Pneumatic Tire Central Groove Design for Ice and Wear
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Solution Overview
Problem
Conventional pneumatic tires that enhance on-ice performance through sipes compromise wear resistance due to reduced land portion rigidity, and existing solutions with improved lateral grooves do not adequately balance both on-ice and wear resistance.
Innovation Solution
A pneumatic tire design featuring circumferentially continuous central main grooves with smaller, zigzag-shaped central narrow grooves that maintain land portion rigidity and enhance edge effect for improved wear resistance and on-ice performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sipes are added to improve on-ice performance, then on-ice performance is improved, but wear resistance deteriorates
Solution Approach 1:
The invention divides the groove structure into multiple types: circumferential grooves for drainage, radial grooves for edge effect, and lateral grooves for structural support. This segmentation allows each groove type to perform its specific function optimally while maintaining overall tire performance and wear resistance.
Solution Approach 2:
Different groove configurations are applied to different regions of the tread pattern. The central land portion has a specific groove arrangement optimized for one function, while shoulder land portions have different arrangements optimized for their specific requirements, allowing local optimization of both on-ice performance and wear resistance.
2Duration of action of stationary object
If lateral grooves are arranged at improved pitches to suppress rubber chipping, then wear resistance is improved, but on-ice performance deteriorates
Solution Approach 1:
The tread pattern employs asymmetric groove arrangements where radial grooves extend to specific distances from groove intersections, creating uneven patterns that enhance edge effects for ice performance while maintaining structural integrity for wear resistance. The groove lengths and positions are deliberately asymmetric to optimize both competing requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tire achieves both enhanced on-ice performance and wear resistance by maintaining land portion rigidity through the use of central narrow grooves, which support each other under ground pressure and exhibit excellent edge effects during cornering.
Implementation Method 1
the rigidity of a land portion is reduced
Implementation Method 2
an action of scratching the ground using edges of the sipe (hereinafter, referred to as an "edge effect")
Implementation Method 3
a water-absorption effect and the like
Data Source
AI summary
A pneumatic tire in which a tread part is provided with a pair of central main grooves extending continuously around the circumference of the tire on both sides of a tire equator C, and central thin grooves extending continuously around the circumference of the tire on the tire-axially inner sides of the central main grooves and having less groove width than the central main grooves. The central thin grooves include a linear first central thin groove running along the tire circumference, and zigzagging second central thin grooves. The first central thin groove is provided on the tire-axially inner sides of the second central thin grooves.