Rubber Tread Composition for High-Load Fuel-Efficient Tires
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Solution Overview
Problem
Existing tires face limitations in improving comfortability and fuel efficiency, particularly under high-load conditions, as reducing tire cross-sectional width alone is insufficient, and there is a need for enhanced performance in vehicles with increased load capacity.
Innovation Solution
A tire design with a tire outer diameter of 600 mm or less, utilizing a rubber composition that includes specific parameters such as tire cross-sectional width, tan δ at 30°C, total styrene amount, and isoprene-based rubber content, along with fillers like silica, to optimize fuel efficiency during high-load running.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If tire cross-sectional width is reduced to improve comfortability, then vehicle space is improved, but fuel efficiency under high-load conditions deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber material by controlling the styrene content (10-30%) and isoprene-based rubber content (25% or less) to optimize the tan δ at 30°C, thereby improving fuel efficiency under high-load conditions while maintaining acceptable comfortability
Solution Approach 2:
The patent uses a composite rubber composition combining styrene-butadiene rubber with isoprene-based rubber and specific fillers (silica, carbon black) to achieve optimal balance between comfortability and fuel efficiency, where the composite material properties are tuned through controlled composition ratios
2Volume of moving object
If tire cross-sectional width is reduced to improve comfortability, then wheelhouse space is optimized, but heat generation under high-load conditions increases
Solution Approach 1:
The patent controls the tan δ at 30°C within a specific range (0.08-0.15) by adjusting rubber composition parameters, which directly reduces heat generation during high-load operation while maintaining compact tire dimensions for optimized wheelhouse space
3Use of energy by moving object
If rubber composition is modified to improve fuel efficiency, then energy consumption is reduced, but tire deformation control becomes more difficult
Solution Approach 1:
The patent optimizes the rubber composition by controlling styrene content (10-30%) and isoprene-based rubber content (25% or less) to achieve a tan δ at 30°C of 0.08-0.15, which reduces energy consumption while the filler system (silica, carbon black) maintains structural stability and deformation control
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 design effectively suppresses heat generation and deformation, leading to improved fuel efficiency and comfortability by balancing tire dimensions and composition, enhancing performance under high-load conditions.
Implementation Method 1
a tan δ at 30°C (30°C tan δ) of the rubber composition satisfy the following inequality (1)
Data Source
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AI summary
It is an object of the present invention to provide a tire having improved fuel efficiency during high-load running. Provided is a tire comprising a tread part, wherein a tire outer diameter Dt is 600 mm or less, wherein the tread part is composed of a rubber composition comprising a rubber component and a filler, and wherein a tire cross-sectional width Wt, in mm, and a tan δ at 30°C (30°C tan δ) of the rubber composition satisfy the following inequality (1): 30°Ctanδ≦−7.84×10−5×Wt−1952+0.175