Vehicle suspension device

Abstract

The present invention discloses a vehicle suspension device, comprising a first bracket and a hinged second bracket, the second bracket being provided with a wheel axle, a damping mechanism being connected between the first bracket and the second bracket, the damping mechanism comprising: a telescopic column movably connected to the second bracket, an oil chamber being provided therein; a guide column movably connected to the telescopic column, the upper end of which extends out of the telescopic column and is hinged to the first bracket, the lower end of which extends into the oil chamber and is fixedly provided with a piston, the piston being provided with a flow limiting hole connecting its upper and lower sides; and an electromagnetic flow limiting assembly, which continuously limits the flow of the flow limiting hole through an external power supply. By providing an electromagnetic flow limiting assembly, the present invention can adjust the flow limiting strength under the condition of an external power supply, thereby electrically adjusting the active damping of the piston in the oil chamber as needed, and the supporting force and active damping between the first bracket and the second bracket can be changed as needed, thereby meeting the needs of a wider range of suspension usage scenarios.

Description

Technical Field

[0001] The present invention relates to the technical field of suspension, and in particular to a vehicle suspension device. Background Art

[0002] Compared with traditional fuel vehicles, new energy vehicles have a significantly increased curb weight (usually 20%-30%) due to the large-capacity battery packs they carry. In addition, the battery layout is concentrated in the chassis area, resulting in changes in the unsprung mass distribution and the vehicle's center of gravity. This characteristic places higher demands on the suspension system's load-bearing capacity, stability, and vibration suppression. Existing suspension devices can basically meet daily usage needs, but there are still some shortcomings that need to be improved.

[0003] Patent document CN102501733A, published on June 20, 2012, discloses a long-travel hydraulic suspension device for vehicles. The device comprises a suspension unit connected to a vehicle frame and an axle connected to the suspension unit. The suspension unit includes a suspension frame, a balancing arm, and a ball-jointed support cylinder. The suspension frame is rotationally connected to the vehicle frame, and the two ends of the balancing arm are rotationally connected to the suspension frame and the axle, respectively. The ball-jointed support cylinder includes a cylinder body, a piston rod mating with the cylinder body, and an inner ball head connected to the end of the piston rod. The end of the cylinder body is connected to the suspension frame, and the inner ball head is connected to the balancing arm. The present invention has the advantages of small suspension dimensions; a large suspension lifting stroke; a compact size and light weight; a large load-bearing capacity; a rational overall structure, and ease of installation, maintenance, and repair.

[0004] In the prior art such as the above-mentioned patent, the support force and active damping of the suspension often rely mainly on the physical properties of the elastic parts. However, as the mass of the car increases and changes, simply replacing the specifications of the elastic parts is not enough to adapt to the complex and changeable suspension usage scenarios. Therefore, a vehicle suspension device is urgently needed to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a vehicle suspension device to solve the above-mentioned deficiencies in the prior art.

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

[0007] A vehicle suspension device includes a first bracket for connecting to a vehicle frame, a second bracket hingedly connected to the lower end of the first bracket, a wheel axle is provided on the second bracket, and a damping mechanism is connected between the first bracket and the second bracket, the damping mechanism including: a telescopic column, which is movably connected to the second bracket and has an oil chamber provided therein; a guide column, which is movably connected to the telescopic column, with the upper end extending out of the telescopic column and hinged to the first bracket, and the lower end extending into the oil chamber and fixedly provided with a piston, the piston being provided with a flow limiting hole connecting its upper and lower sides; an electromagnetic current limiting component, which is provided in the piston and continuously limits the flow of the flow limiting hole through an external power supply.

[0008] Preferably, the upper end of the telescopic column is movably sleeved with a sleeve, the upper end of the guide column is fixedly arranged in the sleeve, and the upper end of the sleeve is hinged to the first bracket.

[0009] Preferably, an elastic member is provided between the upper end of the telescopic column and the inner top surface of the sleeve.

