Damping sleeve for automobile control arm

Abstract

The damping sleeve for the automobile control arm comprises an inner pipe, the outer end of the inner pipe is fixedly connected with a fixing ring, the outer end of the fixing ring is fixedly connected with a piezoelectric deformation ring, the outer end of the piezoelectric deformation ring is fixedly connected with a capacitor layer, and the top end and the bottom end of the capacitor layer are both fixedly connected with inner buffer rings. The stress between the inner pipe and the outer pipe firstly attenuates vibration through deformation of the inner buffer ring, the outer buffer ring and the reset rings, meanwhile, liquid media filled in the inner buffer chamber, the outer buffer chamber, the first reset chamber and the second reset chamber flow to further absorb vibration energy, the piezoelectric deformation ring is stressed to generate power, the capacitance layer stores electric energy, and the adjusting ring changes the diameter of the through hole through the stored electric energy. The flow resistance of a liquid medium is actively adjusted, the damping characteristic is optimized, and the reset piece is electrified and deformed to assist the reset ring in resetting. The whole damping sleeve integrates sensing, driving, execution and energy storage, multiple functions of damping, resetting, power generation, self-adaptive adjustment and the like are achieved, and the damping characteristic is excellent.

Description

Technical Field

[0001] The invention relates to a shock-absorbing sleeve for an automobile control arm with high safety performance, in particular to a shock-absorbing sleeve for an automobile control arm applied in the technical field of automobile suspension systems. Background Art

[0002] With the rapid development of the automobile industry, people have put forward higher and higher requirements for the handling stability and ride comfort of automobiles. As an important component connecting the body and the wheels, the performance of the control arm has a vital impact on the handling and comfort of the whole vehicle. Traditional control arm bushings are mostly made of rubber materials with fixed damping characteristics, which are difficult to adapt to complex and changeable road conditions. Although the performance of hydraulic bushings has been improved, there is still a lot of room for optimization in structural design and function realization.

[0003] Chinese invention patent CN115654060 discloses a hydraulic bushing, which achieves the purpose of actively adjusting damping as pressure changes by setting a liquid chamber and a limit structure between the elastomer and the outer tube, and setting a blocking block on the elastomer as a one-way valve, and to a certain extent takes into account both controllability and comfort. However, the patent fails to make full use of smart materials, the adjustment method is relatively simple, and the damping force adjustment range is limited. In addition, there is a lack of effective absorption and recycling of impact energy.

[0004] Chinese invention patent CN114857205 discloses a control arm hydraulic bushing, which uses an inner tube, an outer tube, a spring and other structures to form a hydraulic cavity, and uses a flow channel and a limiter to achieve a damping effect and alleviate impact. However, this patent mainly focuses on avoiding abnormal noise, and lacks consideration in terms of active damping adjustment and energy recovery, and the level of intelligence needs to be further improved.

[0005] Although the above-mentioned prior art has improved the vibration reduction performance of the bushing to a certain extent, with the increasing pursuit of automobile handling performance and ride comfort today, the traditional passive bushing can no longer meet the demand, and an intelligent control arm shock-absorbing bushing with high safety performance is urgently needed. Summary of the invention

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to solve the technical problems such as the non-adjustable damping characteristics of the shock absorbing sleeve of the traditional automobile control arm, the lack of intelligent control means, the poor shock absorbing performance, and the low energy utilization rate.

[0007] In order to solve the above problems, the present invention provides a shock-absorbing sleeve for an automobile control arm, comprising an inner tube, a fixing ring is fixedly connected to the outer end of the inner tube, a piezoelectric deformation ring is fixedly connected to the outer end of the fixing ring, a capacitor layer is fixedly connected to the outer end of the piezoelectric deformation ring, the top and bottom ends of the capacitor layer are fixedly connected to inner buffer rings, a plurality of inner buffer rings are fixedly connected to a reset ring at one end away from the capacitor layer, a plurality of inner buffer rings and reset rings are fixedly connected to the same outer tube at their outer ends, a portion of the inner wall of the outer tube located between the inner buffer rings is fixedly connected to an outer buffer ring, an inner buffer chamber is formed between the fixing ring and the capacitor layer, an outer buffer chamber is formed between the capacitor layer, the inner buffer ring and the outer buffer ring, and the capacitor layer is selectively electrically connected to a controller.

