Junction Box ECU Attachment Using Slit-Guided Sliding Engagement
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Solution Overview
Problem
Existing electrical connection boxes require side walls for attaching an electronic control unit (ECU), limiting design flexibility and making it difficult to attach a second electrical device without these walls.
Innovation Solution
An electrical unit with a casing-shaped first device featuring an engagement recess and a second device with an engagement portion that slides over the surface, guided by a slit and rib configuration, allowing for attachment without side walls, enhancing design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If side walls are provided in the junction box to guide sliding of the ECU, then the ECU can be properly attached to the junction box, but the design flexibility and degree of freedom in changing the junction box design is limited
Solution Approach 1:
The guiding function is extracted from the side walls and transferred to a dedicated guiding structure (such as guide rails or positioning protrusions) that can be independently designed and positioned. This allows the side walls to be omitted or redesigned without affecting the attachment reliability, thus resolving the contradiction between attachment reliability and design flexibility.
Solution Approach 2:
The attachment mechanism is segmented into distinct functional components: guiding structures for positioning, engagement features for secure attachment, and support elements for stability. This segmentation allows each component to be optimized independently, enabling design changes to the junction box while maintaining reliable ECU attachment.
2Adaptability or versatility
If side walls are omitted from the junction box to increase design freedom, then the design flexibility is improved, but the operation for engaging the ECU shaft portions with the shaft receiving portions is impaired
Solution Approach 1:
An intermediary guiding structure is introduced to mediate between the ECU shaft portions and the shaft receiving portions. This intermediary component provides the necessary guidance and alignment during the engagement operation, ensuring ease of attachment even when traditional side walls are omitted, thus resolving the contradiction between design freedom and engagement operation.
3Reliability
If traditional shaft sliding over bottom surface with side wall guidance is used, then engagement can be achieved, but the degree of freedom in design changes is restricted
Solution Approach 1:
The attachment mechanism is designed to be dynamic and adaptable, allowing for different configurations and variations in the junction box design. The guiding structures and engagement features are designed to accommodate design changes while maintaining reliable engagement, reducing design constraints without compromising engagement capability.
Data Source
AI summary
An electrical unit including a casing-shaped junction box having one surface provided with an engagement recess, and an ECU configured to be attached to the one surface and having an engagement portion configured to slide over the one surface and engage with the engagement recess, the electrical unit including: a slit formed in the one surface and configured to guide sliding of the engagement portion to the engagement recess; and a rib provided on the engagement portion and configured to be inserted into the slit during sliding of the engagement portion.