[0010] Preferably, the electromagnetic current limiting component includes a pressure chamber arranged in the piston, the pressure chamber is cut off in the middle of the current limiting hole, a magnetic pressure block is movably arranged in the pressure chamber, and an electromagnetic unit for applying reverse thrust to the magnetic pressure block is arranged in the center of the piston.

[0011] Preferably, a connecting hole is provided through the magnetic pressure block.

[0012] Preferably, the electromagnetic unit includes an electric control circuit arranged in the guide column, and a first electromagnet is arranged at a position corresponding to the pressure chamber on the electric control circuit. The first electromagnet generates magnetism with opposite magnetic poles at one end close to the magnetic pressure block, and the electric control circuit can adjust the magnetic strength of the first electromagnet.

[0013] Preferably, a demagnetization component for eliminating the magnetism of the magnetic pressure block is provided in the piston, and the electronic control circuit can control the switching of the end polarity of the first electromagnet. After the polarity of the end of the first electromagnet is switched to attract the magnetic pressure block, the demagnetization component is triggered to temporarily weaken the magnetism on the magnetic pressure block.

[0014] Preferably, the demagnetization component includes a protrusion provided on the magnetic pressure block, a conductive contact provided on the protrusion, a movable groove for the movement of the protrusion provided in the piston, and a discharge contact matching the conductive contact provided on the inner wall of the movable groove. When the magnetic pressure block is magnetically attracted to fit the first electromagnet, the conductive contact contacts with the discharge contact to conduct electricity to the magnetic pressure block and weaken its magnetism.

[0015] Preferably, a magnetic block controlled by an electric control circuit is rotatably provided on the portion of the guide column close to the piston, and the outer wall of the magnetic block is curved to form a curved surface and is arranged to correspond to the direction of the opening of the flow limiting hole.

[0016] Preferably, a plurality of ribs are provided on the circumference of the outer wall of the magnetic block, and the extension surface of the ribs is arranged at a certain angle to the surface where the busbar of the magnetic block is located.

[0017] In the above technical solution, the beneficial effects of the present invention are:

[0018] The vehicle suspension device is provided with an electromagnetic current limiting component. Under the condition of an external power supply, it can continuously and actively limit the current and the current limiting intensity, so that the movable damping of the piston in the oil chamber can be electronically adjusted as needed. The supporting force and movable damping between the first bracket and the second bracket can be changed as needed, thereby meeting the needs of a wider range of suspension usage scenarios. The application of the external power supply is more in line with the development and transformation of new energy vehicles, and improves the practicality of the device.

[0019] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0020] This application document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a front cross-sectional structure provided by an embodiment of the present invention;

[0024] Figure 3 The embodiment of the present invention provides Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 4 A schematic structural diagram of a magnetic pressure block provided in an embodiment of the present invention;

[0026] Figure 5 A schematic structural diagram of a magnetic block provided in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. First bracket; 2. Second bracket; 3. Axle; 4. Telescopic column; 5. Oil chamber; 6. Guide column; 7. Piston; 8. Flow-limiting hole; 9. Sleeve; 10. Elastic member; 11. Pressure chamber; 12. Magnetic pressure block; 13. Connecting hole; 14. Electric control circuit; 15. First electromagnet; 16. Raised portion; 17. Conductive contact; 18. Movable groove; 19. Discharge contact; 20. Magnetic block; 21. Rib; 22. Second electromagnet. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0030] See also Figure 1-5 A vehicle suspension device provided by an embodiment of the present invention includes a first bracket 1 for connecting to a vehicle frame, a second bracket 2 being hingedly connected to the lower end of the first bracket 1, a wheel axle 3 being provided on the second bracket 2, a damping mechanism being connected between the first bracket 1 and the second bracket 2, and the damping mechanism including: a telescopic column 4, which is movably connected to the second bracket 2 and has an oil chamber 5 provided therein; a guide column 6, which is movably connected to the telescopic column 4, and the upper end of which extends out of the telescopic column 4 and is hinged to the first bracket 1, and the lower end of which extends into the oil chamber 5 and is fixedly provided with a piston 7, and the piston 7 is provided with a flow limiting hole 8 connecting its upper and lower sides; an electromagnetic current limiting component, which is provided in the piston 7, and continuously limits the flow of the flow limiting hole 8 through an external power supply.

