Pneumatic Tire Sensor Mount Modulus Layout for Noise Suppression
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Solution Overview
Problem
Conventional tire pressure monitoring systems generate noise due to vibrations transmitted from the road to the tire, which are amplified by the attachment of electric equipment, leading to unpleasant sounds during vehicle travel, especially at high speeds.
Innovation Solution
A tire design with a mount member and inner liner where the complex elastic modulus of the mount member's rubber composition is higher than that of the inner liner's, allowing the inner liner to attenuate vibrations and reduce noise by being softer and more viscoelastic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electric equipment is attached to the tire inner surface to detect tire information, then measurement precision is improved, but object-generated harmful factors worsen due to vibration and noise generation
Solution Approach 1:
The mount member serves as an intermediary between the tire inner surface and the electric equipment. It is composed of a rubber composition with higher complex elastic modulus than the inner liner, allowing it to rigidly support the sensor while the softer inner liner absorbs vibrations, preventing them from reaching the sensor and causing noise
Solution Approach 2:
The invention uses composite material structure with two different rubber compositions: the inner liner made of softer rubber (lower complex elastic modulus) for vibration absorption, and the mount member made of harder rubber (higher complex elastic modulus) for stable sensor mounting. This composite approach allows both vibration attenuation and precise measurement
2Object-generated harmful factors
If the inner liner is made softer to attenuate vibrations, then object-generated harmful factors are reduced, but strength decreases
Solution Approach 1:
The invention changes the physical parameter of complex elastic modulus to differentiate between the inner liner and mount member. The inner liner uses rubber composition with lower complex elastic modulus for vibration absorption, while the mount member uses rubber composition with higher complex elastic modulus to maintain strength and provide stable sensor mounting
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
This configuration effectively restricts noise generation during vehicle travel by attenuating vibrations, improving vehicle running stability and reducing unwanted sounds, particularly at high speeds.
Implementation Method 1
the inner liner can be a viscoelastic material that is softer than the mount member. With this configuration, in the tire including the mount member to which the electric equipment is attached, a vibration transmitted from the tread portion to the mount member and the electric equipment during travelling of a vehicle is attenuated by the inner liner
Implementation Method 2
a vibration transmitted from the mount member and the electric equipment to the tread portion is attenuated by the inner liner
Data Source
AI summary
A pneumatic tire (1) includes: a tread portion (2) including a land portion (24) divided by a plurality of main grooves (22) formed on a tread surface (21); an inner liner (7) constituting a tire inner surface (7A) on an inner side of the tread portion (2); and a mount member (10) which is provided on the tire inner surface (7A), and to which electric equipment can be attached. In the pneumatic tire (1), Complex elastic modulus E*1 of a rubber composition constituting the mount member (10) is larger than complex elastic modulus E*2 of a rubber composition constituting the inner liner (7).