Pneumatic Tire Reinforcement Sections for Stiffness Control
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Solution Overview
Problem
Existing pneumatic vehicle tires with high-modulus reinforcement bandages face challenges in maintaining optimal dynamic contour and pressure distribution, particularly at high speeds, due to uneven circumferential stiffness and tire growth issues.
Innovation Solution
The axial spacing of reinforcement sections is adjusted, with shorter sections in the central area and longer sections in the shoulder areas, using the same material and construction, to achieve variable circumferential stiffness and improved tire contour, utilizing steel or non-metallic high-modulus textile materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-modulus reinforcements are used in the bandage layer, then circumferential stiffness is improved and tire growth is prevented, but the tire cannot be properly elevated into the vulcanizing mold due to insufficient stretchability
Solution Approach 1:
The continuous reinforcement is divided into discrete reinforcement sections arranged in a staggered pattern. This segmentation allows the bandage layer to be stretched during mold elevation while maintaining high circumferential stiffness in the cured tire, as the gaps between sections permit elastic deformation without compromising structural integrity.
Solution Approach 2:
Different regions of the bandage layer have different reinforcement densities - the central region has higher reinforcement density for maximum stiffness, while the shoulder regions have lower density for flexibility during manufacturing. This local variation optimizes both manufacturing ease and operational performance.
2Strength
If continuous reinforcement is used in the bandage layer, then circumferential stiffness is maximized, but tire growth and dynamic contour control are insufficient
Solution Approach 1:
The reinforcement is segmented into discrete sections arranged in overlapping rows, creating a distributed stiffness pattern that controls tire growth more effectively than continuous reinforcement. The staggered arrangement prevents concentration of stress and provides more uniform dimensional stability.
Solution Approach 2:
The reinforcement sections are arranged asymmetrically in staggered rows rather than aligned patterns, creating more uniform stress distribution across the bandage layer. This asymmetric arrangement improves dimensional stability and prevents irregular tire growth during operation.
3Ease of manufacture
If reinforcement sections are arranged with larger axial spacing, then ease of manufacture is improved, but circumferential rigidity in shoulder areas is insufficient
Solution Approach 1:
The reinforcement sections are arranged with different axial spacing in different regions - tighter spacing in shoulder areas for maximum rigidity where needed for steering and stability, and larger spacing in the central region for flexibility and manufacturability. This local optimization satisfies both manufacturing and performance requirements.
Solution Approach 2:
The reinforcement arrangement utilizes two-dimensional spacing variation (both axial and circumferential dimensions) to optimize performance. By controlling spacing in multiple dimensions rather than uniform single-dimension spacing, the design achieves regional stiffness optimization while maintaining overall manufacturability.
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 configuration enhances performance in rolling resistance, aquaplaning, high-speed capabilities, and handling by maintaining even pressure distribution and reducing tire growth, allowing for higher speeds and improved abrasion resistance.
Implementation Method 1
the reinforcement sections slide on one another, since they are only connected to one another by raw rubber before the heating process
Implementation Method 2
After the tire's vulcanization process, the rubber matrix is firmly connected to the reinforcement sections, so that the properties of the reinforcement are used
Data Source
Figure 1
Figure 2~3
AI summary
Radial pneumatic tire for vehicles with a tread (1), a radial carcass (6), a belt assembly (8) with at least two belt plies (8a, 8b) and with at least one belt ply (9) which is arranged radially outside the belt assembly (8) and has reinforcing elements, wherein the reinforcing elements are extended longitudinally approximately in the circumferential direction of the tire and are arranged in interrupted reinforcing element sections (12), wherein these reinforcing element sections (12) are arranged in the belt ply (9) such that, viewed over the axial width of the belt ply (9), a lower circumferential stiffness per unit width is obtained in the central region (10) than in the two shoulder regions (11) adjacent to the central region (10).