Tire Sidewall Raised Mark Structure for Visibility and Life
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Solution Overview
Problem
Existing tires, especially those for commercial vehicles under heavy loads, face challenges in maintaining mark visibility while improving life performance.
Innovation Solution
A tire design featuring a raised portion on the sidewall that extends continuously in a tire circumferential direction, includes a tire maximum width position, and has a mark portion with recessed characters, which maintains visibility and reduces heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a base portion protruding at constant height is provided on the sidewall, then mark visibility is improved, but life performance deteriorates due to increased stress concentration and heat generation
Solution Approach 1:
The patent applies local quality by varying the protrusion height of the raised portion along the tire circumferential direction. The mark portion has a greater protrusion height than other portions, creating localized enhancement for mark visibility while maintaining smaller protrusions elsewhere to reduce overall stress concentration and heat generation. This resolves the contradiction by concentrating the visibility-enhancing feature only where needed rather than uniformly across the entire sidewall.
2Strength
If the raised portion extends continuously in annular shape, then structural strength is improved, but heat generation increases
Solution Approach 1:
The patent implements local quality by creating a raised portion with non-uniform protrusion height around the tire circumference. The mark portion has increased protrusion height for visibility, while other portions have reduced protrusion height to minimize heat-generating contact area. This maintains necessary structural strength where needed while reducing overall heat generation compared to a continuously high annular raised portion.
Solution Approach 2:
The patent applies partial action by providing the raised portion with selective protrusion heights rather than uniform elevation throughout. The mark portion receives enhanced protrusion for its specific function of visibility, while other areas have minimal protrusion sufficient for structural support but insufficient to generate excessive heat. This partial differentiation resolves the contradiction between strength and heat generation.
Data Source
AI summary
A tire has a pair of sidewall portions. At least one of the sidewall portions has a reference surface and a raised portion raised outward in a tire axial direction. The raised portion extends continuously in a tire circumferential direction in an annular shape. The raised portion includes a tire maximum width position. The raised portion is provided with a mark portion including a plurality of characters recessed axially inward.