Tire Belt Design for Weight Reduction and Diameter Growth Control
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Solution Overview
Problem
Existing tire technologies fail to adequately reduce tire weight while maintaining durability and preventing diameter growth, especially when the amount of steel in the belt layers is decreased.
Innovation Solution
A tire design featuring two or more crossing belt layers with steel cords tilted at 10° to 30° and a high-angle belt layer with steel cords tilted at 5° or more, where the high-angle belt layer has reduced steel mass but enhanced compressive rigidity, preventing crossing belt layer shrinkage and diameter growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the amount of steel in the high-angle belt layer is reduced to decrease tire weight, then tire weight is reduced, but diameter growth suppression capability deteriorates
Solution Approach 1:
The invention changes the parameter of compressive rigidity in the high-angle belt layer, requiring it to be greater than the compressive rigidity in the crossing belt layers. This parameter change allows the high-angle belt layer to maintain sufficient diameter growth suppression capability even with reduced steel amount, thus resolving the contradiction between weight reduction and reliability maintenance
Solution Approach 2:
The invention applies different quality requirements to different belt layers: the high-angle belt layer is designed with high compressive rigidity to suppress diameter growth, while the crossing belt layers focus on circumferential strength. This local differentiation of properties allows optimized steel distribution that reduces overall weight while maintaining necessary performance
2Weight of moving object
If the amount of steel in the belt layers is decreased to reduce tire weight, then tire weight is reduced, but tire durability deteriorates
Solution Approach 1:
The invention changes the compressive rigidity parameter of the high-angle belt layer to be greater than that of the crossing belt layers. This parameter optimization ensures that with reduced steel content, the tire maintains sufficient structural integrity and durability through enhanced rigidity in the critical high-angle belt layer that prevents crossing belt layer shrinkage
3Reliability
If a conventional layered belt structure with crossing belt layers and high-angle belt layer is used to enhance circumferential rigidity, then diameter growth is suppressed, but tire weight increases
Solution Approach 1:
The invention optimizes the compressive rigidity parameter of the high-angle belt layer, setting it greater than the compressive rigidity of the crossing belt layers. This parameter change enables effective diameter growth suppression with reduced steel content in the high-angle belt layer, thereby reducing overall tire weight while maintaining the diameter growth suppression function
Solution Approach 2:
The invention applies partial steel reduction strategy, specifically reducing steel amount in the high-angle belt layer while maintaining or optimizing its compressive rigidity. This partial action approach reduces overall steel content and tire weight while the enhanced compressive rigidity ensures the high-angle belt layer continues to effectively suppress diameter growth
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 design effectively reduces tire weight while maintaining durability and preventing diameter growth, ensuring high tire rigidity and durability even with reduced steel usage.
Implementation Method 1
The tire circumferential rigidity is enhanced by a high-angle belt layer which prevents crossing belt layers from shrinking in a tire width direction (Poisson deformation)
Data Source
Figure 1
Figure 2A~2D
Figure 2E~2H
AI summary
Provided is a tire such that both tire weight reduction and high durability can be achieved by establishing a technology capable of ensuring the sufficient effect of preventing diameter growth even when the amount of steel used in a belt layer is decreased. The tire includes: two or more crossing belt layers 4 including rubberized layers of steel cords tilting and extending at an angle of 10° to 30° with respect to a tire equatorial plane, the rubberized layers being arranged such that the directions of the cords intersect each other; and a high-angle belt layer 3 including a rubberized layer of steel cords tilting and extending at an angle which is 5° or more greater than the angle of the crossing belt layers. The mass of the steel cords per unit area included in the high-angle belt layer is 85% or less of the mass of the steel cords per unit area included in the crossing belt layers, and compressive rigidity per unit area in a cross section orthogonal to the longitudinal direction of the steel cords of the high-angle belt layer is greater than compressive rigidity per unit area in a cross section orthogonal to the longitudinal direction of the steel cords of the crossing belt layers.