Adhesive Fastening of Magnetic Guide to PCB in Power Steering
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Solution Overview
Problem
The existing methods for fastening a magnetic guide to a printed circuit board in power steering systems are cumbersome, requiring orifices that consume space, time-consuming welding operations, and can cause overheating, which damages the electronic circuit.
Innovation Solution
A magnetic guide is adhesively fastened to a printed circuit board using pads and fastening tabs with adhesive, eliminating the need for welding and providing a stronger bond without overheating, allowing isostatic mounting and optimized adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding operations are used to fasten the magnetic guide to the printed circuit board, then strong bonding is achieved, but overheating occurs that damages the electronic circuit
Solution Approach 1:
The patent replaces the welding process (thermal-mechanical system) with an adhesive bonding process (chemical-mechanical system). The adhesive is applied to the fastening tabs of the magnetic guide and bonds to the printed circuit board without generating significant heat, thereby eliminating the overheating problem while maintaining bonding strength.
Solution Approach 2:
The patent changes the bonding mechanism from thermal (welding) to chemical (adhesive bonding). This parameter change in the bonding process eliminates the high temperature exposure that damages electronic circuits while achieving sufficient mechanical strength through adhesive chemistry.
2Reliability
If orifices are provided in the printed circuit board for fastening the magnetic guide, then secure mounting is achieved, but space is consumed and the board becomes bulky
Solution Approach 1:
The patent transitions from a 2D surface mounting approach (requiring large surface orifices) to a 3D volumetric approach by applying adhesive to the fastening tabs. The adhesive fills the space around the tabs and bonds to the board, utilizing the third dimension (depth/thickness) to achieve secure mounting without consuming valuable surface area.
3Strength
If welding operations are performed to fasten the magnetic guide, then strong bonding is achieved, but the process becomes time-consuming and expensive
Solution Approach 1:
The patent replaces the complex welding process (requiring specialized equipment, skilled operators, and multiple steps) with a simpler adhesive bonding process. The adhesive can be applied using automated dispensing systems, eliminating the need for welding equipment and reducing manufacturing complexity, time, and cost while maintaining bonding strength.
4Ease of manufacture
If adhesive is applied directly to the base substrate, then fastening is achieved, but adhesion strength is insufficient compared to metal-to-metal bonding
Solution Approach 1:
The patent applies adhesive specifically to the fastening tabs (metal components) rather than directly to the base substrate. The fastening tabs are made of metal material that provides superior adhesion properties for the adhesive, creating strong localized bonding zones at the interface between the magnetic guide and the board, while maintaining the simplicity of adhesive application.
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
This solution simplifies the fastening process, reduces space requirements, prevents overheating, and enhances the reliability of the magnetic field detection in power steering systems by ensuring a strong and efficient adhesive bond between the magnetic guide and the printed circuit board.
Implementation Method 1
each fastening tab is joined to the pad of the corresponding fastening area by way of an adhesive that is applied in its fastening orifice
Implementation Method 2
a magnetic guide comprising at least two fastening tabs for fastening to the printed circuit board, mounted around said magnetic sensor in order to channel said magnetic field
Data Source
AI summary
Disclosed is an electronic device for determining the angular position of a shaft of a motor vehicle, the device including a printed circuit board and a magnetic guide including at least two fastening tabs for fastening to the printed circuit board, the printed circuit board including a base substrate and at least two fastening areas for fastening the magnetic guide, each designed to receive a fastening tab of the magnetic guide, the fastening tab defining a fastening orifice. Each fastening area is defined on the base substrate of the printed circuit board and includes a pad fastened to the base substrate. Each fastening tab is joined to the pad of the corresponding fastening area by way of an adhesive that is applied in its fastening orifice.