[0008] As a further improvement of the present application, a first reset chamber is opened in the inner buffer ring, and a second reset chamber is formed between the inner buffer ring and the reset ring. The inner buffer chamber, the outer buffer chamber, the first reset chamber and the second reset chamber are all filled with liquid working medium, and the liquid working medium can be selected from hydraulic oil or magnetorheological fluid material.

[0009] As a further improvement of the present application, connecting pipes are fixedly connected between the first reset chamber and the inner buffer chamber, the outer buffer chamber and the second reset chamber, and the inner buffer ring, the reset ring and the outer buffer ring are all made of high-elastic rubber.

[0010] As a further improvement of the present application, the piezoelectric deformation ring includes a piezoelectric sheet, and the top and bottom ends of the piezoelectric sheet are fixedly connected with reset shoes. The piezoelectric sheet is made of elastic material, and the reset shoes are made of piezoelectric material.

[0011] As another improvement of the present application, the capacitor layer includes a first conductor layer fixedly connected to the piezoelectric piece, the outer end of the first conductor layer is fixedly connected to an insulating layer, the outer end of the insulating layer is fixedly connected to a second conductor layer, and the first conductor layer, the insulating layer and the second conductor layer form a capacitor.

[0012] As another improved supplement of the present application, the two levels of the reset shoe are electrically connected to the first conductor layer and the second conductor layer respectively, a plurality of reset plates are embedded in the reset ring, and the plurality of reset plates are electrically connected to the capacitor layer.

[0013] As another improvement supplement of the present application, an adjustment ring is provided in the connecting tube, both ends of the adjustment ring are conical structures, and the ends with larger diameters of the conical structures are arranged close to each other, the reset plate and the adjustment ring are both made of electrically telescopic materials, and the adjustment ring is electrically connected to the capacitor layer.

[0014] As another improvement of the present application, a groove matching the outer end of the adjustment ring is provided on the inner wall of the connecting tube, and a gap of 0.5-1 mm is reserved between the groove and the adjustment ring. A through hole is provided in the adjustment ring, and the diameter of the through hole is smaller than the inner diameter of the connecting tube.

[0015] In summary, this application has the following beneficial effects:

[0016] 1. Excellent shock absorption performance: This patent adopts a multi-layer shock absorption structure, including an inner buffer ring, an outer buffer ring, a reset ring, etc., which work together to effectively absorb the impact and vibration from the road surface and provide flexible buffering. At the same time, the inner buffer chamber, the outer buffer chamber, and the first and second reset chambers are filled with liquid working medium, and the flow between different chambers is used to further attenuate the vibration energy, achieving a double shock absorption effect and improving shock absorption performance.

[0017] 2. Adaptive damping adjustment: A piezoelectric sheet is installed inside the shock-absorbing sleeve, which can generate electricity when deformed by external force. The generated electric energy is used to drive the diameter of the through hole in the adjustment ring to change, thereby adjusting the flow resistance of the liquid working medium, and then realizing active adjustment of the shock-absorbing damping. The shock-absorbing characteristic curve can be optimized in real time according to the actual working conditions.

[0018] 3. Electronically controlled active reset; in addition to passive reset relying on the elastic deformation of components such as the inner buffer ring and the reset ring, this patent also utilizes the piezoelectric characteristics of the reset plate to produce deformation when powered on, exerting thrust on the reset ring to assist it in returning to its original position more quickly, thereby improving dynamic response and enhancing system stability.

[0019] 4. The shock-absorbing sleeve is self-powered; traditional active control shock absorbers require an external power supply, while this patent utilizes the power generation effect of the piezoelectric sheet when it is deformed under force, combined with the capacitor layer to store electrical energy, to achieve self-powered shock absorbing sleeves, simplify the power supply system, and improve reliability.

[0020] 5. Long life and maintenance-free: The patent claims use high elastic rubber to make the inner buffer ring, reset ring and other key components, which have excellent fatigue resistance and long service life. The electric adjustment ring replaces the traditional mechanical valve, eliminating the need for regular maintenance and reducing the cost of use.

[0021] 6. Compact structure and easy integration; this patent integrates multiple functions such as perception, driving, execution, and energy storage. Various functional components are integrated in the same shock-absorbing sleeve through clever design, reducing the number of parts and reducing complexity, making it easier to integrate into the existing suspension system.

