Non-Conductive Rotary Switch Shaft With Segmented Conductive Rings
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Solution Overview
Problem
Rotary switches used in systems like aircraft and spacecraft face reliability, cost, and manufacturing efficiency issues with existing designs.
Innovation Solution
A shaft assembly for rotary switches made from electrically non-conductive material with circumferential grooves and conductive ring segments, using a bonding adhesive to position conductive and non-conductive ring segments, allowing for reliable and efficient power switching between redundant power sources and devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional conductive shaft designs are used, then electrical conductivity is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The shaft is divided into a non-conductive base shaft and separate conductive ring segments that are independently manufactured and then assembled. This segmentation allows each component to be optimized separately, reducing manufacturing complexity while maintaining the overall conductivity function of the shaft assembly.
Solution Approach 2:
The shaft assembly combines non-conductive shaft material with conductive ring segment materials to create a composite structure. This allows the shaft to have both mechanical strength from the non-conductive material and electrical conductivity from the conductive segments, resolving the contradiction between reliability and manufacturing complexity.
2Reliability
If multiple ring segments are assembled with precise alignment, then electrical contact reliability improves, but assembly time and manufacturing cost increase
Solution Approach 1:
Alignment features such as pins, recesses, and circumferential grooves are pre-formed on the ring segments and shaft during manufacturing. These preliminary actions ensure that when the ring segments are assembled, they automatically align with the correct orientation and position, eliminating the need for time-consuming manual alignment procedures and thereby increasing assembly speed while maintaining electrical contact reliability.
3Ease of manufacture
If conventional shaft materials are used, then manufacturing simplicity is maintained, but electrical insulation and conductivity control become difficult
Solution Approach 1:
The shaft assembly is segmented into a non-conductive base shaft for structural support and insulation, and separate conductive ring segments for electrical conduction. This segmentation allows the use of simple, conventional materials for the shaft while achieving reliable electrical insulation, as the non-conductive shaft material can be any standard insulating material without requiring special conductivity control.
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 shaft assembly enhances reliability, reduces manufacturing costs, and simplifies production while enabling efficient switching between power sources and devices in critical systems.
Implementation Method 1
The bonding adhesive is positioned between the circumferential groove and the conductive ring segment
Data Source
AI summary
Described herein is a shaft assembly for a rotary switch that includes a shaft made from an electrically non-conductive material. The shaft includes at least one circumferential groove that has a generally T-shaped cross-section. The shaft assembly also includes at least one conductive ring segment made from an electrically conductive material positioned within the circumferential groove. The conductive ring segment has a generally T-shaped cross-section. Additionally, the shaft assembly includes a bonding adhesive that is positioned between the circumferential groove and the conductive ring segment.