A variable stiffness tire that adapts to road conditions

Abstract

The utility model discloses a variable stiffness tire of self -adaptation road surface condition belongs to the technical field of automobile tire, including tire body, electro -rheological fluid material layer, piezoelectric film subassembly and guide silk, tire body includes the tread rubber layer, crown band layer and air -tight layer who sets gradually from top to bottom, electro -rheological fluid material layer sets up inside tire body, piezoelectric film subassembly sets up below air -tight layer, and guide silk sets up in pairs, is used for connecting electro -rheological fluid material layer and piezoelectric film subassembly. The problem of the performance demand of different road conditions of the prior art due to the fixed stiffness of the conventional tire is solved. The utility model has improved the comfort and the controllability of the vehicle under the complex road conditions, and is suitable for the passenger car, the off -road vehicle and the special vehicle field, and has wide market prospect.

Description

Technical Field

[0001] This utility model relates to the field of automotive tire technology, specifically to a variable stiffness tire that adapts to road conditions. Background Technology

[0002] With rapid socio-economic development and the continuous improvement of people's living standards, the number of family cars has increased significantly, and private cars have become an important tool for modern families' daily travel. At the same time, people's travel range is constantly expanding, with a significant increase in demand for cross-regional self-driving tours and off-road adventures. As the only component of a vehicle in contact with the road surface, tires directly affect the vehicle's driving comfort, safety, and handling.

[0003] However, the requirements for tires vary under complex road conditions, such as city roads, mountain roads, and gravel roads. For example, tires with higher stiffness are needed on smooth roads to improve vehicle handling and stability, while tires with lower stiffness are needed on rough roads to improve ride comfort. Traditional tires, due to their fixed stiffness, struggle to meet the performance needs of different road conditions.

[0004] Therefore, how to provide a variable stiffness tire that adapts to road conditions and overcomes the shortcomings of existing technologies is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] Therefore, this utility model provides a variable stiffness tire that adapts to road conditions, in order to solve the problem in the prior art that it is difficult to meet the performance requirements of different road conditions due to the fixed stiffness of traditional tires.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a variable stiffness tire that adapts to road conditions, comprising:

[0008] The tire body includes, from top to bottom, a tread rubber layer, a crown belt layer, and an airtight layer;

[0009] An electrorheological fluid material layer is disposed inside the tire body;

[0010] A piezoelectric thin film assembly is disposed below the hermetic layer;

[0011] Guide wires, arranged in pairs, are used to connect the electrorheological fluid material layer and the piezoelectric thin film assembly.

[0012] Furthermore, the piezoelectric thin film assembly includes:

[0013] A piezoelectric film is disposed below the airtight layer and is tightly attached to the airtight layer, and two guide wires are connected between the piezoelectric film and the electrorheological fluid material layer.

[0014] A control unit is disposed inside the piezoelectric film, and the control unit is used to control the opening and closing of the piezoelectric film.

[0015] Furthermore, the electrorheological fluid material layer is disposed between the tread rubber layer and the crown belt layer.

[0016] Furthermore, the thickness of the electrorheological fluid material layer is 0.5-1 mm.

[0017] Furthermore, the width of the electrorheological fluid material layer is the same as the width of the tread rubber layer.

[0018] Furthermore, the guide wire is a silver-plated copper wire.

[0019] This utility model has the following advantages:

[0020] This invention, by incorporating an electrorheological fluid (EMF) material layer and a piezoelectric thin film assembly, allows the tire to adjust the state of the EMF layer according to different road conditions, thereby adjusting tire stiffness and ensuring real-time dynamic adjustment of vehicle performance. By placing the EMF layer between the tread rubber layer and the crown belt layer, it can quickly sense and respond to road impacts, ensuring that stiffness changes directly affect the tire's contact patch, improving the efficiency of handling or comfort adjustments. By making the width of the EMF layer the same as the width of the tread rubber layer, it ensures uniform distribution of external forces, resulting in more synchronized deformation during tire rolling or bending, and improving overall structural stability. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0023] Figure 1Cross-sectional view of a variable stiffness tire for adaptive road conditions provided by this utility model;

[0024] Figure 2 Provided by this utility model Figure 1 Enlarged view of the A-structure;

[0025] Figure 3 Provided by this utility model Figure 1 Enlarged view of the B-structure.

[0026] In the figure: 1 Tire body; 11 Tread rubber layer; 12 Crown belt layer; 13 Airtight layer; 2 Electrorheological fluid material layer; 3 Piezoelectric film assembly; 31 Piezoelectric film; 32 Control unit; 4 Guide wire. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] Please refer to Figures 1-3 The present invention discloses a variable stiffness tire that adapts to different road conditions. The present invention consists of four parts, as follows: Figure 1 As shown, the tire body includes a tire body 1, an electrorheological fluid material layer 2, a piezoelectric film assembly 3, and guide wires 4. The tire body 1 includes a tread rubber layer 11, a crown belt layer 12, and an airtight layer 13 arranged sequentially from top to bottom. The electrorheological fluid material layer 2 is disposed inside the tire body 1, the piezoelectric film assembly 3 is disposed below the airtight layer 13, and the guide wires 4 are arranged in pairs to connect the electrorheological fluid material layer 2 and the piezoelectric film assembly 3.

[0029] In this embodiment, the electrorheological fluid material layer 2 is in a liquid state under normal conditions. When energized, it can change from a liquid state to a semi-solid or solid state, and return to a liquid state after the power is removed, thereby achieving the effect of altering and enhancing tire stiffness. The electrorheological fluid material layer 2 is made of electrorheological fluid material, a type of smart material whose rheological properties can be rapidly and reversibly changed under the action of an applied electric field. When an electric field is applied, the fluid can change from a liquid state to a near-solid state, and return to a liquid state after the electric field is removed. It has a millisecond-level response speed and can return to its initial state after the electric field is removed.

