Off-Road Motorcycle Tire Shallow Groove Chamfering
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Solution Overview
Problem
Off-road motorcycle tires with shallow grooves are prone to cracking due to strain convergence at intersection portions between the bottom surface and outer wall surface of the blocks, leading to reduced durability and performance.
Innovation Solution
The tire design incorporates chamfered portions with a convex circular arc-like curved surface at the intersection points between the shallow groove and the outer wall surface of the blocks, scattering strain and enhancing cracking resistance, along with notched and recessed features to improve rigidity and mud drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shallow groove is formed in the block to increase edge effect and improve water drainage, then traction and steering stability are improved, but strain converges at the intersection portion between the bottom surface and outer wall surface, making cracks easy to generate
Solution Approach 1:
The invention applies curvature by forming a chamfer portion with a convex circular arc-like curved surface at the intersection portion between the bottom surface and outer wall surface of the block. This curved surface design eliminates sharp corners and distributes strain evenly, preventing strain concentration that leads to cracking while maintaining the shallow groove's functional benefits for traction and water drainage
2Productivity
If the block has a shallow groove to accelerate water drainage and mud removal, then performance on hard or medium hard road is improved, but the block becomes more prone to cracking due to deformation strain
Solution Approach 1:
The chamfer portion with convex circular arc-like curved surface is formed at the intersection portion where strain concentrates during block deformation. This curved geometry maintains the shallow groove's water drainage functionality while distributing mechanical strain to prevent cracking, thus resolving the contradiction between drainage efficiency and cracking resistance
Data Source
AI summary
An off-road motorcycle tire 1 having an improved cracking resistance, comprising a tread portion 2 having a plurality of blocks B, wherein at least one of the blocks B has a shallow groove 17 having a depth D1 of 10 to 50% of a height H1 of the blocks B to provide a shallowly-grooved block 16 in which the block is divided into at least two block segments 16s by the shallow groove 17, the shallow groove 17 has both ends opened on outer wall surfaces 12 of the shallowly-grooved block 16 and it has groove wall surfaces 17w extending radially inwardly from a tread surface 11 of the block and a bottom 17b connecting the groove wall surfaces 17w, and intersection portions 18 between the bottom 17b and the outer wall surfaces 12 are chamfered to form chamfered portions 19 having a convex circular arc-like curved surface.