Pneumatic Tire Foam Ring Polyurethane Gel Sealant
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Solution Overview
Problem
Existing pneumatic vehicle tires lack an effective internal absorber for automatic sealing in the event of punctures, as known self-sealing solutions require additional adhesives or complex application methods.
Innovation Solution
A polyurethane gel sealant is applied to the inner tire surface, which is sticky immediately after application, allowing a sound-absorbing foam ring to be adherently attached, serving both as a sealant and adhesive for the foam ring, optimizing its placement and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant is applied to the inner tire surface for automatic sealing, then puncture protection is improved, but additional adhesive is required to attach the foam ring
Solution Approach 1:
The patent combines the sealant and adhesive functions into a single substance. The polyurethane gel sealant possesses both sealing capabilities and adhesive properties, eliminating the need for a separate adhesive layer to attach the foam ring to the tire inner surface.
Solution Approach 2:
The sealant is designed to perform multiple functions simultaneously: it provides automatic sealing for punctures and serves as an adhesive for mounting the foam ring. This multi-functional approach simplifies the overall system by reducing the number of separate components needed.
2Strength
If a thick sealant layer is applied to ensure adequate adhesion of the foam ring, then adhesion strength is improved, but the amount of sealant material increases
Solution Approach 1:
The patent modifies the physical and chemical parameters of the sealant, specifically using a polyurethane gel formulation with optimized viscosity and tack properties. This allows the sealant to achieve sufficient adhesion strength at reduced thickness levels compared to conventional sealants.
Solution Approach 2:
The use of polyurethane gel as a composite material provides both the necessary adhesive properties and sealing functionality. The gel structure allows for effective bonding at thinner layers while maintaining the required adhesion strength for foam ring attachment.
3Ease of operation
If the sealant is applied in a relatively liquid state for easy application, then ease of application is improved, but adhesion strength decreases
Solution Approach 1:
The sealant is applied to the tire inner surface in a relatively liquid state to ensure easy distribution and coverage. After application, the sealant undergoes a curing or setting process that transforms it into a tacky gel state, providing sufficient adhesion strength for foam ring attachment. This time-dependent transformation allows both easy application and strong bonding.
Solution Approach 2:
The sealant exhibits parameter changes over time, transitioning from a liquid state during application to a tacky gel state for bonding. This temporal evolution of physical properties enables both ease of application and subsequent adhesion strength requirements to be satisfied at different stages of the process.
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
The solution provides a self-sealing mechanism that ensures the foam ring adheres effectively to the tire, offering puncture protection with adjustable volume and sound-absorbing properties, enhancing the tire's internal sealing efficiency.
Implementation Method 1
The sealant has the tack required for adhesion of a sound-absorbing foam ring, that a sound-absorbing foam ring is adhesively attached to the sealant
Implementation Method 2
a sound-absorbing foam ring is adhesively attached to the sealant... the foam ring is tuned to the tire cavity frequency with regard to its sound-absorbing properties
Implementation Method 3
A polyurethane gel sealant is used as the sealant, which seals automatically and is sufficiently sticky, at least immediately after application to the inner surface of the tire
Data Source
Figure 1
AI summary
The vehicle pneumatic tire has a sound-absorbing foam ring (9) is adhesively attached at the running slat (1) facing the inner surface. An automatically sealing sealant (8) is applied at the foam ring, to adhere the foam ring with required adhesiveness. The sealant is a polyurethane gel, and a viscous mixture of base of a butyl rubber, a polybutene or base of silicon.