Motorcycle Tyre Structure for High-Speed Radial Stability
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Solution Overview
Problem
Existing motorcycle tires, particularly bias-belted and bias-ply tires, face issues with high mass and poor radial dimension maintenance during inflation and high-speed driving, leading to thermal embrittlement and structural degradation.
Innovation Solution
A motorcycle tire design featuring a single carcass and crown reinforcement layer with specific angles and orientations, reducing the number of layers to minimize heating and maintain radial dimensions while achieving high speeds, and incorporating a single crown layer without wire reinforcement elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple carcass and crown reinforcement layers are used to maintain radial dimension and support high speed, then the tire's mass increases and thermal embrittlement occurs, but reducing layers compromises structural integrity
Solution Approach 1:
The patent removes the belt layer from the traditional bias-ply tire structure, extracting only the essential carcass and crown reinforcement layers needed for radial dimension maintenance. This simplification reduces mass and thermal embrittlement while preserving the core functionality of maintaining radial stability at high speeds through optimized wire reinforcement element arrangements in the remaining layers.
2Stability of the object's composition
If traditional bias-ply tire structure with multiple layers is used, then radial dimension is maintained, but thermal embrittlement and structural degradation occur at high speeds
Solution Approach 1:
The belt layer is extracted from the tire structure to reduce the number of layers that generate heat through deformation and friction. This removal decreases thermal embrittlement while the remaining carcass and crown layers are optimized with specific wire reinforcement element angles and arrangements to maintain radial dimension stability during high-speed operation.
Solution Approach 2:
The patent optimizes the angular parameters of wire reinforcement elements in the carcass and crown layers, positioning them at specific angles to maximize radial stability while minimizing heat generation. The parameter optimization of layer composition and wire angles reduces thermal embrittlement without compromising the tire's ability to maintain radial dimensions under thermal stress.
3Ease of manufacture
If diagonal tire structure is used for low cost and simple manufacturing, then mass is reduced, but radial dimension maintenance capability is poor
Solution Approach 1:
The patent transitions from a diagonal tire structure to a bias-ply structure with optimized wire reinforcement element angles in the carcass and crown layers. This parameter change in the fundamental tire architecture improves radial dimension maintenance capability while keeping the manufacturing process relatively simple by using only one carcass layer and one crown layer, avoiding the complexity of multiple belts.
4Reliability
If bias-belted tire structure is used to improve radial dimension maintenance, then mass increases compared to diagonal tires, but thermal embrittlement occurs at high speeds
Solution Approach 1:
The belt layer is extracted from the bias-belted tire structure, reducing the total number of layers from three (carcass, belt, crown) to two (carcass, crown). This extraction reduces mass and thermal embrittlement while the optimized wire reinforcement element arrangements in the remaining layers preserve the radial dimension maintenance capability that characterized bias-belted tires.
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
The tire achieves reduced mass, improved radial dimension maintenance, and enhanced comfort by minimizing heating-induced thermal embrittlement, while maintaining the same top speed as prior art tires and reducing mechanical stress.
Implementation Method 1
during high-speed driving which also radially deforms the tire due to centrifugal force
Implementation Method 2
minimize heating and maintain radial dimensions while achieving high speeds, and incorporating a single crown layer without wire reinforcement elements
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
The tyre for a motorcycle has a speed rating less than or equal to V and comprises a single crown layer (18) and a single carcass layer (34). The filamentary crown reinforcing elements form, with the circumferential direction (Z) of the tyre (10), an angle AT and the filamentary carcass reinforcing elements form, with the circumferential direction (Z) of the tyre (10), an angle ACS, in a portion (34S) of the carcass layer (34) extending axially in radial line with the crown layer (18). The angle AT and the angle ACS have opposite orientations such that ||AT|-|ACS|| ≤ 5°.