Pneumatic Tire Sidewall Serration for Blurring and Stiffness
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Solution Overview
Problem
Existing serration designs on pneumatic tire sidewalls fail to effectively blur irregularities resulting from member boundaries, leading to inadequate stiffness, mud and water drainage, and heat dissipation performance.
Innovation Solution
A serration portion with multiple basic ridges and shorter sub-ridges that cross the basic ridges, provided without coupling neighboring basic ridges, enhancing blurring effects, stiffness, and reducing heat retention and drainage issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple basic ridges are provided side by side to form a serration portion, then the blurring effect on irregularities is improved, but the stiffness of the sidewall portion deteriorates
Solution Approach 1:
The serration portion is segmented into two types of ridges: basic ridges extending in the tire radial direction and sub-ridges extending in a direction crossing the basic ridges. This segmentation allows each ridge type to fulfill specific functions - basic ridges provide blurring effect while sub-ridges provide stiffness, resolving the contradiction between blurring effect and stiffness.
Solution Approach 2:
Different regions of the serration portion are assigned different ridge configurations. The basic ridges are distributed to provide blurring effect across the surface, while sub-ridges are strategically positioned to enhance stiffness without compromising the overall blurring effect. This local differentiation optimizes both blurring and stiffness properties.
2Manufacturing precision
If sub-ridges are provided to enhance blurring effect and stiffness, then the blurring effect and stiffness are improved, but mud draining performance deteriorates
Solution Approach 1:
The sub-ridges are designed to be shorter than the basic ridges and are provided without coupling neighboring basic ridges. This partial action approach provides enough stiffness enhancement while maintaining sufficient spacing between ridges to allow mud and water to drain through, preventing complete blockage of drainage paths.
3Manufacturing precision
If sub-ridges are provided to enhance blurring effect and stiffness, then the blurring effect and stiffness are improved, but water draining performance deteriorates
Solution Approach 1:
The sub-ridges are designed with limited length and strategic positioning that provides stiffness enhancement while maintaining drainage pathways. The spacing and length control ensures water can flow through the serration portion without being completely blocked, balancing stiffness enhancement with water drainage capability.
4Manufacturing precision
If sub-ridges are provided to enhance blurring effect and stiffness, then the blurring effect and stiffness are improved, but heat dissipation performance deteriorates
Solution Approach 1:
The sub-ridges are designed to be shorter and not couple neighboring basic ridges, creating gaps and channels that allow heat to dissipate from the sidewall surface. This partial configuration provides stiffness enhancement while maintaining thermal pathways for heat dissipation, preventing excessive heat accumulation.
Data Source
AI summary
A pneumatic tire exerts an excellent blurring effect on irregularities resulting from a boundary between members in a sidewall portion. A pneumatic tire includes a serration portion formed by providing multiple basic ridges side by side at intervals in a tire circumferential direction on a surface of a sidewall portion, and multiple sub-ridges extending in a direction crossing the basic ridges and shorter than the basic ridges, which are provided without coupling the basic ridges neighboring each other.