Pneumatic Tire Conductive Path for Durable Electrostatic Discharge

The patent introduces a conductive rubber layer as an intermediary component between the carcass ply and the conductive fiber. This conductive rubber layer absorbs the mechanical stress and rubbing that would otherwise directly affect the conductive fiber, allowing the fiber to maintain its electrical conductivity over time. The conductive rubber serves as a protective mediator that transfers the electrostatic discharge function while protecting the fragile conductive fiber from mechanical damage.

The patent creates a composite structure combining conductive fiber, conductive rubber, and carcass ply materials. This composite approach allows each material to contribute its specific properties: the conductive fiber provides low electrical resistance, the conductive rubber provides mechanical protection and stress absorption, and the carcass ply provides structural support. The composite structure resolves the contradiction by allowing the conductive fiber to function electrically without directly bearing the mechanical rubbing loads.

The patent segments the electrostatic suppression function from the rolling resistance suppression function. The tread rubber can contain high silica content for low rolling resistance without needing to provide electrostatic suppression. Instead, the electrostatic suppression is handled by separate conductive components (conductive fiber and conductive rubber layer) positioned in different layers of the tire structure. This segmentation allows each component to optimize its specific function without compromising the other.

The patent moves the electrostatic suppression function from the tread surface dimension to the internal tire structure dimension. Rather than relying on the tread rubber's electrical properties, the patent places conductive elements in the carcass ply region and conductive rubber layer, creating a three-dimensional conductive network within the tire. This dimensional shift allows the tread to focus on rolling resistance while internal layers handle electrostatic discharge.