Wiring Unit Rectifying Plate for Automatic Transmission Oil Bubble Prevention
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Solution Overview
Problem
In automatic transmissions, oil flowing down onto wire harnesses can form oil bubbles due to their complex uneven surfaces, leading to difficulties in controlling oil pressure as air is enclosed, reducing the applied pressure.
Innovation Solution
A wiring unit configuration that includes a wire harness routed on a wiring board with an inclined portion and a rectifying member featuring inclined rectifying plates, along with a filter, to decelerate and guide oil flow, preventing air from being enclosed and thus reducing bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire harness with multiple electrical wires tied together is used, then the wire harness can perform its function of transmitting electrical signals, but the complex uneven surface causes oil to splash and form oil bubbles when oil flows down
Solution Approach 1:
A rectifying member with a rectifying plate is introduced as an intermediary component between the oil flow path and the wire harness. This rectifying plate has a smooth surface that redirects oil flow to be substantially horizontal, preventing oil splashing and air enclosure on the complex wire harness surface, thus eliminating oil bubble formation while maintaining wire harness functionality
2Productivity
If oil flows down vertically onto the wire harness, then oil can reach the lower part of the automatic transmission, but air is enclosed in the oil forming bubbles that reduce oil pressure
Solution Approach 1:
Instead of allowing oil to flow vertically downward onto the wire harness, the rectifying plate inverts the flow direction by redirecting oil to flow substantially horizontally along the plate surface. This inversion of flow direction prevents air from being enclosed in the oil, eliminating bubble formation while maintaining efficient oil circulation
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 solution effectively reduces oil bubble formation by slowing down oil flow and preventing air enclosure, maintaining stable oil pressure and preventing oil from splashing or forming bubbles when it flows down into the automatic transmission.
Implementation Method 1
the rectifying member is provided with a rectifying plate that is located inside a through hole that penetrates through the rectifying member in a top-bottom direction, and that has a plate surface that is inclined relative to a vertical direction... the force of the oil that has flowed down to the rectifying plate from above is reduced by the rectifying plate, and the oil is rectified so as to flow down in a direction that is inclined relative to the vertical direction
Data Source
AI summary
Provided is a wiring unit in which oil bubbles are prevented from being generated. A wiring unit includes: a wire harness; and a rectifying member that is located above the wire harness and is provided with a rectifying plate that is located inside a through hole that penetrates through the rectifying member in a top-bottom direction, and that has a plate surface that is inclined relative to a vertical direction.