Metallic Tire Reinforcing Cord for Elastomer Penetration and Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional metallic reinforcing cords for vehicle wheels face issues with corrosion, adhesion to elastomeric material, and structural integrity due to inadequate penetration of elastomeric material between metallic wires, leading to cutting forces and compromised performance.
Innovation Solution
The metallic reinforcing cord features metallic wires spaced apart by a minimum distance greater than or equal to twice their diameter, often with a helical geometry, enhancing elastomeric material penetration and distribution, thereby improving adhesion and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic wires are placed close together in conventional reinforcing cords, then the cord structure is compact and easier to manufacture, but elastomeric material cannot penetrate adequately between wires, leading to poor adhesion and cutting forces
Solution Approach 1:
The reinforcing cord is segmented into multiple layers with different wire spacing characteristics. The first layer has tightly spaced wires for structural integrity, while the second layer has widely spaced wires (minimum distance ≥ 2 times wire diameter) to enable elastomeric material penetration and adhesion.
Solution Approach 2:
Different regions of the reinforcing cord have different wire spacing properties tailored to their specific functions. The first layer provides compactness and strength, while the second layer provides penetration capability and adhesion, creating local quality variations throughout the cord structure.
2Reliability
If metallic wires are spaced far apart to allow elastomeric penetration, then adhesion improves, but the cord requires more complex multi-layer construction
Solution Approach 1:
Two reinforcing cord layers with different wire spacing characteristics are merged into a single composite structure. The first layer with tight spacing provides structural integrity, while the second layer with wide spacing enables elastomeric penetration, combining the benefits of both configurations.
Solution Approach 2:
The reinforcing cord uses a composite structure combining metallic wires arranged in two distinct layers with different spacing patterns, creating a multi-functional material that simultaneously achieves structural integrity and adhesion performance.
3Ease of manufacture
If metallic wires are tightly packed for compact cord structure, then manufacturing is simpler, but cutting forces increase and compromise performance
Solution Approach 1:
The cord structure is segmented into two layers where the second layer's widely spaced wires reduce cutting forces by allowing elastomeric material to act as a cushioning medium between the metallic wires and the surrounding structure.
Solution Approach 2:
The second layer of widely spaced wires is positioned beforehand to create spacing that allows elastomeric material penetration, which then acts as a cushioning layer that reduces cutting forces before they reach the metallic wires.
Data Source
AI summary
The invention relates to a metallic reinforcing cord (10) for tyres for vehicle wheels, comprising from two to ten metallic wires (11) twisted together with a twisting pitch (P) and each having a predetermined diameter. In at least some cross sections of the metallic reinforcing cord (10), at least two of said metallic wires (11) are arranged to a minimum mutual distance greater than, or equal to, 2.5 times the predetermined diameter.