Deformation power generation device used in tire
By setting up multiple groups of dual piezoelectric vibrator components on the inner surface of the tire and using main and auxiliary rectifiers and hysteresis comparator control circuits, the problems of low efficiency and easy damage of existing tire deformation power generation devices are solved, and efficient power generation and stable power supply are achieved.
Patent Information
- Application Number
- CN202422894988.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-10-14
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Existing tire deformation power generation devices have low power generation capacity, low conversion efficiency, are easily damaged, and cannot meet the standards for instantaneous emission current of the transmitting chip.
Multiple groups of piezoelectric vibrator assemblies are arranged on the circumference of the inner surface of the tire. Each group includes multiple dual piezoelectric vibrators. The dual piezoelectric vibrators are evenly spaced and staggered, and are divided into main and auxiliary dual piezoelectric vibrators. Through the main and auxiliary rectifiers, filters and hysteresis comparator control circuits, efficient power generation and energy storage are achieved.
The power generation conversion efficiency is improved, the service life of the piezoelectric vibrator is extended, the instantaneous emission current demand of the emission chip can be met, the circuit works safely and reliably, and power is saved.
Smart Images
Figure CN223437033U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power generation device technical field especially is related to a kind of deformation power generation device for inside tire. BACKGROUND
[0002] The deformation power generation device inside tire utilizes piezoelectric effect to generate electric energy, simply, piezoelectric material will change shape under the action of external vibration, thereby causing internal stress change, further leading to internal charge displacement, finally generating electric field;When automobile travels, tire is constantly rolling on ground, due to the pressure of automobile, the part of tire contacting with ground changes from arc to tend to be flat, in addition, due to the unevenness of part of road surface, the vibration of automobile in running and the operation of engine also can cause vibration, these mechanical energy also provides condition for piezoelectric conversion of generator using piezoelectric material.
[0003] The electric energy generated by power generation device is stored in energy storage power supply, and then supplied to other load, for example, the transmitting chip of tire pressure monitoring system, transmitting chip is located in hub, emits wireless signal to receiving module in vehicle body, with the characteristics of intermittent power consumption and large instantaneous transmitting current;The deformation power generation device inside existing tire has small power generation capacity, low conversion efficiency, cannot store electric energy, thereby cannot reach the standard of instantaneous transmitting current of transmitting chip, and in the process of road travel, when tire meets larger obstacle, thereby generating larger deformation that bulges inward, easy to damage power generation device.
[0004] Therefore, the present application provides a deformation power generation device for inside tire to solve the problems in the background art. SUMMARY
[0005] The utility model discloses a deformation power generation device for inside tire, which solves the problems of low conversion efficiency of existing power generation device, easy damage of power generation device when tire meets larger obstacle and the like.
[0006] To solve the above technical problems, the utility model provides a deformation power generation device for inside tire, which comprises a plurality of piezoelectric vibrator assemblies arranged on the inner surface of the tire, and the piezoelectric vibrator assemblies are arranged in at least 8 groups.
[0007] Further improvement of the technical solution of the utility model is that the directions of the plurality of double piezoelectric vibrators in each group are along the arc direction of the inner surface of the tire.
[0008] The further improvement of the utility model technical scheme lies in that: each double piezoelectric vibrator comprises two piezoelectric chips, the elastic gasket is arranged in the middle of the two piezoelectric chips and is glued, one end of the elastic gasket is fixed to the inner surface of the tire, and the other end is a free end.
[0009] The further improvement of the utility model technical scheme lies in that: the piezoelectric vibrator assembly in each group is filled with protective rubber.
[0010] The further improvement of the utility model technical scheme lies in that: the transmitting chip is arranged on the hub in the middle of the tire.
[0011] The further improvement of the utility model technical scheme lies in that: the double piezoelectric vibrator in each group is arranged as at least 6, the number of the double piezoelectric vibrator is n, the n double piezoelectric vibrators are divided into two parts, one part is 2 auxiliary double piezoelectric vibrators, and the other part is n-2 main double piezoelectric vibrators.
