Double-air-chamber magnetorheological fluid energy accumulator and hydro-pneumatic suspension device

Abstract

The invention discloses a double-air-chamber magnetorheological fluid energy accumulator and an oil-gas suspension device, and relates to the technical field of heavy oil-gas suspension systems, and the double-air-chamber magnetorheological fluid energy accumulator is composed of an upper lifting lug, a piston rod, a guide sleeve, a cylinder body, a lower lifting lug and the like. A plurality of cavities with different functions are arranged in the cylinder body, the cavities are separated through the upper floating piston, the lower floating piston and the pistons, communication of the cavities is achieved through valves such as a one-way circulation valve and a circulation valve, and it is ensured that magnetorheological fluid flows in order. An external magneto-rheological valve, a throttling valve and a one-way valve adjusting assembly are arranged, so that the state of the magneto-rheological fluid can be accurately adjusted; sealing materials are used at multiple positions, and leakage is effectively prevented. Through the design of the double air chambers, the buffering capacity is enhanced, and the vehicle driving comfort is improved; the reasonable structural design improves the space utilization rate; the external magneto-rheological valve can adjust the damping force in real time, the suspension performance is optimized, and the vehicle control stability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of heavy-duty oil-gas suspension systems, and in particular to a double-chamber magnetorheological fluid accumulator and an oil-gas suspension device. Background Art

[0002] In the actual operation of heavy vehicles such as wide-body mining trucks, the working environment is complex and harsh, and they often face rugged road conditions full of potholes and gravel. At present, the traditional suspension systems used by most heavy-duty vehicles, such as ordinary oil-gas suspension and mechanical suspension, have significant shortcomings. Although ordinary oil-gas suspension has a certain buffering capacity, when faced with complex and changeable road conditions, the timeliness and accuracy of its damping adjustment are poor, and it is difficult to adapt to the dynamic changes of heavy-duty vehicles under heavy loads, resulting in severe vehicle bumps. It not only affects the comfort of drivers and passengers, but also easily causes damage to goods and reduces transportation efficiency. At the same time, frequent vibrations will accelerate the wear of vehicle parts, increase maintenance costs and downtime.

[0003] However, due to its fixed stiffness and damping characteristics, the mechanical suspension cannot be dynamically adjusted according to real-time road conditions and vehicle load. Under heavy load conditions, the suspension performance declines significantly, affecting the vehicle's driving stability and comfort.

[0004] As the heavy-duty vehicle industry develops towards larger and heavier loads, the performance requirements for suspension systems are increasing. Magnetorheological fluid, as a new type of intelligent material, has the advantage of rapidly changing rheological properties under the action of a magnetic field. When applied to heavy-duty vehicle suspensions, it can achieve precise adjustment of suspension damping. Summary of the invention

[0005] The purpose of the present invention is to provide a dual-chamber magnetorheological fluid accumulator and an oil-gas suspension device, which can achieve rapid and precise adjustment of the suspension damping force through the application of an integrated dual-chamber structure and an external magnetorheological valve, thereby improving the ride comfort and handling stability of the vehicle.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A dual-chamber magnetorheological fluid accumulator and oil-gas suspension device, mainly composed of an upper lifting ear, a piston rod, a guide sleeve, a cylinder body, a lower lifting ear and the like to form a basic structure. A plurality of chambers with different functions are arranged inside the cylinder body, including a magnetorheological fluid upper chamber, a magnetorheological fluid lower chamber, a magnetorheological fluid middle chamber A and a magnetorheological fluid middle chamber B. The upper floating piston separates the nitrogen upper chamber from the magnetorheological fluid middle chamber A, playing the role of isolating the gas from the magnetorheological fluid; the lower floating piston separates the magnetorheological fluid lower chamber from the nitrogen lower chamber; the piston separates the magnetorheological fluid upper chamber from the magnetorheological fluid middle chamber B; the magnetorheological fluid middle chamber A is connected to the magnetorheological fluid middle chamber B through the piston through-chamber, and the magnetorheological fluid middle chamber B is connected to the magnetorheological fluid lower chamber through the flow valve. This chamber connection structure enables the dual air chambers to work together and enhance the buffering capacity.