[0022] 7. Environmental protection and energy saving: This shock-absorbing sleeve adopts new intelligent materials such as piezoelectric materials and electrorheological fluids. When the car is frequently bumpy, it can convert mechanical energy into electrical energy for storage and utilization. It has a good energy recovery effect and is in line with the development direction of energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the overall structure diagram of this application;

[0024] Figure 2 This is the front view of the application;

[0025] Figure 3 For this application Figure 2 Middle AA section view;

[0026] Figure 4 For this application Figure 3 Middle BB section view;

[0027] Figure 5 For this application Figure 3 Middle CC section view;

[0028] Figure 6 This is an overall exploded view of this application;

[0029] Figure 7 Partial explosion for this application Figure 1 ;

[0030] Figure 8 Partial explosion for this application Figure 2 ;

[0031] Fig. 9 Partial explosion for this application Figure 3 ;

[0032] Fig.10 This is the appearance structure diagram of this application.

[0033] Description of the numbers in the figure:

[0034] 1. Inner tube; 2. Fixed ring; 3. Piezoelectric deformation ring; 4. Capacitor layer; 5. Inner buffer ring; 6. Reset ring; 7. Outer tube; 8. Outer buffer ring; 9. Inner buffer chamber; 10. Outer buffer chamber; 11. First reset chamber; 12. Second reset chamber; 13. Connecting tube; 14. Piezoelectric sheet; 15. Reset shoe; 16. First conductor layer; 17. Insulating layer; 18. Second conductor layer; 19. Reset sheet; 20. Adjustment ring. DETAILED DESCRIPTION

[0035] Three implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0036] The first implementation method:

[0037] Figure 1-Figure 10 Shown.

[0038] A shock-absorbing sleeve for an automobile control arm comprises an inner tube 1, the outer end of the inner tube 1 is fixedly connected to a fixing ring 2, the outer end of the fixing ring 2 is fixedly connected to a piezoelectric deformation ring 3, the outer end of the piezoelectric deformation ring 3 is fixedly connected to a capacitor layer 4, the top and bottom ends of the capacitor layer 4 are fixedly connected to an inner buffer ring 5, a plurality of inner buffer rings 5 ​​are fixedly connected to a reset ring 6 at one end away from the capacitor layer 4, the outer ends of the plurality of inner buffer rings 5 ​​and the reset ring 6 are fixedly connected to the same outer tube 7, the inner wall of the outer tube 7 between the inner buffer rings 5 ​​is fixedly connected to an outer buffer ring 8, an inner buffer chamber 9 is formed between the fixing ring 2 and the capacitor layer 4, an outer buffer chamber 10 is formed between the capacitor layer 4, the inner buffer ring 5 and the outer buffer ring 8, and the capacitor layer 4 can be selectively electrically connected to a controller.

[0039] The inner tube 1 can be made of metal materials, such as steel, aluminum alloy, etc., and the outer end is fixedly connected to a metal fixing ring 2 by welding, riveting, etc. The outer end of the fixing ring 2 is fixedly connected to a piezoelectric deformation ring 3 by bonding. The piezoelectric deformation ring 3 can be made of piezoelectric ceramic materials such as PZT, and can generate voltage when it is squeezed or stretched.

[0040] The outer end of the piezoelectric deformation ring 3 is bonded with a capacitor layer 4, which can be composed of two layers of conductive materials such as silver paste and an insulating material such as epoxy resin in the middle. The potential difference between the two conductive layers can be used to temporarily store electrical energy. The top and bottom ends of the capacitor layer 4 are bonded with an inner buffer ring 5, which can be made of a highly elastic rubber material to play a buffering and shock absorbing role.

[0041] The end of the inner buffer ring 5 facing away from the capacitor layer 4 is also bonded with a reset ring 6, which is also made of highly elastic rubber material and can automatically return to its original position after deformation. The outer ends of multiple inner buffer rings 5 ​​and reset rings 6 are all bonded and fixed to the inner wall of the outer tube 7 made of the same metal material. The inner wall of the outer tube 7 between two adjacent inner buffer rings 5 ​​is also bonded with an outer buffer ring 8, which is made of the same material as the inner buffer ring 5 to further enhance the shock absorption effect.

[0042] In the above structure, an inner buffer chamber 9 is formed between the fixed ring 2 and the capacitor layer 4, and an outer buffer chamber 10 is formed between the capacitor layer 4, the inner buffer ring 5 and the outer buffer ring 8. The inner buffer chamber 9 and the outer buffer chamber 10 are filled with liquid media such as lubricating oil, and the flow viscous damping thereof is used to realize vibration energy dissipation. In addition, the capacitor layer 4 can also be electrically connected to the controller through a wire to realize active adjustment of the damping performance.

