Cycle Tyre Signal Generation Mounting
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Solution Overview
Problem
Existing two-wheeler tire systems for generating revolution-dependent signals, such as for speedometers and e-bike motors, face issues with magnet visibility, air resistance, twisting or loss of magnets, and magnetic property degradation due to integration into tire rubber, leading to unreliable operation and increased manufacturing complexity.
Innovation Solution
A signal-generating element is securely attached to the outside of the tire's reinforcing elements, forming part of the tire's outer surface or protruding from it, using a holding element like a bead or protective ring, and optionally an adapter, ensuring protection against weather and mechanical stress, with the option to replace or upgrade the magnet easily.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnet is attached to a spoke in the wheel, then the signal generation function is achieved, but the magnet becomes visually visible, increases air resistance, and can twist or be lost
Solution Approach 1:
The magnet is extracted from the traditional spoke location and repositioned to the tire surface, specifically on the tread or sidewall area. This extraction from the wheel assembly eliminates the harmful effects of air resistance and visual visibility while maintaining the signal generation function through proximity to the sensor on the fork or frame.
2Object-affected harmful factors
If the magnet is incorporated into the tire rubber, then visibility and air resistance are reduced, but the magnet requires strong magnetic properties that enlarge its size and may be pressed through the tire surface
Solution Approach 1:
A magnetic field mediator or flux concentrator is introduced between the magnet and the tire rubber. This intermediary element allows the use of smaller, weaker magnets by concentrating and directing the magnetic flux through the rubber to the sensor, eliminating the need for large magnets while maintaining sufficient signal strength.
3Stability of the object's composition
If permanent magnets are integrated into the tire during vulcanization, then the magnet is securely fixed, but the high temperature reduces the magnetic energy value
Solution Approach 1:
The magnet is pre-installed in a holder or mounting structure before the tire vulcanization process. This preliminary positioning allows the magnet to be secured without direct exposure to the high temperatures of vulcanization, preserving its magnetic energy while still achieving stable fixation through the holder structure that is attached to the tire.
4Reliability
If the magnet is placed on the valve, then the magnet is protected from weather, but the valve location is far from the sensor requiring longer cable runs
Solution Approach 1:
Instead of placing the magnet at the valve location (central dimension), the magnet is repositioned to the tire periphery on the tread or sidewall. This dimensional change in location brings the magnet much closer to the sensor mounted on the fork or frame, significantly reducing cable length while the tire rubber itself provides weather protection.
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 provides a reliable, weather-independent, and low-resistance signal generation system that is easy to manufacture and retrofit, reducing assembly time and costs, while maintaining the tire's structure and properties unchanged.
Implementation Method 1
a sensor in the form of a coil and a signal-generating element in the form of a magnet arranged in such a way that with each rotation of the wheel a voltage is induced in the coil
Data Source
Figure 1~2
Figure 3~4
Figure 5~6a
AI summary
Tyre, in particular cycle tyre, with a device for generating rotation-dependent signals, a method for producing said tyre and a system for controlling a cycle drive with such a tyre. Tyre, in particular cycle tyre, with a device for generating rotation-dependent signals, in which the device is arranged in the tyre (1, 3) or is connected to the tyre and has a signal-generating element (6, 14), which is held in a retaining element connected positively or non-positively to the tyre body, wherein the receiving element is arranged substantially on the outside of strengthening elements or reinforcing elements of the tyre and the signal-generating element is held in the retaining element in such a way that the signal-generating element forms part of the outer surface of the tyre or protrudes beyond the outer surface of the tyre.