Dual Dome Convex Tire Tread Block Stress Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tire tread designs fail to effectively control stress distribution in tread blocks or ribs, leading to irregular wear, particularly at the edges.
Innovation Solution
A tire tread design featuring a dual dome structure with different sized, convex spheroid-shaped domes, where the second dome is positioned on top of the first dome, offering varying radii and orientations to control stress distribution, including concentric or offset centers and elliptical configurations optimized for specific geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single dome is provided on the tread block, then stress distribution is partially improved, but irregular wear at edges persists
Solution Approach 1:
The single dome structure is segmented into two separate domes with different radii of curvature. The first dome has a first radius of curvature and the second dome has a second radius of curvature, where the first radius is greater than the second radius. This segmentation allows different regions of the tread block to have optimized stress distribution characteristics, with each dome addressing specific stress concentration areas that a single dome cannot adequately control.
Solution Approach 2:
Each dome is designed with specific local properties - different radii of curvature, positions, and dimensions - to address local stress distribution needs. The first dome with larger radius provides broader stress distribution while the second dome with smaller radius targets specific high-stress regions. This local quality optimization enables precise control over stress distribution across different areas of the tread block, thereby reducing edge wear.
2Ease of manufacture
If dome size and position are standardized, then manufacturing is simplified, but stress control precision is reduced
Solution Approach 1:
The invention specifies particular parameter ranges for the two domes - the first radius of curvature is greater than the second radius of curvature, with specific dimensional relationships between the domes and the tread block. These parameter definitions provide design guidance that balances manufacturing feasibility with stress control precision. The parameter specifications enable manufacturers to produce domes with controlled variations while maintaining effective stress distribution.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Different sized, first and second domes are stacked, one atop the other on the surface of a rib or tread block of a tire. The lower, first dome spans a larger area of the tread. In one embodiment, the first dome covers the entire tread block or extends laterally across a rib. The upper, second dome is located on top of the first dome and spans only a portion of the first dome. The domes are either concentric or offset, or can be elliptical with the major axes of the ellipses oriented such that the major axes are optimized for a specific tread block or rib geometry. The major axes of the ellipses may be oriented parallel to or perpendicular to an axis of stiffness of the tread block or rib.