Rough-Terrain Tire Tread Blocks for Mud Traction and Durability
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Solution Overview
Problem
Tires for rough terrain require enhanced traction performance, which existing designs fail to adequately achieve, especially in muddy or soft ground conditions.
Innovation Solution
A tire design featuring blocks with a ground-contacting top surface and radially inward side walls, where the radially outer portion extends straight and inwardly, curving in an arc shape towards the tread base, and the radially inner portion maintains high rigidity, allowing for deeper penetration and improved shear force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the block side wall surface extends straight radially inwardly from the first edge, then the block can exert large shearing force and dig deeply into mud or soft ground, but the block may collapse under heavy loads reducing durability
Solution Approach 1:
The first side wall surface is segmented into two distinct portions: a radially outer portion that extends substantially straight to provide shear force, and a radially inner portion that curves in an arc shape to prevent collapse. This segmentation allows each portion to fulfill its specific function optimally.
Solution Approach 2:
Different portions of the first side wall surface are given different geometric qualities: the radially outer portion has a straight configuration for maximum shear force generation, while the radially inner portion has a curved configuration for structural stability and collapse prevention. Each local region is optimized for its specific functional requirement.
2Productivity
If the radially outer portion length is increased to improve shear force, then traction performance improves, but the block becomes more prone to collapse
Solution Approach 1:
The length of the radially outer portion is optimized to be 30% to 70% of the total block height. This parameter range balances the competing requirements: sufficient length to generate adequate shear force for traction, while limiting the length to prevent excessive stress concentration that would lead to collapse.
3Reliability
If the first side wall surface is made more rigid to prevent collapse, then block durability improves, but the ability to flex and dig into soft ground decreases
Solution Approach 1:
The curved radially inner portion provides dynamic flexibility allowing the block to adapt its shape during ground contact, facilitating penetration into soft terrain. Simultaneously, the overall side wall structure maintains sufficient rigidity to prevent collapse under load, achieving a balance between flexibility and strength.
Data Source
AI summary
A tire for running on rough terrain for which an intended tire rotational direction is specified. The tread portion is provided with blocks raised from a tread base portion. Each block has a first side wall surface comprising a radially outer portion extending substantially straight and radially inwardly, while inclining toward the toe side in the intended tire rotational direction, and a radially inner portion extending from the radially outer portion to the tread base portion while curving in an arc shape. The radially outer portion has a radial length of from 30% to 70% of a radial height of the block.