Radial Tire Patch Rubber Asymmetric Reinforcement
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Solution Overview
Problem
Conventional methods for repairing radial tires, particularly supersized tires, face issues with the durability of patch rubber attachments and prolonged repair times due to alignment of patch cords and excessive reinforcement, leading to early damage and inefficiency.
Innovation Solution
A method involving the attachment of patch rubber with reinforcing elements arranged in a trapezoidal shape, where inner edges are positioned at varying distances from the tire circumferential line, reducing the likelihood of crack propagation and requiring less extensive reinforcement, thereby enhancing durability and shortening repair time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If patch rubber is attached with adhesive from the inner side of the tire to the damaged portion of the carcass ply, then the damaged portion is reinforced, but the durability of the patch rubber attachment deteriorates due to alignment of patch cords in a straight line
Solution Approach 1:
The patent applies asymmetry by positioning the inner edges of patch cords at varying distances from the tire circumferential line rather than aligning them in a straight line. Specifically, the inner edges are arranged asymmetrically with different offsets (e.g., 0-10mm, 10-20mm, or 20-30mm from the circumferential line), creating an irregular pattern that prevents crack propagation while maintaining reinforcement effectiveness.
Solution Approach 2:
The patent implements local quality by varying the position of patch cord edges at different locations within the patch rubber. The inner edges are strategically positioned at different distances from the circumferential line to create localized variations in reinforcement density and crack resistance, optimizing both strength and durability in different regions of the repaired area.
2Strength
If patch rubber with straight-aligned patch cords is used, then the reinforcement effect is achieved, but crack propagation occurs more easily between closely spaced edges
Solution Approach 1:
The patent uses asymmetry to break the continuity of potential crack paths by positioning patch cord inner edges at different offsets from the circumferential line. This asymmetric arrangement creates irregular spacing between edges, preventing cracks from propagating smoothly from one edge to another, thereby resisting crack propagation while preserving the reinforcement effect.
Solution Approach 2:
The patent applies preliminary action by pre-positioning the patch cords with asymmetric offsets during the repair process, before the tire undergoes normal operation and stress cycling. This preliminary asymmetric arrangement is built into the repair structure itself, proactively preventing crack propagation rather than reacting to it after it occurs.
3Reliability
If excessive reinforcement is applied to ensure durability, then the service life is extended, but the repair time increases
Solution Approach 1:
The patent applies local quality by concentrating reinforcement where it is most needed - at the inner edges of patch cords - rather than uniformly across the entire patch rubber. By positioning edges at specific asymmetric offsets (0-10mm, 10-20mm, or 20-30mm from the circumferential line), the reinforcement is optimized locally to prevent crack propagation without requiring excessive overall reinforcement, thus extending service life while controlling repair time.
Data Source
AI summary
Provided is a method for repairing a radial tire that enhances the durability of patch rubber attached to a damaged portion of a carcass ply from the inner side of the tire and that extends the service life of the repaired tire while reducing the repair time.The method according to the present invention for repairing a radial tire (1) includes a step of attaching a patch rubber (10), in which a plurality of reinforcing elements (11) are arranged in parallel and covered with rubber, from the inner side of the tire to a damaged portion (7) of a carcass ply (5a) when at least one ply cord (6a) in the carcass ply is broken along with ply rubber at a sidewall portion (3). The patch rubber is attached so that the reinforcing elements (11) are parallel to a tire radial direction and so that inner edges (11a, 11b, 11c) of the reinforcing elements (11) in the tire radial direction are positioned to at least partially have different mutually distances in a perpendicular direction from a tire circumferential line.