[0012] The further improvement of the utility model technical scheme lies in that: after the n-2 main double piezoelectric vibrators in each group are connected in parallel, the main rectifier is electrically connected, the main rectifier is electrically connected with the energy storage power supply, the energy storage power supply is electrically connected with the transmitting chip; the main double piezoelectric vibrator provides working voltage for the transmitting chip.
[0013] The further improvement of the utility model technical scheme lies in that: after the 2 auxiliary double piezoelectric vibrators in each group are connected in parallel, the auxiliary rectifier is electrically connected, the auxiliary rectifier is electrically connected with the filter, the filter is electrically connected with the hysteresis comparator, and the hysteresis comparator is electrically connected with the energy storage power supply; the auxiliary double piezoelectric vibrator is used for controlling the opening or closing of the loop of the main double piezoelectric vibrator for supplying power to the transmitting chip.
[0014] The further improvement of the utility model technical scheme lies in that: a plurality of flexible rods are arranged in a circumferential array between the tire and the hub, at least one bending part is arranged on each flexible rod, and a double piezoelectric vibrator is arranged at each bending part.
[0015] The above technical scheme is adopted, and the utility model has the following beneficial effects:
[0016] 1、 the utility model provides a kind of deformation power generation device for tire, the power generation device sets multiple piezoelectric vibrator assemblies, and multiple piezoelectric vibrator assemblies are distributed in the inner surface of tire in circumferential array, and the double piezoelectric vibrator of piezoelectric vibrator assembly has formed bending deformation when being embedded in tire, and when tire contacts ground, the part of tire contacting ground becomes flat from arc, and double piezoelectric vibrator also becomes flat, thereby completing once flexural vibration;In the stage of leaving ground, double piezoelectric vibrator restores bending state again, and with tire constantly rotating and driving, waveform signal alternates, and it is beneficial to carry out continuous power generation, and conversion efficiency is high.
[0017] 2. The deformation power generation device for use in a tire, each group of piezoelectric vibrator assemblies has multiple double piezoelectric vibrators uniformly and staggeredly distributed, the distance between the two adjacent double piezoelectric vibrators is staggered, the distribution length of each group of piezoelectric vibrator assemblies is lengthened under the premise that the length of a single double piezoelectric vibrator is not exceeded, the distance between the two adjacent groups of piezoelectric vibrator assemblies is reduced, which is conducive to better coupling of the output waveform and more similar to direct current; in addition, the tire encounters a large obstacle during driving, thereby generating a large deformation that protrudes inward and is easy to damage the double piezoelectric vibrators, the multiple double piezoelectric vibrators of each group are uniformly and staggeredly distributed, which avoids damaging all double piezoelectric vibrators of one group when the tire encounters a large deformation, and the remaining undamaged double piezoelectric vibrators can also continuously supply power to the transmitting chip, which is conducive to improving the service life of the piezoelectric vibrator assembly.
[0018] 3. The deformation power generation device for use in a tire, n double piezoelectric vibrators are divided into two parts, one part is two auxiliary double piezoelectric vibrators, and the other part is n-2 main double piezoelectric vibrators, the double piezoelectric vibrators are divided into two parts of main double piezoelectric vibrators and auxiliary double piezoelectric vibrators, the operation of the electric power control circuit is generated by the auxiliary double piezoelectric vibrators, the loop of the main double piezoelectric vibrators supplying power to the transmitting chip can be opened and closed, which is conducive to making the energy storage power source leak-free charging and energy storage, when the energy storage power source reserves power reaches the working load requirement, the energy storage power source is rapidly connected to the transmitting chip to output power, which can meet the standard of the instantaneous transmitting current of the transmitting chip.
