Electrical Connection Box Substrate Rattle Suppression
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Solution Overview
Problem
Conventional electrical connection boxes for vehicle wire harnesses experience rattling issues due to inadequate fixation mechanisms.
Innovation Solution
The electrical connection box features a dual-member case structure with protrusions and abutting parts that generate a pushing force to sandwich the substrate, providing secure fixation and preventing rattling. This includes a first protrusion from the main case and a second protrusion from the lower case, along with abutting parts that push against a fixing object surface to stabilize the substrate between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple engagement arm and engagement hole structure is used to attach the electrical connection box, then the device complexity is reduced, but rattling occurs due to insufficient fixation
Solution Approach 1:
The case is divided into a first member and a second member that face each other, with each member containing specific protrusions. This segmentation allows for independent optimization of each component's function while maintaining overall structural integrity and reducing rattling through distributed contact points.
Solution Approach 2:
Specific protrusions are strategically positioned at critical locations: the first protrusion from the first member, the second protrusion from the second member, and the abutting part on the second member. These localized structural features create precise contact points that enhance fixation stability without requiring complex overall restructuring.
2Reliability
If the substrate is securely sandwiched between protrusions to suppress rattling, then the reliability is improved, but the device complexity increases due to additional protrusions and abutting parts
Solution Approach 1:
The abutting part is integrated into the second member of the case structure, combining the functions of structural support and substrate positioning in a single component. This merging reduces the need for separate fixation elements while achieving reliable substrate clamping between the protrusions.
Solution Approach 2:
The second member serves multiple functions: it provides the second protrusion for substrate clamping, includes the abutting part for generating pushing force against the fixing object surface, and maintains structural integrity. This multi-functionality reduces overall device complexity by eliminating the need for separate components.
Data Source
AI summary
An electrical connection box applicable to a wire harness includes a case including a housing space that is formed inside by a first member and a second member facing each other along an opposite direction and that houses a substrate, and a locking part that is locked to a fixing object surface. The first member includes a first protrusion, and the second member includes a second protrusion formed to face the first protrusion and an abutting part that abuts on the fixing object surface in a state in which the locking part is locked to the fixing object surface, generates a pushing force along the opposite direction, and has the substrate sandwiched between the first protrusion and the second protrusion.