[0043] By arranging the piezoelectric deformation ring 3 between the inner tube 1 and the outer tube 7, when the shock-absorbing sleeve is subjected to an impact load, the piezoelectric deformation ring 3 deforms to generate voltage, which can collect the impact energy and convert it into electrical energy, thus achieving the effect of energy recovery and utilization.

[0044] The capacitor layer 4 is connected to the piezoelectric deformation ring 3, and can store the generated electric energy to supply the controller and the execution components, thereby reducing the demand for an external power supply and realizing self-powering of the shock-absorbing sleeve.

[0045] The inner buffer ring 5, the reset ring 6 and the outer buffer ring 8 are made of highly elastic rubber material and can automatically reset after being deformed by pressure, thereby achieving good shock absorption effect and service life.

[0046] The inner buffer chamber 9 and the outer buffer chamber 10 are filled with liquid medium, which utilizes the flow viscosity damping to attenuate the vibration energy and cooperates with the deformation of the rubber part to further improve the vibration reduction performance.

[0047] The controller can be used to adjust the parameters of the capacitor layer 4, thereby controlling the viscosity of the liquid medium, etc., to achieve active adjustment of the shock absorption damping and flexibly adapt to different working conditions.

[0048] In addition to the above-mentioned embodiments, the present invention may also have other embodiments, for example, a one-way valve or a controllable valve is provided between the inner buffer chamber 9 and the outer buffer chamber 10 to achieve asymmetric adjustment of the damping force and optimize the pitch performance.

[0049] The reset ring 6 is filled with MRE magnetorheological elastomer material, and its stiffness characteristics can be changed by passing different magnetic fields, thereby improving the frequency adaptability of the shock absorber.

[0050] The capacitor layer 4 can also be replaced with supercapacitor material to increase the energy storage capacity and charge and discharge rate.

[0051] A dust cover may also be provided between the outer tube 7 and the inner tube 1 to extend the service life.

[0052] Combining this patented technology with the active suspension control algorithm and performing feedforward control based on road information will further enhance the overall vehicle intelligence level and improve the driving experience in all aspects.

[0053] The second implementation method:

[0054] Figure 1-Figure 10 Shown.

[0055] A first reset chamber 11 is provided in the inner buffer ring 5, a second reset chamber 12 is formed between the inner buffer ring 5 and the reset ring 6, and the inner buffer chamber 9, the outer buffer chamber 10, the first reset chamber 11 and the second reset chamber 12 are all filled with liquid working medium, and the liquid working medium can be hydraulic oil or magnetorheological fluid material.

[0056] A connecting pipe 13 is fixedly connected between the first reset chamber 11 and the inner buffer chamber 9, the outer buffer chamber 10 and the second reset chamber 12. The inner buffer ring 5, the reset ring 6 and the outer buffer ring 8 are all made of high-elastic rubber.

[0057] The piezoelectric deformation ring 3 comprises a piezoelectric sheet 14 , and the top and bottom ends of the piezoelectric sheet 14 are fixedly connected with reset pads 15 . The piezoelectric sheet 14 is made of elastic material, and the reset pads 15 are made of piezoelectric material.

[0058] The capacitor layer 4 includes a first conductor layer 16 fixedly connected to the piezoelectric sheet 14, an outer end of the first conductor layer 16 is fixedly connected to an insulating layer 17, and an outer end of the insulating layer 17 is fixedly connected to a second conductor layer 18. The first conductor layer 16, the insulating layer 17 and the second conductor layer 18 form a capacitor.

[0059] The two levels of the reset shoe 15 are electrically connected to the first conductor layer 16 and the second conductor layer 18 respectively. A plurality of reset plates 19 are embedded in the reset ring 6 , and the plurality of reset plates 19 are electrically connected to the capacitor layer 4 .

[0060] An adjusting ring 20 is disposed in the connecting pipe 13 . Both ends of the adjusting ring 20 are conical structures, and the ends with larger diameters of the conical structures are disposed close to each other.

[0061] The reset sheet 19 and the adjustment ring 20 are both made of electro-telescopic materials, and the adjustment ring 20 is electrically connected to the capacitor layer 4 .

[0062] The inner wall of the connecting tube 13 is provided with a groove matching the outer end of the adjusting ring 20 , and a gap of 0.5-1 mm is reserved between the groove and the adjusting ring 20 . The adjusting ring 20 is provided with a through hole, and the diameter of the through hole is smaller than the inner diameter of the connecting tube 13 .

