Conductive Air Vent Cord Coating for Tire Static Discharge
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Solution Overview
Problem
Conventional pneumatic tires lack sufficient electrical conductivity to effectively discharge static electricity, posing a risk of accidents during refueling and other operations.
Innovation Solution
A pneumatic tire design featuring an electrically conductive coating layer on air vent cords, made from materials like cotton, nylon, or PET, with specific tensile loads and thicknesses, to facilitate electrical communication between the carcass ply and belt layer, allowing static electricity to be discharged to the road surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tire uses conventional rubber materials to maintain physical properties, then the tire structure remains stable, but the electrical conductivity is insufficient to discharge static electricity
Solution Approach 1:
The invention applies electrically conductive coating layers locally on specific air vent cords rather than throughout the entire tire structure. This localized approach provides the necessary electrical conductivity for static discharge while preserving the physical properties of the main tire components. The coating is applied only to selected cords in the air vent region, allowing different parts of the tire to have different functional characteristics.
Solution Approach 2:
The invention uses composite material structure by combining conventional rubber materials with electrically conductive coating materials. The air vent cords consist of a base cord material (such as nylon or polyester) coated with conductive materials like carbon black or metal particles. This composite structure integrates both mechanical strength from the base material and electrical conductivity from the coating layer.
2Reliability
If the tire structure is modified to improve electrical conductivity, then static electricity discharge is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The invention implements partial action by applying conductive coatings to only some air vent cords rather than all cords in the tire. This selective approach provides sufficient electrical conductivity for effective static discharge while significantly reducing the complexity compared to coating the entire tire structure. The partial coverage is adequate to achieve the antistatic function without unnecessary complexity.
3Reliability
If conventional tire materials are used, then manufacturing cost is controlled, but the ability to discharge static electricity is insufficient
Solution Approach 1:
The invention changes the electrical parameter of the tire by introducing conductive coatings on air vent cords, while keeping other parameters such as tire size, pressure, and basic structure unchanged. This parameter modification approach allows the tire to gain static discharge capability without requiring a complete redesign, thereby controlling manufacturing costs while improving safety performance.
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 design enhances electrical conductivity, preventing static electricity accumulation and reducing the risk of accidents by ensuring effective discharge of static electricity through the tire, while maintaining necessary physical properties and reducing manufacturing costs.
Implementation Method 1
an electrically conductive coating layer is formed on a surface of the air vent cord so as to have the electrical conductivity... electrically conductive coating layers among a plurality of air vent cords installed between the carcass ply and the belt layer is formed so as to electrically communicate the carcass ply and the belt layer with each other
Data Source
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AI summary
The present invention provides a pneumatic tire (1), which includes a belt layer (5) laminated and formed on an upper side of a carcass ply (6) inside a tread portion (2), and a plurality of air vent cords (62) arranged between the carcass ply (6) and the belt (5) with a predetermined interval, wherein at least a part of the air vent cords is formed so as to have electrical conductivity (carbon layer; 63), thus to electrically communicate the carcass ply and the belt layer with each other, such that a static electricity generated in a body of an automobile is discharged through the tread grounded to the road surface via the carcass ply which electrically contacts with a tire wheel, thereby preventing an accident that may occur due to the static electricity in the automobile. Fig. 2