Asymmetrical Zigzag Tread Groove Snow Traction
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Solution Overview
Problem
Pneumatic tires face limitations in traction and handling performance on snowy roads, despite improvements in tread groove configurations.
Innovation Solution
A pneumatic tire design featuring zigzag main grooves with inclined segments and varying groove widths, along with strategically placed lateral grooves and blocks, to enhance shearing force and snow ejection on snowy surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tread groove configurations are used, then manufacturing simplicity is maintained, but traction performance on snowy roads is insufficient
Solution Approach 1:
The main grooves are segmented into multiple sections with different inclination angles (first inclined sections at angle α, second inclined sections at angle β) arranged alternately along the circumferential direction. This segmentation allows each section to perform specific functions: the first inclined sections primarily eject snow, while the second inclined sections generate shearing force, thereby improving traction performance without requiring complete redesign of the entire groove system
Solution Approach 2:
Different portions of the tread grooves are given different local characteristics: the groove widths vary along the circumferential direction (narrower at the crown, wider at the shoulder), and different inclined sections have different angles. This local differentiation optimizes performance in specific regions - the wider shoulder grooves enhance snow ejection, while the varied inclination angles create different mechanical effects in different zones of the tire contact patch
2Reliability
If straight continuous main grooves are used, then structural simplicity is maintained, but snow ejection capability is insufficient
Solution Approach 1:
The main grooves are designed with curved, zigzag patterns instead of straight lines. The grooves include inclined sections that curve at specific angles relative to the circumferential direction, creating a zigzag configuration. This curvature enhances the grooves' ability to eject snow from the contact patch by directing snow outward at angles that prevent it from remaining in the groove, thereby improving snow ejection capability
3Reliability
If uniform groove widths are used, then manufacturing simplicity is maintained, but shearing force generation is insufficient
Solution Approach 1:
The groove width varies along the circumferential direction of the tire, being narrower at the crown portion and wider at the shoulder portion. This gradual width variation creates a tapered effect that enhances shearing force generation as snow is processed through the groove from the crown toward the shoulder. The changing width provides progressive mechanical action on the snow, improving traction without requiring complex variable geometry throughout the entire groove
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
Significantly improves traction and handling performance on snowy roads by increasing shearing force and expediting snow ejection, while maintaining performance on dry surfaces.
Implementation Method 1
improving the traction performance and handling performance on snowy roads by employing a zigzag main groove composed of two kinds of inclined segments which are inclined with respect to the circumferential direction to one axial direction
Implementation Method 2
improves traction and handling performance on snowy roads by increasing shearing force and expediting snow ejection
Data Source
AI summary
A pneumatic tire comprises a tread portion provided with tread grooves defining a asymmetrical tread pattern. The tread grooves include an outboard shoulder main groove and an outboard crown main groove extending zigzag continuously in the tire circumferential direction. The outboard shoulder main groove is composed of alternate long groove segments and short groove segments which are inclined with respect to the tire circumferential direction to the outboard tread edge. The inclination angle θb of the short groove segments is larger than The inclination angle θa of the long groove segments. The groove widths of the long groove segments are gradually increased toward the outboard tread edge.