Tire Bead Conductive Path for Low Rolling Resistance
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Solution Overview
Problem
Tires face challenges in reducing rolling resistance while ensuring effective release of static electricity from vehicles to the ground, as decreasing carbon content in carcass rubber increases volume resistivity, potentially blocking conductive paths.
Innovation Solution
Incorporating a conductive rubber portion embedded in the carcass ply, with at least a part of the embedded portion located outside the bead core in the tire radial direction, to create a conductive path for static electricity release regardless of the carcass ply's conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the amount of carbon contained in the carcass rubber is decreased to reduce rolling resistance, then the volume resistivity of the carcass rubber increases, but this blocks the conductive path from the bead portion to the tread surface portion
Solution Approach 1:
A conductive rubber portion is introduced as an intermediary element between the bead core and the tread surface. This conductive rubber portion includes an embedded portion embedded in the carcass ply and extends outward in the tire radial direction, creating an alternative conductive path that bypasses the need for carbon in the carcass rubber itself.
Solution Approach 2:
The tire structure combines different materials with complementary properties: the carcass rubber with low carbon content for reduced rolling resistance, and the conductive rubber portion with high conductivity for static electricity release. This composite approach allows each material to optimize its specific function without compromising the other.
2Reliability
If a conductive rubber portion is added to ensure static electricity release, then the conductive path is improved, but the device complexity increases
Solution Approach 1:
The conductive rubber portion is merged with the existing carcass ply structure through embedding. The embedded portion is integrated into the carcass ply while extending outward, combining the structural function of the carcass ply with the conductive function of the rubber portion in a single integrated element rather than separate components.
Solution Approach 2:
The conductive rubber portion serves multiple functions: it provides a conductive path for static electricity release, maintains structural integrity as part of the carcass assembly, and extends radially outward to ensure proper electrical connection from the bead core to the tread surface.
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
This configuration allows for easy release of static electricity to the ground, even with low conductivity carcass plies, while maintaining reduced rolling resistance by minimizing carbon content in carcass rubber.
Implementation Method 1
a conductive rubber portion which includes an embedded portion embedded in the carcass ply, wherein at least a part of the embedded portion is located on an outside in a tire radial direction in relation to the bead core
Data Source
AI summary
An aspect of a tire of the present invention is a tire provided with a tread portion (11), a sidewall portion (12), and a bead portion (13), the tire includes a bead core (60) which is provided in the bead portion (13), a carcass ply (51) which covers at least a part around a core axis of the bead core (60), and a conductive rubber portion (80) which includes an embedded portion embedded in the carcass ply (51), and at least a part of the embedded portion is located on an outside in a tire radial direction in relation to the bead core (60).