Magneto-rheological shock absorber

Abstract

The magnetorheological damper comprises a cylinder barrel, a floating piston and a piston rod assembly, the floating piston and the piston rod assembly are located in the cylinder barrel, the floating piston is located below the piston rod assembly, the piston rod assembly comprises a piston rod, a guider outer sleeve, a buffer block, an upper pressing plate, an electromagnetic coil, a piston outer sleeve and a lower pressing plate, and a limiting flange extending inwards in the radial direction is arranged at the upper end of the cylinder barrel; the limiting turnup abuts against the upper end face of the guider outer sleeve, and the limiting turnup at the upper end of the cylinder barrel is matched with the guider outer sleeve, so that the problem that a steel cable baffle ring in a traditional shock absorber is prone to disengagement is solved. The limiting turnup directly presses the guider outer sleeve to form rigid limiting, and the risk that the guider outer sleeve is separated from the cylinder barrel due to impact is avoided. By means of the structural optimization, the stability of the shock absorber under the working condition of large impact is remarkably improved, the shock absorber is particularly suitable for complex road conditions of cross-country vehicles, the pull-off failure probability is reduced, and vehicle safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shock absorber technical field especially relates to a magneto rheological shock absorber. BACKGROUND

[0002] As a kind of intelligent damping device, magneto rheological shock absorber changes the rheological property of magneto rheological fluid by adjusting the current of electromagnetic coil, to realize the dynamic control of damping force, and is widely used in vehicle suspension system to improve ride comfort and safety. However, under complex road conditions (such as off-road scene), shock absorber often faces large impact load, and the reliability of recovery limiting structure becomes a key factor restricting performance.

[0003] The recovery limiting structure of traditional magneto rheological shock absorber is mainly composed of upper pressing plate, buffer block, guide sleeve, hole steel wire retainer, cylinder and piston rod and other components. In the prior art, the upper pressing plate is made of aluminum alloy 6061 material, the buffer block is made of high-density rubber material, and the guide sleeve and the cylinder are connected by the hole steel wire retainer. Although such design can complete the limiting action, there are significant defects under large impact working condition:

[0004] Insufficient material strength: the shear resistance of aluminum alloy upper pressing plate is limited, and it is easy to deform or even break under long-term impact; the rubber buffer block is easy to twist, split or fatigue aging under high-frequency impact, resulting in limiting failure.

[0005] Structural design defects: the contact surface of buffer block and upper pressing plate is easy to cause stress concentration due to self-contact, and the buffer block may block the gap between flow channels after impact, causing the locking failure of shock absorber; the steel wire retainer is easy to fatigue fracture or fall out due to unreasonable slot structure, causing the separation of guide sleeve and cylinder.

[0006] The above problems are particularly prominent in off-road vehicles and other large impact scenarios, and the pull-out failure of shock absorber not only affects the vehicle control stability, but also may cause serious safety accidents. Although the existing technology tries to improve the reliability by optimizing the material or local structure, it still cannot fundamentally solve the problems of pull-out risk and insufficient durability. UTILITY MODEL CONTENTS

[0007] The utility model aims at providing a magneto rheological shock absorber which is stable in work and suitable for complex road conditions of off-road vehicles.

[0008] In order to achieve the above purpose, the utility model adopts the following technical scheme: a magneto rheological shock absorber, comprising a cylinder, a floating piston and a piston rod assembly located in the cylinder, the floating piston is located below the piston rod assembly, the piston rod assembly comprises a piston rod, a guide sleeve, a buffer block, an upper pressing plate, an electromagnetic coil, a piston sleeve and a lower pressing plate, the cylinder is provided with a limiting flange extending radially inward at the upper end, and the limiting flange abuts against the upper end face of the guide sleeve.

[0009] In one embodiment, the lower end of the buffer block is provided with a downwardly extending buffer protrusion that abuts against the upper end face of the upper pressing plate.

[0010] In one embodiment, the upper end face of the upper pressing plate is provided with an inwardly inclined guide slope that forms a dynamic fit with the lower end face of the buffer protrusion.

[0011] In one embodiment, the inclination angle of the guide slope is 2°-6°.

[0012] In one embodiment, a gap is provided between the lower end face of the buffer protrusion and the guide slope, and the gap value is 0.2mm-0.5mm.

[0013] In one embodiment, the shape of the buffer protrusion is trapezoidal or arc-shaped.

[0014] In one embodiment, a steel wire retainer ring is provided between the upper end edge of the guide sleeve and the cylinder barrel, and the steel wire retainer ring is blocked by a limiting flange.

[0015] In one embodiment, the limiting flange is integrally formed with the cylinder barrel and is made by a concave flanging process.

