Tire Sidewall Rubber Compound for Low-Temperature Rolling Resistance
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Solution Overview
Problem
Existing rubber compounds for vehicle tire sidewalls do not adequately address the impact of low ambient temperatures on rolling resistance, as current correction formulas are limited to a 20°C to 30°C range and do not account for individual tire characteristics, leading to increased energy consumption and reduced performance at lower temperatures.
Innovation Solution
A rubber compound for vehicle tire sidewalls comprising a high proportion of low-cis butadiene rubber and low surface area carbon black, along with specific additives, to enhance rolling resistance and reduce temperature sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional rubber compounds are used in sidewalls, then the tires maintain acceptable performance at standard temperatures (20°C to 30°C), but the rolling resistance increases significantly at low ambient temperatures below 0°C
Solution Approach 1:
The patent modifies the rubber compound composition by adjusting the proportions of specific rubber components (natural rubber, polybutadiene, styrene-butadiene rubber) and filler materials (carbon black, silica) to change the viscoelastic parameters of the sidewall material, thereby reducing its sensitivity to temperature variations and maintaining low rolling resistance at low temperatures
Solution Approach 2:
The patent uses a composite rubber compound formulation combining multiple rubber types (natural rubber, polybutadiene, styrene-butadiene rubber) with specific filler materials (carbon black, silica) in optimized proportions to create a material with improved temperature-dependent rolling resistance characteristics
2Loss of energy
If the rubber compound formulation is optimized for low rolling resistance at standard temperatures, then energy efficiency is improved, but the compound's performance and durability at low temperatures deteriorates
Solution Approach 1:
The patent changes the compositional parameters of the rubber compound by specifying precise proportions of different rubber types and filler materials to achieve a balance that maintains both low rolling resistance (reduced energy loss) and reliable performance across a wide temperature range including low temperatures
3Device complexity
If existing correction formulas are used to estimate rolling resistance at different temperatures, then calculations are simplified, but the precision and accuracy of predictions for specific tire characteristics are reduced
Solution Approach 1:
The patent introduces specific compositional parameters (ratios of different rubber types and filler materials) that can be used to adjust and refine rolling resistance predictions, allowing for more accurate calculations that account for individual tire characteristics while maintaining a practical computational approach
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 compound significantly improves rolling resistance and reduces temperature sensitivity, especially at low ambient temperatures, thereby enhancing tire performance and reducing energy consumption.
Implementation Method 1
The rubber compound, vulcanizate, sidewall and vehicle tire according to the invention achieve a particularly high improvement in rolling resistance, especially at low ambient temperatures
Data Source
Figure 1
AI summary
The invention relates to a vehicle tire which contains at least in one sidewall (4) a vulcanizate obtained by sulfur vulcanization of a rubber compound which contains at least the following components: a) at least 55 phr of at least one butadiene rubber, b) 20 to 50 phr of at least one carbon black as filler, wherein the carbon black preferably has a low average BET surface area of a maximum of 25 to 45 m²/g.