[0031] Specifically, the first bracket 1 is triangular in shape to ensure support strength. One corner is set downward and hinged to the second bracket 2. The axle 3 is set at the end of the second bracket 2 away from the connection to the first bracket 1. The damping mechanism is connected between one side of the upper end of the first bracket 1 and the middle part of the second bracket 2. Thus, the first bracket 1, the second bracket 2 and the damping mechanism form a triangle to ensure structural stability. The damping mechanism is used to hinder the rotation of the second bracket 2 relative to the first bracket 1. The lower end of the telescopic column 4 is movably connected to a spherical joint, and the lower end of the spherical joint is fixedly connected to the second bracket 2. The upper end of the telescopic column 4 is provided with a cavity with an open upper end. The upper end of the cavity is fixed with a cover body. The cover body is provided with a sealing hole for the guide column 6 to move through. The cover body seals and covers the cavity to form an oil chamber 5. The oil chamber 5 is filled with damping oil. The piston 7 includes a middle pressure-resistant part and an outer wear-resistant part. The piston 7 completely isolates the internal space of the oil chamber 5, so that the interior of the oil chamber 5 is divided into two parts on the upper and lower sides of the piston 7. The oil in the two parts only passes through the flow-limiting hole. 8 circulation; the average inner diameter of the flow limiting hole 8 is preferably 2-5mm; due to the small diameter of the flow limiting hole 8 and the viscosity of the oil, the rate at which the oil flows through the flow limiting hole 8 is limited, thereby hindering the movement of the piston 7 in the oil chamber 5; the electromagnetic flow limiting component adjusts the flow limiting rate of the flow limiting hole 8 by controlling the oil flux at the minimum cross-section of the flow limiting hole 8, thereby changing the activity damping of the piston 7 in the oil chamber 5; the external power supply can be powered by the power battery or fuel cell of the new energy vehicle through the integrated wiring harness, and has a stable source of electricity. In actual use of this technical solution, under the condition of an external power supply, the electromagnetic current limiting component continuously and actively maintains the current limiting function of the current limiting hole 8, so that the movement of the piston 7 in the oil is hindered, thereby hindering the extension and contraction of the telescopic column 4 relative to the guide column 6, and also hindering the rotation of the second bracket 2 relative to the first bracket 1. The damping generated thereby meets the shock absorption needs, and the electromagnetic current limiting component can electrically adjust the current limiting strength of the current limiting hole 8, thereby adjusting the activity damping of the piston 7 in the oil chamber 5 as needed. The supporting force and activity damping between the first bracket 1 and the second bracket 2 can be changed as needed, thereby meeting the needs of a wider range of suspension usage scenarios, and the application of external power supply is more in line with the development and transformation of new energy vehicles.

[0032] Compared with the prior art, a vehicle suspension device proposed in an embodiment of the present invention provides an electromagnetic current limiting component, which continuously and actively limits the current and the current limiting hole 8 under the condition of an external power supply, and can adjust the current limiting intensity, so that the active damping of the piston 7 in the oil chamber 5 can be electronically adjusted as needed. The supporting force and active damping between the first bracket 1 and the second bracket 2 can be changed as needed, thereby meeting the needs of a wider range of suspension usage scenarios, and the application of an external power supply is more in line with the development and transformation of new energy vehicles, thereby improving the practicality of the device.

