Terminal Fitting Seam Constraint for Stable Contact Load
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Solution Overview
Problem
The existing terminal fittings with hollow cylindrical parts can experience outward movement of end surfaces, leading to weak contact loads and unintended connection postures, reducing connection reliability.
Innovation Solution
A terminal fitting design featuring a hollow cylindrical portion with cantilevered resilient contact pieces and an opening preventing portion that contacts or closely faces the outer surface of adjacent parts, suppressing radial displacement and maintaining a secure connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the hollow cylindrical part is formed by butting end surfaces, then the structure is simple, but the end surfaces may move outward to open the hollow cylindrical part, reducing connection reliability
Solution Approach 1:
The hollow cylindrical part is divided into two parts (first part and second part) that are adjacent across the seam. The opening preventing portion is provided on one of these parts to contact or closely face the outer surface of the other part, preventing relative outward movement and maintaining connection reliability without significantly complicating the overall structure.
2Ease of manufacture
If the hollow cylindrical part is formed by bending a plate material with an exposed seam, then manufacturing is simplified, but the seam may open due to outward movement of parts
Solution Approach 1:
The opening preventing portion is designed to contact or closely face the outer surface of the adjacent part before final assembly, preliminarily preventing any potential outward movement that could cause seam opening. This preliminary constraint ensures maintaining the bent cylindrical shape and seam alignment during the connection process.
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 solution effectively prevents opening from the seam of the hollow cylindrical portion, enhancing connection reliability by maintaining a stable contact state and preventing unintended rotations.
Implementation Method 1
a plurality of resilient contact pieces cantilevered from the hollow cylindrical portion
Implementation Method 2
one of the parts being provided with an opening preventing portion in contact with or closely facing an outer surface of the other part
Data Source
AI summary
Opening from a seam of a hollow cylindrical portion of a terminal fitting can be suppressed. A terminal fitting (10) is provided with a hollow cylindrical portion (20) and a plurality of resilient contact pieces (31) cantilevered from the hollow cylindrical portion (20). The hollow cylindrical portion (20) is formed by bending a plate material such that a second seam (22) is exposed on an outer peripheral surface. The hollow cylindrical portion (20) includes a first part (24) and a second part (25) adjacent across the second seam (22). The first part (24) is provided with an opening preventing portion (50) in contact with an outer surface of the second part (25).