Off-Road Motorcycle Tire Center Block Geometry for Grip and Durability
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Solution Overview
Problem
Existing motorcycle tires for rough terrain improve traction performance at the cost of reduced durability due to the limited durability of block shapes.
Innovation Solution
A tire design featuring a crosslinked rubber tread with center blocks having a center of gravity on the equator plane, an axial length twice the circumferential length, a hardness of not greater than 70, and a 300% modulus of not less than 8.5 MPa, ensuring stiffness for enhanced grip and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shapes of blocks are controlled to improve grip force, then traction performance is improved, but durability of blocks is reduced
Solution Approach 1:
The invention applies different physical and geometric properties to different parts of the main center block. Specifically, the block has a controlled axial length to circumferential length ratio of 2:1 or more, hardness of 60-70, and 300% modulus of 8.5 MPa or more. This local differentiation of properties allows the block to provide both high grip force through appropriate geometry and high durability through optimized material properties, resolving the contradiction between traction performance and durability.
2Force
If blocks are made to scratch road surface for frictional force, then grip force increases, but blocks wear faster
Solution Approach 1:
The invention changes the physical parameters of the main center block, specifically setting the axial length to circumferential length ratio to 2:1 or more, hardness to 60-70, and 300% modulus to 8.5 MPa or more. These parameter changes optimize the block's ability to generate frictional force while maintaining the strength needed to resist wear, thereby resolving the contradiction between frictional force generation and block strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tire achieves improved traction performance without compromising durability by increasing contact area and resistance to deformation and damage.
Implementation Method 1
a tread formed from a crosslinked rubber
Implementation Method 2
The tire obtains frictional force by scratching a road surface with the blocks
Data Source
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AI summary
A tire 2 includes a tread 4. The tread 4 includes a plurality of blocks 18. The plurality of blocks 18 include a plurality of center blocks 28 located on an equator plane. The plurality of center blocks 28 include a main center block 28m having, in a land surface 20 thereof, a center of gravity CG of the land surface 20. At the center of gravity CG of the land surface 20 of the main center block 28m, an axial length a of the main center block 28m is not less than twice a circumferential length b thereof. The main center block 28m has a hardness of not greater than 70. The main center block 28m has a 300% modulus of not less than 8.5 MPa.