Pneumatic Tire Sealant Layer Uniformity via Light Point Positioning
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Solution Overview
Problem
Pneumatic tires with sealant layers on the inner surface often suffer from non-uniformity, which can impact their performance and puncture prevention effectiveness.
Innovation Solution
A method and configuration where a belt-like sealant material is applied in a spiral pattern along the tire's inner surface, with annular circling parts arranged in parallel in the tire-width direction, and the winding start and end positions corresponding to the tire's light point, ensuring uniform distribution and improved balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant layer is provided on the tire inner surface to prevent punctures, then puncture prevention capability is improved, but tire uniformity deteriorates
Solution Approach 1:
The patent applies local quality by positioning sealant material specifically at the light point (a localized area) rather than uniformly across the entire tire inner surface. The sealant layer is formed with varying thickness, being thicker at the light point and thinner at other positions, which locally enhances puncture prevention where needed while minimizing impact on overall tire uniformity.
Solution Approach 2:
The patent employs preliminary action by pre-determining the light point position through static unbalance measurement before applying the sealant layer. This allows the sealant to be strategically positioned in advance to compensate for the identified unbalance, ensuring that the uniformity improvement is built into the tire structure before final assembly.
2Reliability
If sealant material is applied continuously in a spiral shape along the tire inner surface, then puncture prevention coverage is improved, but application complexity increases
Solution Approach 1:
The patent segments the continuous spiral sealant application into discrete annular circling parts. Instead of applying sealant in one continuous spiral motion, the application process divides the tire circumference into multiple separate annular segments, which simplifies the coating mechanism and makes it easier to control the sealant distribution while maintaining comprehensive coverage.
Solution Approach 2:
The patent transitions from a two-dimensional continuous spiral application to a three-dimensional arrangement where multiple annular circling parts are stacked in the tire-width direction. This dimensional change allows the sealant to cover the entire tire circumference through layered annular segments, achieving comprehensive coverage with a simpler application process.
Data Source
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AI summary
A pneumatic tire and a production method thereof are provided which can improve the uniformity of a pneumatic tire equipped with a sealant layer at the tire inner surface. Provided are: a static unbalance position measuring step; a light point ascertaining step ; and a sealant layer forming step of providing a sealant layer 60 arranging in parallel in a tire-width direction a plurality of annular circling parts 62 , by coating sealant material 61, while circling along the tire-circumferential direction and while transitioning a path of circling to one direction side in the tire-width direction at least every one circling, in which the sealant layer forming step disposes a winding start 61A and a winding end 61B at a tire-circumferential direction position corresponding to the light point K, in which sealant material increasing parts 62A1, 62B1 are respectively arranged at the winding start 61A and the winding end 61B.