Pneumatic Tire Bead Flipper Structure for Cornering Damping
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Solution Overview
Problem
Existing tire designs face challenges in maintaining vehicle attitude during cornering due to increased case rigidity, which reduces damping properties and affects controllability, particularly in critical conditions like gripping force and responsiveness.
Innovation Solution
The tire features a carcass with a flipper and insert reinforcing members, along with thicker side rubber gauging, which enhances longitudinal spring and damping properties without increasing case rigidity, thereby improving axial force and vehicle attitude maintenance during cornering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If case rigidity is increased to improve axial force and cornering performance, then gripping force is improved, but damping property decreases and vehicle attitude maintenance becomes difficult
Solution Approach 1:
The carcass is divided into multiple plies (first ply, second ply, third ply) with different orientations and functions. The first and second plies form the main body, while the third ply is folded back to create the flipper structure. This segmentation allows different regions to provide different mechanical properties - the main body provides axial force while the flipper region provides damping.
Solution Approach 2:
The flipper structure creates a local region with enhanced damping properties through the folded-back third ply and associated rubber layers. This local modification allows the tire to maintain high axial force from the main carcass while providing additional damping in the shoulder region without increasing overall case rigidity.
2Strength
If side reinforcing layer is provided to improve rigidity of tire side portion, then cornering responsiveness is improved, but damping property is reduced
Solution Approach 1:
The flipper structure with multiple rubber layers and folded plies creates a dynamic damping mechanism that allows the tire side portion to be rigid during cornering for responsiveness while providing damping during vertical movements for vehicle attitude maintenance. The multi-layer construction allows differential movement between layers to dissipate energy.
3Stability of the object's composition
If thicker side rubber is used to improve damping property, then vehicle attitude maintenance is improved, but case rigidity increases and axial force is affected
Solution Approach 1:
Instead of increasing rubber thickness uniformly, the invention uses the third ply folded back in a different spatial configuration to create the flipper structure. This dimensional approach provides damping through the folded geometry and multi-layer construction rather than simply increasing material thickness, thereby maintaining case rigidity while providing damping.
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
This configuration improves the tire's axial force and controllability during cornering by optimizing damping properties and maintaining vehicle attitude, ensuring better gripping force and responsiveness.
Implementation Method 1
the rubber for constituting the third reinforcing layer has a 100% modulus smaller than the rubber for constituting the bead filler
Implementation Method 2
enhances longitudinal spring and damping properties
Implementation Method 3
The first cord, the second cord and the ply cord have a tensile modulus larger in this order
Data Source
Figure 1
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Figure 3
AI summary
A body portion (41) and a part of a folded portion (42) of a carcass (40) of a pneumatic tire (10) are formed by a plurality of plies (41 a, 41 b, 42 a, and 42 b). The pneumatic tire (10) is provided with a flipper (70) folded from the inside in the tire width direction to the outside in the tire width direction via a bead core (61) to cover the bead core (61) and a bead filler (62), and an insert (80) is provided between the bead filler (62) and a flipper (70) folded to the outside in the tire width direction. In at least a part of the region where the insert (80) is provided, the thickness (D1) and the thickness (D2) of a side rubber (31) are substantially the same as the ply thickness obtained by combining the body portion (41) and the folded portion (42).