[0030] The piezoelectric thin film assembly 3 can harvest mechanical energy and convert it into electrical energy to power the electrorheological fluid material layer 2. The piezoelectric thin film assembly 3 transmits current to the electrorheological fluid material layer 2 through guide wires 4, causing the layer to transform into a solid or semi-solid state, thereby improving the tire's handling performance. The two guide wires 4 are positioned as follows... Figure 1 , Figure 2 As shown, one is the positive electrode and the other is the negative electrode. By setting the electrorheological fluid material layer 2 and the piezoelectric thin film assembly 3, the tire can adjust the state of the electrorheological fluid material layer 2 according to different road conditions, thereby adjusting the tire stiffness and ensuring that the vehicle performance can be dynamically adjusted in real time.

[0031] Preferably, control can be provided for the piezoelectric thin film assembly 3 in various ways;

[0032] 1. Visual recognition solution: Real-time road condition information is collected by an external camera and sent to the vehicle computer, thereby controlling the opening and closing of the piezoelectric thin film assembly 3.

[0033] 2. Deformation data acquisition and analysis: A strain gauge is added inside the piezoelectric thin film assembly 3 to monitor tire deformation in real time; the tire deformation data is then used to control the opening and closing of the piezoelectric thin film assembly 3. Preferably, the strain gauge is a resistance strain gauge.

[0034] Preferably, the electrorheological fluid material layer 2 is disposed between the tread layer 11 and the crown belt layer 12. The tread layer 11 is in direct contact with the road surface and undergoes the most significant deformation under stress. With the electrorheological fluid material layer 2 positioned below it, it can quickly sense and respond to road impacts, ensuring that changes in stiffness directly affect the tire contact area, thereby improving the efficiency of handling or comfort adjustment.

[0035] Preferably, the thickness of the electrorheological fluid material layer 2 is 0.5-1 mm. The thickness of the electrorheological fluid material layer 2 directly affects the required electric field strength.

[0036] Electric field strength formula: E = V / d, where E: electric field strength; V: voltage; d: thickness;

[0037] Thinning the thickness can significantly increase the electric field strength under the same voltage; the output voltage of the piezoelectric thin film component 3 is usually 1-50V, which can be increased to 100V-500V through multi-layer stacking or series structure. With a thickness of 0.5-1mm, only 10-50V is needed to achieve the state switching of the electrorheological fluid material layer 2, without the need for an external high-voltage power supply.

[0038]

[0039] Preferably, the width of the electrorheological fluid material layer 2 is the same as the width of the tread rubber layer 11. By making the electrorheological fluid material layer 2 and the tread rubber layer 11 the same width, it is possible to ensure that the external force is evenly distributed, the deformation is more synchronized when the tire rolls or bends, and the overall structural stability is improved.

[0040] like Figure 3 As shown, the piezoelectric thin film assembly 3 includes a piezoelectric thin film 31 and a control unit 32. The piezoelectric thin film 31 is disposed below and tightly adhered to the airtight layer 13, and the control unit 32 has a sheet-like structure. Two guide wires 4 are connected between the piezoelectric thin film 31 and the electrorheological fluid material layer 2. The control unit 32 is disposed inside the piezoelectric thin film 31 and is used to control the opening and closing of the piezoelectric thin film 31.

[0041] In this embodiment, the control unit 32 intelligently controls the opening and closing of the piezoelectric film 31.

[0042] When on a flat urban road, the piezoelectric film 31 is activated, converting the tire's rolling deformation energy into electrical energy, activating the electrorheological fluid material layer 2 to solidify it, thereby increasing tire stiffness and enhancing handling.

[0043] When on rough / gravelly surfaces, the piezoelectric film 31 closes, and the electrorheological fluid material layer 2 returns to a liquid state, reducing tire stiffness and ensuring driving comfort.

[0044] Preferably, the guide wire is silver-plated copper wire. Compared with traditional copper or silver wire, silver-plated copper wire has higher conductivity and lower cost, and its resistance to bending fatigue is better than that of pure silver, making it suitable for the dynamic deformation environment of tires.

[0045] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A variable stiffness tire that adapts to road conditions, characterized in that, include: The tire body (1) includes a tread rubber layer (11), a crown belt layer (12) and an airtight layer (13) arranged sequentially from top to bottom; An electrorheological fluid material layer (2) is disposed inside the tire body (1); A piezoelectric thin film assembly (3) is disposed below the hermetic layer (13); Guide wires (4) are arranged in pairs for connecting the electrorheological fluid material layer (2) and the piezoelectric thin film assembly (3).

2. The variable stiffness tire adapting to road conditions as described in claim 1, characterized in that, The piezoelectric thin film assembly (3) includes: A piezoelectric film (31) is disposed below the airtight layer (13) and is tightly attached to the airtight layer (13). Two guide wires (4) are connected between the piezoelectric film (31) and the electrorheological fluid material layer (2). A control unit (32) is disposed inside the piezoelectric film (31) and is used to control the opening and closing of the piezoelectric film (31).

3. The variable stiffness tire adapting to road conditions as described in claim 1, characterized in that, The electrorheological fluid material layer (2) is disposed between the tread rubber layer (11) and the crown layer (12).

4. The variable stiffness tire adapting to road conditions as described in claim 3, characterized in that, The thickness of the electrorheological fluid material layer (2) is 0.5-1 mm.

5. The variable stiffness tire adapting to road conditions as described in claim 3, characterized in that, The width of the electrorheological fluid material layer (2) is the same as the width of the tread rubber layer (11).

6. The variable stiffness tire adapting to road conditions as described in claim 1, characterized in that, The guide wire (4) is a silver-plated copper wire.

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