Motor Terminal Sealing Cap Structure for Oil-Tight Assembly
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Solution Overview
Problem
Existing motor designs face challenges in maintaining high assembling workability due to the sealing cap of the power line hole being prone to dislodgement during assembly, which compromises the sealing of lubricating oil and affects the precision components like the encoder.
Innovation Solution
The motor design incorporates a sealing cap that is fitted over the terminal portion exposed in a hole portion of the partition wall, with a protruding portion contacting the stator's molded portion to prevent lubricating oil ingress and is secured by a solderless terminal connection, ensuring the cap remains in place during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing cap is used to block the hole portion in the partition wall, then liquid tightness is enhanced, but the sealing cap is prone to dislodgement during assembly
Solution Approach 1:
The sealing cap is divided into multiple functional portions: a cap body for blocking the hole, a protruding portion for engagement with the stator, and a recessed portion for receiving the terminal portion. This segmentation allows each portion to perform its specific function independently, preventing dislodgement while maintaining liquid tightness
Solution Approach 2:
The terminal portion is nested within the recessed portion of the sealing cap, creating a nested structure where the terminal portion is received by the cap. This nesting arrangement secures the sealing cap in place during assembly while maintaining the electrical connection functionality
2Adaptability or versatility
If the terminal portion is exposed in the hole portion for power line connection, then electrical connectivity is enabled, but lubricating oil can ingress through the hole
Solution Approach 1:
The sealing cap provides different local qualities: the cap body provides sealing quality to prevent oil ingress, while the recessed portion provides electrical connection quality by receiving the terminal portion. This local differentiation resolves the contradiction between sealing and connectivity
Solution Approach 2:
The sealing cap acts as an intermediary component between the hole portion and the terminal portion. It mediates between the requirement for oil sealing and the requirement for electrical connectivity, providing both functions simultaneously through its structured design
Data Source
AI summary
Provided is a motor including a housing forming an accommodation chamber where a stator is accommodated, in which the housing includes a partition wall that separates the accommodation chamber and an outside, the stator is electrically connected to a terminal portion, at least a part of the terminal portion is exposed in a hole portion provided in the partition wall, the accommodation chamber is blocked by a sealing cap being an insulator, in the hole portion, and the terminal portion is configured to be connected, on the outside, to a power line that supplies power to the stator.