Pneumatic Tire Sidewall Mark Segmentation for Crack Prevention
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Solution Overview
Problem
Existing pneumatic tire designs face challenges in increasing the visibility of distinguishing marks on the sidewall while preventing defects such as 'bare' and cracks, especially when the protruding portions are formed high.
Innovation Solution
A pneumatic tire design featuring a first protruding portion along the mark's profile and a second protruding portion at a lower height adjacent to the outer side, forming a step-shaped recessed portion to enhance rubber flow and stress dispersion, along with serrations and projective methods to improve visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the protruding portion is formed high to increase the visibility of the mark, then the visibility is improved, but rubber supply becomes short causing bare defects or stress concentration causing cracks
Solution Approach 1:
The protruding portion is divided into two segments: a first protruding portion that protrudes along the profile of the mark, and a second protruding portion that protrudes at a lower height adjacent to the outer side of the first protruding portion. This segmentation allows the mark to maintain high visibility through the first portion while the second portion provides structural support and stress dispersion to prevent cracks and bare defects.
Solution Approach 2:
Different regions of the protruding portion are given different heights and functions. The first protruding portion (inner region) is made higher to maximize visibility, while the second protruding portion (outer region) is made lower to provide structural reinforcement. This local differentiation optimizes both visibility and structural integrity simultaneously.
2Shape
If the protruding portion is formed high to emphasize the profile of the mark, then the profile emphasis is improved, but stress concentration at the root causes crack generation
Solution Approach 1:
The protruding portion is segmented into a first protruding portion for profile emphasis and a second protruding portion for structural support. The second portion acts as a transition zone that reduces stress concentration at the root while maintaining the emphasized profile of the mark through the first portion.
Solution Approach 2:
The root region is reinforced by the second protruding portion which provides additional material and structural support exactly where stress concentration occurs. This local quality enhancement at the root prevents cracks while allowing the upper portions to maintain strong profile emphasis.
Data Source
AI summary
A pneumatic tire has a distinguishing mark is formed on a surface of a side wall portion. The pneumatic tire comprises a first protruding portion protruding along a profile of the mark and a second protruding portion protruding at a height which is lower than the first protruding portion, adjacent to an outer side of the first protruding portion.