damping unit 110 through the first pilot flow path 103 to push the piston rod 116 upward, and the fluid in the first chamber 112 of the damping unit 110 flows to the oil return port T through the second pilot flow path 105. The upward movement of the piston rod 116 further drives the valve core of the balance valve 130 to move upward, and an oil replenishment flow path 135 is formed between the balance valve outlet pipeline 134 and the working port pipeline 136. The high-pressure fluid at the oil inlet P can be filled into the oil-gas vibration damping device 18b on the right side of the vehicle through the oil replenishment flow path 135. The telescopic cylinder 28 of the oil-gas vibration reduction device 18b is extended, and the right side of the frame 3 is lifted up, so that the left and right sides of the frame 3 are approximately at the same level (such as Fig.12 as shown).

[0065] When the vehicle 1 drives onto a flat road again, Fig.11 In the state shown, the pilot valve 101 is in the third state, and a first pilot flow path 103 and a second pilot flow path 105 are formed in the pilot valve 101. Through the first pilot flow path 103, the pilot valve inlet pipeline 102 and the first intermediate pipeline 106 are fluidly connected; through the second pilot flow path 105, the pilot valve outlet pipeline 104 and the second intermediate pipeline 108 are fluidly connected. Then, the high-pressure fluid of the oil inlet P replenishes the first chamber 112 of the damping unit 110 through the first pilot flow path 103, pushing the piston rod 116 to move downward. The fluid in the second chamber 114 returns to the oil return port T through the second pilot flow path 105.

[0066] The downward movement of the piston rod 116 further pushes the valve core of the balance valve 130 to move downward, forming an oil leakage path 133 in the balance valve 130, and the balance valve inlet pipeline 132 is fluidly connected with the working port pipeline 136 through the above-mentioned oil leakage path 133. The fluid in the oil-gas vibration damping device 18b flows to the oil return port T through the above-mentioned oil replenishment path 135. The height of the oil-gas vibration damping device 18b is lowered to lower the height of the frame 3 on the same side as the oil-gas vibration damping device 18b, thereby maintaining the left and right sides of the frame 3 at approximately the same height.

[0067] It should be noted that two oil-gas suspension systems 20 may be provided for the same vehicle 1, wherein one oil-gas suspension system 20 is fluidly connected to the oil-gas damping device 18a on the left, and the other oil-gas suspension system 20 is fluidly connected to the oil-gas damping device 18b on the right. The controller 40 is signal-connected to the pilot valve 101 in each oil-gas suspension system 20, so that the oil-gas damping devices 18a and 18b on the left and right sides can work in coordination.

[0068] Therefore, if Fig.12 As shown, when the vehicle 1 is traveling on a sloping road with a higher height on the left side, the purpose of making the left and right sides of the frame 1 equal in height can also be achieved by simultaneously draining oil from the oil-gas vibration damping device 18a on the left side. Alternatively, the oil-gas suspension system 20 on the right side can be started first, and oil can be filled into the oil-gas vibration damping device 18b on the right side. After a predetermined delay (e.g., 1 to 5 seconds), the inclination sensor 42 detects that the inclination angle of the frame 3 (the angle between the upper surface of the axle and the horizontal plane) is still not less than the preset value, and then the oil-gas vibration damping device 18a on the left side is shortened. Under the combined action of the oil-gas vibration damping device 18a and the oil-gas vibration damping device 18b, the frame 3 can quickly reach a horizontal state.

[0069] Similarly, when the vehicle 1 travels onto a horizontal road again, the hydraulic oil in the oil-gas vibration damping device 18b on the right side may be partially drained; after a predetermined delay, the inclination sensor 42 detects that the inclination angle of the frame 3 is still not less than the preset value, and then the oil-gas vibration damping device 18a on the left side is filled with oil, so that the frame 3 can quickly reach a horizontal state.

[0070] The above is a detailed description of the oil-gas suspension system, vehicle and method of the preferred embodiment of the present invention, but those skilled in the art can make various modifications, changes, combinations, etc. on this basis, and these modifications, changes and combinations all fall within the scope of protection of the claims of this application.

