Off-road motorcycle tyre block reinforcement
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Solution Overview
Problem
Off-road motorcycle tires with high, spaced blocks suffer from rapid wear and fatigue due to increased stress and mobility, leading to tears and wear cracks, especially on hard terrains like rocks and stones, which compromise their performance and lifespan.
Innovation Solution
A motorcycle tire design featuring a high void-to-rubber ratio with blocks spaced apart and surrounded by reinforcing elements that reduce mobility and stress concentration, enhancing durability and traction on varied terrains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high blocks are spaced apart to penetrate soft terrain, then grip and traction are improved, but block mobility increases causing rapid wear on hard terrains
Solution Approach 1:
The tread band is segmented into multiple blocks spaced apart to define a tread pattern with high void-to-rubber ratio, allowing each block to independently penetrate soft terrain while maintaining overall traction. The blocks are separated by voids that enable mud and slush drainage.
Solution Approach 2:
Reinforcing elements are strategically placed at the base of each block where stress concentration occurs during rotation. This local reinforcement provides additional support exactly where needed to prevent tears and wear cracks, without affecting the overall block mobility needed for terrain penetration.
2Ease of operation
If blocks are made high for deep terrain penetration, then traction on soft terrain is improved, but stress concentration at block base increases causing tears and wear cracks
Solution Approach 1:
Reinforcing elements are pre-installed at the base of each block before the tire enters service. These elements act as a cushioning support system that anticipates and mitigates the stress concentration that would otherwise occur at the block base during rotation and terrain contact.
Solution Approach 2:
The tire tread combines rubber blocks with embedded reinforcing elements (such as metal or high-strength polymer inserts) at the block bases. This composite structure provides both the flexibility needed for terrain penetration and the strength required to resist stress-induced failures.
3Productivity
If blocks are spaced far apart for mud drainage, then mud and slush drainage is improved, but block cooperation for stress distribution is reduced
Solution Approach 1:
The tread is divided into discrete blocks separated by wide voids that facilitate efficient mud and slush drainage. Each block acts as an independent element that can penetrate soft terrain while the voids allow trapped debris to be ejected during rotation.
Solution Approach 2:
Reinforcing elements are placed locally at the base of each spaced-apart block to provide stress distribution support. This ensures that even though blocks are far apart for drainage purposes, each block still has adequate structural support to handle applied loads without causing premature failure.
Data Source
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AI summary
Motorcycle tyre (100), having a tread band (8) comprising: - a plurality of bottom surface portions (11); - a plurality of blocks (12) having a respective perimeter, spaced apart from one another so as to define a tread pattern with a void-to-rubber ratio higher than or equal to 50%; - a plurality of reinforcing elements (13) radially extending from said bottom surface portions (11), so as to join said blocks (12), up to a height (t) lower than that of said blocks (12) and surrounding said blocks on at least 60% of their perimeter; characterized in that the portions (11) of said plurality of bottom surface portions have an overall extension greater than 20% of an extension of said tread band (8); - the reinforcing elements (13) have a height (t) which is higher in the central region of the tread band than in the lateral regions.