Electronic Control Device Barrier Portion Flux Adhesion
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Solution Overview
Problem
Conventional electronic control devices for vehicles require increased circuit board size to accommodate sufficient clearance between flux applied portions and waterproof seal portions, leading to adverse influences on the waterproof seal and higher unit costs due to reduced circuit board numbers when disposal boards are removed.
Innovation Solution
An electronic control device with a barrier portion between the connector pins and the waterproof seal portion, which prevents adhesion of flux and coating agents, and an extension seal portion that increases seal length while reducing the width of the waterproof seal portion, enhancing salt damage resistance and downsizing the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sufficiently large clearance is provided between flux applied portion and waterproof seal portion, then adhesion of flux and coating agent to waterproof seal portion is prevented, but circuit board size must be increased
Solution Approach 1:
The invention divides the connector structure into distinct functional zones by introducing a barrier portion that segments the space between the board connecting portion and the waterproof seal portion. This segmentation allows the flux applied portion to be spatially separated from the waterproof seal portion without requiring an overall increase in circuit board size, thus resolving the contradiction between maintaining waterproof seal performance and minimizing circuit board area.
Solution Approach 2:
The barrier portion acts as an intermediary element between the board connecting portion and the waterproof seal portion. It physically blocks the adhesion path of flux and coating agents while maintaining the necessary spatial relationship between components. This intermediary structure prevents harmful substance migration without requiring excessive clearance, thereby solving the contradiction between reliability and area.
2Reliability
If barrier portion is disposed between board connecting portion and connector-side waterproof seal portion, then adhesion of application agents to waterproof seal portion is suppressed, but device complexity increases
Solution Approach 1:
The barrier portion is merged with the connector structure as an integrated component rather than a separate additional element. By combining the barrier function with the existing connector anatomy, the invention suppresses adhesion of application agents without proportionally increasing device complexity. The barrier portion becomes part of the connector's overall structure, minimizing the complexity penalty.
3Reliability
If extension seal portion is added to increase seal length, then salt damage resistance is enhanced, but device dimensions increase
Solution Approach 1:
The extension seal portion is strategically positioned at the connector-side waterproof seal portion where salt damage resistance is most critical. By concentrating the extended sealing function locally at the most vulnerable interface rather than uniformly increasing seal length throughout the device, the invention enhances salt damage resistance while minimizing the overall increase in device dimensions. This localized approach optimizes the balance between reliability and compactness.
Data Source
AI summary
An electronic control device including a circuit board, a connector with connector pins having a board connecting portion at which the connector pins are electrically connected with the circuit board, a pair of housing members accommodating the circuit board and the connector therebetween, a waterproof seal portion through which connection between the connector and the pair of housing members and connection between the pair of housing members are provided in a fluid-tight manner, the waterproof seal portion including a connector-side waterproof seal portion disposed between the connector and one of the pair of housing members which is opposed to the board connecting portion of the connector pins, and a barrier portion disposed between the board connecting portion of the connector pins and the connector-side waterproof seal portion.