Tire Tread Zigzag Sipes for Stress Distribution
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Solution Overview
Problem
Conventional tire treads face issues with uneven wear and stress distribution due to the arching of the contact patch in the tire's radial direction, leading to potential cracking and reduced flexibility.
Innovation Solution
A tire tread design featuring circumferential ribs with zigzag sipes extending both axially and radially, incorporating curved, cylindrical radially innermost surfaces to enhance flexibility and stiffness, and terminating in notches for improved stress management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sipes extend only axially across the rib, then manufacturing is simpler, but circumferential flexibility is reduced and cracking is more likely
Solution Approach 1:
The sipes are configured to extend not only axially across the rib but also radially inward from the radially outer surface, creating a multiplanar or doubly corrugated zigzag pattern. This addition of the radial dimension to the traditional axial-only sipe configuration enhances circumferential flexibility while maintaining structural integrity and reducing cracking.
2Stability of the object's composition
If the contact patch is allowed to arch naturally, then the tire structure is simpler, but stress distribution becomes uneven and cracking occurs
Solution Approach 1:
The tread is divided into multiple circumferential ribs with sipes extending through them. This segmentation creates multiple stress distribution zones across the tread width, preventing stress concentration in any single region and promoting more uniform stress distribution during tire operation.
Solution Approach 2:
The multiplanar sipes that extend both axially and radially create additional stress relief pathways in the radial direction, complementing the axial stress distribution. This three-dimensional sipe configuration helps manage stress more effectively across the tread structure.
3Reliability
If sipes have straight radial extensions, then manufacturing is easier, but cracking resistance is reduced
Solution Approach 1:
The sipes incorporate curved or cylindrical radially innermost surfaces instead of straight radial extensions. This curvature distributes stress more evenly at the sipe termini, preventing stress concentration that leads to cracking, while the curved geometry can be achieved through standard molding techniques.
Solution Approach 2:
The complex multiplanar zigzag configuration, while more difficult to manufacture, converts the potential harm of simple straight sipes (which crack easily) into a beneficial three-dimensional stress-distributing structure that significantly improves cracking resistance and tread durability.
Data Source
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AI summary
A tread (11) for a tire (10) is disclosed. The tread (11) comprises a plurality of circumferential ribs (12, 14, 16), at least one, several or all of the ribs (12, 14, 16) having sipes (100) extending in a zigzag manner as the sipes extend axially across the respective rib (12, 14, 16) and also extending in a zigzag manner as the sipes (100) extend radially inward from a radially outer surface of the respective rib (12, 14, 16).