Polyester Band Layer Tire Structure for High-Speed Ride Comfort
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional tires face challenges in durability and ride comfort, especially during high-speed running, due to excessive deformation and heat generation, which leads to flat spots and reduced performance.
Innovation Solution
A tire design featuring a tread rubber with a glass transition temperature of -20°C or higher and a band layer with polyester fibers, where the band cords have specific stress ranges at 2.5% and 5.0% elongation, enhancing durability and ride comfort by suppressing heat-induced softening and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional band layers with organic fiber cords are used, then basic tire structure is maintained, but durability and ride comfort after high speed running are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the stress characteristics of polyester fiber cords at specific elongation points (2.5% and 5.0%). The stress at 2.5% elongation is set to 0.03-0.15 N/tex and stress at 5.0% elongation is set to 0.05-0.25 N/tex, creating optimal mechanical properties that simultaneously improve durability and ride comfort after high-speed running.
Solution Approach 2:
The patent uses composite materials by combining polyester fibers with specific rubber compositions in the band layer. The polyester fiber cords are embedded in a rubber matrix with controlled glass transition temperature, creating a composite structure that enhances both reliability and ride comfort through the synergistic properties of the fiber-reinforced rubber composite.
2Productivity
If tread rubber with low glass transition temperature is used, then ride comfort is improved, but heat generation increases during high speed running
Solution Approach 1:
The patent applies parameter changes by optimizing the glass transition temperature of the rubber composition in the band layer to be -50°C or higher. This parameter adjustment ensures the rubber maintains appropriate elasticity and damping properties for ride comfort while generating less heat during high-speed operation compared to rubbers with lower glass transition temperatures.
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 effectively absorbs impacts, reduces heat generation, and minimizes flat spots, maintaining roundness and uniform deformation, thereby improving both durability and ride comfort during high-speed running.
Implementation Method 1
the band cord has a stress at 2.5% elongation of not less than 0.05 N/tex and not greater than 0.18 N/tex and a stress at 5.0% elongation of not less than 0.09 N/tex and not greater than 0.33 N/tex
Implementation Method 2
the tread rubber contains styrene and is composed of a rubber composition having a glass transition temperature of not lower than -20°C
Data Source
Figure 1
Figure 2
AI summary
A tire 1 includes a tread portion 2 including: a tread rubber 2A forming a ground-contact surface 2a; and a band layer 8 disposed inward of the tread rubber 2A in a tire radial direction. The band layer 8 includes at least one band ply 8A in which a band cord 8a containing a polyester fiber is arranged. The band cord 8a has a stress σ1 at 2.5% elongation of not less than 0.05 N/tex and not greater than 0.18 N/tex and a stress σ2 at 5.0% elongation of not less than 0.09 N/tex and not greater than 0.33 N/tex. The tread rubber 2A contains styrene and is composed of a rubber composition having a glass transition temperature Tg of not lower than - 20°C. A styrene amount S in 100 parts by mass of a rubber component of the tread rubber 2A is not greater than 25 parts by mass.