Antistatic Vehicle Tire Layer Resistivity Design
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Solution Overview
Problem
Existing antistatic vehicle tires face a trade-off between antistatic properties and rolling and handling behavior, as conductive components compromise durability and other tire properties, and traditional solutions using carbon black or silica result in suboptimal performance.
Innovation Solution
A vehicle tire design featuring a poorly conducting tread layer, a moderately conducting tread base layer, and well-conducting rubber members in electrical contact with a reinforcement layer, creating multiple conducting paths to balance antistatic properties and rolling/handling behavior, with specific rubber compositions and geometries optimized for electrical resistivity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon black is used to make the tire conductive, then antistatic properties are improved, but rolling resistance increases and fuel economy deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct regions with different electrical conductivities: the tread layer uses silica (poorly conducting) to minimize rolling resistance, while the tread base layer uses carbon black (conductive) to provide antistatic properties. This spatial differentiation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The patent employs composite materials by combining silica and carbon black in different proportions across different layers. The tread layer contains silica as the primary reinforcing filler, while the tread base layer contains carbon black as the primary filler, creating a composite structure that achieves both low rolling resistance and good antistatic performance.
2Loss of energy
If silica is used as reinforcing material to decrease rolling resistance, then fuel economy is improved, but electrical conductivity deteriorates and electrical charge accumulation occurs
Solution Approach 1:
The patent segments the tire structure into functionally distinct layers: a tread layer made primarily of silica for low rolling resistance, and a tread base layer made primarily of carbon black for electrical conductivity. This segmentation allows each layer to fulfill its specific function without compromise.
Solution Approach 2:
The patent applies local quality by creating distinct regions with different electrical conductivities: the tread layer uses silica (poorly conducting) to minimize rolling resistance, while the tread base layer uses carbon black (conductive) to provide antistatic properties. This spatial differentiation allows each layer to optimize its specific function without compromising the other.
3Reliability
If conductive chimneys are created to connect the tread layer to the conductive base layer, then antistatic behavior is improved, but tire durability and strength deteriorate
Solution Approach 1:
The patent extracts the electrical conduction function from the structural load-bearing function by placing the conductive carbon black layer in the tread base layer, separate from the silica-based tread layer that contacts the ground. This separation allows the tread layer to maintain its structural integrity while the base layer provides electrical conductivity through alternative conduction paths.
Solution Approach 2:
The patent employs composite materials by combining silica and carbon black in different proportions across different layers. The tread layer contains silica as the primary filler, while the tread base layer contains carbon black as the primary filler, creating a composite structure that achieves both low rolling resistance and good antistatic 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
The tire achieves improved antistatic performance and rolling/handling behavior while maintaining durability, with multiple conducting paths ensuring reliable current conduction and optimal tire properties.
Implementation Method 1
the tread layer rubber composition having an electrical resistivity at room temperature of more than 108 ohm-cm; the tread base layer rubber composition having an electrical resistivity at room temperature of between 106 ohm-cm and 108 ohm-cm; the member rubber composition having an electrical resistivity at room temperature of less than 106 ohm-cm; and the rubber composition of at least one layer of the reinforcement package having an electrical resistivity at room temperature of less than 106 ohm-cm
Data Source
AI summary
The invention relates to a vehicle tire comprising a tread portion and a package of reinforcement layers arranged underneath the tread portion. The tread portion comprises a tread base layer arranged underneath the tread layer, and at least one rubber member that extends in the radial direction of the tire from the ground contacting surface to the reinforcement package. The tread layer rubber composition has an electrical resistivity at room temperature of more than 108 ohm-cm, the tread base layer rubber composition of between 106 ohm-cm and 108 ohm-cm, the member rubber composition of less than 106 ohm-cm; and the rubber composition of at least one layer of the reinforcement package has a electrical resistivity at room temperature of less than 106 ohm-cm. The vehicle tire combines a low rolling resistance with improved conductivity to avoid build-up of static electricity.