Narrow Large-Diameter Tire Tread for High-Speed Noise Control
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Solution Overview
Problem
Existing pneumatic tires face challenges in achieving both improved noise performance at high speeds and handling performance at low temperatures.
Innovation Solution
A tire design that includes specific dimensions and an elastomer composition with a defined phase difference, where the tire outer diameter and cross-sectional width satisfy a certain relationship, and the tread portion has circumferential and axial grooves with optimized thickness and volume ratios, along with a specified elastomer composition for improved viscoelastic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rubber thickness at the groove bottom is increased to improve crack resistance, then the handling performance at low temperatures improves, but the noise performance at high speeds deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges: rubber thickness at groove bottom is 0.05 to 0.25 times the maximum tread thickness, and the elastomer composition has a phase difference δ of 5.0×10^-2π rad or less. These parameter optimizations simultaneously achieve crack resistance and noise performance without requiring increased thickness.
Solution Approach 2:
The patent uses an elastomer composition with specific viscoelastic properties (phase difference δ ≤ 5.0×10^-2π rad) combined with optimized geometric parameters. This composite approach of material property control and structural design resolves the contradiction between thickness requirements for durability and thinness requirements for noise reduction.
2Reliability
If the tread rubber thickness is increased to improve handling performance at low temperatures, then the handling performance improves, but the rolling resistance performance deteriorates
Solution Approach 1:
The patent optimizes the rubber thickness parameter to be 0.05 to 0.25 times the maximum tread thickness, and controls the phase difference of the elastomer composition to be 5.0×10^-2π rad or less. These parameter optimizations achieve handling performance improvement without increasing overall thickness, thereby maintaining acceptable rolling resistance.
3Object-affected harmful factors
If the tire is designed with optimized dimensions and elastomer composition to improve noise performance at high speeds, then the noise performance improves, but the handling performance at low temperatures deteriorates
Solution Approach 1:
The patent specifies that the elastomer composition must have a phase difference δ of 5.0×10^-2π rad or less when repeatedly deformed at 30°C and 10 Hz. This material parameter control ensures low-temperature handling performance while the geometric parameters (rubber thickness ratio) are optimized for noise performance, achieving both goals simultaneously.
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 achieves enhanced noise performance at high speeds and handling performance at low temperatures by optimizing rubber thickness, groove configurations, and elastomer composition to suppress heat generation and local deformation.
Implementation Method 1
the elastomer composition has a phase difference δ of 5.0×10−2π [rad] or less between a maximum value of strain and a maximum value of stress when repeatedly deformed at a temperature of 30 degrees Celsius and a frequency of 10 Hz in a dynamic viscoelasticity test
Data Source
AI summary
To provide a narrow and large-diameter tire capable of improving noise performance at high speeds without compromising handling performance at low temperatures.The tire has a tread portion formed of an elastomer composition. A relationship between a tire outer diameter (Dt) and a tire cross-sectional width (Wt) satisfy a following expression (1). The tread portion includes at least one circumferential groove extending in a tire circumferential direction. A rubber thickness at a groove bottom of the circumferential groove is 0.05 to 0.25 times a maximum thickness of the tread portion. The elastomer composition has a phase difference δ of 5.0×10−2π [rad] or less between a maximum value of strain and a maximum value of stress when repeatedly deformed at a temperature of 30 degrees Celsius and a frequency of 10 Hz in a dynamic viscoelasticity test;1963.4≤(Dt2×π/4)/Wt≤2827.4 (1).