Tread Rubber Composition for Tire Chipping Resistance
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Solution Overview
Problem
Tires suffer from chipping, a phenomenon where the rubber tread peels off due to stress concentration from road contact, leading to reduced durability and performance.
Innovation Solution
A tire design featuring a tread part with multiple rubber layers, comprising a rubber composition with 20% or more styrene-butadiene rubber and isoprene-based rubber, reinforced with carbon black and silica, where the glass transition temperature and layer thickness satisfy a specific inequality, enhancing stress distribution and movement ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the tread rubber layer is made thinner to reduce weight and improve fuel efficiency, then the tire becomes more fuel-efficient, but the chipping resistance deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the rubber layer by specifying a glass transition temperature range (-55°C to -70°C) and specific rubber component ratios (20-80% styrene-butadiene rubber, 20-80% isoprene-based rubber). This allows the rubber to maintain optimal mechanical properties and chipping resistance even at reduced thickness, enabling thinner tread designs that improve fuel efficiency without sacrificing durability.
Solution Approach 2:
The invention uses a composite rubber system combining two different rubber types (styrene-butadiene rubber and isoprene-based rubber) with complementary properties. This composite material approach creates a tread layer that achieves both the flexibility needed for thin designs and the strength required for chipping resistance, resolving the contradiction between reduced thickness and improved reliability.
2Reliability
If the rubber composition is optimized for chipping resistance, then the chipping resistance improves, but the manufacturing complexity increases
Solution Approach 1:
The invention establishes specific parameter ranges for rubber composition (20-80% styrene-butadiene rubber, 20-80% isoprene-based rubber) and glass transition temperature (-55°C to -70°C) that balance chipping resistance with manufacturing feasibility. These defined parameters provide clear manufacturing targets while achieving the desired reliability improvement.
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 exhibits improved chipping resistance and durability, suitable for both passenger cars and heavy-duty vehicles, with enhanced stress distribution and movement ease due to the specific rubber composition and layer structure.
Implementation Method 1
stress concentration due to an input from a road surface is mitigated by a phase separation structure formed by the SBR and the IR-based rubber
Implementation Method 2
the resin component forms a domain in at least one phase of the SBR and the IR-based rubber, whereby stress concentration is mitigated
Implementation Method 3
the filler comprises carbon black
Data Source
Figure 1
AI summary
It is an object of the present invention to provide a tire with improved chipping resistance. Provided is a tire comprising a tread part that comprises at least one rubber layer, wherein the rubber layer constitutes a tread surface, wherein the rubber layer is composed of a rubber composition comprising a rubber component, a filler, and a resin component, wherein the rubber component comprises 20% by mass or more of a styrene-butadiene rubber, and an isoprene-based rubber, wherein the filler comprises carbon black, and wherein T and G satisfy the following inequality (1), 2G−T≥70 (provided that T is lower than -50), where a glass transition temperature, in °C, of the styrene-butadiene rubber is referred to as T and a thickness, in mm, of the rubber layer is referred to as G.