Compliant Joint Drive Assembly With Dielectric Torque Isolation
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Solution Overview
Problem
Existing drive assemblies in ball valves, particularly in aircraft water systems, face issues with dielectric separation between the electric motor and the wet components, leading to potential electrical faults and motor failure, which can cause damage and operational challenges.
Innovation Solution
A dielectric connector is introduced between the drive and driven shafts, featuring a non-circular cross-section with protrusions and recesses to ensure torque transfer while providing a dielectric barrier, allowing for reliable torque transmission and preventing electrical conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric connector is introduced between the drive shaft and driven shaft, then electrical isolation is improved, but device complexity increases
Solution Approach 1:
A dielectric connector is introduced as an intermediary component between the drive shaft and driven shaft. This connector provides electrical isolation while maintaining mechanical torque transmission, resolving the contradiction by adding a mediating element that performs both functions simultaneously.
Solution Approach 2:
The dielectric connector is made from composite materials that combine dielectric properties for electrical isolation with mechanical strength for torque transmission. This allows a single component to fulfill both electrical and mechanical requirements without significantly increasing overall device complexity.
2Reliability
If a dielectric barrier is provided between the ball shaft and electric drive part, then protection from electrical faults is improved, but torque transmission capability may worsen
Solution Approach 1:
The dielectric connector acts as a mediator that transmits torque through its mechanical structure while blocking electrical conduction. The connector's design ensures that torque is effectively transmitted from the drive shaft to the driven shaft despite the electrical isolation it provides.
Solution Approach 2:
The dielectric connector's material properties and geometric parameters are optimized to maintain adequate torque transmission capability while providing sufficient electrical isolation. By adjusting parameters such as connector dimensions, material strength, and engagement features, both requirements are satisfied simultaneously.
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 connector effectively isolates the metal shafts, preventing electrical shocks and ensuring torque transfer even in harsh environments, enabling reliable operation of the ball valve assembly.
Implementation Method 1
a dielectric connector positioned between, and connecting the drive shaft and the driven shaft, the connector comprising a body of dielectric material defining an insulating barrier between the drive and the driven shaft
Implementation Method 2
the connector comprising a dielectric barrier body having a first side from which a protrusion extends, the protrusion configured to engage in a correspondingly shaped recess formed in one of the drive shaft or the driven shaft
Data Source
AI summary
A torque transfer assembly includes a drive shaft and a driven shaft and a dielectric connector positioned between. The connector connects the drive shaft and the driven shaft and includes a body of dielectric material defining an insulating barrier between the drive and the driven shaft. The connector includes a dielectric barrier body having a first side from which a protrusion extends, the protrusion configured to engage in a correspondingly shaped recess formed in one of the drive shaft or the driven shaft, and a second side, opposite the first side, in which is formed a recess shaped to receive a correspondingly shaped protrusion extending from the other of the drive shaft or the driven shaft, the connector providing a dielectric barrier between the drive shaft and the driven shaft.