Dielectric Compliant Joint for Torque Transfer and Shaft Isolation
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Solution Overview
Problem
In actuated ball valve systems, particularly in aircraft water supply systems, there is a need for a dielectric barrier to prevent electrical faults from the motor end from being transmitted to the metal ball shaft, while maintaining torque transmission, especially when the ball shaft becomes jammed or frozen, and to avoid damage from water ingress.
Innovation Solution
A dielectric insulator insert is placed between the ball shaft and the electric motor, shaped to define alternating flanges and recesses that engage with corresponding features on the shafts, providing a torque transfer mechanism that can withstand short torque peaks and maintain dielectric isolation, using materials like PEEK or rubber for superior compression strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric barrier is provided between the ball shaft and electric motor, then electrical insulation is improved, but torque transmission capability deteriorates
Solution Approach 1:
A dielectric insert is introduced as an intermediary component between the ball shaft and electric motor. This insert acts as a mediator that simultaneously provides electrical insulation (improving reliability) and transmits torque (maintaining force transmission). The insert's dual functionality resolves the contradiction by being a material that is both electrically insulating and mechanically strong enough to transmit torque through compression.
2Strength
If the ball shaft is made of metal, then durability is improved, but electrical conductivity increases causing potential faults
Solution Approach 1:
The harmful electrical conductivity property is extracted from the ball shaft system by introducing a dielectric insert that blocks electrical pathways. The metal ball shaft retains its durability benefits while the harmful electrical conductivity is removed or isolated by the dielectric barrier, preventing fault transmission between metal components.
3Reliability
If a dielectric insert is used, then electrical isolation is improved, but device complexity increases
Solution Approach 1:
The dielectric insert is designed to perform multiple functions simultaneously: it provides electrical insulation, transmits torque through compression, and can accommodate misalignment between shafts. By making the insert multi-functional, the overall device complexity is minimized while achieving reliable electrical isolation and torque transmission in a single integrated component.
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 dielectric insert ensures reliable torque transmission and electrical insulation between the motor and ball shaft, preventing electrical shocks and allowing for manual operation in case of motor failure, while maintaining system durability and safety standards.
Implementation Method 1
A dielectric insulator insert is placed between the ball shaft and the electric motor... ensuring reliable torque transmission and electrical insulation between the motor and ball shaft
Implementation Method 2
using materials like PEEK or rubber for superior compression strength... able to withstand short torque peaks
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A torque transfer assembly comprising a drive shaft (4) and a driven shaft (10) and a dielectric insert (20) arranged to be positioned between the drive shaft and the driven shaft, the insert assembly comprising a body of dielectric material shaped to form an insulating layer and configured to engage, respectively, with a first shaped engagement feature (15) on the drive shaft and a second shaped engagement feature (16) on the driven shaft, in torque transfer engagement, the insulating layer providing a dielectric barrier between the drive shaft and the driven shaft.