Pneumatic Tire Distortion Restraining Layer
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Solution Overview
Problem
Existing pneumatic tire designs where the carcass ply is in direct contact with the bead cores suffer from tensile force-induced breakage or deterioration due to inter-pressure, leading to reduced durability.
Innovation Solution
A pneumatic tire structure with a carcass ply wound from the outside to the inside in the direction of width, featuring a distortion restraining layer between the bead fillers and the carcass ply to prevent distortion at the wind-up ends, which includes a layer of steel cord members or organic fibers arranged obliquely to reinforce the wind-up ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the carcass ply is in direct contact with the bead cores, then the tensile force distribution is improved and control stability is enhanced, but the carcass ply and bead core scrape against each other under inter-pressure, leading to breakage or deterioration of durability
Solution Approach 1:
The patent introduces a distortion restraining layer as an intermediary component between the bead filler and the carcass ply. This layer prevents direct contact and scraping between the carcass ply and bead core while maintaining the beneficial tensile force distribution, thereby resolving the contradiction between control stability and durability
Solution Approach 2:
The distortion restraining layer is positioned in advance at the wind-up end portion of the carcass ply to prevent distortion before it occurs. This preliminary protective action prevents the scraping and deterioration that would otherwise happen during tire operation, maintaining both control stability and durability
2Stability of the object's composition
If the carcass ply is wound up from the outside to inside in the direction of width of tire, then the tensile force distribution is changed to improve control stability, but the wind-up end portion becomes prone to distortion and separation
Solution Approach 1:
The patent applies a distortion restraining layer specifically at the wind-up end portion of the carcass ply where distortion occurs, rather than uniformly throughout the entire carcass ply. This localized reinforcement maintains the overall wound-up structure's control stability while specifically addressing the weakness at the wind-up end
Solution Approach 2:
The distortion restraining layer is constructed as a composite structure with cord members having specific tensile strength and arrangement patterns (e.g., oblique arrangement at specific angles). This composite material approach provides targeted resistance to distortion at the wind-up end while maintaining the flexibility and performance of the overall carcass ply structure
Data Source
AI summary
A pneumatic tire according to the invention includes: a pair of left and right beads 3 each including a bead cores 3a and bead fillers 3b; a carcass ply 5 extended around the bead cores 3a; and an inner liner 4 arranged on an inner peripheral side of the carcass ply 5, and is characterized in that the carcass ply 5 is wound up around the bead cores 3a from the outside in the direction of width of tire to the inside in the direction of width of tire, and a distortion restraining layer 7 configured to restrain distortion of the winding ends 5a of the carcass ply 5 is provided between the bead fillers 3b and the carcass ply 5 so as to overlap with a wind-up ends 5a of the carcass ply 5.