Pneumatic Tire Sidewall Mark Overlap and Height Optimization
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Solution Overview
Problem
Pneumatic tire sidewall marks visibility and durability are compromised due to the conflict between enhancing visibility and maintaining durability, as increasing rubber thickness or hardness leads to increased tire weight and manufacturing challenges, while reducing mark size or height affects design quality and manufacturing costs.
Innovation Solution
A pneumatic tire design where the overlapping area of land parts and marks is limited to no more than 40% of the mark's area, with no more than 60% of marks overlapping, and a protruded height of less than 3 mm, allowing for reinforced sidewalls without degrading visibility or increasing tire weight, and improving mold evacuation during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the protruded height of marks is increased to improve visibility, then mark visibility is improved, but tire weight increases and cracking at the base part of marks occurs
Solution Approach 1:
The patent optimizes the protruded height parameter of marks to a specific range (0.5-3mm) to achieve the best balance between visibility and durability. This parameter optimization prevents excessive weight increase and cracking while maintaining adequate visibility, resolving the contradiction between visibility improvement and weight/durability deterioration.
2Strength
If the overlapping area of land part and marks is increased to allow land part reinforcement, then sidewall durability is improved, but mark visibility is degraded
Solution Approach 1:
The patent defines a specific overlap area ratio parameter (marks overlapping land part ≤ 60%, and overlapping area ≤ 40% of mark area) to balance sidewall reinforcement and mark visibility. This parameter control allows the land part to reinforce the sidewall while preserving sufficient mark visibility, resolving the contradiction between durability improvement and visibility degradation.
3Strength
If the number of marks overlapping with land part is increased to allow land part extension, then sidewall reinforcement is improved, but manufacturing defects increase
Solution Approach 1:
The patent limits the number of marks overlapping with land part to ≤ 60% of total marks, which controls the complexity of the molding process. This parameter limitation ensures adequate mold evacuation and venting while still allowing sufficient land part extension for sidewall reinforcement, resolving the contradiction between reinforcement improvement and manufacturing defect increase.
4Illumination intensity
If mark protruded height is increased to improve visibility, then mark visibility is improved, but poor manufacture occurs during vulcanizing and molding
Solution Approach 1:
The patent optimizes the protruded height parameter to a specific range (0.5-3mm) that balances visibility requirements with manufacturing feasibility. This optimized parameter range ensures adequate visibility while preventing poor manufacture issues such as rubber shortage and molding difficulty, resolving the contradiction between visibility improvement and manufacturing ease deterioration.
Data Source
AI summary
The pneumatic tire 1 is provided with a land part 4 in a sidewall region S of a tire and a plurality of marks 11 protruding from a side wall surface, wherein at least one of the marks 11 partially overlaps with the land part 4 and an area of a portion 12 where a mark is overlapped is not greater than 40% with respect to the total area of a mark. In addition, the number of the marks 11 partially overlapping with the land part 4 is not greater than 60 % with respect to the total number of marks. Further, protruded height of the mark 11 from the side wall surface 21 is not greater than 3 mm.