Tire Tread Sipe Structure for Wet and Dry Steering Stability
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Solution Overview
Problem
Existing pneumatic tire designs face a challenge in balancing wet steering stability performance and dry steering stability performance, as increasing the groove area ratio to enhance wet steering stability often deteriorates dry steering stability due to reduced tread rigidity.
Innovation Solution
The design incorporates a main sipe with a chamfered portion and a branch sipe in the land portion of the tire tread, where the depth of the main sipe is equal to or greater than the depth of the branch sipe, to maintain rigidity and drainage performance, thereby enhancing both wet and dry steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the groove area ratio is increased to enhance wet steering stability performance, then wet steering stability is improved, but dry steering stability deteriorates due to reduction in tread rigidity
Solution Approach 1:
The groove is segmented into a main groove and multiple subsidiary grooves that branch therefrom. The main groove extends in the tire circumferential direction while subsidiary grooves extend in the tire width direction, creating a hierarchical structure that optimizes both water evacuation and structural integrity
Solution Approach 2:
Different portions of the groove structure serve different functions: the main groove provides primary water drainage channels for wet steering stability, while the subsidiary grooves provide secondary drainage paths and maintain tread rigidity. The groove depths are also differentiated, with the main groove having a greater depth than the subsidiary grooves
2Reliability
If the groove area ratio is increased to enhance wet steering stability performance, then drainage performance is improved, but dry steering stability deteriorates
Solution Approach 1:
The groove system is divided into a main groove for primary drainage and multiple subsidiary grooves for secondary drainage. This segmentation allows the groove area ratio to be increased for better wet performance while the distributed structure maintains adequate tread rigidity for dry steering stability
Solution Approach 2:
The groove structure extends in multiple dimensions: the main groove extends primarily in the circumferential direction (one dimension) while subsidiary grooves extend in the width direction (another dimension), creating a three-dimensional drainage network that improves wet performance without excessive groove area
Data Source
AI summary
Provided is a pneumatic tire. At least one land portion is defined and formed by a plurality of circumferential main grooves provided in a tread surface. A main sipe including a body portion and a chamfered portion is formed in at least one side of the body portion. A branch sipe branching from the chamfered portion is provided. The depth of the body portion is equal to or greater than the depth of the branch sipe.