Tyre Sensor Antenna Housing to Prevent Wire Breakage
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Solution Overview
Problem
Existing tire pressure measuring devices suffer from antenna breakage due to concentrated stresses at the rigid connection with the electronic board, risking operational failure and tire damage.
Innovation Solution
A tire pressure measuring device with an electronic circuit protected by a housing and flexible antenna strands, featuring a lateral projection to distribute stress and a protective elastomer envelope to reduce deformation and enhance endurance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna is rigidly connected to the electronic board, then the electrical connection is stable, but the antenna is prone to breakage under stress and deformation
Solution Approach 1:
The patent changes the physical state and mechanical properties of the antenna by transforming it from a rigid structure to a flexible helical strand. This parameter change allows the antenna to deform elastically under stress while maintaining electrical connectivity, resolving the contradiction between connection stability and breakage resistance
Solution Approach 2:
The antenna is designed as a flexible helical strand that can dynamically adapt its shape in response to mechanical stresses and deformations during tire rotation. This dynamic flexibility allows the antenna to absorb stresses that would otherwise cause breakage in a rigid connection, while the galvanic connection at the base maintains electrical stability
2Duration of action of stationary object
If the antenna is made flexible to resist stress, then the endurance improves, but the galvanic connection at the end may become loose or break
Solution Approach 1:
The patent applies local quality by making only the distal portion of the antenna flexible through a helical strand structure, while maintaining a rigid galvanic connection at the base where it attaches to the electronic board. This localized flexibility ensures endurance during tire rotation while preserving connection reliability at the critical attachment point
Solution Approach 2:
The antenna is segmented into a flexible helical strand portion and a rigid connection portion. This segmentation allows different parts of the antenna to have different mechanical properties - the helical strand absorbs deformation stresses to improve endurance, while the rigid base maintains reliable galvanic connection
Data Source
Figure 1A~1B
Figure 1C~3
Figure 4
AI summary
The invention relates to a device for measuring an operating variable, to be fitted onto a tyre, comprising: - an electronic circuit distributed over a first face of an electronic board and comprising a sensor; - a protective housing at least partially covering the electronic circuit; and - at least one first antenna wire having one end galvanically connected to the electronic circuit and integrally extending so as to project laterally from the housing. According to the invention, the housing comprises a lateral portion which projects substantially tangentially to a proximal end portion of the first wire in accordance with a generatrix of said first wire.