Multi-Ply Tire Turn-Up Layout for Radial Height Stability
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Solution Overview
Problem
Existing tire designs with multiple body plies lack optimal radial height distribution and stabilization, leading to inefficiencies in tire structure and performance.
Innovation Solution
A tire design featuring multiple body plies with varying turn up heights and stabilizer ply inserts, where each body ply wraps around annular beads with specific turn up portions and stabilizer inserts, providing enhanced radial height distribution and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If body plies are applied with decreasing widths from first to subsequent plies, then the tire structure is simplified, but the radial height distribution becomes non-uniform with the outermost turn up having greatest height
Solution Approach 1:
The patent applies asymmetry by varying the widths of body plies in a non-uniform pattern. Specifically, the first body ply has a first width, the second body ply has a second width less than the first width, and the third body ply has a third width greater than the first width. This asymmetric width distribution creates different turn up heights at different radial positions, allowing optimization of the tire's radial height profile while maintaining structural integrity.
2Shape
If multiple body plies with varying widths are used, then radial height distribution can be optimized, but the tire structure becomes more complex
Solution Approach 1:
The patent applies local quality by assigning different widths to different body plies based on their specific positional requirements within the tire structure. The first body ply has a first width suitable for its position, the second body ply has a reduced second width for its specific functional zone, and the third body ply has an increased third width for its particular radial position. This localized optimization of ply widths allows precise control over radial height distribution while minimizing overall structural complexity.
3Shape
If turn up portions extend to different radial heights, then radial height distribution is achieved, but stability and structural integrity are compromised
Solution Approach 1:
The patent applies the nesting principle by arranging body plies in a nested configuration where each subsequent body ply is positioned within the radial envelope of the previous ply. The first body ply extends to a first radial height, the second body ply is nested within it extending to a second radial height, and the third body ply is nested within the second extending to a third radial height. This nested arrangement ensures that turn up portions at different radial heights are structurally integrated, maintaining stability and structural integrity while achieving the desired radial height distribution.
Data Source
AI summary
A tire includes a pair of beads and a plurality of body plies extending between the pair of beads, including at least a first body ply and a second body ply. The first body ply wraps around each of the pair of beads, and has a first pair of turn up portions having a first height. The second body ply wraps around each of the pair of beads, and has a second pair of turn up portions having a second height greater than the first height. Each of the second pair of turn up portions is axially inside each of the first turn up portions. The tire also includes a circumferential belt disposed radially above the plurality of body plies, a circumferential tread disposed radially above the circumferential belt, and a pair of sidewalls extending between the pair of beads and the circumferential tread. The tire also has a pair of stabilizer ply inserts, including a first stabilizer ply insert and a second stabilizer ply insert.