Circuit Board Fixing Structure for Electronic Control Device
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Solution Overview
Problem
Existing electronic control devices for internal combustion engines lack a reliable mechanism to prevent circuit boards from falling off due to mechanical external forces, leading to device malfunction and inability to operate the engine normally, with current solutions requiring complex screw-based fixing methods or lacking effective horizontal direction retention.
Innovation Solution
An elastically deformable engaging part and engaged part are provided on the circuit board or case body, which engage when the board is slid into a guide groove, ensuring secure fixation without the need for additional screws or complex assembly processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screw-based fixing method is used to secure the circuit board, then the reliability of preventing the circuit board from falling off is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The guide groove part is designed to automatically secure the circuit board through its own structure without requiring external fixing means. The guide protrusion part of the circuit board fits into the guide groove part, and the groove's geometry itself provides the securing function, eliminating the need for screws or additional fasteners.
Solution Approach 2:
The invention extracts and eliminates the screw-based fixing mechanism from the design. By removing the need for separate fixing components and processes, the solution simplifies the overall device structure while maintaining reliable circuit board fixation through the guide groove part's inherent design.
2Ease of manufacture
If no additional fixing means is used to reduce production cost, then the manufacturing cost is reduced, but the circuit board may fall off under mechanical external force
Solution Approach 1:
The guide groove part is designed with specific geometric parameters including a width that is smaller than the guide protrusion part. This dimensional parameter change creates a interference fit that securely retains the circuit board under vibration and mechanical stress without requiring additional fixing means or increasing production cost.
3Reliability
If the guide groove part width is made smaller than the guide protrusion part width for secure fixation, then the circuit board retention is improved, but the assembly difficulty increases
Solution Approach 1:
The circuit board is pre-positioned with the guide protrusion part aligned with the guide groove part before the lid is closed. This preliminary alignment ensures that the slightly tighter fit of the guide groove part does not prevent assembly, as the components are already in the correct position during the closing operation.
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 configuration reliably fixes the circuit board within the case body, preventing it from falling off and ensuring the electronic control device functions properly, even under mechanical stress, with a simpler and more cost-effective solution compared to traditional screw-based methods.
Implementation Method 1
an elastically deformable engaging part and an engaged part for complementarily engaging with this engaging part are provided on a circuit board or a case body. When the circuit board is slid and housed in a guide groove part formed inside the case body, the engaging part is deformed.
Data Source
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AI summary
Provided is an electronic control device which has a circuit board fixing structure with a simple configuration and suppresses a phenomenon of falling off of the circuit board from a case body by mechanical external force. An elastically deformable engaging part and an engaged part for complementarily engaging with this engagement part are provided on a circuit board or a case body. When the circuit board is slid and housed in a guide rail part formed inside the case body, the engaging part is deformed. When the circuit board reaches a predetermined position, the engaging part is engaged with the engaged part formed at the circuit board or the case body. With this configuration, the case body and the circuit board can be reliably fixed with a simple configuration.