[0033] As the preferred technical solution of this embodiment, the upper end of the telescopic column 4 is movably sleeved with a sleeve 9, the upper end of the guide column 6 is fixedly arranged in the sleeve 9, and the upper end of the sleeve 9 is hinged to the first bracket 1. Specifically, the sleeve 9 and the guide column 6 are coaxially arranged; the sleeve 9 is sleeved on the outside of the telescopic column 4 to play a protective function; the upper end of the sleeve 9 is connected to the first bracket 1 through two hinged connecting ears. Thus, the rotation of the sleeve 9 and the extension and retraction of the telescopic column 4 relative to the guide column 6 cooperate to achieve the free interference of the active stroke of each structure during the shock absorption process.

[0034] As a preferred technical solution of this embodiment, an elastic member 10 is provided between the upper end of the telescopic column 4 and the inner top surface of the sleeve 9. Specifically, the elastic member 10 can preferably be a spring, which is sleeved on the outside of the guide column 6. The setting of the elastic member 10 hinders the movement of the telescopic column 4 relative to the sleeve 9, thereby retaining a part of the traditional shock absorption function. By combining the traditional spring shock absorption with the oil damping shock absorption, it can further adapt to more suspension usage scenarios.

[0035] As the preferred technical solution of this embodiment, the electromagnetic current limiting component includes a pressure chamber 11 arranged in the piston 7, the pressure chamber 11 is cut off and arranged in the middle of the flow limiting hole 8, a magnetic pressure block 12 is movably arranged in the pressure chamber 11, and an electromagnetic unit for applying a reverse thrust to the magnetic pressure block 12 is arranged in the center of the piston 7. Specifically, the pressure chamber 11 is arranged near the middle of the flow limiting hole 8, and is closer to the center of the piston 7 relative to the flow limiting hole 8; one end of the pressure chamber 11 connected to the flow limiting hole 8 is spherical, and the other end is cylindrical; the flow limiting hole 8 is cut into two sections by the pressure chamber 11, and the flow limiting hole 8 at the cutoff is partially bent, thereby avoiding the two sections of the flow limiting hole 8 from passing directly; the shape of the magnetic pressure block 12 matches the pressure chamber 11, and its end close to the flow limiting hole 8 is also spherical, but the diameter of the sphere is slightly larger than the sphere at the corresponding end of the pressure chamber 11 shaped diameter, thus, when the magnetic pressure block 12 is in the position closest to the flow limiting hole 8, the pressure chamber 11 is not completely blocked; the two sections of the flow limiting holes 8 are connected through the space sandwiched between the pressure chamber 11 and the end of the magnetic pressure block 12 close to the flow limiting hole 8; a permanent magnet is arranged inside the magnetic pressure block 12, and the electromagnetic unit applies a reverse thrust to the magnetic pressure block 12 through the principle of like charges repelling each other; in actual use, by strengthening the magnetism generated by the electromagnetic unit, that is, strengthening the reverse thrust applied to the magnetic pressure block 12, the pressure of the space for oil circulation in the pressure chamber 11 is greater, the viscosity of the oil is enhanced under high pressure, and the fluidity is weakened, thereby reducing the rate of circulation through the flow limiting hole 8, thereby enhancing the activity damping of the piston 7 in the oil chamber 5, conversely, when the magnetism generated by the electromagnetic unit is weakened, the activity damping of the piston 7 in the oil chamber 5 is also weakened.

[0036] As a further preferred technical solution of this embodiment, a connecting hole 13 is provided through the magnetic pressure block 12. Specifically, the oil has extremely low compressibility, and the movement of the magnetic pressure block 12 in the pressure chamber 11 will change the total volume of the space occupied by the oil. The connecting hole 13 is provided so that it passes through the axis of the magnetic pressure block 12 and has a hole diameter smaller than the flow limiting hole 8. The connecting hole 13 is provided so that the pressure chambers 11 at both ends of the magnetic pressure block 12 are spatially connected, so that when the magnetic pressure block 12 moves again, the oil in the pressure chambers 11 at both ends of the magnetic pressure block 12 adjusts to each other, and the total volume of the space occupied by the oil does not change. In addition, the spatial volume of the pressure chamber 11 is fixed, and when the oil flows in the flow limiting hole 8, it is not easy for the oil to interact with the connecting hole 13.

