Motor Slip Ring Assembly With External Fixing to Prevent Oil Leakage
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Solution Overview
Problem
Existing slip ring devices for motors face issues with oil leakage due to shrinkage of injection molded products and difficulties in fixing and inspecting the slip terminal on the inner diameter of the shaft, which complicates the assembly process and increases costs.
Innovation Solution
A slip ring device design featuring a shaft with a hollow interior and a slip terminal assembly located on the outer surface, secured by a fixing ring, eliminating the need for an opening through the inner and outer diameters of the shaft, thus preventing oil leakage and simplifying the assembly process through press-fitting of the fixing ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the slip terminal is disposed on the inner diameter of the shaft and insert injection-molded, then the slip terminal is protected and secured from centrifugal force, but oil leakage occurs due to shrinkage of the injection molded product
Solution Approach 1:
The slip terminal assembly is inverted from the traditional inner-diameter mounting to outer-diameter mounting on the shaft. The body portion surrounds the slip terminal from the outside, and the fixing ring secures it externally, eliminating the need for injection molding that causes shrinkage and oil leakage while maintaining secure fixation against centrifugal force
Solution Approach 2:
The slip terminal assembly is segmented into distinct functional components: the body portion for surrounding and securing the slip terminal, the fixing ring for external fixation to the shaft, and the slip terminal itself. This segmentation allows each component to perform its specific function optimally without the defects of integrated injection molding
2Strength
If the slip terminal is disposed on the inner diameter of the shaft, then it is secured from centrifugal force, but additional man-hours are required and post-inspection for shape deformation is difficult
Solution Approach 1:
By inverting the mounting location from inner to outer diameter, the assembly process becomes simpler with fewer man-hours required, and post-inspection for shape deformation is easily performed from the outside without disassembly
Solution Approach 2:
The external fixing ring design allows for self-inspection and self-adjustment without requiring disassembly or special inspection tools, enabling operators to easily verify the security and shape of the slip terminal assembly
Data Source
AI summary
A slip ring device for motor includes a shaft having a hollow therein, a slip terminal assembly including a first slip terminal portion and a second slip terminal portion and a body portion coupled to the shaft and electrically isolating the first slip terminal portion from the second slip terminal portion, and a fixing ring disposed on the slip terminal assembly and fixing the slip terminal assembly to the shaft and further includes a guide portion formed on an outer surface of the coupling portion in an insertion direction of the slip terminal assembly.