[0008] Preferably, the upper lifting ear is connected to the piston rod through an internal thread, the lower lifting ear is connected to the cylinder body through an internal thread, the guide sleeve is connected to the cylinder body through a bolt group A, and the piston is connected to the piston rod through a bolt group B, ensuring that the components are firmly connected and the entire device structure is reliable.

[0009] Preferably, a one-way flow valve is arranged between the piston rod and the upper floating piston, and cooperates with the piston to control the one-way flow of the magnetorheological fluid between the upper chamber of the magnetorheological fluid and the middle chamber A of the magnetorheological fluid, thereby increasing the damping force in the compression stroke and improving the performance of the device.

[0010] Preferably, a throttle valve A and a throttle valve B are provided, which are arranged on the piston and are used to connect the magnetorheological fluid middle chamber B with the magnetorheological fluid upper chamber, to ensure that the magnetorheological fluid can flow smoothly between the two chambers and maintain a reasonable flow circulation of the magnetorheological fluid in the entire device. The throttle valve controls the flow speed and direction of the magnetorheological fluid to a certain extent, and assists in optimizing the buffering performance of the suspension.

[0011] As a preferred embodiment, the device is equipped with an external magnetorheological valve, which is connected to the cylinder body through the magnetorheological fluid cavity A channel and the magnetorheological fluid cavity B channel. The external magnetorheological valve is provided with an excitation coil, an excitation coil hole seat, a magnetic isolation material and a magnetic conductive material. By using the principle of electromagnetic induction, the damping force of the magnetorheological fluid is changed and adjusted by controlling the current of the excitation coil, so as to achieve flexible damping adjustment.

[0012] As a preferred embodiment, sealing materials such as O-rings are used for sealing at multiple locations such as the upper and lower floating pistons and the guide sleeve to effectively prevent leakage and ensure stable operation of the device.

[0013] In the above technical solution, the present invention provides a dual-chamber magnetorheological fluid accumulator and an oil-gas suspension device, which have the following beneficial effects:

[0014] 1. The present invention, through the dual air chamber structure and the unique chamber connection design, when the vehicle is impacted by the road surface, the magnetorheological fluid in the upper chamber and the lower chamber flows through a specific channel under the action of the pressure difference, which can efficiently absorb and buffer the impact energy.

[0015] 2. The present invention flexibly adjusts the magnetic field strength by precisely controlling the current of the excitation coil in the external magnetorheological valve. As the magnetic field strength changes, the rheological properties of the magnetorheological fluid change, and its damping force can be adjusted in real time. During vehicle driving, the damping force can be adjusted in real time according to the driving conditions, thereby improving the vehicle's controllability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0017] Figure 1 A schematic structural diagram of a dual-chamber magnetorheological fluid accumulator and an oil-gas suspension device provided in an embodiment of the present invention;

[0018] Figure 2 A schematic diagram of the structure of a one-way flow valve provided in an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the structure of an external magnetorheological valve provided in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the magnetic circuit structure of an external magnetorheological valve provided in an embodiment of the present invention.

[0021] Reference numerals:

[0022] 1. Upper lifting lug; 2. Piston rod; 3. Bolt group A; 4. Guide sleeve; 5. Cylinder body; 6. Upper chamber of magnetorheological fluid; 7. One-way flow valve; 8. Throttle valve A; 9. Piston; 10. Piston through chamber; 11. Flow valve; 12. Lower chamber of magnetorheological fluid; 13. Lower floating piston; 14. Upper charging and discharging valve; 15. Upper chamber of nitrogen; 16. Upper floating piston; 17. Middle chamber of magnetorheological fluid A; 18. Magnetorheological fluid Liquid upper cavity channel; 19, throttle valve B; 20, magnetorheological fluid middle cavity B; 21, excitation coil; 22, magnetorheological fluid middle cavity B channel; 23, excitation coil hole seat; 24, nitrogen lower cavity; 25, shock-proof pad; 26, lower charging and discharging valve; 27, lower lifting ear; 28, wire hole; 29, magnetic conductive material; 30, external magnetorheological valve; 31, sealing material; 32, bolt group B; 33, magnetic isolation material. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, the present invention provides a dual-chamber magnetorheological fluid accumulator and oil-gas suspension device, characterized in that it has a basic structure consisting of an upper lifting ear 1, a piston rod 2, a bolt group A, a guide sleeve 4, a cylinder body 5, and a lower lifting ear 27; a plurality of chambers with different functions are arranged inside the cylinder body 5, including a magnetorheological fluid upper chamber 6, a magnetorheological fluid lower chamber 12, a magnetorheological fluid middle chamber A17, and a magnetorheological fluid middle chamber B20; the separation and connection between the chambers are achieved by an upper floating piston 16, a lower floating piston 13, a piston 9, and a series of valve components; at the same time, control components such as an external magnetorheological valve 30, a throttle valve A8, and a throttle valve B19 are provided to achieve the adjustment of the magnetorheological fluid flow and suspension performance; in the entire mechanical design, sealing materials 31 are used for sealing in multiple places, including upper and lower floating pistons, guide sleeves, and other positions; the external magnetorheological valve 30 is composed of an excitation coil 21, an excitation coil hole seat 23, a wire hole 28, a magnetic conductive material 29, and a magnetic isolation material 33.

