Adjustable Pneumatic Tyre with Spokewise Force Devices
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Solution Overview
Problem
Conventional pneumatic tires lack adjustable properties to effectively manage vibrations and rolling resistance across various road and off-road conditions, leading to inefficient damping and rigidity issues.
Innovation Solution
Incorporating controlled force devices or absorbers between the wheel rim and tire tread/side-walls, arranged in a spokewise configuration with spherical joints, which can include magnetorheological fluids or electrical control, to adjust force transmission and absorption characteristics dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a traditional pneumatic tyre with overpressure is used, then the tyre structure is simple and easy to manufacture, but the damping is very low and rigidity cannot be directed to different desirable directions
Solution Approach 1:
The tyre is segmented into multiple independent chambers instead of a single toroidal chamber. Each chamber can be independently controlled with its own pressure and damping characteristics, allowing different regions of the tyre to have different rigidity and damping properties tailored to specific driving conditions and directional requirements.
Solution Approach 2:
The tyre incorporates dynamically adjustable pressure control systems that can modify the pressure in each chamber in real-time based on driving conditions. This allows the tyre to transition between different rigidity states and damping characteristics, enabling active adaptation to varying road conditions, vehicle loads, and driving maneuvers.
2Ease of manufacture
If a traditional pneumatic tyre with overpressure is used, then the tyre structure is simple, but the rigidity cannot be directed to different desirable directions
Solution Approach 1:
Different chambers or regions of the tyre are assigned different pressure levels and rigidity characteristics based on their specific functional requirements. For example, the lateral chambers may be pressurized to provide rigidity for cornering stability, while the longitudinal chambers may have different pressure settings for acceleration and braking performance, allowing directional rigidity control.
Solution Approach 2:
The multi-chamber tyre structure serves multiple functions simultaneously: it provides both structural support and active damping, enables directional rigidity control, and can adapt to various driving conditions. The same chamber system that provides basic tyre function also enables advanced suspension-like characteristics and active ride quality management.
3Strength
If tyre pressure is increased to improve rigidity, then the tyre becomes more rigid for better handling, but the damping capability decreases and rolling resistance increases
Solution Approach 1:
The segmentation into multiple chambers allows the tyre to achieve rigidity in specific directions or regions without uniformly increasing pressure throughout the entire tyre. By selectively pressurizing only the chambers that need to provide structural support for handling, the tyre maintains necessary rigidity while keeping other chambers at lower pressures to minimize energy loss and rolling resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances tire dynamics with adjustable properties, reducing rolling resistance and improving vehicle chassis control across diverse conditions by synchronizing absorption frequencies with vehicle kinematics, thereby enhancing vehicle stability and handling.
Implementation Method 1
a controlled force device/force devices of a type of a controlled absorber or a controlled force actuator for a change of force transmission between the rim and the tyre
Implementation Method 2
which can include magnetorheological fluids or electrical control
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention concerns the pneumatic tyre with adjustable inner whole-space properties, especially for motor vehicles, consisting of a wheel rim and a tyre comprising a tyre tread and side-walls, wherein inside the tyre between the rim (4) and the tread (2) and/or the side-walls (3) of the tyre (I) there is/there are force device/s for force transmission change between the rim and the tyre, comprising a coherent annular force device or individual force devices (51 - 56) separated one from another and arranged in a spokewise way around the entire tyre (1) circumference.