Rattling Prevention Structure for Electronic Component Modules
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Solution Overview
Problem
Existing electronic component modules and electrical connection boxes experience rattling due to vibration, leading to unstable engagement mechanisms and potential detachment of connector blocks or substrates, especially when protrusions wear out.
Innovation Solution
A rattling prevention structure featuring a bottomed cylindrical cover with a substantially rectangular opening portion and a block member, where four pressing protrusions are formed at the corner parts of both the cover and block member to bend the cover's walls inward, preventing movement and maintaining a stable engagement state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an engagement mechanism with protrusions is used to engage the cover and block member, then the engagement state is stabilized, but the protrusions wear out due to vibration causing rattling and potential detachment
Solution Approach 1:
The engagement mechanism is divided into two functional parts: the original protrusions for engagement and new pressing protrusions for vibration damping. This segmentation allows each part to specialize in its function, with pressing protrusions handling vibration absorption to protect the engagement protrusions from wear.
Solution Approach 2:
Pressing protrusions act as an intermediary element between the cover and block member. These pressing protrusions contact first during vibration, serving as a mediator that absorbs mechanical stress and prevents direct wear on the engagement protrusions, thereby extending their service life.
2Object-affected harmful factors
If the cover and block member are tightly engaged to prevent rattling, then vibration resistance improves, but the structure becomes more complex
Solution Approach 1:
The pressing protrusions are integrated into the existing cover and block member structures rather than being separate components. By merging the vibration damping function into the existing engagement structure, the solution prevents rattling without significantly increasing overall structural complexity.
Solution Approach 2:
The pressing protrusions serve multiple functions: they provide vibration damping, maintain engagement stability, and work in conjunction with the original engagement mechanism. This multi-functionality allows a single structural feature to address multiple requirements without proportionally increasing complexity.
3Object-affected harmful factors
If pressing protrusions are added to prevent rattling, then vibration resistance improves, but manufacturing complexity increases
Solution Approach 1:
The pressing protrusions utilize the existing material properties and geometric parameters of the cover and block member. By adjusting local geometric parameters (adding protrusions) rather than changing material properties or manufacturing processes, the solution achieves rattling prevention with minimal impact on manufacturing complexity.
Data Source
AI summary
A ratting prevention structure is provided. Further, an electronic component module, an electrical connection box, and a wire harness which adopt the ratting prevention structure are provided. The electronic component module includes a cover having a rectangular opening portion, a connector block inserted into the opening portion of the cover, and an engagement mechanism engaging the block member with the opening portion of the cover. The rattling prevention structure is used to prevent rattling between the cover and the block member. In the rattling prevention structure, four pressing protrusions are formed at any one of four corner parts of the cover and four corner portions of the block member at the opening portion. The four pressing protrusions are configured to bend four walls of the cover inward while displacing the four corner parts of the cover outward.