Two-Layer Tread Rubber Composition for High-Speed Ride Comfort
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Solution Overview
Problem
Existing tires fail to provide adequate ride comfort during high-speed running, particularly on expressways where vehicles travel at high speeds, due to insufficient shock absorption and vibration damping.
Innovation Solution
A tire design comprising a tread part with two layers, where each layer is composed of a rubber composition containing recovered carbon black, with a specific ratio of carbon black content and thickness, and adjusted elastic modulus and hardness to enhance shock absorption and vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer tread structure is used, then the tire structure is simple and manufacturing is easier, but ride comfort during high-speed running is insufficient due to inadequate shock absorption
Solution Approach 1:
The tread part is divided into two distinct layers: a first layer (tread surface layer) and a second layer (inner layer adjacent to the first layer). This segmentation allows each layer to have optimized properties for different functions, with the second layer having higher recovered carbon black content for superior shock absorption and vibration damping capabilities, thereby improving ride comfort during high-speed running while maintaining reasonable structural complexity
2Reliability
If the recovered carbon black content is increased to improve shock absorption, then ride comfort improves, but heat generation increases
Solution Approach 1:
The recovered carbon black content is distributed non-uniformly across the tread layers, with the second layer (inner layer) having a higher content (B) than the first layer (surface layer) (B/C > 1.0). This local quality differentiation allows the inner layer to provide superior shock absorption where it is most needed, while the surface layer maintains lower carbon black content to reduce heat generation during high-speed running, thus resolving the contradiction between shock absorption and heat generation
3Reliability
If a two-layer structure with differentiated carbon black content is used, then ride comfort is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies a quantitative parameter relationship (B/C > 1.0, where B is the recovered carbon black content in the second layer and C is the content in the first layer) to define the optimal composition range. This parameter-based approach provides clear manufacturing targets and quality control criteria, making it easier to control the carbon black content ratio during production while achieving the desired ride comfort improvement during high-speed running
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 design improves ride comfort during high-speed running by effectively absorbing shocks and vibrations, maintaining optimal temperature and rigidity balance, and reducing heat generation, thereby enhancing overall performance.
Implementation Method 1
a long-distance travel at a high speed has not been uncommon, and an improvement of ride comfort during high-speed running has been particularly required
Implementation Method 2
it becomes easy for microscopic friction to occur between the surface of the recovered carbon black and rubber molecular chains when vibration occurs in the tread part
Implementation Method 3
as it is considered that a surface of a recovered carbon black becomes less active during production of the recovered carbon black as compared with a normal carbon black, it becomes easy for microscopic friction to occur between the surface of the recovered carbon black and rubber molecular chains when vibration occurs in the tread part
Implementation Method 4
microscopic friction to occur between the surface of the recovered carbon black and rubber molecular chains when vibration occurs in the tread part
Implementation Method 5
a state where the rubber components bind to the recovered carbon black is achieved due to physical adsorption of the recovered carbon black
Data Source
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AI summary
It is an object of the present invention to provide a tire with improved ride comfort during high-speed running. Provided is a tire comprising a tread part, wherein the tread part comprises a first layer constituting a tread surface, and a second layer adjacent to an inner side of the first layer in a tire radial direction, wherein each of the first layer and the second layer is composed of a rubber composition comprising a rubber component and a recovered carbon black, and wherein B/C is greater than 1.0, where a content of the recovered carbon black based on 100 parts by mass of a rubber component of a rubber composition constituting the first layer is referred to as C, in parts by mass, and a content of the recovered carbon black based on 100 parts by mass of a rubber component of a rubber composition constituting the second layer is referred to as B, in parts by mass.