Magneto-rheological shock absorber and vehicle

Abstract

The utility model relates to a magneto-rheological shock absorber and a vehicle, the magneto-rheological shock absorber comprises a cylinder barrel used for accommodating magneto-rheological fluid, and the wall of the cylinder barrel is provided with a mounting groove; the piston is arranged in the cylinder barrel in a sliding mode, and a damping hole is formed in the piston; the piston rod is used for connecting the piston and equipment; the electromagnetic coil is arranged in the mounting groove and is used for generating a magnetic field; and the cover plate is matched with the mounting groove and is used for sealing the mounting groove. The mounting groove used for mounting the electromagnetic coil is formed in the outer wall of the cylinder barrel, the electromagnetic coil is arranged outside the cylinder barrel, the electromagnetic coil does not make contact with the magnetorheological fluid, the situation that the resistance of the electromagnetic coil is affected due to the fact that the temperature of the coil rises due to heat generated by flowing of the magnetorheological fluid can be avoided, normal work of the electromagnetic coil is guaranteed, and energy consumption is prevented from being increased. And moreover, the cover plate is matched with the mounting groove to shield the electromagnetic coil, so that the electromagnetic coil is prevented from being interfered by the external environment, the magnetic field stability is ensured, and the damping adjustment performance of the shock absorber is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetorheological shock absorber technical field, especially a kind of magnetorheological shock absorber and vehicle. BACKGROUND

[0002] Magnetorheological shock absorber is an advanced intelligent damping device, which controls damping force by adjusting the strength of the applied magnetic field, thereby realizing effective suppression of vibration.

[0003] At present, magnetorheological shock absorber is mainly composed of cylinder, piston, piston rod, electromagnetic coil and other components, the piston divides the cylinder into two chambers, magnetorheological fluid fills the entire cylinder, when the shock absorber is subjected to external force, the piston will move up and down in the cylinder, and the magnetorheological fluid flows between the upper and lower chambers through the small holes or gaps on the piston. When there is no magnetic field or the magnetic field is weak, the flow resistance of the magnetorheological fluid is small, which can quickly pass through the small holes or gaps, and the shock absorber provides small damping force, allowing the wheels to have certain flexible movement relative to the vehicle body to adapt to the ups and downs of the road. When it is necessary to increase the damping force, such as when the vehicle is driving at high speed or making sharp turns, the control system will increase the current of the electromagnetic coil to strengthen the magnetic field, increase the viscosity of the magnetorheological fluid, and greatly increase the flow resistance, thereby limiting the movement speed of the piston and providing large damping force to reduce the shaking and vibration of the vehicle body and improve the stability and handling of the vehicle.

[0004] However, the existing magnetorheological shock absorber often uses built-in coil, and the distance between the magnetic circuit structure and the damping channel is close, so the heat generated by the high-speed flow of the magnetorheological fluid in the damping channel is not easy to dissipate, which will cause the temperature of the coil to rise. The increase of coil temperature will change its resistance, affect current transmission, and then interfere with the magnetic field strength and distribution of the magnetic circuit, affect the normal continuous work of the magnetic circuit structure, in order to ensure the normal work of the magnetic circuit structure, more energy will be consumed to maintain. UTILITY MODEL CONTENTS

[0005] In view of the above-mentioned shortcomings of the prior art, one of the purposes of the utility model is to provide a magnetorheological shock absorber, which is used to solve the problem that the temperature of the coil of the existing coil built-in magnetorheological shock absorber is easy to rise, which causes the resistance to change and affects the current transmission. In order to maintain the normal work of the magnetic circuit structure, more energy needs to be consumed to maintain. The second purpose is to provide a vehicle.

[0006] To achieve the above-mentioned purposes and other related purposes, the utility model provides a magnetorheological shock absorber, which comprises:

[0007] The cylinder is used to contain magnetorheological fluid, and a mounting groove is formed in the wall of the cylinder, and the opening of the mounting groove faces the outside of the cylinder;

[0008] A piston is slidably arranged in the cylinder, and a damping hole is arranged on the piston for the flow of the MR fluid in the cylinder.

