Asymmetric Tire Electronic Device Placement
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Solution Overview
Problem
Asymmetric tires with installed electronic devices face challenges in high-speed endurance due to forces and deformations, particularly when the devices are positioned on the beads, sidewalls, or equator, leading to reduced performance and increased risk of detachment.
Innovation Solution
The electronic device is installed radially inside the inner rubber of the crown, positioned on the side outside the equatorial plane, with its center of gravity at least 5% and up to 25% of the maximum axial width from the equatorial plane, and located radially above a circumferential groove or plumb with a rib, optimizing the interface mixture's resistance to shear forces and reducing temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic device is installed on the bead or sidewall, then the device can be accommodated in the tire structure, but the high-speed endurance is reduced due to forces and deformations causing detachment risk
Solution Approach 1:
The patent transitions the electronic device installation from traditional locations (bead, sidewall, equatorial plane) to a new spatial dimension: radially inside the inner rubber of the crown at an axial position offset from the equatorial plane. This dimensional change places the device in a region experiencing reduced shear forces and deformations during high-speed rotation, thereby improving reliability without compromising the ability to accommodate the device.
Solution Approach 2:
The patent identifies a specific local region within the tire structure (radially inside the inner rubber of the crown, offset from the equatorial plane) that has favorable mechanical characteristics for housing electronic devices. This local region experiences lower shear forces and deformations compared to other areas, creating an optimal niche for device installation that preserves high-speed endurance.
2Adaptability or versatility
If the electronic device is positioned in the equatorial plane, then symmetry and mounting position independence are achieved, but speed resistance performance is reduced for asymmetric tires
Solution Approach 1:
The patent deliberately introduces asymmetry in the electronic device positioning by offsetting it from the equatorial plane toward one axial edge. This asymmetric placement is specifically designed to match the camber and contact area asymmetry of sports vehicles, allowing the device to be positioned in a region with favorable mechanical characteristics for high-speed performance while maintaining adaptability to asymmetric tire configurations.
3Reliability
If the electronic device is installed radially inside the inner rubber of the crown offset from the equatorial plane, then high-speed endurance is improved by reducing shear forces, but the device complexity increases
Solution Approach 1:
The patent incorporates the electronic device into the tire structure during the manufacturing process itself, rather than as a post-production addition. The device is embedded radially inside the inner rubber of the crown at the specified axial offset during tire construction, which simplifies the overall system integration and eliminates the need for complex post-manufacturing installation procedures, thereby reducing operational complexity despite the unconventional positioning.
Data Source
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AI summary
The invention aims to increase the endurance of tyres provided with an electronic device. This aim is achieved by a tyre of maximum width LT, including a tread (1) which is asymmetric according to the equatorial plane, one of the sides of which is intended for being positioned on the outside with respect to the vehicle, an inner crown lining, radially innermost on the crown, and an electronic device having at least one measurement sensor for measuring at least one parameter. Said electronic device is installed in the tyre under the crown, radially on the inside of the inner crown lining, on the side of the tread intended for being positioned on the outside with respect to the vehicle relative to the equatorial plane and such that the axial distance from the centre of gravity of the electronic device to the equatorial plane is no higher than 5 % and no lower than 25 % of the maximum axial width LT of the tyre.