CN110635715A - Vehicle tire vibration energy collection device and vehicle - Google Patents

Abstract

The invention discloses a vehicle tire vibration energy collection device, which is installed on the wheel hub and spoke of the vehicle tire. The device comprises: a first fixing unit, a second fixing unit, a cantilever beam, a piezoelectric element, a first magnet and a second magnet The first fixed unit is connected with the wheel hub spoke and the tail of the cantilever beam, and the first magnet is arranged on the head of the cantilever beam; the piezoelectric element is arranged on the cantilever beam; the second fixed unit is connected with the wheel hub spoke and the second magnet, The first magnet and the second magnet are arranged correspondingly to form a magnetic field; under the joint action of the magnetic field and the rotation of the wheel, the cantilever beam vibrates and deforms to make the piezoelectric element generate electric energy. The invention also discloses a vehicle. The vehicle tire vibration energy collection device is installed on the wheel hub and spoke of the vehicle tire. By adopting the bistable structure, the invention makes the structure simple and the power generation efficiency high, improves the stability of the vehicle tire energy collection device, reduces the requirement on the roughness of the road surface and expands the vehicle speed range in which the rotational energy can be collected.

Description

Vehicle tire vibration energy collection device and vehicle

technical field

The invention relates to the field of energy collection, in particular to a vehicle tire vibration energy collection device and a vehicle.

Background technique

During the running of the vehicle, energy is dissipated in various forms along with the rotation of the tires. In order to collect these energies and convert them into usable electrical energy, researchers have proposed various schemes. The principles used in these schemes mainly include piezoelectric, electromagnetic and electrostatic.

Most researchers use a "piezoelectric" approach to harvest energy in the tire's rotating environment. Among them, some researchers proposed a "linear" MEMS energy recovery device, which collects the impact energy of the ground on the tire and converts it into electrical energy. As a traditional method, the electromagnetic method is used by many researchers to harvest tire energy by utilizing the relative motion between the coil and the magnet to generate electric energy. However, this device is not effective when the vehicle speed is low, and has certain requirements on the roughness of the road surface.

The "electromagnetic" energy harvesting device uses the static structure inside the tire to fix the magnet on the tire, and the coil is fixed on the static part inside the tire to realize the relative movement between the coil and the magnet. This type of energy recovery device is convenient in design, simple in structure, and easy to control the output power during design. However, the energy recovery efficiency of the electromagnetic energy recovery device is not high, it depends on the high rotation speed of the tire, and the effect is not good at low speed.

The electrostatic energy recovery device collects the current caused by the change of capacitance between the electrodes. Some researchers have proposed an electrostatic energy recovery device composed of electret and interdigitated electrodes. This device transmits the vibration of the tire to the interdigital electrodes, causing the interdigital electrodes to vibrate, repeatedly changing the gap between the interdigital electrodes and the electret, and then triggering the generation of electric current. This type of energy harvesting device can output relatively large power. However, this large output power often depends on the extremely small gap between the electret and the interdigital electrodes, and it is usually not easy to maintain this small gap, especially in complex working conditions such as vehicle tires. It is difficult to maintain stability, so the stability of this type of energy harvesting device needs to be improved.

Contents of the invention

The object of the present invention is to provide a vehicle tire vibration energy harvesting device and a vehicle, improve the stability of the vehicle tire vibration energy harvesting device, reduce the requirement for roughness of the road surface and expand the vehicle speed range in which rotational energy can be collected.

To achieve the above object, the present invention provides the following scheme:

A vehicle tire vibration energy harvesting device installed on the wheel hub and spoke of the vehicle tire, the vehicle tire vibration energy harvesting device includes: a first fixing unit, a second fixing unit, a cantilever beam, a piezoelectric element, a first magnet and second magnet;

The first fixing unit is connected to the spoke of the wheel hub, the first fixing unit is fixedly connected to the tail of the cantilever beam, and the first magnet is arranged on the head of the cantilever beam; and the cantilever beam The piezoelectric element is provided on it;

The second fixing unit is connected to the hub spoke, and the second fixing unit is connected to the second magnet, and the first magnet and the second magnet are arranged correspondingly to form a magnetic field; in the magnetic field Under the combined action of rotation of the cantilever beam and the rotation of the wheel, the cantilever beam vibrates and deforms so that the piezoelectric element generates electric energy.