[0009] A piston rod is arranged for connecting the piston and a device.

[0010] An electromagnetic coil is arranged in the mounting groove, and the electromagnetic coil is used to generate a magnetic field to change the viscosity of the MR fluid.

[0011] A cover plate is arranged in cooperation with the mounting groove, and the cover plate is used to close the mounting groove.

[0012] Optionally, an energy recovery system is arranged on the piston rod, and the energy recovery system is used to convert the mechanical energy of the piston rod into electrical energy storage.

[0013] Optionally, the energy recovery system comprises at least one piezoelectric ceramic, a flexible printed circuit board, a rectifier circuit and an energy storage capacitor, the piezoelectric ceramic is connected with the flexible printed circuit board, the flexible printed circuit board is connected with the rectifier circuit, and the rectifier circuit is connected with the energy storage capacitor.

[0014] Optionally, the at least one piezoelectric ceramic is distributed along the circumference of the piston rod, and the piezoelectric ceramic is bonded to the surface of the piston rod.

[0015] Optionally, a groove is arranged on the piston rod for mounting the piezoelectric ceramic, an axial wire channel is arranged on the piston rod, a wire inlet hole is arranged at the bottom of the groove, the wire inlet hole is in communication with the wire channel, and a wire outlet hole is arranged on the piston rod, and the wire outlet hole is in communication with the wire channel.

[0016] Optionally, a ring-shaped circuit box is arranged on the piston rod and located outside the cylinder, and the ring-shaped circuit box is used to mount the flexible printed circuit board, the rectifier circuit and the energy storage capacitor.

[0017] Optionally, the wall thickness of the bottom of the mounting groove is less than 1 / 10 of the wall thickness of the cylinder.

[0018] Optionally, a soft iron magnetic pole is arranged between the electromagnetic coil and the bottom of the mounting groove.

[0019] Optionally, the length of the piezoelectric ceramic is greater than or equal to 1 / 2 of the length of the piston rod.

[0020] A vehicle comprises the MR shock absorber as described above.

[0021] As described above, the present application has the following beneficial effects: by opening the mounting groove for mounting the electromagnetic coil on the outer wall of the cylinder barrel, the electromagnetic coil is externally mounted on the cylinder barrel, the electromagnetic coil has no contact with the magnetorheological fluid, the coil temperature rise caused by the heat generated by the magnetorheological fluid flow can be avoided to affect the resistance of the electromagnetic coil, thereby ensuring the normal work of the electromagnetic coil and avoiding the increase of energy consumption. Moreover, the electromagnetic coil is shielded by the cover plate cooperating with the mounting groove, the electromagnetic coil is prevented from being interfered by the external environment, the stability of the magnetic field is ensured, and the damping adjustment performance of the shock absorber is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A cross-sectional structure schematic diagram of a magnetorheological shock absorber shown in the embodiment of the present application is shown.

[0023] Figure 2 A cross-sectional structure schematic diagram of a piston rod shown in the embodiment of the present application is shown. Figure 1 A cross-sectional structure schematic diagram of a piston rod shown in the embodiment of the present application is shown.

[0024] Figure 3 A cross-sectional structure schematic diagram of a magnetorheological shock absorber shown in the embodiment of the present application is shown.

[0025] EXPLANATION OF REFERENCE NUMERALS

[0026] Cylinder barrel 1, mounting groove 101, piston 2, damping hole 201, piston rod 3, recess 301, wire channel 302, wire inlet hole 303, wire outlet hole 304, cover plate 4, piezoelectric ceramic 5, annular circuit box 6. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. The present application can also be implemented or applied through other different specific embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0028] Please refer to Figures 1 to 3It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components relevant to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes and to assist those skilled in the art in understanding and reading the content disclosed in the specification. They are not intended to limit the implementation conditions of this utility model and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0029] Before describing the embodiments of this utility model in detail, the application environment of this utility model will be described first. The technology of this utility model is mainly applied to the field of magnetorheological damper technology. This utility model is used to solve the problem that in existing coil-embedded magnetorheological dampers, the coil temperature easily rises during operation, causing changes in resistance, affecting current transmission, and requiring more energy to maintain the normal operation of the magnetic circuit structure.