[0063] A first reset chamber 11 is provided inside the inner buffer ring 5, a second reset chamber 12 is formed between the inner buffer ring 5 and the reset ring 6, and the inner buffer chamber 9, the outer buffer chamber 10, the first reset chamber 11, and the second reset chamber 12 are all filled with liquid working medium, and hydraulic oil or magnetorheological fluid material can be selected. When magnetorheological fluid is selected, its viscosity can be adjusted by changing the external magnetic field to achieve active control of the damping force.

[0064] The first reset chamber 11 is connected to the inner buffer chamber 9, the outer buffer chamber 10 and the second reset chamber 12 through the connecting pipe 13, so that the liquids in the liquid chambers can flow mutually. The inner buffer ring 5, the reset ring 6 and the outer buffer ring 8 are all made of high elastic rubber materials to ensure that the shock-absorbing sleeve can be reliably reset after being deformed by force.

[0065] The piezoelectric deformation ring 3 can be formed by splicing a plurality of piezoelectric sheets 14 in a circular direction, and the top and bottom of each piezoelectric sheet 14 are bonded with a reset shoe 15 for electrode protection and deformation reset. Among them, the piezoelectric sheet 14 can be made of flexible piezoelectric materials such as PVDF, which has a certain elasticity; and the reset shoe 15 can be made of hard piezoelectric ceramics such as PZT, which has a high rigidity. The two are combined to take into account flexibility and sensing ability.

[0066] The capacitor layer 4 can be formed by stacking a first conductor layer 16, an insulating layer 17 and a second conductor layer 18, and uses the potential difference between the two conductive layers to form a capacitor effect to store electrical energy. The first conductor layer 16 is bonded to the piezoelectric sheet 14 to sense its voltage change. The insulating layer 17 can be made of a polymer film. The first conductor layer 16 and the second conductor layer 18 are electrically connected to the two ends of the reset shoe 15 of the piezoelectric deformation ring 3 respectively, and work in parallel.

[0067] A plurality of reset sheets 19 are embedded inside the reset ring 6, and are all electrically connected to the capacitor layer 4. The reset sheet 19 is made of an electrostrictive material such as IPMC, and deforms when energized, pushing the reset ring 6 to reset. The adjustment ring 20 is arranged inside the connecting tube 13, and both ends of the adjustment ring 20 are tapered structures with the inner diameter gradually contracting inward. By controlling the relative positions of the tapered parts at both ends, the diameter of the internal through hole can be changed, thereby adjusting the fluid flow resistance.

[0068] In addition, the inner wall of the connecting tube 13 is also provided with an annular groove matching the shape of the adjusting ring 20. The two cooperate to make the position fixation of the adjusting ring more reliable. A gap of 0.5-1mm is reserved between the adjusting ring and the groove to avoid jamming. The diameter of the internal through hole of the adjusting ring 20 is slightly smaller than the inner diameter of the connecting tube 13 to obtain a suitable adjustment range.

[0069] The liquid working medium flows between the inner buffer chamber 9, the outer buffer chamber 10, the first reset chamber 11 and the second reset chamber 12, generating viscous damping, absorbing impact energy and improving shock absorption performance. In particular, when magnetorheological fluid is used, the damping force can be actively regulated by adjusting the magnetic field to meet the needs of different working conditions.

[0070] The piezoelectric sheet 14 cooperates with the reset shoe 15 to take into account the deformation sensing capability and self-reset capability of the piezoelectric deformation ring 3 after deformation, thereby improving the integration and working stability of the shock-absorbing sleeve.

[0071] The multi-layer structure design of the capacitor layer 4 improves the energy storage capacity, and is connected in series at both ends of the piezoelectric deformation ring 3 to reliably collect and store vibration energy to meet the power supply requirements of the controller and the actuator.

[0072] The electro-deformable reset sheet 19 is arranged in the reset ring 6, and the deformation thereof can be controlled to assist the reset ring 6 to reset more quickly, thereby reducing hysteresis and improving dynamic response performance.

[0073] A conical adjustment ring 20 is arranged in the connecting tube 13, and the cross-sectional area of ​​the through hole is adjusted by controlling its axial displacement, thereby changing the liquid flow resistance, realizing active regulation of shock absorption and damping, and adapting to different vibration frequency conditions. At the same time, the matching design of the adjustment ring 20 and the inner wall of the connecting tube 13 improves the reliability of the fixing position of the adjustment ring 20 and reduces wear.

