Pneumatic Tire Axial Groove Variable Depth Design
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Solution Overview
Problem
Pneumatic tires with existing tread patterns struggle to improve drainage and snowy road performance without compromising steering stability and uneven wear resistance, as acute-angled corners wear rapidly and reduce tread pattern rigidity.
Innovation Solution
A pneumatic tire design featuring axial grooves inclined at 30 to 50 degrees and auxiliary grooves with variable depths and widths, where the axial grooves have a shallow and deep part, and auxiliary grooves are inclined opposite to the axial grooves, maintaining rigidity and edge effect to enhance snowy road performance and drainage without sacrificing steering stability and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxiliary grooves are added to improve drainage and snowy road performance, then drainage and snowy road performance are improved, but the acute-angled corners formed between axial grooves and auxiliary grooves wear rapidly and tread pattern rigidity decreases
Solution Approach 1:
The patent applies local quality by making the groove depths variable rather than uniform. Specifically, the axial grooves have different depths at different positions (deeper at the center, shallower toward the edges), and the auxiliary grooves also have variable depths. This localized variation in groove depth creates different local properties that simultaneously improve drainage/snowy road performance while reducing stress concentration at corners to prevent rapid wear.
2Reliability
If auxiliary grooves are added to improve drainage and snowy road performance, then drainage and snowy road performance are improved, but the tread pattern rigidity becomes relatively low in the acute-angled corners
Solution Approach 1:
The patent applies local quality by making the groove depths variable rather than uniform. Specifically, the axial grooves have different depths at different positions (deeper at the center, shallower toward the edges), and the auxiliary grooves also have variable depths. This localized variation in groove depth creates different local properties that simultaneously improve drainage/snowy road performance while reducing stress concentration at corners to prevent rapid wear.
3Reliability
If axial grooves are made deeper to improve snowy road performance, then snowy road performance is improved, but the land zone rigidity decreases
Solution Approach 1:
The patent applies local quality by making the groove depths variable rather than uniform. Specifically, the axial grooves have different depths at different positions (deeper at the center, shallower toward the edges), and the auxiliary grooves also have variable depths. This localized variation in groove depth creates different local properties that simultaneously improve drainage/snowy road performance while reducing stress concentration at corners to prevent rapid wear.
Data Source
AI summary
A pneumatic tire comprises a tread portion provided on each side of the tire equator with a land zone defined between two circumferential main grooves, wherein the land zone is provided with axial grooves extending between the main grooves and inclining to a first circumferential direction at an angle of from 30 to 50 degrees with respect to the tire axial direction, and auxiliary grooves inclining to a second circumferential direction opposite to the first circumferential direction. The axial groove is shallow in its axially-inner-main-groove side in comparison with its axially-outer-main-groove side. The auxiliary groove is deep in its axially-inner-main-groove side in comparison with its axially-outer-main-groove side.