Rough-Terrain Motorcycle Tire Tread Blocks for Cornering Lightness
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Solution Overview
Problem
Existing motorcycle tires for rough terrain lack excellent rolling characteristics, particularly during cornering, in terms of lightness and response.
Innovation Solution
The motorcycle tire design features a tread portion with blocks that include a protrusion and outer edges forming a minor angle, inhibiting excessive deformation and enhancing moderate deformation during cornering, thereby improving rolling characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional block patterns are used in the tread portion, then the tire can run on rough terrain, but the rolling characteristics (lightness and response during cornering) are insufficient
Solution Approach 1:
The patent applies local quality by creating distinct regions within the block structure - specifically, the outer edge portions are designed with different geometric characteristics (minor angles) compared to the central portions. This local differentiation allows the tire to maintain overall structural integrity for rough terrain while providing specific local areas optimized for rolling response and cornering behavior
Solution Approach 2:
The patent employs asymmetry in the block outer edge design, where the first and second outer edges form minor angles that create an asymmetric geometry relative to the block center. This asymmetric configuration influences the deformation characteristics during cornering, improving rolling response without compromising the symmetric load-bearing capability needed for rough terrain
2Ease of manufacture
If the block outer edges are designed with straight lines, then the manufacturing is simple, but the deformation control during cornering is insufficient
Solution Approach 1:
The patent introduces curvature elements through the minor angles formed by the outer edges of the blocks. Instead of completely straight lines, the edges are designed to form angular configurations that create controlled curvature effects during deformation. This improves cornering response while remaining compatible with standard manufacturing processes for tire treads
Data Source
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AI summary
Provided is a motorcycle tire for running on rough terrain capable of achieving excellent rolling characteristics. The motorcycle tire for running on rough terrain includes a tread portion 2. The tread portion 2 includes a tire equator C, a first tread end T1, and first blocks 11. Each of the first blocks 11 includes a tread surface Ils and an outer side wall 13. The tread surface 11s includes an outer edge 15. The outer edge 15 includes a protrusion 18, a first portion 16, and a second portion 17. The first portion 16 and the second portion 17 are disposed so as to form a minor angle therebetween on the first tread end T1 side.