Pneumatic Tire Sidewall Marking Structure for Smooth Contours
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Solution Overview
Problem
Conventional pneumatic tires with recessed marks on sidewalls suffer from a deteriorated appearance due to irregular contours and increased design and processing costs, especially when micro projections are arranged at varying intervals along curved lines.
Innovation Solution
A pneumatic tire design featuring a marking portion with a smooth first region, a projection-recess second region, and a rib fringing portion that demarcates the contour, enhancing contrast and appearance while avoiding irregular wavy lines and reducing design complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If micro projections are arranged at varying intervals along curved lines to form marks, then the mark can be formed on the sidewall, but the contour becomes irregular and wavy, deteriorating the appearance
Solution Approach 1:
The marking portion is segmented into three distinct regions: a first region forming the mark, a second region as background with micro projections, and a fringing portion as a rib. This segmentation allows the contour to be defined by the fringing portion rather than by irregularly spaced micro projections, achieving smooth appearance while maintaining manufacturing feasibility
Solution Approach 2:
The fringing portion acts as an intermediary element that demarcates the first region from the second region. This rib structure serves as a mediator that creates a clear, smooth contour boundary between the mark and background, eliminating the need for micro projections to define the contour directly
2Illumination intensity
If micro projections are used to form the background region, then contrast and visibility of the mark are improved, but the contour becomes irregular due to the arrangement of micro projections
Solution Approach 1:
Different regions are assigned different qualities: the second region has micro projections for high contrast and visibility, while the fringing portion provides a smooth, regular contour. This local differentiation allows each region to fulfill its specific function without compromising the overall appearance
Solution Approach 2:
The marking portion is divided into functional segments where micro projections are confined to the second region (background) and do not extend into the fringing portion. This segmentation isolates the visibility-enhancing micro projections from the contour-defining fringing portion, allowing both requirements to be satisfied simultaneously
3Shape
If a fringing portion is added as a rib to demarcate the mark contour, then appearance and contour smoothness are improved, but the structure becomes more complex
Solution Approach 1:
The fringing portion is merged with the marking portion as an integrated structural element rather than a separate component. This rib structure is formed as part of the same molding process, combining the contour-defining function with the existing marking portion structure, thereby reducing overall complexity despite adding functional elements
Data Source
AI summary
A pneumatic tire can include a pair of sidewall portions, where an outer surface of the sidewall portion can include a marking portion. The marking portion can include a first region forming a mark, a second region that is a background portion of the mark, and a fringing portion that demarcates the first region from the second region and fringes the contour of the mark. The first region can be formed as a smooth surface. The second region can be a projection-recess region where a plurality of micro projections are arranged. The fringing portion can be a rib projecting from the first region.