[0019] 4. The deformation power generation device for use in a tire, the alternating voltage generated by the main double piezoelectric vibrators with vibration is connected to the main rectifier for charging and energy storage of the energy storage power source, the alternating current generated by the auxiliary double piezoelectric vibrators is connected to the auxiliary rectifier, and after filtering by the filter, the alternating current becomes direct current, and then the hysteresis comparator synchronously controls the transmitting chip to intermittently wake up and transmit to provide a higher working current; specifically, the hysteresis comparator monitors the voltage of the energy storage power source, controls the switch output when the pre-set highest threshold voltage is reached, and turns off only when the voltage on the energy storage power source is lower than the lowest threshold voltage, so that the circuit is safe and reliable in operation, power is saved, and the power generation capacity is large. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.
[0021] Figure 1 It is a structural schematic view of a deformation power generation device for use in a tire.
[0022] Figure 2 For Figure 1 Enlarged schematic view of part A in the middle;
[0023] Figure 3 The installation schematic diagram of the tire inner surface piezoelectric vibrator assembly of the utility model;
[0024] Figure 4 The structure schematic diagram of the tire double piezoelectric vibrator of the utility model;
[0025] Figure 5 The electrical connection relationship schematic diagram of the power generation device of the utility model;
[0026] Figure 6 The structure schematic diagram of the flexible rod and the double piezoelectric vibrator of the utility model.
[0027] Reference signs: 1, tire; 2, piezoelectric vibrator assembly; 21, double piezoelectric vibrator; 211, piezoelectric wafer; 212, elastic gasket; 22, protective rubber; 23, auxiliary double piezoelectric vibrator; 24, main double piezoelectric vibrator; 3, hub; 4, transmitting chip; 5, flexible rod. DETAILED DESCRIPTION
[0028] The technical scheme of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiments are a part of the embodiments of the utility model, instead of all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.
[0029] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship based on the drawing shown, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation structure and operation, therefore, cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the description purpose, and cannot be understood as indicating or implying relative importance.
[0030] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0031] The present invention will be further explained below in conjunction with specific implementation methods.
[0032] Example 1
[0033] like Figures 1-3 As shown, the present embodiment provides a deformation power generation device for use in a tire 1, comprising a plurality of piezoelectric vibrator assemblies 2 arranged circumferentially on the inner surface of the tire 1, wherein the piezoelectric vibrator assemblies 2 are arranged in at least 8 groups, and the plurality of piezoelectric vibrator assemblies 2 are evenly distributed. Each group of piezoelectric vibrator assemblies 2 is filled with a protective rubber 22, which extends to the inner circumference and inner side of the tire 2, and has a stronger supporting force for the tire 2. The protective rubber 22 is used to protect the piezoelectric vibrator assemblies 2 and prevent the piezoelectric vibrator assemblies 2 from being damaged by a tire blowout. The power generation device is provided with a plurality of piezoelectric vibrator assemblies 2. Part 2, multiple groups of piezoelectric vibrator assemblies 2 are distributed in a circular array on the inner surface of the tire 1. The dual piezoelectric vibrators 21 of the piezoelectric vibrator assembly 2 have formed a bending deformation when embedded in the tire 1. Whenever the tire 1 contacts the ground, due to the pressure of the car, the part of the tire 1 in contact with the ground becomes straight from an arc, and the dual piezoelectric vibrators 21 also become straight, thereby completing a flexural vibration; when leaving the ground, the dual piezoelectric vibrators 21 return to the curved state. As the tire 1 continues to rotate and drive, the waveform signal alternates, which is conducive to continuous power generation.
[0034] like Figure 1 As shown, in this embodiment, a transmitter chip 4 is mounted on the hub 3 in the center of the tire 1. The power generated by the generator is stored in a power supply and then supplied to the transmitter chip 4. The transmitter chip 4 operates at a voltage of 3 to 6V and consumes only 8uA when in sleep mode. When in operation, it can be awakened within a few seconds and requires a transmission current of approximately 10mA for a transmission time of 10ms. This results in intermittent power consumption and high instantaneous transmission current. The generator of this utility model provides power for the transmitter chip 4.
