Conductive Tire Cord Structure for Static Charge Dissipation
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Solution Overview
Problem
Conventional tires with high silica content accumulate static charge, leading to undesirable static electricity issues during vehicle operation, which existing solutions like antennas fail to adequately address.
Innovation Solution
Incorporating conductive bleeder cords made of a stainless steel-cotton blend yarn with specific resistivity ratios into the tire's structure to dissipate electric charge, along with strategically placed conductive cords and bleeder cords to facilitate gas evacuation and charge dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high silica content materials are used in tires, then tire durability and wear resistance are improved, but static charge accumulation increases
Solution Approach 1:
The patent changes the electrical parameter (resistivity) of specific tire components by incorporating conductive materials. The bleeder cords have a resistivity of 10^4 to 10^6 ohm-cm, while other tire components maintain high resistivity (10^7 ohm-cm or higher). This parameter differentiation creates controlled conductive paths for charge dissipation while preserving the insulating properties of the tire body for durability.
Solution Approach 2:
The conductive bleeder cords serve as intermediary elements that provide a controlled path for static charge dissipation. These cords are positioned between the tire body and the ground, acting as mediators that safely channel accumulated charge away from the vehicle without compromising the overall insulating structure of the high-silica tire.
2Object-generated harmful factors
If conductive materials are added to dissipate charge, then static charge accumulation is reduced, but tire insulation performance may deteriorate
Solution Approach 1:
The patent applies local quality by providing conductive properties only in specific locations where charge dissipation is needed (bleeder cords with 10^4 to 10^6 ohm-cm resistivity), while maintaining insulating properties in the majority of the tire structure (components with 10^7 ohm-cm or higher resistivity). This localized approach allows charge dissipation without compromising overall tire insulation performance.
Solution Approach 2:
The tire structure is segmented into different electrical zones: conductive bleeder cords for charge dissipation and insulating components for maintaining overall insulation. This segmentation allows each part to perform its specific electrical function independently, resolving the contradiction between charge dissipation and insulation performance.
3Object-generated harmful factors
If conventional antennas are used to dissipate charge, then some charge dissipation is achieved, but the solution is complex and may not adequately address static issues
Solution Approach 1:
The tire structure itself provides charge dissipation functionality through the integrated conductive bleeder cords, eliminating the need for separate antenna systems. The bleeder cords are incorporated into the tire's fundamental structure, allowing the tire to serve its own charge dissipation needs without additional complex components.
Solution Approach 2:
The conductive bleeder cords serve multiple functions: they provide charge dissipation pathways, maintain structural integrity, and work within the existing tire architecture. This multi-functionality eliminates the need for separate antenna systems, reducing overall device complexity while effectively addressing static charge issues.
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 effectively reduces static charge accumulation by providing a conductive path for electric charge dissipation and gas venting, enhancing tire performance and safety by minimizing static-related issues.
Implementation Method 1
a plurality of bleeder cords associated with the body ply and disposed circumferentially about the tire and radially between the circumferential tread and the body ply, wherein the plurality of bleeder cords includes at least one conductive bleeder cord
Implementation Method 2
a textile component that permits gas evacuation
Data Source
AI summary
A tire includes at least one annular structure configured to interface with a wheel. The tire also includes a circumferential tread disposed in a crown region of the tire and an intermediate elastomeric layer having a conductive bleeder cord. The conductive bleeder cord extends from the annular structure to at least a middle third of a tread width and includes a metallic component that conducts electric charge and a textile component that permits gas evacuation.