Off-Road Tyre Tread Segmentation for Stability and Chipping
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Solution Overview
Problem
Existing tires for rough terrain struggle with steering stability on both soft and hard roads, and suffer from block chipping issues, particularly on hard surfaces.
Innovation Solution
The tire design features a tread portion with a crown region, middle regions, and shoulder regions, each with specific block configurations and tie bars that enhance rigidity and ground contact, ensuring improved steering stability and reduced block chipping by optimizing land ratios, tie bar heights, and block connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tread portion has blocks with high ground contact area for soft road traction, then steering stability on soft road is improved, but block chipping on hard road increases
Solution Approach 1:
The patent applies local quality by creating different block configurations in different regions of the tread. The crown region has blocks with larger ground contact area for soft road traction, while the shoulder region has blocks with smaller ground contact area to reduce chipping on hard roads. This regional differentiation allows each area to optimize for its specific function.
Solution Approach 2:
The patent segments the tread portion into distinct regions (crown region and shoulder region) with different block characteristics. This segmentation allows independent optimization of each region's blocks for their specific operational requirements, resolving the contradiction between traction and chipping resistance.
2Object-affected harmful factors
If the tread portion has blocks with small ground contact area for hard road performance, then block chipping is reduced, but steering stability on soft road deteriorates
Solution Approach 1:
The patent implements local quality by assigning different block ground contact areas to different regions. The shoulder region blocks have smaller contact areas to minimize chipping on hard roads, while the crown region blocks have larger contact areas to maintain steering stability on soft roads.
Solution Approach 2:
The patent divides the tread into segmented regions with differentiated block characteristics. This segmentation enables the shoulder region to prioritize chipping resistance while the crown region prioritizes steering stability, resolving the performance contradiction.
3Object-affected harmful factors
If tie bars are made taller to increase block rigidity, then block chipping is suppressed, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the tie bar height within a specific range (10-40mm) to achieve the desired rigidity and chipping suppression while maintaining manufacturability. This parameter optimization balances performance requirements with manufacturing constraints.
Data Source
AI summary
A tyre for running on rough terrain includes a tread portion. The tread portion includes a crown region, middle regions, and shoulder regions. The crown region is provided with a plurality of crown blocks. The middle regions are provided with a plurality of middle blocks. The shoulder regions are provided with a plurality of shoulder blocks. Each of the middle blocks is connected with at least one of the crown blocks by a crown tie bar and connected with at least one of the shoulder blocks by a shoulder tie bar. A land ratio of the shoulder regions is 90% or more and 115% or less of a land ratio of the crown region.