[0030] Please combine Figures 1 to 3 As shown, this utility model provides a magnetorheological damper.

[0031] In one exemplary embodiment of this application, the magnetorheological damper includes:

[0032] Cylinder 1 is used to contain magnetorheological fluid. A mounting groove 101 is provided on the cylinder wall of cylinder 1, and the opening of the mounting groove 101 faces the outside of cylinder 1.

[0033] Piston 2 is slidably disposed inside cylinder 1. A damping hole 201 is provided on piston 2 for the flow of magnetorheological fluid inside cylinder 1.

[0034] Piston rod 3 is used to connect piston 2 to the equipment;

[0035] An electromagnetic coil is installed in the mounting groove 101. The electromagnetic coil is used to generate a magnetic field to change the viscosity of the magnetorheological fluid.

[0036] The cover plate 4 cooperates with the mounting groove 101 and is used to close the mounting groove 101.

[0037] In this embodiment, the mounting groove 101 is opened along the circumference of the cylinder 1, with its opening facing the outside of the cylinder 1. The bottom of the mounting groove 101 separates the magnetorheological fluid inside the cylinder 1 from the electromagnetic coil, preventing the electromagnetic coil from contacting the magnetorheological fluid. This avoids the phenomenon of the electromagnetic coil's temperature rising due to the flow of the magnetorheological fluid, which would cause changes in the electromagnetic coil's resistance. This also avoids the problem of increased energy consumption due to maintaining the normal operation of the magnetic circuit structure. The electromagnetic coil uses highly conductive enameled copper wire to reduce resistance loss. The cylinder 1 is filled with magnetorheological fluid, which is divided into two chambers by a piston 2. The magnetorheological fluid flows through the two chambers via a damping orifice 201 on the piston 2. The piston 2 is connected to external equipment (including but not limited to the vehicle's suspension system) via a piston rod 3. The piston rod 3 transmits the vibration displacement and force of the external equipment to the piston 2, which in turn transmits the vibration impact force to the magnetorheological fluid. Simultaneously, the piston 2 transmits the resistance generated by the changes in the rheological properties of the magnetorheological fluid to the piston rod 3. The piston rod 3 then transmits the reaction force of the magnetorheological fluid back to the external equipment, thereby achieving the buffering and suppression of vibration. By controlling the magnitude of the input current to the electromagnetic coil and adjusting the magnetic field strength, the viscosity of the magnetorheological fluid and the damping force of the shock absorber can be controlled. The cover plate 4 is made of materials including but not limited to aluminum alloy or copper. The cover plate 4 cooperates with the mounting groove 101 to seal the mounting groove 101, which can achieve good shielding performance for the electromagnetic coil and facilitate heat dissipation of the electromagnetic coil. After the cover plate 4 is installed in conjunction with the mounting groove 101 of the cylinder 1, the outer surface of the cover plate 4 is flush with the outer wall of the cylinder 1, so that the electromagnetic coil is placed externally in this application without affecting the shape and structure of the cylinder 1, and can be adapted to all the original installation application environments.

[0038] In one exemplary embodiment of this application, an energy recovery system is also included, which is disposed on the piston rod 3 and is used to convert the mechanical energy of the piston rod 3 into electrical energy for storage.

[0039] In this embodiment, by placing the coil externally, a more flexible installation space is provided inside the cylinder 1 for the energy recovery system, so that the energy recovery system installed on the piston rod 3 is not limited by the space of the built-in coil structure. When the magnetorheological damper is working, the reciprocating motion of the piston 2 generates mechanical energy. The energy recovery system converts the mechanical energy generated by the piston 2 into electrical energy for storage. The stored electrical energy can be used to power other systems, significantly improving the energy-saving effect of the magnetorheological damper.

[0040] In an exemplary embodiment of this application, the energy recovery system includes at least one piezoelectric ceramic 5, a flexible printed circuit board, a rectifier circuit, and an energy storage capacitor. The piezoelectric ceramic 5 is connected to the flexible printed circuit board, the flexible printed circuit board is connected to the rectifier circuit, and the rectifier circuit is connected to the energy storage capacitor.

