Base Tread Rubber Composition Balancing Rolling Resistance and Noise
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Solution Overview
Problem
Existing rubber compositions for tire base treads improve rolling resistance but deteriorate pass-by noise, or vice versa, making it difficult to achieve a balance between both properties.
Innovation Solution
A rubber composition for tire base treads with a tanδ ratio of 0 °C to 30 °C (0 °C tanδ/30 °C tanδ) of 2.90 or more, comprising styrene-butadiene rubber with a styrene content of 26 mass% or more, natural rubber, and butadiene rubber, along with specific ratios of these components, to enhance rolling resistance and reduce pass-by noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the tanδ of the rubber composition is kept low to improve rolling resistance and fuel efficiency, then rolling resistance is reduced, but pass-by noise deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the tanδ ratio at different temperatures (0°C tanδ/30°C tanδ ≥ 2.90) rather than simply minimizing tanδ at all temperatures. This temperature-dependent parameter control allows the rubber composition to exhibit different damping characteristics at low temperatures (reducing noise) versus high temperatures (reducing rolling resistance), thereby resolving the contradiction between noise reduction and rolling resistance improvement
Solution Approach 2:
The patent uses a composite rubber composition containing multiple rubber components (styrene-butadiene rubber with 26 mass% or more styrene content, natural rubber, and butadiene rubber) in specific proportions. This composite structure enables the material to combine the low-temperature noise reduction properties of certain rubber types with the high-temperature rolling resistance properties of others, achieving both objectives simultaneously
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 achieves improved rolling resistance and reduced pass-by noise when applied to tires, balancing both properties effectively.
Implementation Method 1
a ratio of tanδ at 0 °C to tanδ at 30 °C (0 °C tanδ/30 °C tanδ) is 2.90 or more
Data Source
AI summary
Provide is a rubber composition for base tread which is excellent in rolling resistance properties and can improve pass-by noise when applying the rubber composition for base tread to a tire. Disclosed is a rubber composition for base tread used for a base tread of a tread portion of a tire, where a ratio of tanδ at 0 °C (0 °C tanδ) to tanδ at 30 °C (30 °C tanδ) (0 °C tanδ/30 °C tanδ) is 2.90 or more.