Two-Wheeled Vehicle Tire With Variable Block Pitch
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Solution Overview
Problem
Conventional two-wheeled vehicle tyres for rough terrain suffer from insufficient cornering performance due to large circumferential pitch lengths of middle blocks, leading to reduced traction when cornering on hard terrain.
Innovation Solution
A two-wheeled vehicle tyre design featuring a tread portion with crown blocks and middle blocks, where the circumferential pitch lengths of directly adjacent crown blocks are greater than those of middle blocks, with specific pitch length ratios and arrangements to enhance mud discharging and cornering performance, including a crown shallow groove and reinforcing portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If middle blocks are arranged at large circumferential pitch lengths, then mud discharging property is improved, but cornering performance deteriorates due to reduced traction
Solution Approach 1:
The tread is segmented into distinct functional zones: crown blocks for straight-line traction, middle blocks for cornering traction, and shoulder blocks for additional cornering support. Each segment has optimized pitch lengths independent of others, allowing the middle blocks to have smaller pitch lengths for cornering while crown blocks maintain larger pitch lengths for mud discharge
Solution Approach 2:
Different regions of the tread are given different local qualities through varying block pitch lengths. The middle blocks have smaller circumferential pitch lengths specifically optimized for cornering traction, while crown blocks have larger pitch lengths optimized for straight-line traction and mud discharge. This local differentiation allows each region to perform its specific function optimally
2Ease of manufacture
If middle blocks are arranged at large circumferential pitch lengths, then manufacturing simplicity is maintained, but traction during cornering on hard terrain deteriorates
Solution Approach 1:
The tread pattern is divided into distinct block rows with different pitch characteristics. Middle blocks are segmented with smaller pitch lengths specifically for cornering zones, while other areas maintain larger pitches. This segmentation allows optimized cornering traction without requiring complete redesign of the entire tread pattern
Solution Approach 2:
The circumferential pitch length parameter is selectively changed for middle blocks only, reducing it from conventional sizes to the optimized range of 20-35mm. This parameter change is applied locally to middle blocks while other tread elements maintain conventional dimensions, balancing manufacturing simplicity with enhanced cornering traction
Data Source
AI summary
A two-wheeled vehicle tyre includes a tread portion which is provided with a row of crown blocks arranged on a tyre equator and a row of middle blocks arranged axially outwardly of the row of crown blocks. Circumferential pitch lengths of directly adjacent crown blocks are greater than circumferential pitch lengths of directly adjacent middle blocks.