[0016] In one embodiment, the upper pressing plate is a titanium-aluminum alloy upper pressing plate; and / or, the lower pressing plate is a titanium-aluminum alloy lower pressing plate.

[0017] In one embodiment, the electromagnetic coil is wound by a flat wire enameled wire.

[0018] After adopting the above technical solution, the utility model has the following advantages:

[0019] 1. In the utility model, the limiting flange at the upper end of the cylinder barrel cooperates with the guide sleeve to solve the problem of easy detachment of the steel wire retainer ring in the traditional shock absorber. The limiting flange directly presses the guide sleeve to form rigid limiting, avoiding the risk of separation of the guide sleeve from the cylinder barrel due to impact. This structural optimization significantly improves the stability of the shock absorber under large impact conditions, especially suitable for complex road conditions of off-road vehicles, reduces the probability of pull-out failure, and ensures the safety of the vehicle.

[0020] 2. The buffer protrusion is provided to uniformly disperse impact stress, avoiding the distortion or splitting problem of the traditional buffer block caused by self-contact, and the protruding structure can uniformly fill the limiting interval during impact, disperse stress concentration, improve impact resistance, reduce the risk of material fatigue caused by fracture, and further improve the reliability of the shock absorber.

[0021] 3. The dynamic cooperation between the guide slope of the upper pressing plate and the buffer protrusion allows the buffer block to move inward under the impact force instead of expanding outward. This design prevents the buffer block from blocking the gap between the flow channels, causing the shock absorber to fail to close. With the support of the piston rod, the risk of large deformation of the buffer block is reduced, ensuring the continuous and stable operation of the shock absorber under high-frequency impact.

[0022] 4. By setting the inclination angle of the guide slope within the range of 2° to 6°, the buffer block can be effectively guided to move inward, while avoiding stress concentration caused by excessive angle. This angle range balances the structural strength and guiding efficiency, ensuring the smooth resetting of the buffer block during impact, reducing wear on the guide slope, and further improving the durability of the shock absorber.

[0023] 5. By designing the gap within the range of 0.2mm to 0.5mm, the buffer block is allowed to deform freely at the initial stage of impact to absorb energy, while avoiding delay in the transmission of impact force caused by excessive gap. This gap optimizes the precision of the buffer block and the guide slope, ensuring the responsiveness and non-interference of the shock absorber, and improving the energy dissipation efficiency.

[0024] 6. By setting the buffer protrusion in a trapezoidal or arc shape and verifying through CAE simulation analysis, the trapezoidal structure evenly disperses impact stress by increasing the contact area, avoiding the edge stress concentration problem of traditional rectangular protrusions. The arc structure conforms to the material deformation trend under stress, reducing the rigid collision between the buffer block and adjacent components during impact. Both shapes effectively prevent defects such as distortion, intrusion, or splitting of the buffer block caused by self-contact, ensuring its full filling within the limit range and improving energy absorption efficiency. Combined with simulation optimization, this design significantly reduces the fatigue fracture risk of the buffer block under high-frequency impact, prolongs the service life, and enhances the overall anti-deformation ability of the shock absorber under large impact conditions, ensuring the reliability and stability of the limiting action.

[0025] 7. The double limiting structure formed by the steel wire retainer ring combined with the limiting flange avoids the deformation or fatigue fracture problem of traditional retainer rings. This design enhances the shear resistance of the retainer ring, ensuring the stable connection between the guide sleeve and the cylinder, and further improves the upper limit of the pull-off force of the shock absorber assembly.

[0026] 8. The integrated concave flange process of the cylinder and the limiting flange avoids the strength defects of traditional welding or split structure. The one-piece structure significantly improves the local compressive strength of the cylinder, ensuring the stability and reliability of the limiting action of the guide sleeve, while simplifying the manufacturing process and reducing the process cost.

[0027] 9. The titanium-aluminum alloy upper / lower pressure plates have higher strength and shear resistance, and can withstand greater impact loads within the same volume. Compared with traditional aluminum alloy 6061, its fatigue resistance and corrosion resistance are significantly improved, extending the service life of the pressure plates, making it especially suitable for off-road conditions with high frequency and high impact.

[0028] 10. Electromagnetic coils wound with flat enameled wire significantly improve the damping force adjustment range by increasing the effective working length and current density. Compared with traditional round wire coils, their electromagnetic efficiency is increased by 10-20%, and their power consumption is lower for the same damping force. At the same time, they enhance the response speed and control accuracy of the vibration damper, making them suitable for scenarios with higher dynamic performance requirements. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] Figure 1 This is a cross-sectional view of the magnetorheological vibration damper described in this utility model.

[0031] Figure 2 for Figure 1 A magnified view of A in the middle.

