Connection Unit Sealing and Nut Retention Mechanism
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Solution Overview
Problem
Existing connection units for power units, such as motors, face challenges in maintaining a high sealing ability to prevent oil leakage from the transmission case, as they allow clearances between the terminal block housing and busbars, leading to oil leakage during power unit operation.
Innovation Solution
A connection unit design featuring a terminal block with a nut-accommodating portion, a terminal-connecting portion in tight contact with the block, and a nut cover that restricts movement in multiple directions, ensuring the nut is securely held and preventing leakage by eliminating clearances between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If clearances are allowed between the terminal block housing and busbars, then the assembly is easier to manufacture, but oil leakage occurs during power unit operation
Solution Approach 1:
A sealing ring made of elastic material is introduced between the terminal block housing and busbar to eliminate clearances and prevent oil leakage. The elastic sealing ring deforms to fill gaps and maintain tight sealing under vibration and operational conditions.
2Device complexity
If the nut cover is not restricted, then the assembly is simpler, but the nut may come off during operation
Solution Approach 1:
The nut cover is designed with movable restricting portions that can elastically deform to allow nut installation, then return to a locked position to prevent the nut from coming off during operation. This dynamic mechanism provides reliable retention without complex fixed structures.
3Ease of manufacture
If margins are allowed in guide walls and busbar pressers, then the assembly is easier to manufacture, but oil leakage risk increases
Solution Approach 1:
An elastic sealing ring is installed in the sealing groove of the terminal block housing to compensate for manufacturing clearances and margins in guide walls and busbar pressers. The elastic material deforms to fill gaps, preventing oil leakage even with manufacturing tolerances.
Data Source
AI summary
The present invention provides a connection unit capable of accommodating nuts and showing sealing ability in a state installed on a housing.A connection unit S includes: a terminal block 100 having holes h3 at one side of for accommodating nuts n; a terminal-connecting portions 200 at least partially exposed when viewed from the other side and fixed to the terminal block 100 with the circumferences of the terminal-connecting portions 200 in tight contact with the terminal block 100; and a nut cover 300 for covering the nuts accommodated in the holes h3 for preventing the nuts n from coming off. The connection unit S further includes: guide grooves and guide ribs for restricting movement of the nut cover 300 relative to the terminal block 100; and locking hooks 116 and locking holes h5 for restricting movement of the nut cover 300 relative to the terminal block 100.