[0074] In addition to the above-mentioned embodiments, the present invention may also have other embodiments. For example, a plurality of distributed adjustment rings 20 may be provided on the connecting pipe 13 to independently control the damping force distribution at different positions, thereby achieving more precise damping force regulation.

[0075] The shock-absorbing sleeve is combined with an active suspension control algorithm, and components such as the piezoelectric deformation ring 3, the capacitor layer 4, and the adjustment ring 20 are adjusted in real time according to parameters such as vehicle speed, mass, and road conditions to optimize the shock-absorbing performance.

[0076] An elastic limit block may also be provided between the reset ring 6 and the outer tube 7 to prevent the reset ring 6 from excessive deformation and thus affecting its service life.

[0077] A dust cover is installed between the inner tube 1 and the outer tube 7 to extend the service life of the seal.

[0078] The inner buffer chamber 9 and the outer buffer chamber 10 can be connected via a throttle hole or a one-way valve to adjust the interaction characteristics of the fluid between the two and optimize the pitch stability performance.

[0079] The third implementation method:

[0080] Figure 1-Figure 10 Shown.

[0081] A working method of a shock-absorbing sleeve for an automobile control arm comprises the following steps;

[0082] S1, primary buffer;

[0083] When an external force acts between the inner tube 1 and the outer tube 7, the multiple inner buffer rings 5, the reset ring 6 and the outer buffer ring 8 are deformed to perform the first buffering.

[0084] S2, secondary buffer;

[0085] During the first buffering process, the liquid working medium in the inner buffer chamber 9, the outer buffer chamber 10, the first reset chamber 11 and the second reset chamber 12 flows through a plurality of connecting pipes 13 between the inner buffer chamber 9, the outer buffer chamber 10, the first reset chamber 11 and the second reset chamber 12 to perform the second buffering;

[0086] S3, deformation power generation;

[0087] When the inner tube 1 and the outer tube 7 are subjected to external force and the first and second buffering occurs, the piezoelectric sheet 14 generates voltage;

[0088] S4, capacitor storage;

[0089] The capacitor layer 4 stores the electrical energy generated by the piezoelectric film 14;

[0090] S5, pressure self-reset;

[0091] When the external force between the inner tube 1 and the outer tube 7 disappears, the inner tube 1 and the outer tube 7 are pushed to reset under the elastic force of the inner buffer ring 5, the reset ring 6 and the outer buffer ring 8, and the pressure of the inner buffer chamber 9, the outer buffer chamber 10, the first reset chamber 11 and the second reset chamber 12;

[0092] S6, damping adjustment;

[0093] When the inner tube 1 and the outer tube 7 are displaced by external force and the piezoelectric sheet 14 is deformed to generate electric energy, the adjusting ring 20 is deformed under the action of voltage. The deformation of the adjusting ring 20 changes the diameter of the through hole in the adjusting ring 20, thereby adjusting the flow of the liquid working medium, thereby achieving damping adjustment.

[0094] S7, power to reset;

[0095] When the inner tube 1 and the outer tube 7 are displaced by external force, the reset sheet 19 is deformed under the action of voltage to push the reset ring 6 to reset.

[0096] S8, automatic adjustment and external control;

[0097] In steps S3 - S7 , in addition to automatic regulation, active control by the controller can also be performed.

[0098] Step S1, primary buffering. When the shock-absorbing sleeve is subjected to an impact load, a relative displacement will occur between the inner tube 1 and the outer tube 7. At this time, the multiple inner buffer rings 5, the reset ring 6 and the outer buffer ring 8 located between the two will undergo elastic deformation, and the deformation of the rubber material will be used to absorb part of the impact energy, thus playing the role of the first buffering and shock absorption.

[0099] Step S2, secondary buffering. While the inner buffer ring 5 and the like are deformed, the liquid working medium filled in the inner buffer chamber 9, the outer buffer chamber 10, the first reset chamber 11 and the second reset chamber 12 will also flow due to the deformation of the cavity. The liquid cavities are connected through the connecting pipe 13, and the liquid can flow between them. The viscous damping generated during the flow dissipates the vibration energy, further attenuates the amplitude, and realizes the second buffering. When a magnetorheological fluid is selected, its viscosity can also be changed by adjusting the strength of the external magnetic field, thereby adjusting the damping force.

