Single-cylinder type double-outlet-rod magneto-rheological shock absorber and vehicle

Abstract

The single-cylinder type double-outlet-rod magnetorheological damper comprises an outer cylinder, a spring plate, a stabilizer bar support and a support support are sequentially arranged on the outer cylinder from top to bottom, an upper guider and a lower guider are arranged in the outer cylinder, and a piston assembly is arranged between the upper guider and the lower guider. The outer cylinder is sequentially divided into a compensation outer cavity, a first circulation cavity and a second circulation cavity by the upper guider, the piston assembly and the lower guider, the first circulation cavity and the second circulation cavity are filled with magnetorheological fluid, and the compensation outer cavity is communicated with the outside; two ends of the piston assembly are respectively connected with an upper piston rod and a lower piston rod; a cable is arranged in the upper piston rod; in the damping telescopic motion, the total volume of rod bodies, located in the first circulation cavity and the second circulation cavity, of the upper piston rod and the lower piston rod is not changed, and the problems that an existing magneto-rheological damper is complex in overall structure, a floating piston and filling gas are needed, and extra heat is easily generated through friction after long-time use are solved.

Description

Technical Field

[0001] The invention relates to the field of automobile shock absorbing equipment, in particular to a single-tube double-rod magnetorheological shock absorber. Background Art

[0002] Electromagnetic suspension, also known as magnetorheological shock absorber, is different from ordinary shock absorbers in that the shock absorber is not filled with compressed gas or oil, but a substance called magnetorheological fluid. Magnetorheological fluid is composed of magnetized soft iron particles suspended in synthetic hydroxyl liquid and can be controlled by an external magnetic field.

[0003] For example, the patent document with the existing patent number CN202010812590.3 discloses a magnetorheological shock absorber, including a lower hanging ring, a valve core, a first sealing ring, a liquid storage cylinder, a second sealing ring, a heat-conducting cylinder, a piston rod dust cover, a piston, a floating piston, magnetic fluid and nitrogen. The valve core is fixedly installed on the side wall of the lower hanging ring, the first sealing ring is installed between the lower hanging ring and the valve core, the upper end of the lower hanging ring is threadedly connected to the liquid storage cylinder, the second sealing ring is installed at the joint of the liquid storage cylinder and the lower hanging ring, the outer side of the liquid storage cylinder is fixedly connected to the heat-conducting cylinder, the upper end of the liquid storage cylinder is threadedly connected to the piston rod dust cover, the piston is slidably connected in the liquid storage cylinder, the floating piston is slidably connected in the liquid storage cylinder, the space between the floating piston and the piston is filled with magnetic fluid, and the space between the floating piston and the lower hanging ring is filled with nitrogen.

[0004] However, the above-mentioned magnetorheological liquid shock absorber adopts a floating piston, and nitrogen needs to be flushed inside. The overall structure increases, resulting in increased equipment requirements, complex installation, and increased costs. The floating piston needs to continuously float up and down during the shock absorption process, resulting in frictional heat between the piston and the cylinder body. In addition, the above-mentioned structure also adds a heat conduction device, which further increases the overall complexity and cost. In order to solve the above problems, simplify the overall structure of the magnetorheological shock absorber, reduce the overall cost, and solve the problem of frictional heat, a single-tube double-rod magnetorheological shock absorber is designed. Summary of the Invention

[0005] The purpose of the present invention is to provide a single-tube double-rod magnetorheological shock absorber, aiming to improve the problems of existing magnetorheological shock absorbers, such as complex overall structure, the need for a floating piston and filling gas, and the easy generation of extra heat by friction during long-term use.

[0006] The present invention is achieved as follows: a single-tube, dual-rod magnetorheological shock absorber includes an outer cylinder, the outer cylinder being provided with a spring disc, a stabilizer rod bracket, and a support bracket in order from top to bottom; an upper guide and a lower guide being provided in the outer cylinder; a piston assembly being provided between the upper and lower guides; the outer cylinder being partitioned into a compensation outer chamber, a first flow chamber, and a second flow chamber by the upper guide, the piston assembly, and the lower guide in order; the first and second flow chambers being filled with magnetorheological fluid; and the compensation outer chamber being in communication with the exterior.

[0007] The two ends of the piston assembly are respectively connected to an upper piston rod and a lower piston rod, the upper piston rod is slidably connected to the upper guide, and the lower piston rod is slidably connected to the lower guide, and a cable is provided in the upper piston rod;

[0008] During the shock-absorbing telescopic movement, the total volume of the rod bodies of the upper piston rod and the lower piston rod in the first circulation chamber and the second circulation chamber remains unchanged.

