Terminal Fitting Fixing Structure for Wire Harness
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Solution Overview
Problem
Conventional terminal fitting fixing structures for unshielded cables in vehicles allow relative movement between terminal fittings and braided bodies until crimping, leading to reduced workability during mounting.
Innovation Solution
A terminal fitting fixing structure with a cylindrical portion and sleeve, featuring first and second crimping regions, where the cylindrical portion is radially deformed inward to crimp the braided body between the terminal fitting and cable, and the sleeve is similarly deformed to crimp between the sleeve and terminal fitting, preventing relative movement and ensuring secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal fitting is fitted around the cable and braided body without preliminary fixation, then the terminal fitting can be positioned at a predetermined position, but the terminal fitting may be shifted during mounting, lowering workability
Solution Approach 1:
The patent applies preliminary action by forming a crimped state of the braided body between the terminal fitting and cable before the final assembly step. This preliminary crimping fixes the terminal fitting at a predetermined position relative to the cable and braided body, preventing any shifting during subsequent mounting operations. The first crimping region creates this preliminary fixation that maintains positioning accuracy while improving workability.
2Reliability
If the sleeve is crimped onto the terminal fitting with the folded back braided body sandwiched between, then the terminal fitting is fixed to the braided body, but the movements are not restricted until crimping, reducing mounting efficiency
Solution Approach 1:
The patent applies segmentation by dividing the crimping process into two distinct regions: a first crimping region that creates a preliminary crimped state to restrict movements and improve mounting efficiency, and a second crimping region that provides final secure fixation. This segmentation allows the mounting process to be more efficient while maintaining reliable fixation security through the two-stage crimping approach.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structure effectively prevents relative movement between the terminal fitting and braided body, enhancing workability by allowing secure crimping at predetermined positions, thus improving the mounting process.
Implementation Method 1
in the first crimping region, the cylindrical portion is deformed radially inward and forms a crimped state of the braided body between the terminal fitting and the cable
Implementation Method 2
in the second crimping region, the sleeve is deformed radially inward, and forms a crimped state of the braided body at least between the sleeve and the terminal fitting
Data Source
AI summary
A terminal fitting includes a cylindrical portion having a first crimping region and a second crimping region. A crimped state of a braided body extending through the terminal fitting is formed between the terminal fitting and a cable at the first crimping region such that relative movements of the terminal fitting and the braided body are prevented, and an end of the braided body is then folded back and positioned to face an outer surface of the cylindrical portion in a radial direction. The crimped state of the braided body is then formed between a sleeve and the terminal fitting at the second crimping region, so that the terminal fitting is fixed to the braided body.