Pneumatic Tire Zigzag Groove Stability Friction
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Solution Overview
Problem
Pneumatic tires with zigzag main grooves face a trade-off between increased frictional force on snowy/icy roads and compromised steering stability, as reducing zigzag pitch lengths to enhance friction often leads to land region deformation and stability issues.
Innovation Solution
A pneumatic tire design featuring a zigzag main groove pattern with straight or arc-shaped first oblique segments and bent second oblique segments, where the second segments are longer and inclined oppositely, maintains steering stability while providing enhanced traction on snowy/icy roads by controlling groove amplitude and angle configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the zigzag pitch lengths of the main groove are decreased to increase the frictional force on snowy/icy roads, then the running performance on snowy/icy roads is improved, but the steering stability deteriorates due to land region deformation
Solution Approach 1:
The zigzag pattern is segmented into two distinct types of segments: first oblique segments that extend straight and second oblique segments that extend in a bent manner. This segmentation allows each segment type to perform its specific function - the straight segments maintain land region stability while the bent segments increase frictional force through longer edge contact with the road surface.
Solution Approach 2:
Different portions of the zigzag pattern are given different geometric qualities - the first oblique segments are designed to be straight to provide structural support and prevent land region deformation, while the second oblique segments are designed to be bent to increase the scratch frictional force. This local differentiation of geometric properties resolves the contradiction between stability and friction.
2Force
If the zigzag main groove configuration is modified to increase edge length for higher friction, then the frictional force on snowy/icy roads is improved, but the land region adjacent to the groove becomes more likely to deform
Solution Approach 1:
The groove pattern is divided into functionally distinct first and second oblique segments. The first segments with straight extensions maintain structural integrity of adjacent land regions, while the second segments with bent extensions maximize frictional force through increased edge length and complexity.
Solution Approach 2:
The zigzag pattern employs asymmetric segment design where the first oblique segments have straight extensions and the second oblique segments have bent extensions. This asymmetry allows optimization of different portions of the groove for different functions - structural support versus friction generation.
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 excellent running performance on snowy/icy roads while maintaining steering stability, as the specific groove configurations suppress land region deformation and increase frictional force without sacrificing stability.
Implementation Method 1
a zigzag main groove is increased in the length of the edges, and thereby can increase a scratch frictional force
Data Source
AI summary
A pneumatic tire comprises a tread portion 2 provided with at least one circumferentially continuously extending main groove 3. The main groove 3 has a zigzag periodical pattern formed by circumferentially repeatedly arranging a first oblique segment 11 and a second oblique segment 12 as a repeating unit which define one zigzag pitch. The first oblique segment 11 extends without being bent, and the second oblique segment 12 extends in a bent manner.