Electrical Connection Box Flexible Holding Pieces
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Solution Overview
Problem
Conventional electrical connection boxes lack effective means to securely hold wiring materials, particularly those with conductive corrugated tubes, which can lead to improper insertion and potential damage or leakage.
Innovation Solution
The electrical connection box features a casing with flexible holding pieces and a supporting projection part that securely clips and holds the wiring material, preventing bending and external forces, while also providing a water-tight seal through the use of a corrugated tube covering the wiring material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wiring material is inserted through an opening in the casing, then electrical connection is enabled, but the wiring material cannot be securely held and may bend or be damaged
Solution Approach 1:
The insertion port is divided into multiple functional components: the opening portion for insertion, holding pieces with clipping portions to grip the wiring material, and a supporting projection part to provide structural support. This segmentation allows each component to perform its specific function effectively.
Solution Approach 2:
The holding pieces are designed with localized flexibility at the clipping portions to adapt to and grip the wiring material, while the supporting projection part provides rigid structural support. This local differentiation of mechanical properties ensures both secure holding and ease of insertion.
2Reliability
If holding pieces are added to secure the wiring material, then holding security is improved, but the device structure becomes more complex
Solution Approach 1:
The holding pieces are integrated directly into the casing structure, merging the holding function with the existing casing components rather than adding separate external holding devices. This reduces overall device complexity while maintaining holding security.
Solution Approach 2:
The holding pieces serve multiple functions: they guide the wiring material during insertion, grip and secure the wiring material, and work in conjunction with the supporting projection part to prevent bending. This multi-functionality reduces the need for additional components.
3Adaptability or versatility
If the holding pieces are made flexible to adapt to wiring material, then holding adaptability is improved, but the structural strength decreases
Solution Approach 1:
The holding piece is segmented into a flexible clipping portion that contacts the wiring material and a rigid supporting portion that is fixed to the casing. This segmentation allows the clipping portion to be flexible for adaptation while the supporting portion maintains structural strength.
Solution Approach 2:
The holding piece has localized flexibility at the clipping portions to adapt to the wiring material shape and size, while the root portion and supporting projection part maintain high structural strength. This local differentiation of mechanical properties resolves the contradiction between flexibility and strength.
Data Source
AI summary
An electrical connection box and a wire harness is provided with a casing including: a frame and an upper cover that are assembled to each other and that define a housing space portion; and insertion ports that are formed by opening a boundary edge of the frame or the upper cover to cause a conductive wiring material to be inserted through each of the insertion ports. The frame includes a pair of holding pieces that are provided on both sides of the insertion ports, the pair of holding pieces having flexibility in a clipping direction, and clipping and holding the wiring material. The upper cover includes a supporting projection rib that supports the pair of holding pieces at the side opposite from the wiring material, while the frame and the upper cover are assembled to each other.