Pneumatic Tire Zigzag Grooves Drainage Stability
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Solution Overview
Problem
Pneumatic tires designed for wet roads often compromise steering stability on dry roads due to increased groove volume for drainage, which is critical for high-speed motor sports applications.
Innovation Solution
A pneumatic tire with a tread portion featuring zigzag middle main grooves and middle transverse grooves that enhance drainage and steering stability by guiding water effectively and maintaining rigidity, improving anti-aquaplaning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the groove volume is increased to improve drainage performance on wet roads, then the wet performance is improved, but the ground contacting area is decreased and the rigidity of the tread portion in its land regions is lowered, therefore the steering stability on dry roads is deteriorated
Solution Approach 1:
The patent applies local quality by creating different groove configurations in different regions of the tread. The middle main groove has a zigzag pattern with varying segment lengths to optimize water discharge in specific areas, while maintaining adequate ground contact in other regions. This localized optimization allows improved wet performance without compromising overall steering stability.
Solution Approach 2:
The middle main groove is segmented into first oblique segments and second oblique segments with different circumferential lengths. This segmentation allows different portions of the groove to perform different functions - the longer first segments discharge water more aggressively while the shorter second segments maintain structural integrity and ground contact, resolving the contradiction between drainage and stability.
2Productivity
If the groove volume is increased to improve drainage performance on wet roads, then the drainage performance is improved, but the rigidity of the tread portion in its land regions is lowered
Solution Approach 1:
The patent employs asymmetry by making the first oblique segments have a greater circumferential length than the second oblique segments. This asymmetric configuration optimizes water discharge efficiency in the direction of travel while the shorter second segments provide structural reinforcement, maintaining rigidity despite increased groove volume for improved drainage performance.
Data Source
AI summary
A pneumatic tire is provided in the tread portion with zigzag middle main grooves 4 and shoulder main grooves 5 to define middle land regions 7 therebetween. The middle main groove is composed of alternately-arranged, oppositely-inclined long first oblique segments 11 and short second oblique segments 12. The middle land regions are provided with middle transverse grooves 20 shallower than the middle main grooves. The first oblique segments are inclined axially outwardly toward the opposite direction to the intended tire rotational direction R. The middle transverse grooves are inclined to the same direction as the first oblique segments or in parallel with the tire axial direction. The axially inner end of each of the middle transverse grooves is connected to one of the second oblique segments so as to include at least a part of an axially outwardly protruding outside corner portion 4A of the middle main groove.