Terminal Fitting Face Contact Stability
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Solution Overview
Problem
Conventional terminal fittings for shielded electric wires lack stability and strength due to point contact mechanisms, which lead to positional instability and wasteful space issues when overlapped, and are prone to wobbling due to dimensional deviations.
Innovation Solution
The terminal fitting design incorporates convex sections on the attachment sections that make face contact with each other, increasing the contact area and stability, and includes a protruding section and hole section configuration with a wall section for enhanced stability and strength, eliminating wasteful space by using sheet metal pieces with specific convex and concave formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If point contact mechanism is used for overlapping terminal fitting pieces, then the structure is simple, but the stability and strength are insufficient
Solution Approach 1:
The invention transitions from point contact (zero-dimensional contact) to face contact (two-dimensional contact) by extending the convex section to create a contact surface. This dimensional change significantly improves positional stability while maintaining structural simplicity, as the larger contact area distributes forces more effectively and reduces sensitivity to dimensional deviations.
Solution Approach 2:
The convex section is pre-formed on the terminal fitting piece before assembly, establishing the face contact geometry in advance. This preliminary action ensures that when the pieces are overlapped, the face contact is automatically achieved without requiring additional adjustment or complex positioning mechanisms during assembly.
2Ease of manufacture
If point contact mechanism is used for overlapping terminal fitting pieces, then the manufacturing is simple, but the strength is insufficient
Solution Approach 1:
By extending the contact from a point to a face (increasing contact dimension), the invention distributes mechanical loads over a larger area. This face contact mechanism maintains manufacturing simplicity through the convex section geometry while significantly improving connection strength through enhanced force distribution and reduced stress concentration.
3Ease of operation
If protruding section and hole section are used for connection, then the assembly is simple, but positional accuracy is poor due to dimensional deviation
Solution Approach 1:
The invention replaces point contact (zero-dimensional) with face contact (two-dimensional) between the convex section and the opposing surface. This dimensional increase provides a larger tolerance window for dimensional deviations while maintaining assembly simplicity, as the face contact naturally compensates for minor variations in manufacturing dimensions.
4Strength
If wall section with hole section is used, then connection strength is improved, but wasteful space is created
Solution Approach 1:
The convex section is strategically positioned to provide face contact precisely where needed for strength, rather than adding material throughout the entire structure. This localized quality approach enhances connection strength at the critical interface while minimizing overall material usage and avoiding wasteful space in non-critical areas.
Data Source
AI summary
Provided is a terminal fitting that includes a first terminal fitting having a first electric wire holding section for holding an electric wire, a first attachment section to be attached to an attachment target object, and a protruding section provided on the first attachment section, and a second terminal fitting piece having a second electric wire holding section for holding an electric wire, a second attachment section to be attached to the attachment target object, and a hole section provided in the second attachment section, the first attachment section and the second attachment section being overlapped with each other in a state that the protruding section is inserted into the hole section.