Pneumatic Tire Inner Mount Structure for Sensor Vibration Damping
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Solution Overview
Problem
Vibrations transmitted from the road surface to the tire cause noise during vehicle travel due to the attachment of electric equipment such as sensors, which are not effectively attenuated by existing tire designs.
Innovation Solution
A tire design with a mount member attached to the inner surface, where the complex elastic modulus of the rubber composition of the mount member is higher than that of the inner liner, ensuring a difference of less than 2.5 MPa, allowing the inner liner to attenuate vibrations and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tire is designed for high grip performance through rigid structures and high rubber content, then braking distance and acceleration are improved, but fuel consumption increases and CO2 emissions rise
Solution Approach 1:
The tire is divided into functionally independent zones: rigid circumferential reinforcement elements provide structural stability and grip, while flexible diagonal layers provide cushioning and energy absorption. This segmentation allows each zone to optimize its properties without compromising the other, reducing overall energy loss while maintaining grip performance.
Solution Approach 2:
Different regions of the tire are assigned different mechanical properties: the circumferential reinforcement zones have high rigidity for grip, while the diagonal layers have high flexibility for energy absorption. This local differentiation allows the tire to exhibit both high grip performance and low rolling resistance simultaneously.
2Stability of the object's composition
If a tire uses rigid circumferential reinforcement to improve stability and grip, then handling is improved, but rolling resistance increases
Solution Approach 1:
The reinforcement structure is segmented into circumferential rigid elements for stability and diagonal flexible layers for rolling resistance reduction. This segmentation allows the rigid elements to provide handling stability while the flexible diagonal layers absorb rolling energy through elastic deformation.
Solution Approach 2:
The diagonal reinforcement layers are designed to dynamically deform and recover during rolling, providing energy absorption through elastic deformation. This dynamic behavior reduces rolling resistance while the circumferential rigid elements maintain handling stability.
3Reliability
If a tire incorporates complex multi-layer reinforcement structures to improve durability and grip, then performance is improved, but manufacturing complexity and costs increase
Solution Approach 1:
The tire is constructed from discrete, pre-formed reinforcement elements (circumferential layers and diagonal layers) that can be manufactured separately and then assembled. This segmentation simplifies the manufacturing process compared to forming complex multi-layer structures in a single operation, while maintaining high durability through the layered reinforcement architecture.
Data Source
Figure 1
Figure 2
Figure 3A~3B
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).