Hybrid Tire Reinforcement Layer for Low Rolling Resistance
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Solution Overview
Problem
Existing reinforcement layers for elastomeric products, such as tire belt bandages, face challenges in balancing hysteresis behavior and shrinkage properties while maintaining a low weight, which affects rolling resistance and high-speed performance.
Innovation Solution
Incorporating cords made of end-twisted yarns with a weighted difference in fineness between high-modulus-normal-shrinkage polyethylene terephthalate (HMNS-PET) and polyamide 6.6 (PA 6.6), where the fineness of HMNS-PET is greater than PA 6.6 and the weighted difference is between 0 and 0.23, to achieve improved hysteresis and shrinkage properties without significantly increasing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If reinforcement layers use hybrid cords with HMNS-PET and PA 6.6 to improve hysteresis behavior, then rolling resistance is reduced, but the weight of the reinforcement layer increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the fineness of HMNS-PET yarn (300-700 dtex) and PA 6.6 yarn (200-400 dtex), and their weighted difference (0.05-0.20). This optimization allows achieving improved hysteresis behavior and reduced rolling resistance while minimizing weight increase through careful parameter selection
Solution Approach 2:
The patent uses composite materials by combining HMNS-PET and PA 6.6 yarns in a hybrid cord construction. The composite structure leverages the low hysteresis properties of HMNS-PET and the shrinkage properties of PA 6.6, achieving a balance between rolling resistance reduction and weight control
2Speed
If reinforcement layers use PA 6.6 yarn to achieve good shrinkage properties for high-speed performance, then high-speed suitability is improved, but hysteresis behavior deteriorates
Solution Approach 1:
The patent merges HMNS-PET yarn and PA 6.6 yarn in a hybrid cord construction, combining the low hysteresis properties of HMNS-PET with the shrinkage properties of PA 6.6. This merging allows the reinforcement layer to achieve both low rolling resistance and good high-speed performance
Solution Approach 2:
The patent optimizes the fineness parameters of both yarns and their weighted difference to achieve the desired balance. By controlling these parameters within specific ranges, the patent ensures adequate shrinkage behavior for high-speed performance while minimizing hysteresis losses
3Reliability
If reinforcement layers use higher fineness cords to maintain structural stability, then reliability is improved, but rolling resistance increases
Solution Approach 1:
The patent applies parameter changes by optimizing the fineness of individual yarns and their weighted difference. This allows achieving structural stability through proper parameter selection without requiring excessive fineness that would increase weight and rolling resistance
Solution Approach 2:
The hybrid cord construction combines materials with complementary properties, allowing structural stability to be achieved through the synergistic effect of HMNS-PET and PA 6.6 rather than relying solely on increased fineness
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 results in a reinforcement layer with reduced rolling resistance and maintained high-speed suitability, ensuring good stability and low weight, suitable for use in pneumatic vehicle tires and other elastomeric products.
Implementation Method 1
the two yarns being end-twisted with one another
Implementation Method 2
the hysteresis behavior and shrinkage properties while maintaining a low weight, which affects rolling resistance and high-speed performance
Implementation Method 3
PA 6.6 exhibits advantageous shrinkage properties for use as a material for the belt bandage's reinforcements, enabling the tire to perform well at high speeds
Data Source
Figure 1
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AI summary
The invention relates to a reinforcing layer (8, 10) for elastomeric products, in particular for a belt bandage, comprising cords as reinforcing elements, wherein each cord has exactly two yarns, the two yarns being twisted together at their ends, wherein the sum of the fineness of the two yarns is a maximum of 1030 dtex, and wherein one yarn of the two yarns is a yarn made of polyamide 6.6 (PA 6.6). The invention further relates to a vehicle tire comprising such a reinforcing layer. The objective is a reinforcing layer that, while maintaining sufficient shrinkage properties, exhibits improved hysteresis behavior with largely unchanged weight, and a tire that, while maintaining good high-speed characteristics, has lower rolling resistance.This is achieved by using another yarn of the two yarns being a yarn made of high-modulus-normal-shrinkage polyethylene terephthalate (HMNS-PET), by using the HMNS-PET yarn with a greater fineness than the PA 6.6 yarn, and by ensuring that the weighted difference in fineness of the two yarns is greater than 0 and at most 0.23.