Pneumatic Tire Tread Block Inclined Edge Mud Shearing
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Solution Overview
Problem
Pneumatic tires for off-road applications face challenges in achieving enhanced mud terrain performance, specifically in traction and self-cleaning abilities, as existing designs do not adequately address consumer demands for improved mud handling and removal.
Innovation Solution
The tire features a tread portion with central block rows having inclined edges and recesses that protrude towards the tire equator, combined with sipes and circular arc portions, which enhance traction and self-cleaning by effectively shearing and expelling mud, while maintaining rigidity and deformation for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the inner block edge is designed with inclined edges protruding toward the tire equator, then traction force on mud terrain is improved, but the structural complexity of the tread block increases
Solution Approach 1:
The inner block edge incorporates a first circular arc portion with a center located on the side of the tire equator, creating a curved surface that effectively shears mud lumps. This curvature design (with radius of curvature typically 5-20mm) transforms the straight edge into a rounded profile that enhances mud shearing capability while maintaining manufacturability through standard molding processes.
Solution Approach 2:
The first inclined edge is designed with a circumferential length longer than that of the second inclined edge, creating an asymmetric configuration. This asymmetry optimizes the shearing action on the leading side of the block where mud contact occurs first, while reducing unnecessary material on the trailing side, thus improving traction without excessive complexity.
2Object-generated harmful factors
If the outer block sidewall is dented with inclined walls crossing each other, then self-cleaning ability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The outer block sidewall is divided into multiple inclined walls (first inclined wall and second inclined wall) that cross each other to form distinct segments. These segmented surfaces create the recess feature that facilitates mud ejection. The segmentation breaks the continuous sidewall into functional zones that independently contribute to self-cleaning, making the complex shape achievable through standard multi-cavity or insert molding techniques.
Solution Approach 2:
The crossing inclined walls form a recess with curved surfaces that guide mud ejection. The curved geometry of the recess (with radii typically 2-10mm) allows mud to be naturally directed outward during tire rotation, improving self-cleaning without requiring extremely tight tolerances, as the curvature provides a built-in ejection pathway.
3Productivity
If the first inclined edge has a longer circumferential length, then mud shearing capability is improved, but the block rigidity may be reduced
Solution Approach 1:
The first inclined edge is designed with longer circumferential length specifically at the regions where mud contact and shearing occur (the leading and lateral edges), while the overall block structure maintains adequate thickness and reinforcement. This local quality enhancement concentrates the shearing functionality where needed without compromising the global structural integrity of the tread block.
Solution Approach 2:
The tread block is formulated using composite rubber materials that combine different polymers and fillers to achieve optimal balance between flexibility (for effective shearing with longer inclined edges) and rigidity (for structural support). The composite formulation allows the block to deform sufficiently for mud shearing while maintaining the strength needed to support the extended inclined edge geometry.
Data Source
AI summary
A pneumatic tire includes a tread portion having a pair of central block rows arranged on both sides of a tire equator. Each of the central block rows includes a plurality of central blocks arranged in a circumferential direction of the tire. Each of the central blocks includes a ground contacting face with an axially inner block edge facing the tire equator. The inner block edge includes a first inclined edge and a second inclined edge inclined in an opposite direction to the first inclined edge so that the inner block edge protrudes toward the tire equator. The first inclined edge includes a first circular arc portion with a center located on the side of the tire equator.