Claims

1. An oil-gas vibration reduction device, characterized in that: One end of the oil-gas vibration damping device is connected to the vehicle frame, and the other end is connected to the vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; the volume of the gas in the first chamber is inversely correlated to the axial pressure load value received by the oil-gas vibration damping device, and the length of the oil-gas vibration damping device is positively correlated to the volume of the liquid in the second chamber.

2. A hydro-pneumatic suspension system, characterized in that: have: An oil-gas vibration damping device is arranged on both sides of the vehicle in the width direction, one end of the oil-gas vibration damping device is connected to the vehicle frame, and the other end is connected to the vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; the volume of the gas in the first chamber is inversely correlated to the axial pressure load value of the oil-gas vibration damping device, and the length of the oil-gas vibration damping device is positively correlated to the volume of the liquid in the second chamber, a pressure source configured to provide pressurized liquid to the second chamber; a liquid storage container configured to receive liquid from the second chamber; a load sensing valve group, fluidly connected to the oil-gas vibration reduction device; the load sensing valve group is configured to fluidly connect one of the pressure source and the liquid storage container to the second chamber; Among them, on at least one side in the width direction of the vehicle, when the distance between the axle and the frame is less than a preset distance, liquid is added to the second chamber of the oil-gas shock absorbing device on said one side from the pressure source; when the distance between the axle and the frame is greater than the preset distance, liquid is discharged from the oil-gas shock absorbing device on said one side to the liquid storage container.

3. The oil-gas suspension system according to claim 2, characterized in that: The load sensing valve group has a closed state in which the second chamber is closed, an oil replenishment state in which the pressure source is connected to the second chamber, and an oil discharge state in which the liquid storage container is connected to the second chamber.

4. The oil-gas suspension system according to claim 3, characterized in that: The load sensing valve assembly has a balancing valve, wherein the balancing valve has a balancing valve inlet pipeline communicating with the pressure source, a balancing valve outlet pipeline communicating with the liquid storage container, and a working port pipeline communicating with the second chamber; In the oil replenishment state, the balancing valve inlet pipeline is connected to the working port pipeline, In the oil leakage state, the balance valve outlet pipeline is connected to the working port pipeline; In the closed state, the balancing valve inlet pipeline, the balancing valve outlet pipeline and the working port pipeline are all closed.

5. The oil-gas suspension system according to claim 2, characterized in that: The load sensing valve group has a balancing valve. The load sensing valve group is fixed to the vehicle frame, and the valve core of the balance valve is elastically and detachably connected to the vehicle axle.

6. The hydro-pneumatic suspension system according to claim 5, characterized in that: The load sensing valve assembly further includes a damping unit, the damping unit defining a first chamber and a second chamber, the first chamber and the second chamber being configured to have a flow-limited communication path; A piston is provided between the first chamber and the second chamber, and the piston is connected to the valve core of the balancing valve.

7. The hydro-pneumatic suspension system according to claim 6, characterized in that: In the damping unit, a return spring is provided in the first chamber for pushing the valve core of the balancing valve to move downward when the valve core is separated from the axle; The load sensing valve group includes a feedback rod, one end of which is connected to the valve core of the balance valve, and the other end of which is against an elastic element fixed on the axle; The elastic force of the elastic element is greater than the elastic force of the return spring; The elastic element is an elastic spring. When the axles are adjacent to each other in the front-rear direction of the vehicle, the two ends of the elastic spring are respectively connected to the front axle and the rear axle; the lower end of the feedback rod abuts against the middle of the elastic spring.

