Tire Electronic Device Bead Mounting for Puncture Reliability
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Solution Overview
Problem
Tires with electronic devices mounted on the inner surface are prone to breakage or disengagement when the sidewall is deformed due to punctures or abnormal pressure changes, especially in construction equipment and truck/bus tires, where the electronic device is interposed between the inner surfaces of the sidewall, leading to potential breakage or disengagement.
Innovation Solution
The electronic device is positioned on the inner side of the bead portion, away from the rim contact surface, using a fixing member that securely attaches it to the tire, preventing collision with the inner surface during deformation and maintaining attachment even under puncture or pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the electronic device is mounted on the inner surface of the sidewall portion, then the device can be appropriately replaced, but the device may break or disengage when the sidewall is deformed due to puncture or abnormal pressure decrease
Solution Approach 1:
The electronic device is extracted from the sidewall portion and relocated to the bead portion, which is a different structural zone of the tire. This extraction from the deformation-prone sidewall area eliminates the risk of breakage during puncture events while preserving the device's replaceability through the same mounting mechanisms available in the bead portion.
Solution Approach 2:
The mounting location transitions from the radial dimension (sidewall) to the axial dimension (bead portion near rim). This dimensional shift places the electronic device in a region that experiences different deformation characteristics during puncture, specifically avoiding the bending and contact between inner surfaces that occurs in the sidewall area.
2Stability of the object's composition
If the sidewall portion is allowed to deform naturally during puncture, then the tire structure remains flexible, but the electronic device interposed between inner surfaces suffers breakage or disengagement
Solution Approach 1:
The electronic device is extracted from the harmful zone (sidewall inner surface) where deformation causes inner surface contact. By relocating it to the bead portion, the device is removed from the deformation path while the tire's sidewall maintains its natural flexibility and structural composition for normal operation.
Solution Approach 2:
The bead portion serves as an intermediary location that is structurally connected to the tire but spatially separated from the deformation zone. This intermediary position allows the sidewall to deform naturally during puncture while the electronic device mounted on the bead portion remains protected from the harmful effects of inner surface contact.
Data Source
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Figure 3
AI summary
In a cross section of this tire (1) orthogonal to the tire circumferential direction and running along the tread width direction, an end (7b) that is outside in the tire diameter direction of an electronic device (7) is located farther inward in the tire diameter direction than a reference position that is located outward in the tire diameter direction away from an outer rim end portion (2b), the outer rim end portion being located on the outside in the tire diameter direction of a rim contact surface, and the distance between the outer rim end portion and the reference position being equal to the thickness (T1) of a bead portion in the outer rim end portion.