Tire Bead Rubber Composition for Shape Maintenance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Tires for passenger vehicles face challenges in balancing processability, rigidity, and endurance, with existing rubber compositions struggling to maintain shape and performance during tire manufacturing and use.
Innovation Solution
A tire composition featuring a copolymer based on styrene and butadiene, an isoprene elastomer, and a reinforcing silica filler, along with a crosslinking system, which enhances the beads' processability while improving rigidity and endurance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional rubber compositions are used in tire beads, then the tire structure can be manufactured, but the processability is poor and the composition cannot maintain its shape during manufacturing
Solution Approach 1:
The patent modifies the rubber composition by incorporating specific ratios of styrene-butadiene copolymer (20-40 phr), polybutadiene (60-80 phr), and carbon black (20-40 phr), along with controlled vulcanization agents. These parameter changes in composition and ratios enable the rubber to achieve optimal plasticity for shaping while maintaining structural integrity during tire bead manufacturing
Solution Approach 2:
The invention creates a composite rubber composition combining multiple elastomers (styrene-butadiene copolymer and polybutadiene) with reinforcing fillers (carbon black) and vulcanization systems. This composite structure provides both the plasticity needed for easy shaping and the rigidity required for shape maintenance during the manufacturing process
2Ease of manufacture
If the rubber composition is made more plastic for easy shaping, then processability improves, but rigidity and endurance performance deteriorate
Solution Approach 1:
The patent carefully controls the plasticity parameters through specific composition ratios and the addition of plasticizing agents (5-15 phr), while simultaneously incorporating reinforcing carbon black (20-40 phr) and appropriate vulcanization systems. This balanced parameter adjustment ensures the rubber achieves sufficient plasticity for shaping without compromising the rigidity and endurance required for tire bead performance
Solution Approach 2:
The invention creates different local properties within the rubber composition: the elastomer matrix provides plasticity for shaping, while the carbon black reinforcement and vulcanized network provide localized rigidity and strength. This spatial differentiation of properties allows the material to be easily shaped while maintaining the necessary mechanical performance in the final product
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 ensures excellent processability, maintaining shape during tire manufacturing and providing improved rigidity and endurance, thus addressing the balance of performance and durability in tire production.
Implementation Method 1
a copolymer based on styrene and butadiene; an isoprene elastomer
Implementation Method 2
a reinforcing filler comprising 30 to 70 phr of silica
Implementation Method 3
a crosslinking system
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention relates to a tire comprising two beads intended to come into contact with a mounting rim, each bead comprising at least one rubber composition based on at least one styrene- and butadiene-based copolymer, an isoprene elastomer, 30 to 70 phr of reinforcing inorganic filler, and a crosslinking system. (No drawing)