[0025] The upper floating piston 16 separates the nitrogen upper chamber 15 from the magnetorheological fluid middle chamber A17, and the magnetorheological fluid middle chamber A17 is connected with the magnetorheological fluid middle chamber B20 through the piston through chamber 10, together forming the magnetorheological fluid middle chamber; the piston 9 separates the cylinder body 5 into the magnetorheological fluid upper chamber 6 and the magnetorheological fluid middle chamber B20; the magnetorheological fluid middle chamber B20 is connected with the magnetorheological fluid lower chamber 12 through the circulation valve 11, and the lower floating piston 13 separates the lower space of the cylinder body 5 into the magnetorheological fluid lower chamber 12 and the nitrogen lower chamber 24; the upper lifting ear 1 is used to connect with the vehicle frame, and the lower lifting ear 27 is used to connect with the vehicle axle, so as to install the entire suspension device on the vehicle; wherein the upper lifting ear 1 is connected with the piston rod 2 through an internal thread, and the lower lifting ear 27 is connected with the cylinder body 5 through an internal thread; the guide sleeve 4 is connected with the cylinder body 5 through a bolt group A, and the piston 9 is connected with the piston rod 2 through a bolt group B32.

[0026] The one-way flow valve 7 is arranged between the piston rod 2 and the upper floating piston 16, and cooperates with the piston 9 to control the one-way flow of the magnetorheological fluid between the magnetorheological fluid upper chamber 6 and the magnetorheological fluid middle chamber A17; the throttle valve A8 and the throttle valve B19 are arranged on the piston 9 to connect the magnetorheological fluid middle chamber B20 with the magnetorheological fluid upper chamber 6 to adjust the flow rate of the magnetorheological fluid between the two chambers.

[0027] The external magnetorheological valve 30 is connected to the cylinder body 5 through the magnetorheological fluid cavity A channel 18 and the magnetorheological fluid cavity B channel 22. An excitation coil 21, an excitation coil hole seat 23, a magnetic conductive material 29 and a magnetic isolation material 33 are arranged inside the external magnetorheological valve 30. By controlling the current of the excitation coil 21, the damping force of the magnetorheological fluid can be adjusted; the upper charging and discharging valve 14 is arranged at the upper part of the cylinder body 5, and is used for charging and discharging the nitrogen upper cavity 15; the lower charging and discharging valve 26 is arranged at the lower part of the cylinder body 5, and is used for charging and discharging the nitrogen lower cavity 24.

[0028] like Figure 2 As shown, it is a schematic diagram of the structure of the one-way flow valve provided in an embodiment of the present invention, which is used to control the one-way flow of magnetorheological fluid between the magnetorheological fluid upper chamber 6 and the magnetorheological fluid middle chamber A17. During the compression stroke, the one-way flow valve 7 is closed, and the magnetorheological fluid in the magnetorheological fluid middle chamber A17 cannot flow into the magnetorheological fluid upper chamber 6. During the extension stroke, the one-way flow valve 7 is opened, and the magnetorheological fluid in the magnetorheological fluid middle chamber A17 will flow into the magnetorheological fluid upper chamber 6.

[0029] like Figure 3 As shown, it is a schematic diagram of the structure of an external magnetorheological valve provided in an embodiment of the present invention, which consists of an excitation coil 21, an excitation coil hole seat 23, a wire hole 28, a magnetic conductive material 29 and a magnetic isolation material 33. The excitation coil 21 is wound on the excitation coil hole seat 23, and the magnetic isolation material 33 is arranged on the upper and lower sides thereof, and the rest is the magnetic conductive material 29. The wire of the excitation coil 21 is led out from the wire hole 28.