[0032] Figure 3 for Figure 2 A magnified view of B in the middle.

[0033] The names of the components shown in the diagram are as follows:

[0034] 1. Cylinder; 11. Limiting flange; 2. Floating piston; 3. Piston rod; 4. Guide sleeve; 5. Buffer block; 51. Buffer protrusion; 6. Upper pressure plate; 61. Guide slope; 7. Electromagnetic coil; 8. Piston sleeve; 9. Lower pressure plate; 10. Steel wire retaining ring. Detailed Implementation

[0035] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0036] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0037] In addition, in the description of the utility model, need understanding is, the term "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "internal", "external", "axial", "radial", "circumferential" and so on the orientation or positional relation indicated is based on the orientation or positional relation shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and is not the device or element indicated or implied must have a particular orientation, with a particular orientation structure and operation, therefore can not be understood as the restriction of the utility model.

[0038] In the utility model, unless another explicit provision and limitation, the term "installation", "connection", "connect", "fixed" and so on the term should do broad sense, for example, can be fixed connection, also can be detachable connection, or integrated;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two element internal communication or two element interaction relationship.But note direct connection then explain the connection two main body between not through excessive structure construction connection relationship, only through the connecting structure is connected to form a whole.For the person skilled in the art, can understand the specific meaning of the above-mentioned term in the utility model according to the specific situation.

[0039] In the utility model, unless another explicit provision and limitation, the first feature is "on" or "under" the second feature first and second features can be directly contacted, or first and second features indirectly contact through the intermediate medium.In the description of the specification, the description of reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model.In the specification, the illustrative description of the above-mentioned terms is not necessarily for the same embodiment or example.Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way.

[0040] As Figures 1 to 3The utility model provides a kind of magneto-rheological damper, including cylinder 1, floating piston 2 and piston rod assembly located in cylinder 1, floating piston 2 is below piston rod assembly, piston rod assembly includes piston rod 3, guider outer sleeve 4, buffer block 5, upper pressing plate 6, electromagnetic coil 7, piston outer sleeve 8 and lower pressing plate 9, cylinder 1 upper end is equipped with the radially inward extending limit flanging 11, limit flanging 11 is pressed on the upper end surface of guider outer sleeve 4, by the cooperation of the limit flanging of cylinder upper end and guider outer sleeve, the problem that steel wire baffle ring is easy to come off in traditional damper is solved.Limit flanging directly presses guider outer sleeve, forms rigid limit, avoids the risk that guider outer sleeve and cylinder separate due to impact.This structural optimization significantly improves the stability of damper under large impact working condition, especially applicable to complex road conditions of off-road vehicle, reduces the probability of pull-out failure, guarantees the safety of vehicle.

[0041] In some embodiments, a downwardly extending buffer protrusion 51 can be provided at the lower end of the buffer block 5, which is pressed against the upper end surface of the upper pressing plate 6. By providing the buffer protrusion, the impact stress is evenly dispersed, avoiding the distortion or splitting problem of the traditional buffer block caused by self-contact. The protrusion structure can evenly fill the limit interval during impact, disperse stress concentration, improve impact resistance, and reduce the risk of fracture caused by material fatigue, further ensuring the reliability of the damper.

[0042] In some embodiments, the shape of the buffer protrusion 51 can be set as a trapezoidal or arc shape. The trapezoidal structure evenly disperses impact stress by increasing the contact area, avoiding the edge stress concentration problem of traditional rectangular protrusions. The arc structure conforms to the material stress deformation trend, reducing the rigid collision of the buffer block and adjacent components during impact. Both shapes can effectively prevent the buffer block from being distorted, invaded, or split due to self-contact, ensuring that it is fully filled within the limit interval and improving energy absorption efficiency. Combined with simulation optimization, this design significantly reduces the fatigue fracture risk of the buffer block under high-frequency impact, prolongs the service life, and enhances the overall anti-deformation ability of the damper under large impact working conditions, ensuring the reliability and stability of the limit action.

[0043] In some embodiments, the inclination angle β of the guide slope 61 can be 2° to 6°, i.e., the included angle between the guide slope 61 and the horizontal plane, preferably 4°. This can effectively guide the inward movement of the buffer block, while avoiding stress concentration caused by excessive angle. This angle range balances the structural strength and guiding efficiency, ensuring smooth resetting of the buffer block during impact, reducing wear on the guide slope, and further improving the durability of the damper. Of course, β can also be 2°, 3°, 5°, 6°, etc.

