Tire Tread Groove Layout for Wet Drainage and Dry Steering Stability
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Solution Overview
Problem
Current tires face challenges in achieving both steering stability on dry road surfaces and wet performance, as existing designs often compromise on drainage and rigidity.
Innovation Solution
The tire design features a specific arrangement of circumferential grooves and lateral grooves that extend from the tread edges to the tire equator, with some grooves terminating within land portions, enhancing drainage while maintaining rigidity, and includes tie-bars and chamfer portions to improve uniform ground pressure and steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circumferential grooves are extended continuously from tread edges to tire equator, then wet drainage performance is improved, but steering stability on dry surfaces deteriorates
Solution Approach 1:
The continuous circumferential grooves are segmented into multiple sections: first and second shoulder circumferential grooves at the tread edges, and first and second crown circumferential grooves toward the tire equator. This segmentation allows each groove section to be optimized independently - the shoulder grooves provide drainage at the edges while the crown grooves maintain land portion rigidity for steering stability.
Solution Approach 2:
Different regions of the tread are given different groove configurations tailored to their specific functions. The shoulder regions have deeper grooves for drainage, while the crown region has shallower grooves to maintain rigidity. The land portions between grooves are designed with specific widths to balance drainage capability and structural stability in different areas.
2Reliability
If lateral grooves are extended from tread edges inwardly, then water drainage capability is improved, but land portion rigidity deteriorates
Solution Approach 1:
The lateral grooves extend only partially across the land portions rather than completely through them. The first shoulder lateral grooves extend from the first tread edge to the first shoulder circumferential groove, and the second shoulder lateral grooves extend from the second tread edge inwardly but terminate within the second shoulder land portion. This partial extension provides sufficient drainage pathways while preserving the rigidity of the land portions.
3Productivity
If multiple circumferential grooves are arranged between tread edges and tire equator, then drainage efficiency is improved, but device complexity increases
Solution Approach 1:
The circumferential grooves serve multiple functions simultaneously: they provide drainage pathways for water evacuation, create land portions for maintaining steering stability, and define the structural framework of the tread pattern. The first and second shoulder circumferential grooves work together with the first and second crown circumferential grooves to achieve both drainage efficiency and structural integrity without requiring additional separate components.
Data Source
AI summary
A tire includes a tread portion including a first shoulder land portion provided with first shoulder lateral grooves extending from a first tread edge to a first shoulder circumferential groove, a second shoulder land portion provided with second shoulder lateral grooves extending from a second tread edge and terminating within the second shoulder land portion, a first middle land portion provided with first middle lateral grooves extending from the first shoulder circumferential groove and terminating within the first middle land portion, a second middle land portion provided with outer and inner second middle lateral grooves respectively extending from the second crown circumferential groove and the second shoulder circumferential groove and terminating within the second middle land portion, and a crown land portion provided with crown lateral grooves extending from the first crown circumferential groove and terminating within the crown land portion.