Pneumatic Tire Center Blocks with Bent Narrow Grooves
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Solution Overview
Problem
Pneumatic tires face a trade-off in improving wet performance and maintaining even wear resistance, as increasing the groove area for better wet traction leads to uneven wear and reduced rigidity, which affects drainage properties and overall performance, especially in vehicles with varying loads.
Innovation Solution
The design incorporates a specific configuration of circumferential main grooves, center lug grooves, and center blocks with bent portions and overlapping regions, optimizing the groove geometry to enhance edge components and friction while minimizing uneven wear through controlled groove depth and width ratios and bent angles, ensuring improved wet performance without compromising wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the groove area is increased to improve wet performance, then drainage properties and wet traction are improved, but block rigidity decreases leading to uneven wear
Solution Approach 1:
The center blocks are divided into multiple segments by introducing center narrow grooves that extend in the tire circumferential direction. These grooves partition the center blocks into plurality of center block segments, which improves drainage properties and wet performance while the segmentation pattern is designed to maintain overall block rigidity and prevent uneven wear.
Solution Approach 2:
Different regions of the tread surface are given different groove configurations. The center blocks have center narrow grooves with specific patterns (including bent portions) while other blocks have different groove arrangements. This local differentiation allows optimization of wet performance in the center region without compromising the rigidity and wear characteristics of the overall tread.
2Reliability
If the groove area is increased to improve drainage properties, then wet performance is improved, but the tread surface becomes more susceptible to uneven wear
Solution Approach 1:
The center blocks are segmented by center narrow grooves into multiple center block segments. This segmentation enhances drainage capabilities by creating additional channels for water evacuation while the specific configuration (bent portions, connection to circumferential main grooves) ensures that the segmentation does not create weak points that would lead to uneven wear.
Solution Approach 2:
The center narrow grooves include bent portions that curve in the tire circumferential direction rather than extending straight. This curvature increases the edge components and friction for improved wet traction while distributing stress more evenly across the block segments, preventing localized wear patterns.
3Reliability
If the groove depth and width are increased to enhance wet traction, then friction and drainage are improved, but the blocks become less rigid and wear unevenly
Solution Approach 1:
The center narrow grooves are configured with specific depth and width dimensions that are optimized for wet performance. The grooves extend only to a controlled depth and have specific width characteristics that provide adequate drainage and friction enhancement without creating excessively large voids that would compromise block rigidity and lead to uneven wear.
Solution Approach 2:
The bent portions in the center narrow grooves create curved paths that increase the effective edge length and friction surface area for improved wet traction. The curvature also helps distribute mechanical stresses more evenly across the block segments during rolling and loading, preventing stress concentration that would cause uneven wear.
Data Source
AI summary
A pneumatic tire includes a pair of circumferential main grooves, a plurality of center lug grooves, and center blocks. The pair of circumferential main grooves are disposed on both sides of a tire equatorial plane in a tire lateral direction. The tire equatorial plane is interposed between the pair of circumferential main grooves. The pair of circumferential main grooves extend in a tire circumferential direction and oscillate in the tire lateral direction. The plurality of center lug grooves have both ends connected to the pair of circumferential main grooves. The center blocks are defined by the center lug grooves and the pair of circumferential main grooves. The center lug grooves have bent portions at two or more positions. The center blocks include center narrow grooves having both ends connected to the pair of circumferential main grooves. The center narrow groove has bent portions at two or more positions.