[0009] As an embodiment of the present invention, two limiting grooves are provided on the inner wall of the outer cylinder, a wire retaining ring is provided in each limiting groove, and the upper guide and the lower guide are respectively clamped on the corresponding wire retaining ring.

[0010] As one embodiment of the present invention, the above-mentioned upper guide and lower guide are symmetrically arranged, and the structure of the above-mentioned lower guide is the same as that of the upper guide. The above-mentioned upper guide includes a cylindrical outer shell, a bearing cavity is provided in the above-mentioned cylindrical outer shell, a bearing is provided in the above-mentioned bearing cavity, the above-mentioned bearing sleeve is arranged on the upper piston rod, and multiple sealing rings are provided between the outer wall of the above-mentioned upper guide and the inner wall of the outer cylinder.

[0011] As one embodiment of the present invention, the two end faces of the above-mentioned bearing are respectively provided with a first oil seal assembly and a second oil seal assembly, and the outer end face of the above-mentioned upper guide is also provided with an outer oil seal assembly. The above-mentioned first oil seal assembly, second oil seal assembly and outer oil seal assembly are sequentially sleeved on the upper piston rod from the inside to the outside.

[0012] As an embodiment of the present invention, an anti-rebound elastic support member is provided on the end surface of the upper guide close to the piston assembly.

[0013] As one embodiment of the present invention, the above-mentioned piston assembly includes a piston outer shell and a magnetic inner core, the above-mentioned magnetic inner core is located in the above-mentioned piston outer shell, and an upper pressure plate and a lower pressure plate are respectively provided at both ends of the above-mentioned magnetic inner core, the above-mentioned upper pressure plate and the above-mentioned upper piston rod are fixedly connected, the above-mentioned lower pressure plate and the above-mentioned lower piston rod are fixedly connected, the upper pressure plate and the lower pressure plate are clamped and fixed on the piston outer shell, and the above-mentioned cable passes through the above-mentioned upper pressure plate and the above-mentioned magnetic inner core to be electrically connected.

[0014] As one embodiment of the present invention, the inner diameter of the magnetic inner core is smaller than the inner diameter of the piston outer shell, and a plurality of flow holes are provided on the upper and lower pressure plates. The magnetic inner core includes an insulating cast body and a coil.

[0015] As an embodiment of the present invention, the spring disc is provided with a plurality of connection holes for connecting to vehicle springs, and the inner diameter of the outer cylinder is 36 mm-54 mm.

[0016] As an embodiment of the present invention, the above-mentioned support bracket includes an outer mounting bracket and an inner mounting bracket. The above-mentioned outer mounting bracket is sleeved on the outer cylinder, and the above-mentioned inner mounting bracket is clamped and fixed on the outer mounting bracket. The outer mounting bracket is also provided with a wiring harness bracket and an oil pipe bracket.

[0017] A vehicle uses the above-mentioned single-tube double-rod magnetorheological shock absorber.

[0018] The beneficial effects brought by the present invention are:

[0019] 1. The present invention is provided with two sets of guides and two piston rods. The double-rod design ensures that the total volume of the piston rod remains unchanged during the extension and retraction process, thereby avoiding the pressure fluctuation caused by volume change of traditional shock absorbers and further optimizing the shock absorption effect.

[0020] 2. The present invention sets a lower piston rod, eliminates the floating piston and the nitrogen-filled cylinder, and the single-tube structure simplifies the overall structure of the shock absorber, reduces the number of parts, and reduces manufacturing costs and assembly difficulty.

[0021] 3. The present invention effectively prevents the leakage of magnetorheological fluid and the intrusion of external impurities by arranging multiple sealing rings on the upper guide and the lower guide, and arranging oil seal assemblies on the bearing end face and the outer end face, thereby ensuring the long-term stable operation of the shock absorber.