Preferably, the vehicle tire vibration energy harvesting device further includes an energy storage unit, the energy storage unit is installed on the hub spoke of the vehicle tire, the energy storage unit is connected to the piezoelectric element, and the energy storage unit The energy unit is used for storing the electric energy generated by the piezoelectric element.

Preferably, the energy storage unit is a capacitor, and the capacitor is connected in parallel with the piezoelectric element.

Preferably, the vehicle tire vibration energy harvesting device further includes a conductive slip ring, and the conductive slip ring includes: an inner ring, an outer ring, an inner ring terminal and an outer ring terminal, and the outer ring is sleeved on the inner ring. On the ring, the outer ring terminal is connected to the outer ring, the inner ring terminal is connected to the inner ring, and the inner ring terminal is also connected to the energy storage unit.

Preferably, the rotation center of the conductive slip ring is at the same position as the axis of the wheel hub of the vehicle tire.

Preferably, the hub spokes of the vehicle tire are provided with a plurality of hub grooves, and the first fixing unit or the second fixing unit is arranged in each of the hub grooves.

Preferably, both the first fixing unit and the second fixing unit are lifting lugs.

Preferably, the cantilever beam is elongated.

Preferably, the piezoelectric element includes two piezoelectric ceramic sheets, and the two piezoelectric ceramic sheets are respectively arranged on opposite sides of the cantilever beam.

To achieve the above object, the present invention also discloses the following technical solutions:

A vehicle includes the above-mentioned vehicle tire vibration energy collection device, the vehicle tire vibration energy collection device is installed on the wheel hub and spoke of the tire of the vehicle.

According to the specific embodiments provided by the invention, the invention discloses the following technical effects:

The invention provides a vehicle tire vibration energy collection device and a vehicle, adopting a structure in which magnets are relatively installed to form a relative magnetic field, and when the vehicle tire rotates or generates vibration energy, the deformation of the cantilever beam is used to compress the deformation of the piezoelectric element, In this way, the piezoelectric sheet generates electric energy and converts the vibration energy of the vehicle tire into electric energy. Rotational energy is a problem with smaller vehicle speed ranges.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is the structural diagram of vehicle tire vibration energy harvesting device of the present invention;

Fig. 2 is the structure and installation location diagram of the vehicle tire vibration energy harvesting device of the present invention;

Fig. 3 is a structural diagram of a first fixing unit provided by an embodiment of the present invention;

FIG. 4 is a structural diagram of a second fixing unit provided by an embodiment of the present invention;

Fig. 5 is a structure diagram of the conductive slip ring of the present invention.

Symbol Description:

The first fixed unit—1, the second fixed unit—2, the cantilever beam—3, the first magnet—4, the second magnet—5, the piezoelectric element—6, the vehicle tire—7, the hub spoke—8, the hub groove —9, conductive slip ring—10, energy storage element—11, inner ring—12, outer ring—13, inner ring terminal—14, outer ring terminal—15.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The object of the present invention is to provide a vehicle tire vibration energy collection device and a vehicle, which convert the vibration energy of the vehicle tire into electric energy, have a simple structure, high power generation efficiency, effectively improve the stability of the vehicle tire vibration energy collection device, and reduce the impact on rough road surfaces. and expand the range of vehicle speeds in which rotational energy can be harvested.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is the structural diagram of vehicle tire vibration energy collection device of the present invention, as shown in Figure 1, vehicle tire vibration energy collection device of the present invention comprises first fixed unit 1, the second fixed unit 2, cantilever beam 3, piezoelectric element 6 , the first magnet 4 and the second magnet 5.

The first fixing unit 1 is connected to the hub spoke 8 , and the first fixing unit 1 is fixedly connected to the tail of the cantilever beam 3 .

The hub spokes 8 are provided with a plurality of hub grooves 9 to facilitate the adjustment of the positions of the first fixing unit 1 and the second fixing unit 2 .

The first fixing unit 1 and the second fixing unit 2 are arranged in the hub groove 9 and slide in the hub groove 9 .

In this embodiment, the first fixing unit 1 is a lifting lug, and its specific structure is shown in FIG. 3 . The first fixing unit 1 includes a first metal plate and a second metal plate. The first metal plate One end of the metal plate is vertically connected with one end of the second metal plate, and two holes are provided on the first metal plate for fixing the cantilever beam 3 and the piezoelectric element 6 by means of bolts, and on the second metal plate Two holes are opened for fixing the first fixing unit 1 on the hub groove 9 .

