Off-Road Motorcycle Tyre Block Connected Bodies
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Solution Overview
Problem
Motorcycle tires for off-road conditions face durability issues due to stress concentration on block base portions, leading to cracks during motocross and other off-road driving, which affects grip performance.
Innovation Solution
The tire design features block connected bodies with blocks and tie-bars that surround the tread surface, including U-shaped configurations and grooved blocks, which enhance durability and grip by allowing mud compression and discharge, and provide a closed area for improved traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blocks are provided on tread portions to generate high grip in off-road conditions, then grip performance is improved, but stress concentrates on base portions of blocks causing cracks and reduced durability
Solution Approach 1:
The tread portion is segmented into multiple blocks connected by tie-bars, creating a modular structure where stress is distributed across multiple connection points rather than concentrated at block bases, resolving the contradiction between grip performance and durability
Solution Approach 2:
Tie-bars are nested within the block structure, connecting blocks from beneath while maintaining the outer block configuration for grip, allowing the connection elements to be integrated into the functional structure without compromising either performance or durability
2Strength
If blocks are connected with tie-bars to improve durability, then structural strength is improved, but mud may clog between blocks and reduce grip performance
Solution Approach 1:
The connected body is segmented into discrete blocks with spacing between them, preventing mud clogging while maintaining structural connectivity through tie-bars, thus preserving both strength and grip performance
Solution Approach 2:
Different regions of the connected body have different properties: blocks provide localized grip contact points while tie-bars provide structural connection, with spacing between blocks preventing mud accumulation, optimizing both strength and anti-clogging characteristics
3Duration of action of stationary object
If end blocks are connected with tie-bars to maintain structural integrity, then durability is improved, but stress concentration at tie-bar connections may still cause failure
Solution Approach 1:
The connection between end blocks is segmented into multiple tie-bars rather than a single connection, distributing stress across multiple points and reducing stress concentration at any single connection point, thereby improving durability without compromising strength
Data Source
AI summary
A motorcycle tyre for off-road includes a tread portion including a bottom surface and connected bodies. The block connected bodies each include blocks protruding from the bottom surface and tie-bars protruding from the bottom surface with a height smaller than that of the blocks to connect the blocks with one another. The block connected bodies include a first connected body whose blocks and tie-bars are arranged so as to surround the bottom surface at least partially. The first connected body includes a first end block located on a first end in a longitudinal direction of the first connected body and a second end block located on a second end in the longitudinal direction of the first connected body. The first end block and the second end block are adjacent with one another, and no tie-bar connecting the first end block and the second end block is provided.