[0041] In this embodiment, the energy recovery system includes multiple piezoelectric ceramics 5 distributed circumferentially along the piston rod 3. When the piston rod 3 reciprocates, the piezoelectric ceramics 5 are subjected to mechanical stress transmitted from the surface of the piston rod 3. Due to the piezoelectric effect, the piezoelectric ceramics 5 convert the mechanical energy of the piston rod 3 into electrical energy. The multiple piezoelectric ceramics 5 are connected into an integrated circuit through a flexible printed circuit board. The alternating current generated by the piezoelectric ceramics 5 is rectified into direct current through a rectifier circuit and stored in an energy storage capacitor.

[0042] In yet another exemplary embodiment, the energy recovery system includes a ring-shaped piezoelectric ceramic 5, which covers the surface of the piston rod 3. The ring-shaped piezoelectric ceramic 5 can capture more mechanical energy and has a higher energy collection efficiency.

[0043] In an exemplary embodiment of this application, at least one piezoelectric ceramic 5 is distributed along the circumference of the piston rod 3, and the piezoelectric ceramic 5 is bonded to the surface of the piston rod 3.

[0044] In this embodiment, multiple piezoelectric ceramics 5 are distributed circumferentially along the piston rod 3 and directly bonded to the surface of the piston rod 3, and then covered with a waterproof membrane. The conductive wires are axially connected along the surface of the piston rod 3 to a flexible printed circuit board located outside the cylinder 1. This method of directly bonding the piezoelectric ceramics 5 to the surface of the piston rod 3 is simple and convenient to install, requires no modification to the piston rod 3, and is cost-effective.

[0045] In an exemplary embodiment of this application, a groove 301 is provided on the piston rod 3 for mounting the piezoelectric ceramic 5. A wiring channel 302 is provided along the axial direction of the piston rod 3. An inlet hole 303 is provided at the bottom of the groove 301, which communicates with the wiring channel 302. An outlet hole 304 is provided on the piston rod 3, which communicates with the wiring channel 302.

[0046] In this embodiment, a groove 301 for mounting the piezoelectric ceramic 5 is machined on the piston rod 3, and a wiring channel 302 is formed along the circumference of the piston rod 3. The wires of the piezoelectric ceramic 5 are routed into the wiring channel 302 through the inlet hole 303, and then connected to the flexible printed circuit board outside the cylinder 1 through the outlet hole 304. By mounting the piezoelectric ceramic 5 through the groove 301 on the piston rod 3, the entire device can be made more compact, reducing the space occupied. At the same time, using the wiring channel 302 for wiring can avoid wire clutter and improve integration.

[0047] In an exemplary embodiment of this application, an annular circuit box 6 is also included. The annular circuit box 6 is disposed on the piston rod 3 and located outside the cylinder 1. The annular circuit box 6 is used to mount a flexible printed circuit board, a rectifier circuit, and an energy storage capacitor.

[0048] In this embodiment, by setting up a ring circuit box 6 to install a flexible printed circuit board, a rectifier circuit, and an energy storage capacitor, the integration of the energy recovery system can be improved, and the connection problems between various circuits can be effectively reduced.

[0049] In an exemplary embodiment of this application, the wall thickness of the bottom of the mounting groove 101 is less than 1 / 10 of the wall thickness of the cylinder 1.

[0050] In this embodiment, by setting the wall thickness of the bottom of the mounting groove 101 to be less than 1 / 10 of the wall thickness of the cylinder 1, the wall thickness of the bottom of the mounting groove 101 is very thin, and the electromagnetic coil can influence the magnetic field change of the magnetorheological fluid in the cylinder 1 through the mounting groove 101.

[0051] In an exemplary embodiment of this application, a soft ferromagnetic pole is provided between the electromagnetic coil and the bottom of the mounting groove 101.