The second fixing unit 2 is connected to the hub spoke 8, and the second fixing unit 2 is connected to the second magnet 5, and the first magnet 4 and the second magnet 5 are arranged correspondingly to form Magnetic field: under the joint action of the magnetic field and the rotation of the wheel, the cantilever beam 3 vibrates and deforms to make the piezoelectric element 6 generate electric energy.

In this embodiment, the second fixing unit 2 is a lifting lug, and its specific structure is shown in FIG. 4 . The second fixing unit 2 includes a third metal plate and a fourth metal plate. The third metal plate One end of one end is vertically connected with one end of the fourth metal plate, and two holes are opened on the fourth metal plate for fixing the second fixing unit 2 on the hub groove 9 .

The first magnet 4 is arranged on the head of the cantilever beam 3 ; the piezoelectric element 6 is arranged on the cantilever beam 3 .

The cantilever beam 3 is long and has a length of 0.08m; the specific parameters of the cantilever beam 3 are: the damping coefficient is 0.08N/m/s, and the stiffness is 152.7N/m.

When the vehicle is stationary and free from external force, the first magnet 4 , the second magnet 5 and the cantilever beam 3 are located on the same straight line.

Under the combined action of the repulsive force between the magnets and the gravitational force on the magnets, the first magnet 4 will generate a relative displacement, so that the piezoelectric element 6 is compressed and deformed to generate electric energy.

The long side of the cantilever beam 3 is in the same direction as the diameter of the vehicle tire 7. When the vehicle is running normally, the bending of the cantilever beam 3 will generate elastic force. Under the joint action of the elastic force and the repulsive force between the magnets, the electric energy generated by the piezoelectric element 6 will exhibit non-linear characteristics. When the distance d between the two magnets is adjusted to a proper value, the present invention will have two potential wells of equal depth, forming a bistable non-linear structure. The parameters of the first magnet 4 and the second magnet 5 are the same, and the magnetic poles are opposite to each other, so as to generate a repulsive force between the magnets.

After multiple experiments and analysis, the proper value of the distance d between the first magnet 4 and the second magnet 5 is 5 cm, at this time, the energy harvesting device has the highest energy harvesting efficiency.

The first magnet 4 and the second magnet 5 are Y26H-2 type sintered permanent ferrite magnets, the specific parameters of which are: length 30mm, width 20mm, height 20mm, coating of chemical nickel, quality 0.08 m.

The piezoelectric element 6 includes two piezoelectric ceramic sheets, and the two piezoelectric ceramic sheets are respectively arranged on opposite sides of the cantilever beam 3 .

The model of the piezoelectric ceramic sheet is NAC2015, and its parameters are as follows: the length is 10mm, the width is 10mm, the height is 2mm, the driving voltage is 150V, the displacement is 3.3μm±15%, the electrostatic capacity is 760nf±15%, the resonance frequency It is 486khz±20%, the stiffness is 1273N/μm±20%, and the thrust is 4200N±20%.

In order to store the electrical energy generated by the piezoelectric element 6 and store it in a storage battery or supply power to various small sensors on the vehicle, the vehicle tire vibration energy harvesting device of the present invention also includes an energy storage element 11 .

As shown in Figure 2, the energy storage element 11 is installed on the hub spoke 8 of the vehicle tire 7, the energy storage element 11 is connected with the piezoelectric element 6, and the energy storage element 11 is used to store the Electric energy generated by the piezoelectric element 6. The energy storage element 11 is directly welded on the wheel hub by soldering.

In this embodiment, the energy storage element 11 is a capacitor, and the capacitor is connected in parallel with the piezoelectric element 6 . The capacitor is installed on the tire of the vehicle, and is directly welded on the tire of the vehicle by means of soldering.

The specific parameters of the capacitor are as follows: the model is AP-2R5J256UY, the capacity is 25F, the rated voltage is 2.5V, the surge voltage is 2.65V, the diameter is 16mm, the height is 34mm, and the foot width is 7.5mm.

In order to realize the connection between the present invention and devices such as small sensors or storage batteries on the vehicle, the present invention also includes a conductive slip ring 10, the structure of which is shown in FIG. 5 .

The conductive slip ring 10 includes: an inner ring 12 , an outer ring 13 , an inner ring terminal 14 and an outer ring terminal 15 .

