Pneumatic Tire Recessed Center Land for Stability and Shock Resistance
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Solution Overview
Problem
Pneumatic tires with a large width and high aspect ratio face challenges in achieving both excellent steering stability and shock burst resistance, as reducing tread gauge to enhance steering stability compromises shock burst resistance.
Innovation Solution
A pneumatic tire design featuring a recessed portion in the carcass and reinforcing layers of the tread portion, with a curved profile line and strategically positioned auxiliary reinforcing layers, which balances rubber content and out-of-plane rigidity to enhance shock burst resistance while maintaining steering stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the tread gauge is reduced to increase block rigidity for excellent steering stability, then steering stability is improved, but shock burst resistance is degraded
Solution Approach 1:
The invention introduces a recess portion specifically in the bottom region of the center land portion, creating local structural variation. This allows the tread gauge to be reduced in most areas for steering stability while maintaining increased rubber content locally in the center land portion for shock burst resistance. The recess portion with width 10-40% of center land portion width and depth 0.5-2.0mm creates this localized quality difference that resolves the contradiction.
Solution Approach 2:
The invention addresses the contradiction by transitioning from a two-dimensional tread gauge reduction to a three-dimensional structural solution with the recess portion. By creating vertical depth variation (0.5-2.0mm recess depth) in the center land portion, the design achieves both reduced overall tread gauge for steering stability and increased local rubber content for shock burst resistance, effectively using the third dimension to resolve the trade-off.
2Strength
If the rubber content in the center land portion is increased to enhance shock burst resistance, then shock burst resistance is improved, but steering stability is degraded due to increased rubber content
Solution Approach 1:
The recess portion creates localized increased rubber content specifically in the bottom region of the center land portion, rather than uniformly increasing rubber content throughout the tread. This local quality enhancement improves shock burst resistance where needed while maintaining lower rubber content in other areas to preserve steering stability, thus resolving the contradiction through spatially differentiated properties.
Solution Approach 2:
The invention applies partial action by increasing rubber content only in the specific region of the center land portion bottom (within 10% of center land width from tire equator) rather than throughout the entire tread. The recess portion width is limited to 10-40% of center land portion width, creating a controlled partial increase in rubber content that provides shock burst resistance without excessive overall rubber content that would degrade steering stability.
Data Source
AI summary
A pneumatic tire is provided where a profile line in a tire meridian cross section of a center land portion defined by circumferential grooves and located on a tire equator is curved projecting outward in a tire radial direction. A carcass layer and a reinforcing layer include a recess portion curved projecting inward in the tire radial direction in a bottom region of the center land portion.