[0100] Step S3, deformation power generation. The piezoelectric sheet 14 in the piezoelectric deformation ring 3 has a piezoelectric effect. When it is squeezed or stretched, a potential difference will be generated at both ends to achieve the conversion of mechanical energy into electrical energy. When the shock-absorbing sleeve is deformed by force, the piezoelectric sheet 14 is also deformed and generates voltage.

[0101] Step S4, capacitor storage. The electric energy generated by the piezoelectric sheet 14 is temporarily stored by the capacitor layer 4. The capacitor layer 4 is equivalent to a parallel capacitor, which has an energy storage function and can effectively collect the electric energy generated by the piezoelectric sheet 14 without losing it, so as to supply power to the subsequent active control components.

[0102] Step S5, pressure self-reset. When the external excitation ends and the force between the inner tube 1 and the outer tube 7 disappears, the deformed inner buffer ring 5, reset ring 6 and outer buffer ring 8 will automatically return to the initial state driven by their elastic deformation, pushing the inner tube 1 and the outer tube 7 to reset. At the same time, the deformed liquid cavity such as the inner buffer chamber 9 will also generate pressure due to rebound, further pushing the inner and outer tubes to reset. Multiple reset mechanisms are in parallel, which significantly improves the reset reliability.

[0103] Step S6, damping adjustment. When the shock-absorbing sleeve deforms to generate electrical energy, a portion of the electrical energy can be transmitted to the adjustment ring 20 located in the connecting pipe 13. The adjustment ring 20 is made of electrostrictive material, and will produce axial deformation after power is supplied, thereby changing the diameter of the through hole inside it. The change in the through hole diameter will affect the flow resistance of the liquid working medium, thereby adjusting the current damping force of the shock-absorbing sleeve to achieve semi-active control.

[0104] Step S7, electro-reset. The reset ring 6 is embedded with a plurality of reset sheets 19, which are made of electrostrictive material. When the inner and outer tubes have a large displacement, a voltage can be applied to the reset sheet 19 to cause it to deform, thereby pushing the reset ring 6 to deform, accelerating the reset process of the inner and outer tubes and improving the dynamic response performance.

[0105] Step S8, automatic adjustment and active control. The above steps S3 to S7 can be performed automatically according to the state of the shock-absorbing sleeve itself to achieve adaptive adjustment, or they can be performed purposefully under the command of the controller to achieve active control. By collecting the displacement, acceleration and other signals of the inner and outer tubes through sensors, combined with the control algorithm, the damping force and the reset force can be more accurately regulated.

[0106] Two-stage buffering attenuates impact. The first buffering uses the elastic deformation of the inner buffer ring 5 and other components to absorb energy; the second buffering uses the flow of liquid between the liquid chambers to generate viscous damping, further dissipating vibration and significantly improving the vibration reduction effect.

[0107] Piezoelectric power generation and capacitor energy storage realize self-power supply. The piezoelectric sheet 14 generates electrical energy when the shock-absorbing sleeve is deformed, and the capacitor layer 4 can effectively store electrical energy to meet the power supply requirements of the active control components, reduce the dependence on external power supply, and simplify the system structure.

[0108] Multiple mechanisms ensure reliable reset. Relying on the deformation drive of the inner buffer ring 5, reset ring 6, etc., the liquid cavity pressure push, and the electro-deformation assistance of the reset sheet 19, a multi-pronged approach is used to ensure the rapid and reliable reset of the shock-absorbing sleeve under dynamic conditions.

[0109] Electro-hydraulic coupling realizes semi-active control. The electric energy stored in the capacitor layer drives the adjustment ring 20 to deform, changing the liquid flow resistance, and then adjusting the damping force. Semi-active control is introduced on the basis of passive vibration reduction to further optimize the vibration reduction performance.

[0110] The combination of automatic adjustment and active control has a high level of intelligence. It can automatically adjust the damping force and reset force according to the vibration state, and can also be externally controlled under the command of the controller, which comprehensively improves the intelligence level and adaptability of the shock-absorbing sleeve.

[0111] In addition to the above-mentioned embodiments, the present invention may also have other embodiments, for example, combining the shock-absorbing sleeve with the whole vehicle suspension control strategy, actively adjusting the damping force distribution according to driving conditions, road conditions, vehicle speed and other parameters, and optimizing the vibration reduction and handling performance of the whole vehicle.

[0112] A wear-resistant sleeve is arranged between the inner tube 1 and the outer tube 7 to reduce friction and wear between the two and increase the service life.