[0052] In this embodiment, the magnetic field lines are concentrated in the magnetorheological fluid region by a soft ferromagnetic pole set between the electromagnetic coil and the bottom of the mounting groove 101, thereby ensuring that the magnetic field can effectively act on the magnetorheological fluid.

[0053] In an exemplary embodiment of this application, the length of the piezoelectric ceramic 5 is greater than or equal to half the length of the piston rod 3.

[0054] In this embodiment, the piezoelectric ceramic 5 is arranged as long as possible within the stroke range of the piston rod 3 within the cylinder 1. A longer piezoelectric ceramic 5 can capture more energy, thereby improving energy conversion efficiency. Therefore, the length of the piezoelectric ceramic 5 is designed to be greater than or equal to half the length of the piston rod 3, so that the energy recovery system has high energy recovery performance.

[0055] This application also proposes a vehicle including the magnetorheological damper described above.

[0056] The working principle involves creating a mounting groove 101 on the outer wall of the cylinder 1 for installing the electromagnetic coil. The electromagnetic coil is placed externally within the cylinder 1, without contact with the magnetorheological fluid. This prevents the heat generated by the fluid flow from affecting the coil's resistance and ensuring normal operation, thus avoiding increased energy consumption. Furthermore, the cover plate 4, in conjunction with the mounting groove 101, shields the electromagnetic coil, preventing external interference and ensuring magnetic field stability, thereby guaranteeing the damping adjustment performance of the shock absorber. An energy recovery system on the piston rod 3 recovers the mechanical energy generated during piston rod movement and stores it as electrical energy, effectively improving the energy-saving effect of the magnetorheological shock absorber shown in this embodiment.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A magnetorheological damper, characterized in that, include: A cylinder for containing magnetorheological fluid, wherein a mounting groove is provided on the cylinder wall, and the opening of the mounting groove faces the outside of the cylinder; A piston is slidably disposed inside the cylinder. A damping hole is provided on the piston for the flow of magnetorheological fluid inside the cylinder. Piston rod, used to connect the piston to the device; An electromagnetic coil is disposed in the mounting groove. The electromagnetic coil is used to generate a magnetic field to change the viscosity of the magnetorheological fluid. A cover plate, which mates with the mounting groove, is used to close the mounting groove.

2. The magnetorheological damper according to claim 1, characterized in that: It also includes an energy recovery system, which is installed on the piston rod and is used to convert the mechanical energy of the piston rod into electrical energy for storage.

3. The magnetorheological damper according to claim 2, characterized in that: The energy recovery system includes at least one piezoelectric ceramic, a flexible printed circuit board, a rectifier circuit, and an energy storage capacitor. The piezoelectric ceramic is connected to the flexible printed circuit board, the flexible printed circuit board is connected to the rectifier circuit, and the rectifier circuit is connected to the energy storage capacitor.

4. The magnetorheological damper according to claim 3, characterized in that: At least one of the piezoelectric ceramics is distributed circumferentially along the piston rod, and the piezoelectric ceramic is bonded to the surface of the piston rod.

5. The magnetorheological damper according to claim 3, characterized in that: The piston rod has a groove for mounting the piezoelectric ceramic. The piston rod has a wiring channel along its axial direction. The bottom of the groove has an inlet hole that communicates with the wiring channel. The piston rod also has an outlet hole that communicates with the wiring channel.

6. The magnetorheological damper according to claim 3, characterized in that: It also includes an annular circuit box, which is disposed on the piston rod and located outside the cylinder. The annular circuit box is used to mount a flexible printed circuit board, a rectifier circuit, and an energy storage capacitor.

7. The magnetorheological damper according to claim 1, characterized in that: The wall thickness of the bottom of the mounting groove is less than 1 / 10 of the wall thickness of the cylinder.

8. The magnetorheological damper according to claim 7, characterized in that: A soft ferromagnetic pole is provided between the electromagnetic coil and the bottom of the mounting groove.

9. The magnetorheological damper according to claim 3, characterized in that: The length of the piezoelectric ceramic is greater than or equal to 1 / 2 of the length of the piston rod.

10. A vehicle, characterized in that, Including the magnetorheological damper as described in any one of claims 1-9.

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