[0035] like Figures 1-4As shown, in the embodiment, each group of piezoelectric vibrator assembly 2 includes a plurality of double piezoelectric vibrator 21, and the plurality of double piezoelectric vibrator 21 is uniformly spaced and staggered. In the embodiment, 8 groups of piezoelectric vibrator assembly 2 are provided, and each group of piezoelectric vibrator assembly 2 is provided with 6 double piezoelectric vibrator 21, so that a total of 48 double piezoelectric vibrator 21 is provided. The large number of double piezoelectric vibrator 21 enhances the support of the tire and prevents tire blowout. The direction of the plurality of double piezoelectric vibrator 21 of each group is along the arc direction of the inner surface of the tire 1. Each double piezoelectric vibrator 21 includes two piezoelectric sheets 211, and an elastic gasket 212 is glued between the two piezoelectric sheets 211. One end of the elastic gasket 212 is fixed to the inner surface of the tire 1, and the other end is a free end. When the free end is subjected to mechanical load, it will be deflected and deformed, and the electrode can output electrical energy outward. The plurality of double piezoelectric vibrator 21 of each group of piezoelectric vibrator assembly 2 is uniformly spaced and staggered, and the distance between the two adjacent double piezoelectric vibrator 21 is staggered. On the premise that the longest length of a single double piezoelectric vibrator 21 is not exceeded, the distribution length of each group of piezoelectric vibrator assembly 2 is lengthened, and the distance between the two adjacent groups of piezoelectric vibrator assembly 2 is reduced. This is conducive to better coupling of the output waveform and more similar to direct current. In addition, during the driving process of the tire 1, a large obstacle is encountered, thereby generating a large inward bulging deformation, which is easy to damage the double piezoelectric vibrator 21. The plurality of double piezoelectric vibrator 21 of each group is uniformly spaced and staggered, which avoids damaging all double piezoelectric vibrator 21 of one group when the tire 1 encounters a large deformation. The remaining undamaged double piezoelectric vibrator 21 can also continuously power the transmitting chip 4, which is conducive to improving the service life of the piezoelectric vibrator assembly 2.
[0036] As shown in Figure 1 , Figure 4 In the embodiment, the number of double piezoelectric vibrator 21 of each group is at least 6, and the number of double piezoelectric vibrator 21 is n. The n double piezoelectric vibrator 21 is divided into two parts, one part is 2 auxiliary double piezoelectric vibrator 23, and the other part is n-2 main double piezoelectric vibrator 24. The double piezoelectric vibrator 21 is divided into main double piezoelectric vibrator 24 and auxiliary double piezoelectric vibrator 23, and the operation of the auxiliary double piezoelectric vibrator 23 generates electrical power control circuit. The circuit can open and close the power supply loop of the main double piezoelectric vibrator 24 to the transmitting chip 4, which is conducive to making the energy storage power source leak-free charging and energy storage. When the energy storage power source reserves power reaches the working load requirement, the energy storage power source is quickly connected to the transmitting chip 4 to output power, which can meet the standard of the instantaneous emission current of the transmitting chip 4.
[0037] As shown in Figure 5As shown, in this embodiment, each group of n-2 main bi-piezoelectric vibrators 24 are connected in parallel and electrically connected to a main rectifier. The parallel connection method has a large output charge and a large time constant, and is used to measure slowly changing signals. The parallel connection method is more suitable for the requirements of wireless transmission. The main rectifier is electrically connected to an energy storage power supply, which is electrically connected to the transmitter chip 4; the main bi-piezoelectric vibrators 24 provide operating voltage for the transmitter chip 4. The two auxiliary bi-piezoelectric vibrators 23 in each group are connected in parallel and electrically connected to an auxiliary rectifier, which is electrically connected to a filter, which is electrically connected to a hysteresis comparator, which is electrically connected to the energy storage power supply; the auxiliary bi-piezoelectric vibrators 23 are used to control the opening or closing of the circuit that powers the main bi-piezoelectric vibrators 24 to supply power to the transmitter chip 4. The alternating voltage generated by the vibration of the main bi-piezoelectric vibrator 24 is connected to the main rectifier for rectification, charging and storing the energy storage power supply. The alternating current generated by the auxiliary bi-piezoelectric vibrator 23 is connected to the auxiliary rectifier, filtered by the filter, converted to DC, and then synchronously controlled by the hysteresis comparator to intermittently wake up and transmit the transmitting chip 4, providing a high operating current. Specifically, the hysteresis comparator monitors the voltage of the energy storage power supply and controls the switch output when it reaches a preset maximum threshold voltage. It does not shut down until the voltage on the energy storage power supply falls below the minimum threshold voltage. This circuit operates safely and reliably, saves power, and generates a large amount of power. The main rectifier, auxiliary rectifier, energy storage power supply, filter, and hysteresis comparator in the circuit are integrated into the transmitting chip 4, all located on the hub 3, saving space.