[0022] 4. Anti-rebound design improves safety: The anti-rebound elastic support provided on the end face of the upper guide close to the piston assembly effectively suppresses the rebound phenomenon of the shock absorber after a severe impact, thereby enhancing the stability and safety of the vehicle during driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention and to make other features, purposes and characteristics of the present invention more apparent. The accompanying drawings and descriptions of the exemplary embodiments of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0024] Figure 1 It is a first structural schematic diagram of the present invention as a whole;

[0025] Figure 2 It is a second structural schematic diagram of the present invention as a whole;

[0026] Figure 3 It is a cross-sectional view of the internal structure of the present invention;

[0027] Figure 4 It is an overall cross-sectional schematic diagram of the present invention;

[0028] Figure 5 This invention Figure 4 A magnified view of the structure of part A;

[0029] Figure 6 It is a structural schematic diagram of the upper guide of the present invention;

[0030] Figure 7 It is a structural schematic diagram of the piston assembly of the present invention;

[0031] Figure 8 It is a schematic cross-sectional view of the assembly structure of the piston assembly of the present invention;

[0032] Figure 9 This invention Figure 8 A magnified view of some structures in ;

[0033] In the figure: compensating outer cavity 100; first circulation cavity 200; second circulation cavity 300; outer cylinder 1; limiting groove 10; wire retaining ring 101; spring disk 11; connecting hole 110; stabilizer bar bracket 12; support bracket 13; outer mounting bracket 131; inner mounting bracket 132; wiring harness bracket 133; oil pipe bracket 134; upper piston rod 2; lower piston rod 3; upper guide 4; bearing cavity 40; cylindrical outer shell 41; bearing 42; first oil seal assembly 421; second oil seal assembly 422; sealing ring 43; outer oil seal assembly 44; anti-rebound elastic support member 45; lower guide 5; piston assembly 6; circulation hole 60; piston outer shell 61; magnetic inner core 62; insulating casting body 621; coil 622; upper pressure plate 63; lower pressure plate 64; cable 7. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] Example 1

[0037] As shown in the existing magnetorheological shock absorber with patent number CN202010812590.3, the upper piston rod 2 is connected to the vehicle body. When the vehicle encounters an obstacle, the tire will transmit the force acting on it to the outer cylinder 1, causing the outer cylinder 1 and the piston assembly 6 to move. At this time, the piston assembly 6 moves up and down between the first circulation chamber 200 and the second circulation chamber 300, that is, the charged coil cuts the magnetic lines of force in the magnetic field, generates a reverse magnetic field, and provides a magnetic force opposite to the vibration force to offset and reduce the force.

[0038] In the traditional single-rod + piston method, due to the up and down movement of the single-rod body, the total volume of the first circulation chamber 200 and the second circulation chamber 300 changes as the rod body moves in and out. Therefore, a floating piston method is added, but this structure adds additional costs, and the added floating piston needs to be sealed with the cylinder body 1 to prevent leakage of magnetorheological fluid. The friction between the floating piston and the cylinder body 1 is large, and it will move up and down during use, causing additional heat. The floating piston and the cylinder body are easily damaged by wear.

[0039] In order to solve these problems and ensure that the volume between the first circulation chamber 200 and the second circulation chamber 300 does not change during the shock-absorbing telescopic movement, the design of the floating piston is eliminated, thereby reducing costs, wear and heat.

[0040] like Figure 1-9 As shown, the present invention provides a single-tube double-rod magnetorheological shock absorber, and its specific implementation is as follows:

[0041] like Figure 1-2 The figure shows a single-tube, dual-rod magnetorheological shock absorber, comprising an outer cylinder 1, which is sequentially equipped with a spring plate 11, a stabilizer bar bracket 12, and a support bracket 13 from top to bottom. The outer cylinder 1 is made of high-strength alloy steel, has an inner diameter of 36mm-54mm, and a wall thickness designed according to load requirements. The spring plate 11, stabilizer bar bracket 12, and support bracket 13 are welded to the outer surface of the outer cylinder 1, sequentially from top to bottom.

[0042] A plurality of connection holes 110 are provided on the top of the spring disk 11 for fixing the vehicle spring.

[0043] The support bracket 13 comprises an outer mounting bracket 131 and an inner mounting bracket 132. The outer mounting bracket 131 is generally tubular and is welded onto the outer cylinder 1. The inner mounting bracket 132 is locked to the outer mounting bracket 131 via a snap-fit mechanism. The outer mounting bracket 131 also incorporates a wiring harness bracket 133 and an oil pipe bracket 134 for securing cables and hydraulic lines.

[0044] like Figure 3-4 As shown, the main improvement of the present invention is to set two groups of guides and two piston rods, specifically, an upper guide 4 and a lower guide 5 are provided in the outer cylinder 1, two limiting grooves 10 are provided on the inner wall of the outer cylinder 1, and a wire retaining ring 101 is provided in each limiting groove 10, and the upper guide 4 and the lower guide 5 are respectively clamped on the corresponding wire retaining ring 101. By processing two annular limiting grooves 10 on the inner wall of the outer cylinder 1 and installing the wire retaining ring 101 in the groove, the positions of the upper guide 4 and the lower guide 5 are fixed. In the present invention, the structures of the upper guide 4 and the lower guide 5 are exactly the same and are symmetrically arranged. The ends of the upper guide 4 and the lower guide 5 are respectively clamped on the corresponding wire retaining ring 101 to achieve axial positioning and fixation of the upper guide 4 and the lower guide 5.