[0030] like Figure 4 As shown, it is a schematic diagram of the structure of an external magnetorheological valve provided in an embodiment of the present invention. The magnetic field generated by the excitation coil 21 is perpendicular to the channel 22 of the cavity B in the magnetorheological fluid. The size of the magnetic field is changed by inputting different currents, thereby changing the flow characteristics of the magnetorheological fluid and achieving controllable damping force.

[0031] Working process: When the suspension is in the extension stroke, the one-way flow valve 7 is closed, and the external force causes the upper lifting ear 1 to move upward relative to the lower lifting ear 27. Since the piston rod 2 is connected to the upper lifting ear 1, the piston rod 2 drives the piston 9 to move upward in the cylinder 5. As the piston 9 moves upward, the volume of the magnetorheological fluid middle cavity B20 increases, and the volume of the magnetorheological fluid upper cavity 6 decreases. Under the action of the pressure difference, the magnetorheological fluid in the magnetorheological fluid upper cavity 6 flows into the magnetorheological fluid middle cavity B20 through the throttle valve A8, the throttle valve B19 and the external magnetorheological valve 30. Due to the existence of the piston rod 2, the volume of the magnetorheological fluid upper cavity 6 is smaller than the volume of the magnetorheological fluid middle cavity B20. The accumulation causes a vacuum degree to be generated in the magnetorheological fluid middle cavity B20. Under the action of the vacuum degree and the pressure of the inert gas in the air cavity, the upper floating piston 16 and the lower floating piston 13 are respectively pushed to move toward the magnetorheological fluid middle cavity B20, and the magnetorheological fluid in the magnetorheological fluid middle cavity A17 and the magnetorheological fluid lower cavity 12 flows into the magnetorheological fluid middle cavity B20 through the piston through cavity 10 and the flow valve 11, which plays a role in fluid replenishment. By controlling the external magnetorheological valve 30, different currents are input to change the size of the magnetic field, thereby changing the flow characteristics of the magnetorheological fluid, realizing controllable damping force, and then adjusting the damping characteristics during the extension of the suspension to consume energy and suppress jumping.

[0032] When the suspension is in the compression stroke, the one-way flow valve 7 is opened, and the external force causes the upper hanging ear 1 to move downward relative to the lower hanging ear 27. Since the piston rod 2 is connected to the upper hanging ear 1, the piston rod 2 drives the piston 9 to move downward in the cylinder 5. As the piston 9 moves downward, the volume of the magnetorheological fluid middle cavity B20 is compressed and reduced, and the volume of the magnetorheological fluid upper cavity 6 increases. The magnetorheological fluid in the magnetorheological fluid middle cavity B20 flows into the magnetorheological fluid upper cavity 6 through the one-way flow valve 7, the throttle valve A8, the throttle valve B19 and the external magnetorheological valve 30. Due to the existence of , the volume of the upper chamber 6 of the magnetorheological fluid is less than the volume of the middle chamber B20 of the magnetorheological fluid, so that the magnetorheological fluid pressure in the middle chamber B20 of the magnetorheological fluid pushes the upper floating piston 16 and the lower floating piston 13 to move to the upper and lower sides respectively, and the magnetorheological fluid in the middle chamber B20 of the magnetorheological fluid flows into the middle chamber A17 of the magnetorheological fluid and the lower chamber 12 of the magnetorheological fluid through the piston through chamber 10 and the flow valve 11 respectively, thereby compressing the inert gas in the upper nitrogen chamber 15 and the lower nitrogen chamber 24, playing a spring role, so that the suspension system can mitigate the impact. By controlling the external magnetorheological valve 30, according to different road conditions, different currents are input to change the size of the magnetic field to adjust the damping force, so that the suspension can smoothly buffer the impact of the road surface during the compression stroke.