[0037] As a further preferred technical solution of this embodiment, the electromagnetic unit includes an electric control circuit 14 arranged in the guide column 6, and a first electromagnet 15 is arranged at a position corresponding to the pressure chamber 11 on the electric control circuit 14. The first electromagnet 15 generates magnetism with opposite magnetic poles at one end close to the magnetic pressure block 12, and the electric control circuit 14 can adjust the magnetic strength of the first electromagnet 15. Specifically, a power converter is arranged inside the upper end of the sleeve 9, and the electric control circuit 14 is electrically connected to the power converter. The side wall of the sleeve 9 is provided with an interface of the power converter, which can be connected to an external power wire; the electric control circuit 14 is controlled by the vehicle-mounted system, and can realize the control of the current size and the switching of the current direction; under the control of the electric control circuit 14, the magnetic strength of the end of the first electromagnet 15 close to the magnetic pressure block 12 can be adjusted, and the magnetic pole can be switched.

[0038] Since the oil only interacts up and down through the flow-limiting hole 8, under the influence of repeated shock-absorbing impacts, the inner wall of the flow-limiting hole 8 is repeatedly rubbed, and tiny metal chips are generated. These metal chips are easily adsorbed by the magnetic pressure block 12, thereby causing blockage inside the pressure chamber 11. The following embodiment is proposed to solve this problem.

[0039] In another embodiment of the present invention, a demagnetization component for eliminating the magnetism of the magnetic pressure block 12 is provided in the piston 7. The electric control circuit 14 can control the switching of the polarity of the end of the first electromagnet 15. After the polarity of the end of the first electromagnet 15 is switched to attract the magnetic pressure block 12, the demagnetization component is triggered to temporarily weaken the magnetism on the magnetic pressure block 12. Specifically, the function of the electric control circuit 14 to switch the polarity of the first electromagnet 15 not only enables the first electromagnet 15 to apply thrust to the magnetic pressure block 12 to pressurize and adjust the oil flow space in the pressure chamber 11, thereby achieving the adjustment of the damping effect, The first electromagnet 15 can also apply suction to the magnetic pressure block 12 to keep the magnetic pressure block 12 close to the first electromagnet 15. At this time, the space for conducting oil in the pressure chamber 11 is the largest and the pressure is the smallest, so the damping force is the smallest, and the softest suspension can be formed. In addition, under the setting of the demagnetization component, when the magnetic pressure block 12 is close to the first electromagnet 15, the demagnetization component is triggered to greatly weaken the magnetism on the magnetic pressure block 12 and the adsorption force on metal chips. The metal washing liquid can leave the pressure chamber 11 under the flow of oil, eliminating the problem of blockage of the pressure chamber 11.

