Tire Tread Block Geometry for Mud Guidance
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Solution Overview
Problem
Existing tires for rough terrain on muddy roads face issues with mud being scraped laterally, reducing traction due to ineffective mud management between crown and middle blocks.
Innovation Solution
A tire design featuring axially-elongated crown and middle blocks with specific angular inclinations and gap configurations to guide mud centrally, enhancing traction by preventing lateral mud escape and promoting mud shear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If crown blocks and middle blocks are arranged in conventional configurations, then the tire structure is simple, but mud is scraped laterally during running on muddy roads, reducing traction
Solution Approach 1:
The crown blocks and middle blocks are designed with asymmetric ground contacting surfaces featuring inclined edges at specific angles (10-45 degrees) relative to the tire axial direction. This asymmetric configuration creates directional mud guidance that prevents lateral mud escape while maintaining structural simplicity, thereby resolving the contradiction between improving traction and avoiding excessive complexity
Solution Approach 2:
The patent applies local quality by creating specific geometric features (inclined edges, concave portions) at critical locations on the block surfaces. These localized structural modifications optimize mud interaction at specific contact points without requiring complete redesign of the entire block structure, thus improving traction while limiting overall complexity increase
2Force
If crown blocks have large contact area with ground, then traction is improved, but mud clogging between blocks increases
Solution Approach 1:
The tread portion is segmented into multiple crown blocks and middle blocks arranged in specific patterns with controlled gaps. This segmentation allows each block to maintain adequate contact area for traction while the gaps between blocks prevent mud clogging by allowing mud to escape laterally, thus resolving the contradiction between large contact area and mud clogging prevention
Solution Approach 2:
The patent converts the potentially harmful effect of mud accumulation into a beneficial feature by designing inclined edges and gaps that guide mud flow. The mud that would normally clog the blocks is instead directed through the gaps and along the inclined surfaces, transforming from a harmful clogging agent to a lubricating medium that enhances traction without causing blockage
3Ease of operation
If blocks are arranged in axially-elongated shape, then mud guidance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies parameter ranges (inclination angles of 10-45 degrees, axial length to circumferential length ratios) rather than exact values, allowing manufacturing flexibility while maintaining functional effectiveness. This approach to parameter specification improves ease of operation through effective mud guidance while accommodating normal manufacturing tolerances, thus resolving the contradiction between operational effectiveness and precision requirements
Data Source
AI summary
A tire for running on rough terrain comprises a tread portion 2 bound with an intended tire rotational direction. The tread portion 2 comprises a row of crown blocks 10 and rows of middle blocks 11. The crown blocks 10 and the middle blocks 11 each has an axially-elongated shape. A crown front edge 15 of each of the crown block 10 comprises a most concave portion 18 positioned at the most toe-side thereof in the tire rotational direction and a pair of inclined edges 20 extending from the most concave portion 18 toward axially both sides thereof and toward the heel-side in the tire rotational direction. The inclined edges 20 are each inclined at an angle from 10 to 45 degrees with respect to the tire axial direction. A middle front edge 21 of each of the middle blocks 11 extends axially outwardly and is inclined to the heel-side.