Electrical Connection Box Cover Assembly Rotation Fulcrum
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Solution Overview
Problem
Conventional electrical connection boxes face challenges in workability when assembling the cover member to the housing main body, as existing configurations lack efficient mechanisms for relative positioning and secure locking.
Innovation Solution
The electrical connection box incorporates a first insertion lock mechanism serving as a rotation fulcrum for relative rotation between the cover and housing, along with a second insertion lock mechanism and a hook lock mechanism, utilizing cylindrical portions and groove projections for precise positioning and locking, enhancing the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional cover member assembly method is used, then the structure is simple, but the workability and assembly precision are poor
Solution Approach 1:
The locking mechanism is segmented into multiple independent components: first insertion locking pieces with first insertion receivers, second insertion locking pieces with second insertion receivers, and hook locking pieces with hook receivers. Each component performs a specific function in the assembly sequence, dividing the complex assembly process into manageable stages that improve workability while maintaining structured organization.
Solution Approach 2:
The insertion locking pieces are designed to be inserted into the receivers before final locking occurs. The first insertion locking pieces are inserted first to establish initial positioning, followed by rotation to engage the hook locking pieces. This preliminary insertion action prepares the components for subsequent locking operations, improving assembly ease.
2Manufacturing precision
If multiple locking mechanisms are added to improve assembly precision, then the positioning accuracy improves, but the manufacturing complexity increases
Solution Approach 1:
Multiple locking functions are merged into an integrated system where insertion locking pieces and hook locking pieces work together on the same cover member. The rotation fulcrum mechanism merges positioning and locking actions into a single rotational motion, achieving precise positioning without requiring separate complex positioning mechanisms.
Solution Approach 2:
The hook locking pieces automatically engage with their corresponding receivers when the cover member is rotated about the insertion locking pieces. The geometry of the components themselves provides the locking action without requiring additional actuators or complex control mechanisms, achieving precise positioning through the self-service nature of the mechanical engagement.
3Reliability
If the cover member and housing are rotated for assembly, then the locking reliability improves, but the assembly force required increases
Solution Approach 1:
Only partial rotation is required to engage the hook locking pieces with their receivers. The rotation continues beyond the minimum engagement point to ensure excessive action that guarantees reliable locking. This partial-but-sufficient rotation approach achieves high reliability without requiring excessive force that would be needed for complete 360-degree rotation or multiple complex locking steps.
Data Source
AI summary
An electrical connection box includes first insertion lock mechanisms and second insertion lock mechanisms. The first insertion lock mechanisms include respective first insertion locking pieces and respective first insertion receivers, and serve as rotation fulcrums of relative rotation of a lower cover and a frame in a state in which the respective first insertion locking pieces are inserted into the respective first insertion receivers and the respective first insertion locking pieces are not locked in the respective first insertion receivers. The second insertion lock mechanisms include second insertion locking pieces and second insertion receivers, guide the second insertion locking pieces with the second insertion receivers in a state in which the first insertion lock mechanisms serve as the rotation fulcrums, and determine the relative positions of the frame and the lower cover.