Tire Sensor Adhesive Layer for Strain Measurement
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Solution Overview
Problem
Conventional tire sensors face challenges in achieving long-term durability and accurate strain measurement due to inadequate adhesive performance and durability, particularly when subjected to the fluctuating strains experienced during vehicle travel.
Innovation Solution
The use of a room temperature moisture cure type adhesive, such as acrylic modified silicone resin or epoxy modified silicone resin, with an elastic modulus between 0.1 to 100 Mpa and a loss coefficient less than 0.1, to form an adhesive layer between the tire's rubber member and the sensor, ensuring high adhesion strength and precise deformation transmission, along with a reinforcement member for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cyanoacrylate quick-drying adhesive is used to stick the sensor to the rubber member, then the adhesive layer is thin and working property is excellent, but sufficient initial adhesive performance and adhesive durability cannot be obtained
Solution Approach 1:
The patent changes the key parameter of adhesive type from cyanoacrylate quick-drying adhesive to room temperature moisture cure type adhesive. This parameter change enables the adhesive to achieve both good working properties during application and sufficient adhesive durability after curing, resolving the contradiction between ease of manufacture and reliability.
2Device complexity
If the sensor is directly adhered to the rubber member with conventional adhesive, then the structure is simple, but the sensor durability is insufficient under tire strain fluctuations
Solution Approach 1:
The patent employs composite material strategy by combining room temperature moisture cure type adhesive with elastic modulus in specific range (10^6 to 10^9 dyne/cm²) and tan δ less than 0.1. This composite approach creates an adhesive layer that provides both structural simplicity and enhanced sensor durability under tire strain fluctuations.
3Measurement precision
If a thin adhesive layer is used to transmit deformation accurately, then measurement precision is improved, but adhesive durability deteriorates
Solution Approach 1:
The patent optimizes the parameter combination of adhesive thickness and material properties (elastic modulus and tan δ). By selecting room temperature moisture cure type adhesive with specific elastic modulus range and low tan δ value, the system achieves both accurate deformation transmission and adhesive durability simultaneously.
Solution Approach 2:
The use of composite material characteristics in the room temperature moisture cure type adhesive allows the thin adhesive layer to maintain both measurement precision through effective deformation transmission and adhesive durability through optimized material composition and properties.
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 solution enables accurate transmission of tire deformation to the sensor, significantly improving the durability and reliability of tire strain measurement, even under large and high-frequency inputs, while maintaining adhesive integrity over extended periods.
Implementation Method 1
an elastic modulus of the adhesive layer is in the range of 0.1 to 100 Mpa
Implementation Method 2
tan δ is less than 0.1
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3(a)~3(b)
AI summary
This invention provides a tire (10) equipped with a sensor (14), attached to a rubber member (15) in the surface of the tire (10), for detecting deformation of the tire (10). The sensor (14) is adhered to the rubber member (15) with the aid of an elastic adhesive formed of a room-temperature moisture cure adhesive agent composed mainly of an acryl modified silicone resin or the like. The adhesive between the sensor (14) and the rubber member (15) is cured to form an elastic adhesive layer (16). According to the above constitution, the deformation of the rubber member (15) in the tire surface can be transmitted to the sensor (14) with high accuracy, and, at the same time, the durability of the sensor (14) can be improved.