Tire Sensor Mounting With Selective Adhesive for High-Speed Fixation
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Solution Overview
Problem
Monitoring devices attached to tires experience detachment and damage at high speeds due to uneven radial acceleration and adhesive failure, leading to localized stress and temperature issues.
Innovation Solution
A spatially selective adhesive application method is used, where a portion of the coupling surface is free of adhesive, reducing radial stretching and compression cycles and preventing adhesive migration, ensuring stable adhesion at high speeds without excessive temperature increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied uniformly across the entire coupling surface, then initial adhesion strength is improved, but adhesive migration and detachment occur at high speeds due to radial force concentration
Solution Approach 1:
The patent applies adhesive only in a peripheral annular region of the coupling surface, leaving the central region free of adhesive. This local differentiation allows the peripheral adhesive to bear the radial forces while the central region accommodates the electronic unit without excessive stress concentration, preventing adhesive migration and detachment at high speeds.
Solution Approach 2:
The coupling surface is segmented into two functional zones: a peripheral adhesive region and a central non-adhesive region. This segmentation separates the load-bearing function (peripheral adhesive) from the housing function (central electronic unit area), allowing each zone to optimize its performance independently under high-speed radial acceleration.
2Reliability
If adhesive layer thickness is increased to prevent detachment, then adhesion reliability is improved, but temperature increase and adhesive migration worsen
Solution Approach 1:
By concentrating the adhesive in a peripheral region rather than distributing it uniformly, the patent reduces the total volume of adhesive material. This local concentration strategy maintains attachment reliability in the high-stress peripheral zone while minimizing overall adhesive temperature increase and migration throughout the coupling surface.
3Adaptability or versatility
If monitoring device mass is concentrated in the central portion, then device functionality is improved, but radial force imbalance and adhesive stress increase
Solution Approach 1:
The patent creates a local quality differentiation where the central region houses the electronic unit (mass concentration for functionality) while the peripheral region provides adhesive attachment (force bearing). This spatial separation allows the central mass concentration to serve functional purposes without creating excessive adhesive stress, as the peripheral adhesive zone is positioned to optimally resist radial forces.
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 method allows monitoring devices to maintain firm fixation to the tire at maximum homologation speeds without detachment or excessive temperature, delaying failure due to overheating and extending the lifespan of the sensor and tire.
Implementation Method 1
A first region of said coupling surface is covered by said adhesive and a second region of said coupling surface, complementary to said first region, is free of adhesive.
Data Source
AI summary
Tyre (10) comprising a monitoring device (1) which comprises a housing portion (2) and a base portion (3), the base portion (3) having a coupling surface (4) in single piece intended for fixing the monitoring device to the tyre, wherein the monitoring device (1) comprises an electronic unit (8) housed in the housing portion (2), wherein the monitoring device (1) is fixed to an inner surface (15) of the tyre (10) at a crown portion (16) of the tyre by an adhesive (6) interposed between the coupling surface (4) and the inner surface (15), wherein a first region (12) of the coupling surface (4) is covered by the adhesive (6) and a second region (13) of the coupling surface (4), complementary to the first region (12), is free of adhesive (6), and wherein the second region (13) is contained within a projection (5) of the housing portion (2) onto the coupling surface (4).