Flexible IDT Cantilever Pin Structure for Vibration Tolerance
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Solution Overview
Problem
In electronic modules, especially those requiring performance during vibration, existing insulation displacement terminals (IDTs) face issues with tolerance stack-up and stress due to their rigid attachment, leading to potential deformation and fracture.
Innovation Solution
A flexible insulation displacement terminal design featuring a press-fit pin geometry on a cantilever beam that allows for flexibility, absorbing tolerance stack-up and reducing stress, while remaining rigidly attached to the housing, with options for coining or material reduction to minimize deflection force and stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IDT is rigidly attached to the housing with an interference fit, then the connection stability during vibration is improved, but the tolerance stack-up causes deformation and fracture of the IDT
Solution Approach 1:
The IDT is divided into multiple segments: a rigid portion that attaches to the housing and a flexible portion (cantilever beam) that connects to the circuit board. This segmentation allows different parts of the IDT to have different mechanical properties - the rigid portion provides stable attachment while the flexible portion absorbs stress from tolerance stack-up, preventing deformation and fracture.
Solution Approach 2:
The IDT transitions from a completely rigid structure to a dynamic structure with a flexible cantilever beam portion. This flexible portion can deflect and absorb mechanical stress from tolerance variations and vibrations, while the rigid portion maintains stable attachment to the housing, resolving the contradiction between rigidity and stress resistance.
2Strength
If the IDT is made flexible to absorb tolerance stack-up, then the stress and deformation are reduced, but the connection stability during vibration may be compromised
Solution Approach 1:
The IDT is divided into multiple segments: a rigid portion that attaches to the housing and a flexible portion (cantilever beam) that connects to the circuit board. This segmentation allows different parts of the IDT to have different mechanical properties - the rigid portion provides stable attachment while the flexible portion absorbs stress from tolerance stack-up, preventing deformation and fracture.
Solution Approach 2:
Different portions of the IDT are given different mechanical qualities - the portion attached to the housing is rigid for stable connection, while the portion connecting to the circuit board is flexible to absorb tolerance stack-up. This local differentiation of mechanical properties allows the IDT to simultaneously achieve both stability and stress resistance.
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 flexible IDT design enhances the robustness of electronic control modules by absorbing tolerance stack-up without deformation or fracture, ensuring reliable connections and performance during vibrations.
Implementation Method 1
The fourth beam is configured as a cantilever beam with an attached lower end and a distal end that is able to move between the third beam and the fifth beam
Data Source
AI summary
An insulation displacement terminal comprises a first portion, a second portion, and a press-fit pin. The first portion may comprise a first beam and a second beam. A slot is generally formed by a first central edge of the first beam and a second central edge of the second beam. The second portion may comprise a third beam, a fourth beam, and a fifth beam. The fourth beam is configured as a cantilever beam with an attached lower end and a distal end that is able to move between the third beam and the fifth beam. The press-fit pin is generally attached to an edge of the distal end of the fourth beam.