Pneumatic Tire Tread Layout for Dry-Wet Steering Stability
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Solution Overview
Problem
Pneumatic tires face a trade-off between steering stability on dry and wet road surfaces due to the number of lug grooves affecting rigidity and drainage performance, making it difficult to improve both simultaneously.
Innovation Solution
A pneumatic tire design with four main grooves and specific land portion configurations, including curved lug grooves, sipes, and a zigzag center main groove, ensures rigidity and drainage performance, allowing for improved steering stability on both dry and wet surfaces by optimizing the arrangement and orientation of lug grooves and sipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lug grooves in the tread portion is increased, then drainage performance is improved, but the rigidity of the tread portion is reduced and steering stability performance on dry road surfaces is reduced
Solution Approach 1:
The patent applies local quality by providing lug grooves only in the shoulder land portion while maintaining a continuous intermediate land portion without lug grooves. This localized approach allows drainage grooves to be present where they are most needed (shoulder area for wet road drainage) while preserving the rigidity of the intermediate land portion, thereby resolving the contradiction between drainage performance and tread rigidity.
2Strength
If the number of lug grooves in the tread portion is reduced, then the rigidity of the tread portion is improved, but the drainage performance is deteriorated and steering stability performance on wet road surfaces is deteriorated
Solution Approach 1:
The patent concentrates lug grooves in the shoulder land portion where drainage is most critical for wet road performance, while keeping the intermediate land portion continuous and groove-free for maximum rigidity. This localized groove placement optimizes the trade-off by providing drainage capability exactly where needed without compromising overall tread rigidity.
3Reliability
If lug grooves are provided in both intermediate land portion and shoulder land portion, then drainage performance is improved, but the steering stability performance on dry road surfaces is reduced due to reduced rigidity
Solution Approach 1:
The patent applies local quality by restricting lug grooves to the shoulder land portion only, while maintaining a continuous intermediate land portion. This creates different functional zones: the shoulder area with drainage capability for wet road performance, and the intermediate area with continuous structure for dry road steering stability, thereby resolving the contradiction between drainage performance and steering stability.
Solution Approach 2:
The patent segments the tread portion into functionally distinct zones: the shoulder land portion with lug grooves for drainage, and the continuous intermediate land portion for rigidity. This segmentation allows each zone to optimize its specific function without compromising the other, enabling both drainage performance and steering stability to be achieved simultaneously.
Data Source
AI summary
Provided is a pneumatic tire. An outer side intermediate land portion and outer side shoulder land portion have lug grooves extending in a width direction while curving; one end of the lug grooves in the outer side shoulder land portion reaches a ground contact edge, while the other end terminates in the outer side shoulder land portion; one end of the lug grooves in the outer side intermediate land portion communicates with a shoulder main groove and the other end terminates in the outer side intermediate land portion; an opening end of the lug grooves in the outer side intermediate land portion with respect to the shoulder main groove exists on an extension line of the lug grooves in the outer side shoulder land portion; and a pair of lug grooves adjacent in the outer side intermediate land portion are disposed to not overlap each other in the circumferential direction.