Automatic Transmission Control Circuit Terminal Protection
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Solution Overview
Problem
Existing control circuit devices for vehicle automatic transmissions face issues with terminal protection during transportation, exposure to foreign matter, and potential short circuits due to conductive debris, leading to increased assembly complexity and risk of electrical failures.
Innovation Solution
A control circuit device with a built-in control circuit unit and tab-like terminals, covered by a protective tube with partition walls and a locking mechanism, which collectively surrounds the terminals, preventing exposure and short circuits, and allows for simplified assembly and mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If terminals are exposed during transportation, then assembly operation is simplified, but terminals may deform due to contact with foreign matter
Solution Approach 1:
The protection tube is preliminarily assembled onto the terminals before shipping, creating a protective barrier that prevents foreign matter contact and deformation during transportation and storage. This preliminary protective action eliminates the need for terminal exposure while maintaining assembly simplicity.
2Adaptability or versatility
If control circuit unit, cover and base are assembled at mounting site, then adaptability to different vehicles is improved, but number of working processes increases
Solution Approach 1:
The control circuit unit, cover, and protection tube are merged into a pre-assembled integrated unit before shipping. This combining of components reduces the number of separate assembly operations required at the mounting site, while the base is still customized for different vehicle mounting locations, maintaining adaptability without increasing workflow complexity.
3Ease of manufacture
If terminals are not covered, then manufacturing process is simplified, but short circuit may occur due to conductive foreign matter
Solution Approach 1:
The protection tube serves as an intermediary barrier between the terminals and the external environment, including conductive foreign matter in oil. This intermediate protective layer prevents direct contact between terminals and potential contaminants, eliminating short circuit risks while maintaining manufacturing simplicity through the use of a straightforward protective covering.
4Reliability
If partition walls are added to protection tube, then short circuit between adjacent terminals is prevented, but device complexity increases
Solution Approach 1:
The protection tube is segmented into multiple sections by partition walls that divide the internal space into separate compartments for adjacent terminals. This segmentation physically isolates terminals from each other, preventing short circuits through conductive foreign matter, while the partition walls are integrated into the protection tube structure in a straightforward manner that minimizes overall device complexity.
Data Source
AI summary
A control circuit device for vehicle automatic transmission includes a control circuit unit having a body with a built-in control circuit for vehicle automatic transmission and tab-like terminals extending from the body while being lined in an arrangement direction. A cover covers the control circuit unit from one side in an intersection direction intersecting the arrangement direction. An insulating protection tube collectively surrounds the terminals and has partition walls to be disposed between adjacent terminals. The cover and the protection tube include locks configured to lock the cover and the protection tube to each other and positioning structures configured to position the control circuit unit. The control circuit unit is held positioned with respect to the cover and the protection tube with the cover and the protection tube locked by the locks.