[0045] like Figure 3-6 As shown, the upper guide 4 and the lower guide 5 are symmetrically arranged, and the structure of the lower guide 5 is the same as that of the upper guide 4. The upper guide 4 includes a cylindrical outer shell 41, a bearing cavity 40 is provided in the cylindrical outer shell 41, a bearing 42 is provided in the bearing cavity 40, and the bearing 42 is sleeved on the upper piston rod 2. A plurality of sealing rings 43 are provided between the outer wall of the upper guide 4 and the inner wall of the outer cylinder 1.

[0046] The present invention provides a lower piston rod, eliminates the floating piston and the nitrogen-filled cylinder, and the single-tube structure simplifies the overall structure of the shock absorber, reduces the number of parts, and reduces manufacturing costs and assembly difficulty.

[0047] The upper guide 4 includes a cylindrical outer shell 41, a bearing cavity 40 is provided inside the outer shell, and a bearing 42 is arranged in the cavity. The bearing 42 is sleeved on the upper piston rod 2 to reduce the friction during the linear motion of the piston rod.

[0048] At the same time, in order to prevent leakage of the magnetorheological fluid, a plurality of sealing rings 43 are installed in the external area, that is, between the outer wall of the upper guide 4 and the inner wall of the outer cylinder 1 .

[0049] At the connection between the bearing 42 and the upper piston rod 2, that is, the two end faces of the bearing 42 are respectively provided with a first oil seal assembly 421 and a second oil seal assembly 423. In order to further improve the sealing effect, an outer oil seal assembly 44 is also provided on the outer end face of the upper guide 4. The first oil seal assembly 421, the second oil seal assembly 423 and the outer oil seal assembly 44 are sequentially sleeved on the upper piston rod 2 from the inside to the outside.

[0050] The first oil seal assembly 421 and the second oil seal assembly 423 are respectively installed on the two end surfaces of the bearing 42, and an outer oil seal assembly 44 is added to the outer end surface of the upper guide 4. The three are arranged in sequence from the inside to the outside along the upper piston rod 2 to form a multi-stage seal, so that the upper piston rod 2 always maintains a seal with the outside world during the up and down movement.

[0051] The present invention effectively prevents leakage of magnetorheological fluid and intrusion of external impurities by arranging multiple sealing rings on the upper guide and the lower guide, and arranging oil seal assemblies on the bearing end face and the outer end face, thereby ensuring long-term stable operation of the shock absorber.

[0052] To prevent the piston assembly 6 from violent up and down movement, which could damage the upper and lower guides 4 and 5, anti-rebound elastic supports 45 are installed on the end surfaces of the upper and lower guides 4 and 5 near the piston assembly 6. These supports 45 can be made of polyurethane cushions to absorb the impact of piston rebound. This anti-rebound design improves safety: The anti-rebound elastic supports installed on the end surfaces of the upper guides near the piston assembly effectively suppress rebound of the shock absorber after a violent impact, enhancing vehicle stability and safety during driving.

[0053] A piston assembly 6 is provided between the upper guide 4 and the lower guide 5. The outer cylinder 1 is sequentially divided into a compensating outer chamber 100, a first circulation chamber 200 and a second circulation chamber 300 by the upper guide 4, the piston assembly 6 and the lower guide 5. The first circulation chamber 200 and the second circulation chamber 300 are filled with magnetorheological fluid, and the compensating outer chamber 100 is connected to the outside; the piston assembly 6 is located between the upper guide 4 and the lower guide 5, and includes a piston outer shell 61 and a magnetic inner core 62.

[0054] like Figure 7-9 As shown, the two ends of the piston assembly 6 are respectively connected to the upper piston rod 2 and the lower piston rod 3, the upper piston rod 2 is slidably connected to the upper guide 4, and the lower piston rod 3 is slidably connected to the lower guide 5, and a cable 7 is provided in the upper piston rod 2.

[0055] The outer cylinder 1 is divided into three cavities by the upper guide 4, the piston assembly 6 and the lower guide 5.

