Tire Circumferential Groove Snow Compression Design
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Solution Overview
Problem
Conventional tires with circumferential grooves for improved on-snow performance may experience insufficient driving and braking force, necessitating further enhancements in design.
Innovation Solution
The tire features circumferential grooves with radially protruding groove bottom raised portions and inwardly protruding groove wall portions, comprising repeating units with inclined surfaces, to enhance snow compression and shear force, ensuring improved on-snow performance regardless of tire rotation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional circumferential groove designs are used to improve on-snow performance, then groove structure is simplified, but driving force and braking force become insufficient
Solution Approach 1:
The groove bottom is segmented into multiple groove bottom raised portions (first and second raised portions) with different configurations. Each raised portion has inclined surfaces divided into multiple sections (first, second, and third inclined surfaces), creating a segmented structure that compresses snow effectively while maintaining manageable complexity in the overall groove design.
Solution Approach 2:
Different regions of the groove bottom are given different local qualities through the first and second groove bottom raised portions. The first raised portion has inclined surfaces oriented in one direction while the second raised portion has inclined surfaces oriented in the opposite direction, allowing each local region to optimize snow compression for specific driving conditions.
2Reliability
If groove bottom raised portions are added to improve snow compression, then on-snow performance improves, but manufacturing complexity increases
Solution Approach 1:
The groove bottom raised portions are segmented into discrete units with standardized inclined surface configurations. This segmentation allows for modular manufacturing where each raised portion can be formed using similar tooling and processes, reducing the overall manufacturing complexity despite the increased structural detail required for reliable on-snow performance.
3Reliability
If asymmetric groove bottom raised portions are used to improve directional performance, then on-snow performance varies with rotation direction, but symmetric design reduces performance consistency
Solution Approach 1:
The first and second groove bottom raised portions are configured asymmetrically relative to each other, with inclined surfaces oriented in opposite directions. This asymmetric arrangement ensures that at least one raised portion effectively compresses snow regardless of the tire's rotation direction, maintaining consistent on-snow performance whether the tire rotates clockwise or counterclockwise.
Solution Approach 2:
The second groove bottom raised portion is essentially an inverted version of the first raised portion, with inclined surfaces oriented in the opposite direction. This inversion strategy ensures that when the tire rotates in either direction, one of the raised portions will be positioned to effectively compress snow, thereby maintaining reliable performance consistency across different rotation directions.
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 design significantly improves both driving and braking forces on snow, maintains performance even when worn, and reduces air resonance noise, enhancing overall on-snow and noise performance.
Implementation Method 1
the groove bottom raised portions include a first groove bottom raised portion located on a first side in a width direction of the circumferential groove, and a second groove bottom raised portion located on a second side in the width direction of the circumferential groove, and each of the first groove bottom raised portion and the second groove bottom raised portion comprises a plurality of repeating units each comprising a first bottom surface extending substantially in the tire radial direction, and a second bottom surface inclined with respect to the tire radial direction at a larger angle than the first bottom surface
Implementation Method 2
the groove bottom raised portions... to enhance snow compression and shear force, ensuring improved on-snow performance
Implementation Method 3
the groove bottom raised portions include a first groove bottom raised portion located on a first side in a width direction of the circumferential groove, and a second groove bottom raised portion located on a second side in the width direction of the circumferential groove, and each of the first groove bottom raised portion and the second groove bottom raised portion comprises a plurality of repeating units each comprising a first bottom surface extending substantially in the tire radial direction, and a second bottom surface inclined with respect to the tire radial direction at a larger angle than the first bottom surface
Data Source
AI summary
A tire having a circumferential groove having a groove bottom and a pair of groove walls. The groove bottom is provided with groove bottom raised portions protruding radially outwardly from a reference plane 5a. The groove bottom raised portions are a first groove bottom raised portion located on a first side in the width direction of the circumferential groove and a second groove bottom raised portion located on a second side in the width direction. The first and second groove bottom raised portions each has a plurality of repeating units having a first bottom surface extending substantially in the tire radial direction and a second bottom surface inclined with respect to the tire radial direction at a larger angle than the first bottom surface. The inclination direction of the second bottom surfaces of the first groove bottom raised portion is opposite to the inclination direction of the second bottom surfaces of the second groove bottom raised portion.