Resin Tire Reinforcing Layer for Weight and Strength
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Solution Overview
Problem
Tires face a trade-off between weight reduction and maintaining pressure-withstanding performance and impact durability, as thinning the tire walls for weight reduction compromises these aspects.
Innovation Solution
Incorporating a reinforcing layer with cords covered by resin or rubber, extending from the bead portion to the side portion and covering the inner peripheral surface, which helps to bear tensile forces and improve durability, even with thinned walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the tire frame member walls are thinned for weight reduction, then weight is reduced, but pressure-withstanding performance and impact durability deteriorate
Solution Approach 1:
The patent employs a composite structure combining a resin tire frame member with a reinforcing layer containing cords covered by resin or rubber. This composite material approach allows the thin-walled resin structure to gain enhanced strength and pressure-withstanding performance from the reinforcing layer, resolving the contradiction between weight reduction and structural strength
Solution Approach 2:
The reinforcing layer is strategically positioned to cover the inner peripheral surface of the side portion and extend from the bead portion to the side portion. This localized reinforcement applies material properties selectively where tensile forces occur during tire operation, providing strength enhancement precisely where needed without adding unnecessary weight throughout the entire tire structure
2Weight of moving object
If the tire frame member walls are thinned for weight reduction, then weight is reduced, but impact durability deteriorates
Solution Approach 1:
The composite structure of resin frame member plus reinforcing layer provides improved impact durability while maintaining weight reduction benefits. The cord-based reinforcing layer absorbs and distributes impact forces, preventing the thin walls from failing under impact conditions
Solution Approach 2:
By placing the reinforcing layer at the inner peripheral surface of the side portion where impact forces are transmitted during running-on events, the structure provides localized protection against impact damage while keeping the overall tire weight low
Data Source
AI summary
A tire whose pressure-proofing performance and impact durability can be improved, is provided. The tire includes: a tire frame member which is made of resin and includes: a bead portion covering a bead core; a side portion extending outwardly in a tire radial direction from the bead portion; and a crown portion extending inwardly in a tire width direction from the side portion, and the tire also includes a reinforcing layer which includes plural cords covered by resin or rubber and which extends from the bead portion to the side portion of the tire frame member to cover at least an inner peripheral surface of the side portion.