[0056] Dual-rod volume balance: As the upper and lower piston rods (2) and (3) extend and retract, the volume changes within the cavity offset each other, ensuring a constant total volume. This eliminates the need for floating pistons and nitrogen filling, simplifying the product structure. The dual-rod design ensures a constant total volume during expansion and contraction, avoiding the pressure fluctuations associated with volume changes in traditional shock absorbers and further optimizing the damping effect.

[0057] Cavity working principle:

[0058] The upper and lower piston rods 2 and 3 have identical diameters and contours. The lower piston rod 3 is provided to spatially compensate for the movement of the upper piston rod 2. When the upper piston rod 2 moves downward, generating positive pressure and squeezing the first and second circulation chambers 200 and 300, the lower piston rod 3 moves downward by the same length, offsetting the pressure from the upper piston rod 2. Similarly, when the upper piston rod 2 moves upward, generating negative pressure on the first and second circulation chambers 200 and 300, the lower piston rod 3 moves upward by the same length, compensating for the negative pressure generated by the upper piston rod 2. Therefore, during the overall upward and downward movement of the piston assembly 6 and the upper and lower piston rods 2 and 3, the total volume of the magnetorheological fluid within the first and second circulation chambers 200 and 300 remains unchanged. Similarly, during the shock-absorbing telescopic movement, the total volume of the upper and lower piston rods 2 and 3 within the first and second circulation chambers 200 and 300 remains unchanged.

[0059] The piston assembly 6 includes a piston outer shell 61 and a magnetic inner core 62. The magnetic inner core 62 is located inside the piston outer shell 61. An upper pressure plate 63 and a lower pressure plate 64 are respectively provided at both ends of the magnetic inner core 62. The upper pressure plate 63 is fixedly connected to the upper piston rod 2, and the lower pressure plate 64 is fixedly connected to the lower piston rod 3. At the same time, the upper pressure plate 63 and the lower pressure plate 64 are clamped and fixed on the piston outer shell 61.

[0060] The cable 7 passes through the upper pressing plate 63 and is electrically connected to the magnetic inner core 62 .

[0061] The inner diameter of the magnetic inner core 62 is smaller than the inner diameter of the piston outer shell 61 , and a plurality of flow holes 60 are provided on the upper pressing plate 63 and the lower pressing plate 64 . The magnetic inner core 62 includes an insulating casting 621 and a coil 622 .

[0062] The magnetic inner core 62 is composed of an insulating casting 621 wrapped with a coil 622. The coil 622 is connected to an external controller via a cable 7 in the upper piston rod 2. The insulating casting 621 can be epoxy resin.

[0063] The outer diameter of the inner core is smaller than the inner diameter of the piston outer shell 61. The two ends of the magnetic inner core 62 are fixed by an upper pressing plate 63 and a lower pressing plate 64. A plurality of flow holes 60 are opened on the pressing plate to allow the magnetorheological fluid to flow in both directions to form an annular flow channel.

[0064] The first circulation chamber 200 and the second circulation chamber 300 are filled with magnetorheological fluid, and the two chambers are connected through the annular flow channel of the piston outer shell 61 and the pressure plate circulation hole 60.

[0065] The compensation outer chamber 100 is communicated with the atmosphere and is used to place the lower piston rod 3 so as to compensate for the volume change of the upper piston rod.

[0066] The upper pressing plate 63 is threadedly connected to the upper piston rod 2 , and the lower pressing plate 64 is fixed to the lower piston rod 3 by welding.

[0067] The shock absorber is connected to the suspension spring via the spring plate 11, and the support bracket 13 is fixed to the vehicle body or axle. During operation, the controller adjusts the current of the coil 622 according to the road conditions, changes the viscosity of the magnetorheological fluid, and adjusts the damping force in real time.

[0068] A vehicle utilizes the aforementioned single-tube, dual-rod magnetorheological shock absorber. This shock absorber is suitable for a variety of vehicle types, from passenger cars to commercial vehicles. The outer tube's inner diameter and connection hole layout can be adjusted to meet the installation requirements of different vehicles. Its excellent shock-absorbing performance also promises broad application prospects in high-end and special-purpose vehicles. This embodiment balances structural reliability and responsiveness, making it suitable for high-performance automotive suspension systems.

