Pneumatic Tire Sipe Deformation Control
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Solution Overview
Problem
Conventional studless tires with three-dimensional sipes face challenges in balancing wear resistance and ice performance, as uniform three-dimensional shapes can lead to excessive deformation in specific directions, compromising wear resistance and irregular wear resistance.
Innovation Solution
A pneumatic tire design featuring a 2D center portion, a 3D center portion, and 3D side portions with specific three-dimensional shapes that engage in different directions to suppress deformation, ensuring effective wear resistance and ice performance across various wear stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a uniform three-dimensional sipe shape is formed, then deformation in a specific direction (e.g., back and forth direction) is suppressed, but deformation in other directions (e.g., lateral direction) cannot be sufficiently suppressed, leading to reduced wear resistance and irregular wear resistance
Solution Approach 1:
The sipe is designed with different three-dimensional shapes at different locations: the first sipe has wall surfaces engageable in the tire circumferential direction at the center, while the second sipe has wall surfaces engageable in the radial direction at the ends. This local differentiation allows each sipe to suppress deformation in its specific direction, collectively providing comprehensive deformation suppression and maintaining wear resistance.
Solution Approach 2:
The sipe structure is segmented into multiple types (first sipe and second sipe) with different three-dimensional configurations. The first sipe addresses deformation in the circumferential direction, while the second sipe addresses deformation in the radial direction. This segmentation allows the system to handle multi-directional deformation stresses effectively.
2Reliability
If a three-dimensional sipe shape is formed to suppress deformation in multiple directions, then wear resistance improves, but ice performance may be compromised due to excessive rigidity
Solution Approach 1:
Different sipes are strategically placed to engage in different directions: the first sipe engages in the circumferential direction to maintain ice performance, while the second sipe engages in the radial direction to suppress lateral deformation and improve wear resistance. This local differentiation allows the tire to achieve both good ice performance and wear resistance simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tire achieves excellent wear resistance and irregular wear resistance while maintaining ice performance by strategically positioning 3D center and side portions to manage deformation, preventing excessive wear and stress concentration, and enhancing mold releasing performance.
Implementation Method 1
the three-dimensional shape of the 3D center portion has a structure in which wall surfaces are engageable with each other in the length direction, and the three-dimensional shape of the 3D side portion has a structure in which wall surfaces are engageable with each other in the depth direction
Data Source
AI summary
A pneumatic tire has a sipe formed in a land portion of a tread surface. The sipe has a 2D center portion, a 3D center portion and 3D side portion. The 2D center portion is positioned in a sipe bottom side at a center in a length direction. The 3D center portion is positioned in a top surface side at the center in the length direction. The 3D side portion is positioned in one end or both ends in the length direction. The 3D center portion and the 3D side portion are open at the top surface. A three-dimensional shape of the 3D center portion has a structure in which wall surfaces are engageable with each other in the length direction. A three-dimensional shape of the 3D side portion has a structure in which wall surfaces are engageable with each other in the depth direction.