Pneumatic Tire Conductive Rubber Segmentation
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Solution Overview
Problem
Conventional pneumatic tires face challenges in achieving good rolling resistance reduction, high-speed durability, and electrical resistance reduction performance simultaneously due to the high heat build-up caused by rubber materials with low electrical resistance.
Innovation Solution
The tire design incorporates electrically conductive rubber with a lower resistance value than the rim cushion rubber and ground tread rubber, which guides electricity from the rim to the tread portion, allowing for the use of low heat build-up rubber without considering the electrical resistance of the rim cushion rubber, and increases the contact area with the belt layer for improved electrical resistance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubber material with low electrical resistance is used in the rim cushion rubber, then electrical resistance reduction performance is improved, but heat build-up increases, causing rolling resistance reduction performance and high-speed durability performance to deteriorate
Solution Approach 1:
The tire is divided into multiple rubber layers with different electrical resistance characteristics. The rim cushion rubber uses high electrical resistance material to prevent heat build-up, while the ground tread rubber uses low electrical resistance material to discharge static electricity. This segmentation allows each layer to perform its specific function without compromising overall performance.
Solution Approach 2:
Different regions of the tire are assigned different electrical resistance properties based on their specific functions. The rim cushion rubber at the bead portion uses high electrical resistance material, while the ground tread rubber at the tread surface uses low electrical resistance material. This local differentiation optimizes both electrical resistance reduction and rolling resistance performance.
2Reliability
If rubber material with low electrical resistance is used in the rim cushion rubber, then electrical resistance reduction performance is improved, but high-speed durability performance deteriorates due to high heat build-up
Solution Approach 1:
The tire structure is segmented into rim cushion rubber and ground tread rubber with different electrical resistance characteristics. The rim cushion rubber uses high electrical resistance material to minimize heat build-up and maintain high-speed durability, while the ground tread rubber handles static electricity discharge.
Solution Approach 2:
The rim cushion rubber region is specifically designed with high electrical resistance material to prevent excessive heat generation during high-speed operation, while other regions like the ground tread rubber use low electrical resistance material for electrostatic discharge.
3Reliability
If ground tread rubber with low electrical resistance is used, then electrical resistance reduction performance is improved, but rolling resistance reduction performance deteriorates due to heat build-up
Solution Approach 1:
The ground tread rubber is specifically designed with low electrical resistance material to discharge static electricity from the road surface, while the rim cushion rubber uses high electrical resistance material to minimize heat build-up and maintain rolling resistance 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
This design effectively reduces rolling resistance, enhances high-speed durability, and achieves compatible performance in rolling resistance and electrical resistance reduction, while improving steering stability on wet roads.
Implementation Method 1
an electrically conductive rubber disposed in the rim cushion rubber, the electrically conductive rubber having an electrical resistance value lower than that of the rim cushion rubber
Implementation Method 2
the rubber material with low electrical resistance has high heat build-up, so it tends to reduce rolling resistance reduction performance and high-speed durability performance
Data Source
AI summary
A pneumatic tire includes: a rim cushion rubber disposed in a bead portion where the bead portion and a rim are in contact with each other; an electrically conductive rubber disposed in the rim cushion rubber, the electrically conductive rubber having an electrical resistance value lower than that of the rim cushion rubber, and including a first end exposed on an outer surface of the rim cushion rubber in contact with the rim, and a second end disposed in contact with a tire component adjacent to the rim cushion rubber; and an ground tread rubber disposed in a tread portion passing through a cap tread rubber and an undertread rubber of the tread portion, the ground tread rubber having an electrical resistance value lower than that of the cap tread rubber.