Tire Tread Rubber Composition for Steering Stability at Low Rolling Resistance
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Solution Overview
Problem
Conventional tire technologies prioritize fuel efficiency over steering stability, particularly in vehicles with high vehicle height, leading to potential toppling during turning due to reduced rolling resistance.
Innovation Solution
A tire tread rubber composition with a specific hardness range (Hs 55-62 at 23°C) and loss tangent ratio (0.240≤tan δ/Hs×100≤0.320) using styrene-butadiene-based and isoprene-based rubber, combined with carbon black and silica, to enhance steering stability while maintaining good fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If rolling resistance is reduced to improve fuel efficiency, then fuel efficiency is improved, but steering stability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the hardness (Hs) within 55-62 and the loss tangent ratio (tanδ/Hs×100) within 0.240-0.320. These parameter optimizations allow the tire to achieve both low rolling resistance for fuel efficiency and appropriate stiffness for steering stability, resolving the contradiction between energy efficiency and reliability
Solution Approach 2:
The patent uses composite materials by combining styrene-butadiene-based rubber (30-80 parts by mass) with isoprene-based rubber (20-70 parts by mass), along with specific fillers like silica and carbon black. This composite rubber composition enables simultaneous achievement of low rolling resistance and high steering stability through synergistic material properties
2Reliability
If hardness is increased to improve steering stability, then steering stability is improved, but fuel efficiency deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the hardness parameter to a specific range (Hs 55-62) rather than simply increasing it. This controlled parameter change ensures sufficient steering stability while preventing excessive hardness that would increase rolling resistance and reduce fuel efficiency
Solution Approach 2:
The patent applies local quality by creating different rubber composition regions within the tire tread. The specific combination of styrene-butadiene-based rubber and isoprene-based rubber in controlled proportions creates localized material properties that balance steering stability and fuel efficiency for different functional requirements
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 composition improves steering stability during turning and normal travel while ensuring equivalent fuel efficiency, by optimizing the rubber's mechanical properties and filler content.
Implementation Method 1
the loss tangent tan δ at 35° C. and the hardness Hs at 23° C. satisfy 0.240≤tan δ/Hs×100≤0.320
Data Source
AI summary
In order to improve steering stability at the time of turning while ensuring good fuel efficiency, there is provided a tire tread rubber composition including a rubber component containing styrene-butadiene-based rubber and isoprene-based rubber, wherein the hardness Hs at 23° C. is 55 or greater and 62 or less, and the hardness Hs at 23° C. and the loss tangent tan δ at 35° C. satisfy the following formula: 0.240≤tan δ/Hs×100≤0.320. There is also provided a tire having a tread composed of this tire tread rubber composition.