[0038] Example 2
[0039] like Figure 6 As shown, the difference between this embodiment and embodiment 1 is that: a plurality of groups of piezoelectric vibrator assemblies 2 are arranged in a circumferential array between the tire 1 and the wheel hub 3, and the piezoelectric vibrator assemblies 2 are arranged in at least 8 groups. The plurality of piezoelectric vibrator assemblies 2 are evenly distributed, and each group of piezoelectric vibrator assemblies 2 includes a plurality of flexible rods 5 that are evenly spaced and staggered along the axial direction of the tire 1, and each flexible rod 5 is provided with at least one bend, and each bend is provided with a dual piezoelectric vibrator 21; the dual piezoelectric vibrator 21 has formed a bending deformation when embedded in the tire 1. Whenever the tire 1 contacts the ground, due to the pressure of the car, the distance between the tire 1 and the wheel hub 3 is shortened, and the bend of the flexible rod 5 becomes more curved, thereby completing a flexural vibration; in the stage of leaving the ground, the dual piezoelectric vibrator 21 returns to its previous bending state. As the tire 1 continues to rotate and travel, the waveform signal appears alternately, which is conducive to continuous power generation.
[0040] The embodiment sets 8 piezoelectric vibrator assemblies 2, each piezoelectric vibrator assembly 2 is provided with 3 double piezoelectric vibrators 21, so a total of 24 double piezoelectric vibrators 21 are provided, the length of the double piezoelectric vibrator 21 of the embodiment is longer than that of the double piezoelectric vibrator 21 of the embodiment 1, so the flexural vibration is more intense, and the power generation of a single double piezoelectric vibrator 21 is larger, the embodiment can be combined with the embodiment 1 to set the double piezoelectric vibrator 21 in two ways to generate power, and energy can be captured at the same time, so that the overall energy conversion efficiency is improved.
[0041] The working principle of the technical scheme provided by the utility model in use is as follows:
[0042] During the driving process of the automobile, the part of the tire 1 in contact with the ground changes from an arc shape to a flat shape, and a plurality of piezoelectric vibrator assemblies 2 are distributed in a circumferential array on the inner surface of the tire 1, so that the shape of the piezoelectric vibrator assembly 2 changes with the shape of the tire 1, and the double piezoelectric vibrator 21 of the piezoelectric vibrator assembly 2 has already formed a bending deformation when being embedded in the tire 1, and the double piezoelectric vibrator 21 restores the bending state in the stage of leaving the ground, with the tire 1 continuously rotating and driving, the waveform signal alternately appears, and continuous power generation is carried out. The plurality of double piezoelectric vibrators 21 of each piezoelectric vibrator assembly 2 are uniformly and interval distributed, so that the tire 1 can avoid encountering a larger deformation to damage all double piezoelectric vibrators 21 of one group during driving, and the undamaged double piezoelectric vibrators 21 can also continuously supply power to the transmitting chip 4.