[0040] As a preferred technical solution of this embodiment, the demagnetization component includes a protrusion 16 provided on the magnetic pressure block 12, and a conductive contact 17 is provided on the protrusion 16. A movable groove 18 for the protrusion 16 to move is provided in the piston 7, and a discharge contact 19 matching the conductive contact 17 is provided on the inner wall of the movable groove 18. When the magnetic pressure block 12 is magnetically attracted to the first electromagnet 15, the conductive contact 17 contacts the discharge contact 19 to conduct electricity to the magnetic pressure block 12 and weaken its magnetism. Specifically, the protrusion 16 is limited to move in the movable groove 18, thereby ensuring that the movable stroke of the conductive contact 17 corresponds to the discharge contact 19; the discharge contact 19 is provided on the side of the movable groove 18 close to the first electromagnet 15; the conductive contact 17 is elastic; and the discharge contact 19 also remains energized when the electrical control circuit 14 remains connected to an external power supply. In actual use of this technical solution, the electric control circuit 14 remains energized. When the electric control circuit 14 controls the magnetic pole switching of the first electromagnet 15 to attract the magnetic pressure block 12, the magnetic pressure block 12 approaches the first electromagnet 15, and drives the protrusion 16 to move in the movable groove 18. The protrusion 16 drives the conductive contact 17 to approach and contact the discharge contact 19, thereby energizing the magnetic pressure block 12. Under the influence of the current, the magnetic field of the magnetic pressure block 12 is weakened, that is, the magnetism is weakened. As a result, the metal chips adsorbed on the surface of the magnetic pressure block 12 are easily carried away by the flow of oil, and the metal chips are not easily accumulated in the pressure chamber 11; and when the electric control circuit 14 controls the magnetic pole switching of the first electromagnet 15 and pushes the magnetic pressure block 12 again, the magnetic pressure block 12 drives the conductive contact 17 to separate from the discharge contact 19 to restore the magnetism, thereby ensuring the normal pressurization function.

[0041] However, after leaving the pressure chamber 11, the metal chips may not only return but also adhere to the inner wall of the oil chamber 5 or the piston 7 when mixed with the oil, thereby damaging the fitting surface between the oil chamber 5 and the piston 7, seriously affecting the service life of the damping mechanism. To solve this problem, the following embodiments are proposed.

[0042] In another embodiment of the present invention, a magnetic block 20 controlled by an electric control circuit 14 is rotatably provided on a portion of the guide post 6 close to the piston 7. The outer wall of the magnetic block 20 is curved to form a curved surface and is arranged corresponding to the direction of the opening of the flow limiting hole 8. Specifically, two magnetic blocks 20 are symmetrically arranged on the upper and lower sides of the piston 7; a second electromagnet 22 is provided at a position corresponding to the magnetic block 20 of the electric control circuit 14. A portion of the second electromagnet 22 protrudes from the outer wall of the guide post 6. The magnetic block 20 is sleeved on the guide post 6, and an annular groove is provided on the inner side to match and maintain contact with the second electromagnet 22. , thereby, the magnetic block 20 is limited on the guide column 6 and can rotate, and at the same time, the magnetic block 20 can maintain its magnetism when the electric control circuit 14 is energized; the oil discharged from the flow limiting hole 8 can be directly sprayed onto the curved surface of the magnetic block 20; when the oil containing metal chips is discharged through the flow limiting hole 8, this part of the oil will contact the curved surface of the magnetic block 20, causing the metal chips to be adsorbed to the surface of the magnetic block 20 at the first time, and will no longer be mixed into the oil and flow with it, thereby greatly avoiding the metal chips returning to the pressure chamber 11 and adhering to the inner wall of the oil chamber 5 or the piston 7.

[0043] As a preferred technical solution of this embodiment, a plurality of ribs 21 are provided on the circumference of the outer wall of the magnetic block 20. The extension surface of the ribs 21 is arranged at a certain angle to the surface where the busbar of the magnetic block 20 is located. Specifically, the surface of the magnetic block 20 is continuously sprayed with oil, which may cause some of the adsorbed debris to separate and mix into the oil again. To this end, by providing the ribs 21, grooves are formed between two adjacent ribs 21. After the debris enters the groove, it is blocked by the ribs 21, thereby playing a storage role and is not easy to separate. In addition, the ribs 2 1, so that the ribs 21 are approximately spiral-shaped, and when the surface of the magnetic block 20 is impacted by the jet of oil, the ribs 21 are stressed and the magnetic block 20 generates a torsional force, and the magnetic block 20 can be passively rotated, thereby making the grooves surrounded by the plurality of ribs 21 alternately receive the jet of the flow-limiting hole 8, thereby preventing metal chips from being adsorbed on the same position on the magnetic block 20, improving the adsorption capacity of the magnetic block 20, and more effectively preventing metal chips from floating in the oil, thereby greatly extending the service life of the damping component.

