Wheel Sensor Button Cell Spring Retention Under High Acceleration
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Solution Overview
Problem
Existing wheel sensors in motor vehicles face issues with battery replacement due to welded power supply, complicating recycling and necessitating entire sensor disposal.
Innovation Solution
A button cell is used with a conductive curved wire spring to provide power to the sensor, allowing easy replacement and secure holding during high accelerations, using a casing with an upper and lower part and a method for assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply battery is welded to the printed circuit board, then the sensor can withstand high accelerations reliably, but the battery cannot be replaced when discharged and the entire sensor must be discarded
Solution Approach 1:
The power supply system is segmented into a replaceable button cell battery and a non-replaceable printed circuit board assembly. The button cell is held by a spring contact that provides both electrical connection and mechanical retention, allowing the battery to be independently replaced without replacing the entire sensor or using permanent welding connections.
2Ease of repair
If a simple spring contact is used to hold the button cell, then the battery can be easily replaced, but the sensor may not withstand high accelerations of several hundred g
Solution Approach 1:
The spring contact provides a dynamic retention mechanism that adapts to acceleration forces. The spring's elastic properties allow it to maintain secure contact with the button cell during high acceleration events while still permitting easy manual replacement of the battery when the sensor is stationary or handled gently.
3Reliability
If the button cell is held firmly to withstand high accelerations, then the power supply remains reliable, but the button cell becomes difficult to remove for replacement
Solution Approach 1:
The spring contact creates a dynamic holding force that is strong during operation (withstanding accelerations of several hundred g) but allows for easy release during maintenance. The spring's elastic nature enables firm retention under load while permitting simple removal when the retaining structure is opened or the spring is decompressed.
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
Enables simple, reliable, and effective power supply to wheel sensors with removable button cells, ensuring durability and ease of battery replacement.
Implementation Method 1
a second curved portion of each branch is in contact with an electrically conductive bearing zone of the printed circuit board so as to conduct the electric current between one of the terminals of the button cell
Implementation Method 2
compress the wire spring when the upper part and the lower part of the casing are assembled with each other and the printed circuit board is placed on the wire spring
Data Source
AI summary
A sensor for a wheel of a motor vehicle. The sensor being configured to be mounted on the rim of the wheel through a valve orifice and includes an electrically conductive curved wire spring mounted in the lower part of the casing of the sensor and configured to hold a button cell in the lower part of the casing.