Pneumatic Tire Recess Design for Snow Traction and Dry Stability
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Solution Overview
Problem
Pneumatic tires face a trade-off between maintaining steering stability on dry roads and achieving good on-snow performance, as features like grooves and sipes that enhance snow traction often compromise rigidity and thus stability on dry surfaces.
Innovation Solution
The tire design incorporates circumferentially extending main grooves with recesses on land portions, including first and second recesses arranged to avoid overlap, with specific geometric features like tetrahedral voids and triangular surfaces to compress snow and generate snow-shearing force, while maintaining land portion rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grooves and sipes are added to the tread portion to improve on-snow performance, then snow traction is enhanced, but steering stability on dry road deteriorates due to reduced tread rigidity
Solution Approach 1:
The invention divides the tread portion into multiple land portions separated by grooves, and further segments each land portion by providing recesses at specific positions. This segmentation creates distinct functional zones: the grooves handle snow evacuation and traction, while the recessed land portions maintain structural rigidity for steering stability, thus resolving the contradiction between on-snow performance and dry road steering stability
Solution Approach 2:
The invention applies different structural characteristics to different regions of the tread. The grooves are designed with specific depths and patterns for snow traction, while the land portions are strategically recessed to maintain rigidity. This local differentiation allows each region to optimize its function - grooves for snow engagement and land portions for structural support - thereby achieving both improved on-snow performance and maintained steering stability
2Stability of the object's composition
If recesses are provided on land portions to maintain rigidity and steering stability, then steering stability on dry road is ensured, but on-snow performance may be compromised
Solution Approach 1:
The recesses are pre-positioned at specific locations on the land portions, predetermined through design to optimize both rigidity and snow interaction. By establishing these recesses in advance during manufacturing at optimal positions, the tire structure is prepared to simultaneously achieve steering stability through maintained rigidity and on-snow performance through controlled snow compression in the recessed areas
Solution Approach 2:
The recessed land portions serve multiple functions: they maintain structural rigidity for steering stability on dry roads, while simultaneously providing snow compression chambers for improved traction on snowy surfaces. This multi-functionality allows the same structural feature to address both contradictions, making the tire design universally effective across different road conditions
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
This design enhances traction on snowy roads by generating a large snow-shearing force while ensuring excellent steering stability on dry roads through effective snow compression and land portion rigidity.
Implementation Method 1
Such a recess may compress snow introduced therein effectively, and then may generate large snow-shearing force by shearing the compressed snow
Implementation Method 2
the third surface of each first recess slopes radially inwardly toward one side in a circumferential direction of the tire, and the third surface of each second recess slopes radially inwardly toward the other side in the circumferential direction of the tire
Data Source
AI summary
Provided is a pneumatic tire which has both improved driving stability performance on a dry road surface and improved on-snow performance. A pneumatic tire has defined on the tread first lands and second lands. The first lands and the second lands are provided with recesses. The recesses include first recesses provided in first edges of the first lands, and also include second recesses provided in second edges of the second lands. The second recesses are provided so as not to intersect projection regions formed by projecting the first recesses onto the second edges in the axial direction of the tire.