[0044] In some embodiments, a gap is provided between the lower end surface of the buffer protrusion 51 and the guide slope 61, and the gap value C is 0.2mm-0.5mm, preferably 0.35mm, which allows the buffer to deform freely at the initial impact to absorb energy, and avoids the delay of impact force transmission caused by excessive gap. The gap optimizes the matching precision of the buffer and the guide slope, ensures the sensitive response and no interference of the shock absorber, and improves the energy dissipation efficiency. Of course, C can also be 0.2mm, 0.25mm, 0.3mm, 0.4mm, 0.45mm, 0.5mm.

[0045] In some embodiments, a steel wire baffle 10 is provided between the upper end edge of the guide sleeve 4 and the cylinder 1, and the steel wire baffle 10 is blocked by a limiting flange 11. The double limiting of the steel wire baffle combined with the limiting flange optimizes the clamping groove structure and avoids the deformation or fatigue fracture problem of the traditional baffle. This design enhances the shear resistance of the baffle, ensures the stable connection of the guide sleeve and the cylinder, and further improves the upper limit of the pull-off force of the shock absorber assembly.

[0046] In some embodiments, the limiting flange 11 can be integrally formed with the cylinder 1 and made by a concave flanging process. The integrated concave flanging process of the cylinder and the limiting flange avoids the strength defects of traditional welding or split structure. The integrally formed structure greatly improves the local compressive strength of the cylinder, ensures the stable and reliable limiting effect of the guide sleeve, and simplifies the manufacturing process and reduces the process cost.

[0047] In some embodiments, the upper pressing plate 6 can be a titanium-aluminum alloy upper pressing plate; and / or the lower pressing plate 9 can be a titanium-aluminum alloy lower pressing plate. The titanium-aluminum alloy upper / lower pressing plate has higher strength and shear resistance, and can withstand larger impact load under the same volume. Compared with the traditional aluminum alloy 6061, its fatigue resistance and corrosion resistance are significantly improved, prolonging the service life of the pressing plate, and it is especially suitable for off-road working conditions with high frequency and large impact.

[0048] In some embodiments, the electromagnetic coil 7 is wound by flat wire enameled wire. The electromagnetic coil wound by flat wire enameled wire significantly improves the damping force adjustment range by increasing the effective working length and current density. Compared with the traditional round wire coil, its electromagnetic efficiency is improved by 10-20%, the power consumption is lower under the same damping force, and the response speed and control accuracy of the shock absorber are enhanced, which is suitable for scenes with higher dynamic performance requirements.

[0049] In addition to the above preferred embodiments, the technical solutions of the utility model are not limited to the above embodiments, it should be pointed out that the technical solutions of any one embodiment combined with the technical solutions of one or more other embodiments are within the protection scope of the utility model. Although the utility model has been described in detail by general description and specific embodiments above, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model all belong to the protection scope of the utility model.

Claims

1. A magneto-rheological damper, characterized by, The cylinder includes a cylinder barrel, a floating piston located in the cylinder barrel, and a piston rod assembly, the floating piston is located below the piston rod assembly, the piston rod assembly includes a piston rod, a guide sleeve, a buffer block, an upper pressing plate, an electromagnetic coil, a piston sleeve, and a lower pressing plate, an upper end of the cylinder barrel is provided with a limiting flange extending radially inward, and the limiting flange is pressed against an upper end surface of the guide sleeve.

2. The magneto-rheological damper according to claim 1, characterized in that A lower end of the buffer block is provided with a buffer protrusion extending downward, and the buffer protrusion is pressed against an upper end surface of the upper pressing plate.

3. The magneto-rheological damper according to claim 2, characterized in that An upper end surface of the upper pressing plate is provided with an inwardly inclined guide slope, and the guide slope forms dynamic cooperation with a lower end surface of the buffer protrusion.

4. The magneto-rheological damper according to claim 3, characterized in that An inclination angle of the guide slope is 2°-6°.

5. The magneto-rheological damper according to claim 3, wherein, A gap is provided between the lower end surface of the buffer protrusion and the guide slope, and a value of the gap is 0.2mm-0.5mm.

6. The magneto-rheological damper according to claim 2, wherein, The buffer protrusion is in a trapezoidal or arc shape.

7. The magneto-rheological damper according to claim 1, wherein, A steel wire retainer ring is provided between an upper end edge of the guide sleeve and the cylinder barrel, and the steel wire retainer ring is blocked by the limiting flange.

8. The magneto-rheological damper of claim 1, wherein, The limiting flange is integrally formed with the cylinder barrel and is made by a concave pressing flange process.

9. The magneto-rheological damper of claim 1, wherein, The upper pressing plate is a titanium-aluminum alloy upper pressing plate, and / or the lower pressing plate is a titanium-aluminum alloy lower pressing plate.

10. The magneto-rheological damper according to claim 1, wherein, The electromagnetic coil is wound by a flat wire enameled wire.

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