Motorcycle Tire Block Geometry for Rough Terrain Traction
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Solution Overview
Problem
Motorcycle tires designed for rough terrain face challenges in maintaining excellent performance on both soft and hard road surfaces, with existing designs either compromising traction and cornering on soft surfaces or risking block chipping on hard surfaces.
Innovation Solution
A motorcycle tire with a block tread pattern featuring crown, middle, and shoulder blocks, where the crown blocks are centered on the tire equator, middle blocks overlap with crown blocks, and shoulder blocks are angled to distribute soil and mud effectively on soft surfaces while maintaining rigidity and preventing chipping on hard surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the block area on the ground contacting top surface is decreased to improve traction and cornering performance on soft road surfaces, then the blocks become more susceptible to chipping off during running on hard road surfaces
Solution Approach 1:
The patent applies different block configurations to different regions of the tread. Crown blocks in the center have one geometry optimized for soft surfaces, while shoulder blocks at the edges have different geometry optimized for hard surfaces. This local differentiation allows each region to perform optimally for its specific function without compromising the other.
Solution Approach 2:
The tread is segmented into multiple block types (crown blocks, shoulder blocks, intermediate blocks) with distinct geometries and arrangements. This segmentation allows independent optimization of each block type for its specific location and function, resolving the contradiction between soft surface performance and hard surface durability.
2Reliability
If the block area is increased to prevent block chipping on hard road surfaces, then the traction performance and cornering performance on soft road surfaces deteriorate
Solution Approach 1:
Shoulder blocks located at the tread edges feature larger contact areas and reinforced geometries specifically for hard surface durability, while crown blocks in the center maintain optimized smaller areas for soft surface traction. This localized quality differentiation resolves the contradiction.
Solution Approach 2:
The tread pattern is divided into functional segments with different block characteristics. Intermediate blocks connect the crown and shoulder regions, creating a gradient transition that maintains both soft surface grip and hard surface protection.
3Productivity
If the number of shoulder blocks is increased to improve cornering performance on soft road surfaces, then the complexity of the block arrangement increases
Solution Approach 1:
The shoulder block arrangement features asymmetric positioning and orientation relative to the crown blocks, optimized for cornering mechanics. The blocks are angled and positioned to maximize lateral grip during cornering while maintaining a systematic pattern that limits complexity.
Data Source
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AI summary
A motorcycle tire having a block pattern suitable for running on rough terrain is disclosed. Each middle block overlaps with one of crown blocks at least partially in the tire circumferential direction. The top face of each crown block has an axially long rectangular shape. The top face of each middle block has a substantially pentagonal shape having five sides which are an axially inner side extending in the tire circumferential direction, a pair of transverse sides inclined so that the circumferential distance therebetween is gradually increased, and a pair of axially outer sides inclined so that the circumferential distance therebetween is gradually decreased. In a ground contacting patch of the tire in its normally inflated loaded condition and at the camber angle of zero, only an axially inner part of the top face of each middle block contacts with the ground.