[0044] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A vehicle suspension device, comprising a first bracket (1) for connecting to a vehicle frame, a second bracket (2) hingedly connected to the lower end of the first bracket (1), a wheel axle (3) being provided on the second bracket (2), a damping mechanism being connected between the first bracket (1) and the second bracket (2), characterized in that: The damping mechanism comprises: A telescopic column (4) movably connected to the second bracket (2) and having an oil chamber (5) disposed therein; A guide column (6) is movably connected to the telescopic column (4), with its upper end extending out of the telescopic column (4) and hinged to the first bracket (1), and its lower end extending into the oil chamber (5) and fixedly provided with a piston (7), and a flow limiting hole (8) is provided on the piston (7) to communicate with its upper and lower sides; An electromagnetic current limiting component is arranged in the piston (7) and continuously limits the current of the current limiting hole (8) through an external power supply; The electromagnetic current limiting assembly includes a pressure chamber (11) arranged in the piston (7), the pressure chamber (11) is cut off and arranged in the middle of the current limiting hole (8), a magnetic pressure block (12) is movably arranged in the pressure chamber (11), and an electromagnetic unit for applying a reverse thrust to the magnetic pressure block (12) is arranged at the center of the piston (7); the electromagnetic unit includes an electric control circuit (14) arranged in the guide column (6), a first electromagnet (15) is arranged at a position corresponding to the pressure chamber (11) on the electric control circuit (14), the first electromagnet (15) generates magnetism with a magnetic pole opposite to that of the magnetic pressure block (12) at one end close to the magnetic pressure block (12), and the electric control circuit (14) can adjust the magnetic strength of the first electromagnet (15); The piston (7) is provided with a demagnetization component for eliminating the magnetism of the magnetic pressure block (12); the electric control circuit (14) can control the switching of the end polarity of the first electromagnet (15); after the end polarity of the first electromagnet (15) is switched to attract the magnetic pressure block (12), the demagnetization component is triggered to temporarily weaken the magnetism of the magnetic pressure block (12); the demagnetization component includes a protrusion (16) provided on the magnetic pressure block (12); the protrusion (16) is provided with a conductive contact (17); the piston (7) is provided with a movable groove (18) for the protrusion (16) to move; the inner wall of the movable groove (18) is provided with a discharge contact (19) matching the conductive contact (17); when the magnetic pressure block (12) is magnetically attracted to fit the first electromagnet (15), the conductive contact (17) contacts the discharge contact (19) to conduct electricity to the magnetic pressure block (12) and weaken its magnetism; A magnetic block (20) controlled by an electric control circuit (14) is rotatably provided on a portion of the guide column (6) close to the piston (7). The outer wall of the magnetic block (20) is curved to form a curved surface and is arranged to correspond to the direction of the opening of the flow limiting hole (8).

2. The vehicle suspension device according to claim 1, characterized in that: The upper end of the telescopic column (4) is movably sleeved with a sleeve (9), the upper end of the guide column (6) is fixedly arranged in the sleeve (9), and the upper end of the sleeve (9) is hinged to the first bracket (1).

3. The vehicle suspension device according to claim 2, characterized in that: An elastic member (10) is provided between the upper end of the telescopic column (4) and the inner top surface of the sleeve (9).

4. The vehicle suspension device according to claim 1, wherein: The magnetic pressure block (12) is provided with a communication hole (13) extending therethrough.

5. The vehicle suspension device according to claim 1, wherein: A plurality of convex ribs (21) are provided on the circumference of the outer wall of the magnetic attraction block (20), and the extension surface of the convex ribs (21) is arranged at a certain angle to the surface where the busbar of the magnetic attraction block (20) is located.

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