Board Connector Reinforcing Portion Suppresses Solder Stress
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Solution Overview
Problem
Existing board connectors face reliability issues due to stress concentration at soldered parts when fixing brackets are mounted on a circuit board, leading to potential solder cracks from thermal deformation and external interference.
Innovation Solution
A board connector design featuring a housing with a terminal holding wall and supporting walls, where a reinforcing portion links the supporting walls to the terminal holding wall, suppressing tilt and external interference, and includes a plate-like upper and lower linking portion to enhance rigidity and protect terminal fittings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fixing brackets are mounted on supporting walls and soldered to the circuit board to enhance fixing strength, then the fixing strength is improved, but stress concentrates on soldered parts and the circuit board, causing solder cracks when the supporting walls tilt due to thermal deformation
Solution Approach 1:
The housing is divided into multiple functional walls: terminal holding wall for holding terminal fittings, supporting walls for mounting fixing brackets, and reinforcing walls linking the two. This segmentation allows each wall to perform its specific function while distributing stress across the entire housing structure rather than concentrating it at solder joints.
Solution Approach 2:
Different portions of the housing are given different structural qualities: the terminal holding wall is designed to hold terminal fittings, the supporting walls are designed to mount fixing brackets, and the reinforcing walls are specifically designed to link these components and suppress tilting. Each local region has optimized properties for its specific function.
2Stability of the object's composition
If the supporting wall is allowed to tilt due to thermal deformation, then the housing can accommodate thermal expansion, but stress concentrates at the soldered parts of the fixing bracket and circuit board, leading to solder cracks
Solution Approach 1:
The reinforcing walls are pre-designed and integrated into the housing structure before thermal deformation occurs. These reinforcing walls establish a rigid linkage between the supporting walls and terminal holding wall, preventing tilting before it can cause stress concentration at solder joints during thermal cycles.
3Reliability
If the terminal holding wall is rigidly fixed to prevent tilting, then stress concentration is reduced, but the housing cannot accommodate thermal deformation
Solution Approach 1:
The housing is segmented into functionally independent walls that can deform locally without affecting the entire structure. The terminal holding wall, supporting walls, and reinforcing walls are designed as separate functional units that work together, allowing localized thermal accommodation while maintaining overall structural stability.
Data Source
AI summary
A board connector (A) is provided with a housing (10) placed on a circuit board (P) and including a terminal holding wall (11) substantially at a right angle to the circuit board (P) and supporting walls (15) extending rearward from sides of the terminal holding wall (11). Terminal fittings (25, 26) penetrate through the terminal holding wall (11) and are connectable to the circuit board (P) behind the terminal holding portion (11). Fixing brackets are mounted on the supporting walls (15) and are fixable to the circuit board (P) by soldering. A reinforcing portion (20: 21 or 23) links the supporting walls (15) and a rear surface of the terminal holding wall (11).