8. A hydro-pneumatic suspension system, characterized in that: have: An oil-gas vibration damping device is provided on both sides of the vehicle in the width direction, one end of the oil-gas vibration damping device is connected to the vehicle frame, and the other end is connected to the vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; the volume of the gas in the first chamber is inversely correlated to the axial pressure load value of the oil-gas vibration damping device, and the length of the oil-gas vibration damping device is positively correlated to the volume of the liquid in the second chamber; a pressure source configured to provide pressurized liquid to the second chamber; a liquid storage container configured to receive liquid from the second chamber; two load sensing valve groups corresponding to and fluidly connected to the oil-gas vibration damping devices on one side in the vehicle width direction, respectively, the load sensing valve groups being configured to be able to fluidly connect one of the pressure source and the liquid storage container to the second chamber; An inclination sensor connected to the vehicle frame and used to detect the inclination angle of the vehicle frame in the vehicle width direction and send an inclination angle signal to the controller; A controller is respectively connected to the tilt sensor and the load sensing valve group signal, and the controller is configured to receive the tilt angle signal, determine the tilt condition of the frame in the vehicle width direction according to the tilt angle signal, and The load sensing valve group on the lower side in the vehicle width direction is controlled to replenish liquid into the second chamber of the corresponding oil-gas vibration damping device, and / or the load sensing valve group on the higher side in the vehicle width direction is controlled to discharge part of the liquid in the second chamber of the corresponding oil-gas vibration damping device into the liquid storage container.

9. A vehicle, characterized in that: include: A vehicle axle, with wheels provided at both ends of the vehicle axle; A vehicle frame, located on the upper side of the axle; An oil-gas vibration damping device is arranged on both sides of the vehicle in the width direction, one end of the oil-gas vibration damping device is connected to the vehicle frame, and the other end is connected to the vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; when the oil-gas vibration damping device is subjected to axial pressure, the volume of the gas in the first chamber is compressed and shortened, and the length of the oil-gas vibration damping device is positively correlated with the volume of the liquid in the second chamber, a pressure source configured to provide pressurized liquid to the second chamber; a liquid storage container configured to receive liquid from the second chamber; a load sensing valve group, fluidly connected to the oil-gas vibration reduction device; the load sensing valve group is configured to fluidly connect one of the pressure source and the liquid storage container to the second chamber; Among them, on at least one side in the width direction of the vehicle, when the distance between the axle and the frame is less than a preset distance, liquid is added to the second chamber of the oil-gas shock absorbing device on said one side from the pressure source; when the distance between the axle and the frame is greater than the preset distance, liquid is discharged from the oil-gas shock absorbing device on said one side to the liquid storage container.

10. A vehicle, characterized in that: include: A vehicle axle, with wheels provided at both ends of the vehicle axle; A vehicle frame, located on the upper side of the axle; An oil-gas vibration damping device is provided on both sides of the vehicle in the width direction, one end of the oil-gas vibration damping device is connected to the vehicle frame, and the other end is connected to the vehicle axle; the oil-gas vibration damping device defines a first chamber for accommodating gas and a second chamber for accommodating liquid; the volume of the gas in the first chamber is inversely correlated to the axial pressure load value of the oil-gas vibration damping device, and the length of the oil-gas vibration damping device is positively correlated to the volume of the liquid in the second chamber; a pressure source configured to provide pressurized liquid to the second chamber; a liquid storage container configured to receive liquid from the second chamber; Two load sensing valve groups respectively corresponding to and fluidly connected to the oil-gas vibration damping device on one side in the width direction of the vehicle; The load sensing valve assembly is configured to fluidly connect one of the pressure source and the liquid storage container to the second chamber; An inclination sensor connected to the vehicle frame and used to detect the inclination angle of the vehicle frame in the vehicle width direction and send an inclination angle signal to the controller; A controller is respectively connected to the tilt sensor and the load sensing valve group signal, and the controller is configured to receive the tilt angle signal, determine the tilt condition of the frame in the vehicle width direction according to the tilt angle signal, and The load sensing valve group on the lower side in the vehicle width direction is controlled to replenish liquid into the second chamber of the corresponding oil-gas vibration damping device, and / or the load sensing valve group on the higher side in the vehicle width direction is controlled to discharge liquid in the second chamber of the corresponding oil-gas vibration damping device into the liquid storage container.

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