Tire Sidewall Ridge Arrangement for Precise Decorative Areas
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Solution Overview
Problem
The existing tire designs face challenges in precisely forming dense and sparse areas on the outer surface of the side wall due to the intersecting orientation of second ridge parts, making it difficult to achieve high precision in groove formation and decorative patterns.
Innovation Solution
The tire features first and second ridge parts on the outer surface of the side wall, both extending in the tire radial direction, with specific positioning to create alternating dense and sparse areas, allowing for precise formation of decorative patterns and easy groove creation in the vulcanizing mold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the second ridge part extends in a direction intersecting the first ridge part, then a decorative effect can be achieved, but it becomes difficult to form grooves with high precision and create dense areas with accurate positioning
Solution Approach 1:
The patent inverts the conventional approach by making both the first ridge part and the second ridge part extend in the tire radial direction, rather than having the second ridge part intersect the first. This inversion simplifies the groove formation process while still achieving the decorative effect through alternating dense and sparse area arrangements.
Solution Approach 2:
The decorative area is segmented into dense areas where both first and second ridge parts are present, and sparse areas where only one type of ridge part is present. This segmentation allows for precise control of the decorative pattern while maintaining simple radial extension for both ridge parts.
2Shape
If the second ridge part extends in an intersecting direction, then decorative complexity is increased, but the relative position precision between first and second ridge parts deteriorates
Solution Approach 1:
Instead of using intersecting directions to create decorative complexity, the patent inverts the approach by using parallel radial extension for both ridge parts and achieving complexity through the alternating arrangement of dense and sparse areas in the tire circumferential direction.
Solution Approach 2:
The patent moves the decorative complexity from the directional orientation of ridge parts to the circumferential arrangement pattern. By alternating dense and sparse areas in the circumferential direction while keeping both ridge parts radially oriented, the design achieves complexity without compromising positioning precision.
3Manufacturing precision
If both first and second ridge parts extend in the tire radial direction with specific positioning, then manufacturing precision is improved, but the structural complexity increases
Solution Approach 1:
The ridge part configuration is segmented into two distinct types (first and second ridge parts) with different circumferential positions, both extending radially. This segmentation enables precise formation of dense and sparse areas while maintaining simple radial geometry for each individual ridge part.
Solution Approach 2:
Different local qualities are assigned to different circumferential positions: first ridge parts are positioned at specific circumferential locations and second ridge parts at alternating locations. This local differentiation creates the dense and sparse area pattern while keeping the radial extension simple and manufacturable.
Data Source
AI summary
In a tire, first and second ridge parts extending in a tire radial direction each have a central portion in the tire radial direction located on an inner side in the tire radial direction with respect to a central portion of the first ridge part in the tire radial direction are provided on an outer surface of a side wall part. A decorative area provided in an outer surface of the side wall part includes a dense area in which the first ridge part and the second ridge part face each other in the tire circumferential direction, and a sparse area in which either the first ridge parts or the second ridge parts face each other in the tire circumferential direction without interposing the other therebetween.