The outer ring 13 is sleeved on the inner ring 12, the outer ring terminal 15 is connected to the outer ring 13, and the outer ring terminal 15 is also connected to various small sensors or batteries on the vehicle , the inner ring terminal 14 is connected to the inner ring 12, and the inner ring terminal 14 is also connected to the energy storage element 11; at the same time, the rotation center of the conductive slip ring 10 is connected to the vehicle tire 7 The axle center position of the wheel hub is the same.

The capacitor stores the electric energy, and further provides the electric energy to various small sensors on the vehicle through the conductive slip ring 10, or stores the electric energy in components such as batteries through the conductive slip ring for other purposes.

In traditional technology, most small sensors are powered by batteries. However, as the battery usage time increases, the effective voltage of the battery gradually decreases, resulting in a decrease in the sensitivity of the sensor and affecting the working state. When the energy collected by the present invention is used to supply power to various small sensors on the vehicle, the piezoelectric ceramic sheet is first deformed to generate electric energy, then the capacitor stores the electric energy, and the energy storage unit further outputs the electric energy, so that , the output voltage of the present invention is a stable voltage, and the effective voltage will not decrease with the increase of power supply time, which maintains the sensitivity of the sensor and ensures that the sensor can work normally.

In order to achieve the above purpose, improve the stability of the vehicle tire vibration energy harvesting device, reduce the requirement on the roughness of the road surface and expand the vehicle speed range in which rotational energy can be collected, the present invention also provides a vehicle.

The vehicle includes the above-mentioned vehicle tire vibration energy harvesting device, and the vehicle tire vibration energy harvesting device is installed on the wheel hub and spoke of the tire of the vehicle.

Compared with the prior art, the beneficial effect of the vehicle of the present invention is the same as that of the above-mentioned vehicle tire vibration energy harvesting device, which will not be repeated here.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, there will be changes in specific implementation methods and application ranges. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. The utility model provides a vehicle tire vibration energy harvesting device installs in vehicle tire's wheel hub spoke, its characterized in that, vehicle tire vibration energy harvesting device includes: the piezoelectric element comprises a first fixing unit, a second fixing unit, a cantilever beam, a piezoelectric element, a first magnet and a second magnet;

the first fixing unit is connected with the wheel hub spoke, the first fixing unit is fixedly connected with the tail part of the cantilever beam, and the head part of the cantilever beam is provided with the first magnet; the cantilever beam is provided with the piezoelectric element;

the second fixing unit is connected with the wheel hub spoke, the second fixing unit is connected with the second magnet, and the first magnet and the second magnet are correspondingly arranged to form a magnetic field; under the combined action of the magnetic field and the rotation of the wheel, the cantilever beam vibrates and deforms to enable the piezoelectric element to generate electric energy.

2. A vehicle tire vibration energy harvesting apparatus according to claim 1 and further comprising an energy storage unit mounted to a wheel hub spoke of the vehicle tire, the energy storage unit being connected to the piezoelectric element, the energy storage unit being configured to store electrical energy generated by the piezoelectric element.

3. A vehicle tire vibration energy harvester according to claim 2, wherein the energy storage unit is a capacitor, the capacitor being connected in parallel with the piezoelectric element.

4. A vehicle tire vibration energy harvesting apparatus according to claim 2 or 3 further comprising an electrically conductive slip ring, the slip ring comprising: the energy storage device comprises an inner ring, an outer ring, an inner ring wiring terminal and an outer ring wiring terminal, wherein the outer ring is sleeved on the inner ring, the outer ring wiring terminal is connected with the outer ring, the inner ring wiring terminal is connected with the inner ring, and the inner ring wiring terminal is further connected with the energy storage unit.

5. The vehicle tire vibration energy harvesting device of claim 4 wherein the center of rotation of the electrically conductive slip ring is located at the same axial center as the wheel hub of the vehicle tire.

6. The vehicle tire vibration energy harvesting device of claim 1 wherein a plurality of hub slots are defined in a hub spoke of the vehicle tire, and the first fixing unit or the second fixing unit is disposed in each hub slot.

7. A vehicle tire vibration energy harvester according to claim 1, wherein the first fixing unit and the second fixing unit are lifting lugs.

8. A vehicle tire vibration energy harvester according to claim 1 wherein the cantilever beam is elongate.

9. The vehicle tire vibration energy harvester of claim 1 wherein the piezoelectric element comprises two piezoceramic wafers, each of the two piezoceramic wafers being disposed on opposite sides of the cantilever beam.

10. A vehicle comprising the vehicle tire vibration energy harvesting device of any one of claims 1 to 9 mounted to a wheel hub spoke of a vehicle tire.

Images