[0113] A wireless charging and discharging module is installed between the capacitor layer 4 and the controller to realize wireless power transmission between the shock-absorbing sleeve and the controller, thereby simplifying wiring.

[0114] Nanoparticles are doped into the materials of the reset plate 19 and the adjustment ring 20 to improve their electromechanical coupling performance and accelerate the response speed.

[0115] The gas-liquid two-phase flow of the liquid working medium is optimized, and the gas phase is introduced by setting an elastic diaphragm to adjust the stiffness and damping characteristics of the shock-absorbing sleeve.

[0116] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A shock-absorbing sleeve for an automobile control arm, characterized in that: The invention comprises an inner tube (1), wherein the outer end of the inner tube (1) is fixedly connected to a fixing ring (2), the outer end of the fixing ring (2) is fixedly connected to a piezoelectric deformation ring (3), the outer end of the piezoelectric deformation ring (3) is fixedly connected to a capacitor layer (4), the top and bottom ends of the capacitor layer (4) are fixedly connected to an inner buffer ring (5), the ends of a plurality of the inner buffer rings (5) facing away from the capacitor layer (4) are fixedly connected to a reset ring (6), the outer ends of a plurality of the inner buffer rings (5) and the reset ring (6) are fixedly connected to the same outer tube (7), the inner wall of the outer tube (7) is fixedly connected to a portion between the inner buffer rings (5) and the capacitor layer (4), an inner buffer chamber (9) is formed between the fixing ring (2) and the capacitor layer (4), an outer buffer chamber (10) is formed between the capacitor layer (4), the inner buffer ring (5) and the outer buffer ring (8), and the capacitor layer (4) can be selectively electrically connected to a controller; A first reset chamber (11) is provided in the inner buffer ring (5), a second reset chamber (12) is formed between the inner buffer ring (5) and the reset ring (6), and a liquid working medium is filled between the inner buffer chamber (9), the outer buffer chamber (10), the first reset chamber (11) and the second reset chamber (12), wherein the liquid working medium may be hydraulic oil or magnetorheological fluid material.

2. The shock-absorbing sleeve for an automobile control arm according to claim 1, characterized in that: A connecting pipe (13) is fixedly connected between the first reset chamber (11) and the inner buffer chamber (9), the outer buffer chamber (10) and the second reset chamber (12); the inner buffer ring (5), the reset ring (6) and the outer buffer ring (8) are all made of high-elasticity rubber.

3. The shock-absorbing sleeve for a vehicle control arm according to claim 1, characterized in that: The piezoelectric deformation ring (3) comprises a piezoelectric sheet (14), the top and bottom ends of the piezoelectric sheet (14) are fixedly connected with a reset shoe (15), the piezoelectric sheet (14) is made of elastic material, and the reset shoe (15) is made of piezoelectric material.

4. The shock-absorbing sleeve for an automobile control arm according to claim 3, characterized in that: The capacitor layer (4) comprises a first conductor layer (16) fixedly connected to the piezoelectric sheet (14); the outer end of the first conductor layer (16) is fixedly connected to an insulating layer (17); the outer end of the insulating layer (17) is fixedly connected to a second conductor layer (18); the first conductor layer (16), the insulating layer (17) and the second conductor layer (18) form a capacitor.

5. The shock-absorbing sleeve for an automobile control arm according to claim 3, characterized in that: The two levels of the reset shoe (15) are electrically connected to the first conductor layer (16) and the second conductor layer (18) respectively; a plurality of reset plates (19) are embedded in the reset ring (6); and the plurality of reset plates (19) are electrically connected to the capacitor layer (4).

6. The shock-absorbing sleeve for an automobile control arm according to claim 2, characterized in that: An adjusting ring (20) is arranged inside the connecting pipe (13), and both ends of the adjusting ring (20) are conical structures, and the ends with larger diameters of the conical structures are arranged close to each other.

7. The shock-absorbing sleeve for an automobile control arm according to claim 5, characterized in that: The reset sheet (19) and the adjustment ring (20) are both made of an electro-telescopic material, and the adjustment ring (20) is electrically connected to the capacitor layer (4).

8. The shock-absorbing sleeve for an automobile control arm according to claim 2, characterized in that: The inner wall of the connecting tube (13) is provided with a groove matching the outer end of the adjusting ring (20), and a gap of 0.5-1 mm is reserved between the groove and the adjusting ring (20). The adjusting ring (20) is provided with a through hole, and the diameter of the through hole is smaller than the inner diameter of the connecting tube (13).

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