Motorcycle Off-Road Tire Finned Block Traction Design
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Solution Overview
Problem
Current motorcycle tires for rough terrain lack sufficient traction performance, necessitating an enhancement in design to improve contact with the ground and enhance shearing force on uneven surfaces.
Innovation Solution
The tire design incorporates a tread portion with a base surface and raised blocks, including finned blocks with recesses between the fin portions, which are longer in the circumferential direction than in the axial direction, allowing for increased contact and stiffness, thereby improving traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional block designs are used in the tread portion, then the tire structure is simple, but the traction performance on rough terrain is insufficient
Solution Approach 1:
The block is segmented into a block main body and multiple fin portions that extend from it. Each fin portion acts as an independent traction element, allowing the block to engage with rough terrain more effectively. The segmentation creates multiple contact points (fin tips) that can penetrate and grip uneven surfaces, significantly improving traction performance compared to a solid block design.
Solution Approach 2:
The fin portions extend in the tire circumferential direction, adding a dimensional element that increases the active contact perimeter of the block. By extending fins along the circumferential direction rather than only radially outward, the design creates additional shear surfaces that engage with the terrain, transforming a two-dimensional contact patch into a three-dimensional engagement structure.
2Strength
If fin portions are added to the block, then the contact area and stiffness are increased, but the block complexity increases
Solution Approach 1:
The fin portions are merged with the block main body to form an integrated finned block structure. The fins are not separate attachments but are formed as continuous extensions from the main block, creating a unified structure that provides both the stiffness of a solid block and the enhanced traction of multiple fins. This merging eliminates the need for separate fin components while maintaining structural integrity.
Solution Approach 2:
The fin portions are strategically positioned and dimensioned to provide localized stiffness enhancement where needed for traction, while the recess between fins allows flexibility and terrain adaptation. The block main body provides overall structural support, while the fins provide localized ground engagement points, creating different mechanical properties in different regions of the same block structure.
3Force
If recesses are provided between fin portions, then the shearing force is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The recess between fin portions serves multiple functions simultaneously: it reduces material usage, allows the fins to flex independently for better terrain adaptation, and creates a natural pivot point that enhances the shearing action during rotation. The recess structure is self-forming during the molding process, eliminating the need for separate precision machining operations to create the recesses.
Solution Approach 2:
The recess dimensions and positioning are optimized within acceptable manufacturing tolerances to achieve the desired shearing force enhancement. By carefully selecting the recess depth, width, and position relative to the fin portions, the design achieves maximum terrain engagement while remaining compatible with standard tire molding processes, avoiding the need for ultra-precise manufacturing.
Data Source
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AI summary
A tire 1 for a motorcycle for running on rough terrain includes a tread portion 2. The tread portion 2 includes a base surface 8 and a plurality of blocks 10 raised outward in a tire radial direction from the base surface 8. At least one of the plurality of blocks 10 includes a finned block 15. The finned block 15 includes a block main body 16 and at least two fin portions 17 having a smaller width in a tire axial direction than the block main body 16 and extending to one side in a tire circumferential direction. A recess 18 is provided between the two fin portions 17 so as to be recessed from the base surface 8. A length L5 in the tire circumferential direction of the recess 18 is larger than a length L4 in the tire axial direction of the recess 18.