3D Tire Sipe Structure for Traction, Stiffness, and Mold Release
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Solution Overview
Problem
Tires with sipes face a trade-off between traction in adverse road conditions and stiffness for dry road conditions, leading to irregular wear patterns and difficulties in mold extraction due to the design of sipe blades.
Innovation Solution
A tire sipe design featuring opposing tread element portions with quadrilateral-shaped planar surfaces oriented at 90 degrees, including radially outer and inner zig-zag portions and three-dimensional features, which interlock to maintain stiffness and reduce undercut surface geometry, thereby improving traction and ease of mold extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of sipes in a tire tread block is increased to improve traction in adverse road conditions, then traction performance is improved, but block stiffness is reduced leading to irregular wear patterns and decreased performance in dry road conditions
Solution Approach 1:
The sipe design implements local quality by creating a three-dimensional structure with radially outer and inner zig-zag portions that concentrate stiffness in specific radial zones while maintaining traction-enhancing features in contact areas. The radially outer zig-zag portion provides stiffness near the tread surface, while the radially inner zig-zag portion maintains structural integrity deeper in the tread block, allowing localized reinforcement without compromising overall flexibility.
Solution Approach 2:
The invention transitions from conventional two-dimensional sipe designs to a three-dimensional structure by adding radial depth variations with outer and inner zig-zag portions. This dimensional change allows the sipe to provide both traction benefits (through increased surface edges) and stiffness (through vertical interlocking structures) that cannot be achieved with planar sipe configurations alone.
2Reliability
If sipe blades are designed with complex geometry to achieve desired traction and stiffness, then traction and stiffness requirements are met, but the force necessary to extract the mold from the cured tire increases
Solution Approach 1:
The sipe blade design applies partial action by implementing the three-dimensional sipe structure only in the radially outer and inner zig-zag portions where traction and stiffness are most critical, while reducing or eliminating complex geometry in the radially inner portion near the mold contact area. This selective application of complexity maintains performance benefits while reducing mold extraction forces.
Data Source
AI summary
Various embodiments of a tire having a three-dimensional tire sipe are disclosed. In one embodiment, a tire having a sipe is provided, the tire comprising: opposing tread element portions separated by the sipe, each opposing tread element portion including a plurality of positive elements and a plurality of negative elements, wherein the plurality of positive elements and the plurality of negative elements include three substantially quadrilateral-shaped planar surfaces, each planar surface being oriented relative to another planar surface by an angle of 90 degrees, wherein the three planar surfaces meet at a rounded terminal portion, wherein the sipe includes a radially outer zig-zag portion, wherein the sipe includes a radially inner three-dimensional portion radially inward of the radially outer zig-zag portion, and wherein the sipe includes a radially inner zig-zag portion radially inward of the radially inner three-dimensional portion.