Tire Sidewall Ridge Structure for Precise Dense-Sparse Patterns
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Solution Overview
Problem
Existing tires face challenges in precisely forming dense and sparse areas on the sidewall due to the intersecting design of ridge parts, making it difficult to achieve high precision in mold grooving and decorative patterns.
Innovation Solution
The tire design features first and second ridge parts that extend radially, with alternating pitch intervals and specific positional relationships, allowing for precise formation of dense and sparse areas on the sidewall, facilitated by recessed portions that can form characters or symbols.
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 is achieved through dense and sparse areas, but it becomes difficult to provide grooves for forming the ridge parts on the mold inner surface with high precision
Solution Approach 1:
The decorative pattern is segmented into two distinct types of ridge parts: first ridge parts that extend in the tire radial direction, and second ridge parts that extend in the tire circumferential direction. This segmentation allows each ridge type to be formed by separate, simpler grooves on the mold, improving manufacturing precision while maintaining the overall decorative effect of dense and sparse areas
Solution Approach 2:
Instead of having the second ridge part intersect the first ridge part at arbitrary angles to create the decorative pattern, the invention inverts the approach by making the second ridge part extend parallel to the tire circumferential direction. This inversion simplifies the groove geometry on the mold from complex intersecting grooves to simpler parallel grooves, thereby improving manufacturing precision
2Shape
If the second ridge part extends in a direction intersecting the first ridge part, then a decorative effect is achieved, but it becomes difficult to form the dense area on the outer surface of the side wall part with high precision
Solution Approach 1:
The decorative pattern is segmented into two distinct types of ridge parts: first ridge parts that extend in the tire radial direction, and second ridge parts that extend in the tire circumferential direction. This segmentation allows each ridge type to be formed by separate, simpler grooves on the mold, improving manufacturing precision while maintaining the overall decorative effect of dense and sparse areas
Solution Approach 2:
The invention changes the directional parameter of the second ridge part from an intersecting angle to parallel alignment with the tire circumferential direction. This parameter change simplifies the groove geometry on the mold from complex intersecting grooves to simpler parallel grooves, thereby improving the precision of forming both the dense and sparse areas
Data Source
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AI summary
In a tire, first ridge parts (11) extending in a tire radial direction and second ridge parts (12) extending in the tire radial direction and each having a central portion (12b) in the tire radial direction located on an inner side in the tire radial direction with respect to a central portion (11b) of the first ridge part in the tire radial direction are provided on an outer surface of a side wall part (16) so as to be disposed alternately in a tire circumferential direction, an outer end portion of the second ridge part in the tire radial direction is located on an outer side in the tire radial direction with respect to an inner end portion of the first ridge part in the tire radial direction, and a decorative area (X) in the outer surface of the side wall part, on which at least either the first ridge parts or the second ridge parts are provided, includes a dense area (Y) in which the first ridge part and the second ridge part face each other in the tire circumferential direction, and a sparse area (Z) 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.