[0043] The n-2 main double piezoelectric vibrators 24 of each group are connected in parallel, and are electrically connected to a main rectifier; the alternating voltage generated by the main double piezoelectric vibrator 24 is connected to the main rectifier to charge and store energy in the energy storage power supply; the 2 auxiliary double piezoelectric vibrators 23 of each group are connected in parallel, and are electrically connected to an auxiliary rectifier; the alternating current generated by the auxiliary double piezoelectric vibrator 23 is connected to the auxiliary rectifier, is filtered by a filter to become direct current, and then is synchronously controlled by a hysteresis comparator to intermittently wake up and transmit the transmitting chip 4 to provide a higher working current; specifically, the hysteresis comparator monitors the voltage of the energy storage power supply, controls the switch output when the voltage reaches the pre-set highest threshold voltage, rapidly connects the energy storage power supply to the transmitting chip 4 to output power, can meet the instantaneous transmission current standard of the transmitting chip 4, and is turned off only when the voltage on the energy storage power supply is lower than the lowest threshold voltage to carry out a new round of charging and energy storage.
[0044] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.
Claims
1. A deformation power generation device for use in a tire, characterized in that: The invention comprises a plurality of groups of piezoelectric vibrator assemblies (2) arranged on the circumference of the inner surface of a tire (1), wherein the piezoelectric vibrator assemblies (2) are arranged in at least 8 groups, the plurality of groups of piezoelectric vibrator assemblies (2) are evenly distributed, and each group of piezoelectric vibrator assemblies (2) comprises a plurality of bi-piezoelectric vibrators (21), and the plurality of bi-piezoelectric vibrators (21) are evenly spaced and staggered.
2. The deformation power generation device for use in a tire according to claim 1, characterized in that: The directions of the multiple dual piezoelectric vibrators (21) in each group are all along the arc direction of the inner surface of the tire (1).
3. The deformation power generation device for use in a tire according to claim 1, characterized in that: Each bi-piezoelectric vibrator (21) comprises two piezoelectric chips (211), an elastic gasket (212) is glued between the two piezoelectric chips (211), one end of the elastic gasket (212) is fixed to the inner surface of the tire (1), and the other end is a free end.
4. The deformation power generation device for use in a tire according to claim 1, characterized in that: Each group of piezoelectric vibrator components (2) is filled with protective rubber (22).
5. The deformation power generation device for use in a tire according to claim 1, characterized in that: A transmitting chip (4) is provided on a hub (3) in the middle of the tire (1).
6. The deformation power generation device for use in a tire according to claim 1, characterized in that: Each group of bi-piezoelectric vibrators (21) is set to at least 6, and the number of bi-piezoelectric vibrators (21) is set to n. The n bi-piezoelectric vibrators (21) are divided into two parts, one part is two auxiliary bi-piezoelectric vibrators (23), and the other part is n-2 main bi-piezoelectric vibrators (24).
7. The deformation power generation device for use in a tire according to claim 6, characterized in that: After the n-2 main dual piezoelectric vibrators (24) of each group are connected in parallel, they are electrically connected to a main rectifier, the main rectifier is electrically connected to an energy storage power supply, and the energy storage power supply is electrically connected to a transmitting chip (4); the main dual piezoelectric vibrators (24) provide an operating voltage for the transmitting chip (4).
8. The deformation power generation device for use in a tire according to claim 6, characterized in that: After the two auxiliary bi-piezoelectric vibrators (23) of each group are connected in parallel, they are electrically connected to the auxiliary rectifier, the auxiliary rectifier is electrically connected to the filter, the filter is electrically connected to the hysteresis comparator, and the hysteresis comparator is electrically connected to the energy storage power supply; the auxiliary bi-piezoelectric vibrator (23) is used to control the opening or closing of the circuit of the main bi-piezoelectric vibrator (24) supplying power to the transmitting chip (4).
9. The deformation power generation device for use in a tire according to claim 5, characterized in that: A plurality of groups of piezoelectric vibrator assemblies (2) are arranged in a circumferential array between the tire (1) and the wheel hub (3), the piezoelectric vibrator assemblies (2) being arranged in at least 8 groups, the plurality of groups of piezoelectric vibrator assemblies (2) being evenly distributed, and each group of piezoelectric vibrator assemblies (2) comprising a plurality of flexible rods (5) evenly spaced and staggered along the axial direction of the tire (1), each flexible rod (5) being provided with at least one bend, and each bend being provided with a dual piezoelectric vibrator (21).