[0033] The above only describes certain exemplary embodiments of the present invention by way of illustration. It is undoubted that, for a person skilled in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A dual-chamber magnetorheological fluid accumulator and an oil-gas suspension device, characterized in that: The invention has a basic structure consisting of an upper lifting ear (1), a piston rod (2), a bolt group A, a guide sleeve (4), a cylinder body (5), and a lower lifting ear (27); a plurality of chambers with different functions are arranged inside the cylinder body (5), including a magnetorheological fluid upper chamber (6), a magnetorheological fluid lower chamber (12), a magnetorheological fluid middle chamber A (17), and a magnetorheological fluid middle chamber B (20); the separation and connection between the chambers are realized by an upper floating piston (16), a lower floating piston (13), a piston (9), and a series of valve components. The invention relates to a mechanical device for controlling a magnetorheological fluid and a suspension. The mechanical device is connected to the magnetorheological fluid by a plurality of means, wherein the magnetorheological fluid is connected to the suspension. The mechanical device is provided with an external magnetorheological valve (30), a throttle valve A (8), a throttle valve B (19) and other control components to adjust the flow of the magnetorheological fluid and the performance of the suspension. In the entire mechanical design, sealing materials (31) are used for sealing at multiple locations, including upper and lower floating pistons, guide sleeves and other locations. The external magnetorheological valve (30) is composed of an excitation coil (21), an excitation coil hole seat (23), a wire hole (28), a magnetic conductive material (29) and a magnetic isolation material (33).

2. A dual-chamber magnetorheological fluid accumulator and oil-gas suspension device according to claim 1, characterized in that: The upper lifting lug (1) is used to connect to the vehicle frame, and the lower lifting lug (27) is used to connect to the vehicle axle, so that the entire suspension device is installed on the vehicle; wherein the upper lifting lug (1) is connected to the piston rod (2) via an internal thread, and the lower lifting lug (27) is connected to the cylinder body (5) via an internal thread; the guide sleeve (4) is connected to the cylinder body (5) via a bolt group A, and the piston (9) is connected to the piston rod (2) via a bolt group B (32).

3. A dual-chamber magnetorheological fluid accumulator and oil-gas suspension device according to claim 1, characterized in that: The upper floating piston (16) separates the nitrogen upper chamber (15) from the magnetorheological fluid middle chamber A (17); the magnetorheological fluid middle chamber A (17) is connected to the magnetorheological fluid middle chamber B (20) through the piston through chamber (10), and together they constitute the magnetorheological fluid middle chamber; the piston (9) separates the cylinder body (5) into the magnetorheological fluid upper chamber (6) and the magnetorheological fluid middle chamber B (20); the magnetorheological fluid middle chamber B (20) is connected to the magnetorheological fluid lower chamber (12) through the circulation valve (11); the lower floating piston (13) separates the lower space of the cylinder body (5) into the magnetorheological fluid lower chamber (12) and the nitrogen lower chamber (24); and sealing materials (31) are used at the connection points of these components to ensure the sealing performance.

4. A dual-chamber magnetorheological fluid accumulator and oil-gas suspension device according to claim 1, characterized in that: The one-way flow valve (7) is arranged between the piston rod (2) and the upper floating piston (16), and cooperates with the piston (9) to control the one-way flow of the magnetorheological fluid between the magnetorheological fluid upper chamber (6) and the magnetorheological fluid middle chamber A (17); the throttle valve A (8) and the throttle valve B (19) are arranged on the piston (9) to connect the magnetorheological fluid middle chamber B (20) and the magnetorheological fluid upper chamber (6) to adjust the flow rate of the magnetorheological fluid between the two chambers.

5. A dual-chamber magnetorheological fluid accumulator and oil-gas suspension device according to claim 1, characterized in that: The external magnetorheological valve (30) is connected to the cylinder body (5) through the magnetorheological fluid cavity A channel (18) and the magnetorheological fluid cavity B channel (22), and is provided with an excitation coil (21), an excitation coil hole seat (23), a wire hole (28), a magnetic conductive material (29) and a magnetic isolation material (33) therein. By controlling the current of the excitation coil (21), the damping force of the magnetorheological fluid can be adjusted.

6. A dual-chamber magnetorheological fluid accumulator and oil-gas suspension device according to claim 1, characterized in that: The upper charging and discharging valve (14) is arranged at the upper part of the cylinder body (5) and is used for charging and discharging the upper nitrogen chamber (15); the lower charging and discharging valve (26) is arranged at the lower part of the cylinder body (5) and is used for charging and discharging the lower nitrogen chamber (24).

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