[0069] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0070] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A single-tube double-rod magnetorheological shock absorber, characterized in that: The invention comprises an outer cylinder (1), wherein the outer cylinder (1) is provided with a spring disk (11), a stabilizer rod bracket (12) and a support bracket (13) in sequence from top to bottom; an upper guide (4) and a lower guide (5) are provided in the outer cylinder (1); a piston assembly (6) is provided between the upper guide (4) and the lower guide (5); the outer cylinder (1) is sequentially divided into a compensation outer chamber (100), a first circulation chamber (200) and a second circulation chamber (300) by the upper guide (4), the piston assembly (6) and the lower guide (5); the first circulation chamber (200) and the second circulation chamber (300) are filled with magnetorheological fluid; and the compensation outer chamber (100) is connected to the outside; The two ends of the piston assembly (6) are respectively connected to an upper piston rod (2) and a lower piston rod (3), the upper piston rod (2) is slidably connected to the upper guide (4), the lower piston rod (3) is slidably connected to the lower guide (5), and a cable (7) is provided in the upper piston rod (2); During the shock-absorbing telescopic movement, the total volume of the rod bodies of the upper piston rod (2) and the lower piston rod (3) in the first circulation chamber (200) and the second circulation chamber (300) remains unchanged.

2. The single-tube double-rod magnetorheological shock absorber according to claim 1, characterized in that: Two limiting grooves (10) are provided on the inner wall of the outer cylinder (1), and a steel wire retaining ring (101) is provided in each limiting groove (10). The upper guide (4) and the lower guide (5) are respectively clamped on the corresponding steel wire retaining ring (101).

3. The single-tube double-rod magnetorheological shock absorber according to claim 2, characterized in that: The upper guide (4) and the lower guide (5) are symmetrically arranged, and the structure of the lower guide (5) is the same as that of the upper guide (4). The upper guide (4) includes a cylindrical outer shell (41), a bearing cavity (40) is arranged in the cylindrical outer shell (41), a bearing (42) is arranged in the bearing cavity (40), and the bearing (42) is sleeved on the upper piston rod (2). A plurality of sealing rings (43) are arranged between the outer wall of the upper guide (4) and the inner wall of the outer cylinder (1).

4. The single-tube double-rod magnetorheological shock absorber according to claim 3, characterized in that: The two end surfaces of the bearing (42) are respectively provided with a first oil seal assembly (421) and a second oil seal assembly (422); the outer end surface of the upper guide (4) is also provided with an outer oil seal assembly (44); the first oil seal assembly (421), the second oil seal assembly (422) and the outer oil seal assembly (44) are sequentially sleeved on the upper piston rod (2) from the inside to the outside.

5. The single-tube double-rod magnetorheological shock absorber according to claim 4, characterized in that: An anti-rebound elastic support member (45) is provided on the end surface of the upper guide (4) close to the piston assembly (6).

6. The single-tube double-rod magnetorheological shock absorber according to claim 1, characterized in that: The piston assembly (6) includes a piston outer shell (61) and a magnetic inner core (62), wherein the magnetic inner core (62) is located in the piston outer shell (61), and an upper pressure plate (63) and a lower pressure plate (64) are respectively provided at both ends of the magnetic inner core (62), wherein the upper pressure plate (63) and the upper piston rod (2) are fixedly connected, and the lower pressure plate (64) and the lower piston rod (3) are fixedly connected, and the upper pressure plate (63) and the lower pressure plate (64) are snap-fitted and fixed to the piston outer shell (61), and the cable (7) passes through the upper pressure plate (63) and is electrically connected to the magnetic inner core (62).

7. The single-tube double-rod magnetorheological shock absorber according to claim 6, characterized in that: The inner diameter of the magnetic inner core (62) is smaller than the inner diameter of the piston outer shell (61), and a plurality of flow holes (60) are provided on the upper pressing plate (63) and the lower pressing plate (64). The magnetic inner core (62) includes an insulating cast body (621) and a coil (622).

8. The single-tube double-rod magnetorheological shock absorber according to claim 1, characterized in that: The spring disc (11) is provided with a plurality of connection holes (110) for connecting with vehicle springs, and the inner diameter of the outer cylinder (1) is 36 mm to 54 mm.

9. The single-tube double-rod magnetorheological shock absorber according to claim 1, characterized in that: The support bracket (13) comprises an outer mounting bracket (131) and an inner mounting bracket (132); the outer mounting bracket (131) is sleeved on the outer cylinder (1); the inner mounting bracket (132) is clamped and fixed on the outer mounting bracket (131); and the outer mounting bracket (131) is further provided with a wiring harness bracket (133) and an oil pipe bracket (134).

10. A vehicle, characterized in that: Use the single-tube double-rod magnetorheological shock absorber as described in any one of claims 1 to 9 above.

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