Ceramic Shaft-Hub Force Transmission for Electrical Insulation
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Solution Overview
Problem
Existing shaft-hub connections in electrical devices face issues with current discharge leading to bearing damage, which is often shifted to driven machines, and conventional insulation methods like plastics offer low stiffness and load-transmission capability.
Innovation Solution
A force transmission assembly with a connecting unit predominantly made of technical ceramic, such as Si3N4, SiAlON, and Al2O3, providing reliable electrical insulation, high stiffness, and load-transmission capability, while allowing for torque transmission and axial movement, and featuring a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic-based devices are used to provide electrical insulation, then electrical insulation is achieved, but stiffness and load-transmission capability are low
Solution Approach 1:
The patent employs ceramic materials (such as aluminum oxide, silicon nitride, or silicon carbide) as insulating elements instead of plastic-based materials. These ceramics provide both excellent electrical insulation properties and high mechanical strength, simultaneously resolving the contradiction between insulation reliability and structural strength. The ceramic insulating elements are integrated into the force transmission assembly to maintain both electrical isolation and mechanical load-bearing capacity.
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 ceramic-based assembly achieves efficient electrical insulation, high stability, and load-transmission capability, particularly in high-frequency ranges, reducing the risk of current discharge damage and enhancing the structural integrity of electrical devices.
Implementation Method 1
the connecting unit is composed of at least a majority of technical ceramic... reliable electrical insulation, specifically in the high-frequency range, can be achieved
Data Source
AI summary
A force-transmitting assembly includes a metal shaft having at least two longitudinally-extending grooves defined in an outer surface, and a metal hub having at least two longitudinally-extending grooves defined in an inner surface that surrounds the outer surface of the shaft. A plurality of discrete parts is disposed in the at least two longitudinally-extending grooves of the shaft and the hub in an interference-fit manner so as to transmit a torque from the shaft to the hub. Each of the discrete parts is composed of at least 50 mass % of technical ceramic selected from Si3N4, SiAlON, Al2O3, ZrO2, or a mixture of two or more of Si3N4, SiAlON, Al2O3, and ZrO2.