Tire Conductive Fiber Path for Static Dissipation and Low Rolling Resistance
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Solution Overview
Problem
Reducing carbon in tire coating rubber to lower rolling resistance increases electrical resistance, blocking the conductive path from the bead portion to the tread portion and hindering static electricity dissipation to the road surface.
Innovation Solution
A tire structure with conductive rubber chafers, reinforcement layers, and a conductive fiber member forming a conductive path from the bead portion to the tread portion, allowing static electricity to dissipate to the road surface while maintaining low rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the amount of carbon in the coating rubber of the carcass ply is reduced to lower rolling resistance, then the loss tangent of the coating rubber is reduced, but the electrical resistance of the coating rubber increases and the conductive path from the bead portion to the tread portion is blocked
Solution Approach 1:
A conductive member extending in the tire radial direction is introduced as an intermediary element to bridge the electrical connection between the bead portion and the tread portion. This conductive member passes through the carcass ply, allowing static electricity to escape through the tread portion to the road surface even when the coating rubber has high electrical resistance due to reduced carbon content.
2Use of energy by moving object
If the amount of carbon in the coating rubber is reduced to lower rolling resistance, then fuel efficiency is improved, but static electricity dissipation to the road surface is hindered
Solution Approach 1:
The conductive member serves as a mediator that enables static electricity dissipation without requiring carbon in the coating rubber. By providing an alternative conductive path through the carcass ply, the system can maintain low fuel efficiency (reduced rolling resistance) while simultaneously preventing static electricity accumulation.
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 structure effectively dissipates static electricity to the road surface while reducing rolling resistance and controlling weight gain, using lightweight conductive fiber members to maintain fuel efficiency.
Implementation Method 1
a conductive fiber member extending in a tire radial direction from an inner side in the tire radial direction of the carcass to an outer side in the tire radial direction of the carcass
Data Source
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Figure 2
AI summary
There is disclosed a tire comprising: a tread portion, a pair of bead cores, a carcass, a reinforcement member, a bead filler and a conductive member. The pair of bead cores is embedded in a pair of bead portions. The carcass comprises one or more carcass plies, each of which consists of a carcass body portion straddling toroidally over the pair of bead cores and a carcass turn-up portions extending from the carcass body portion and folded back around the bead cores. The reinforcement member comprises one or more reinforcement layers disposed on the outer side in the tire radial direction of a crown portion of the carcass. The bead filler is disposed on the outer side in the tire radial direction of the bead core, and a rubber chafer is disposed on the outer side in the tire width direction of the bead filler. The conductive member is in electrical contact with a rubber chafer, and one or more reinforcement layers which is conductive, to form a conductive path with the rubber chafer and the one or more reinforcement layers which is conductive. The conductive member is a conductive fiber member.