Wiring Unit Filter for Automatic Transmission Oil Bubble Reduction
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Solution Overview
Problem
Oil bubbles form in automatic transmissions due to oil falling onto complexly irregular wire harnesses, leading to reduced oil pressure control as air inside the bubbles deflates.
Innovation Solution
A wiring unit with a filter having a polygonal cross-section framework is integrated into the wiring board, which separates and ruptures oil bubbles, and is positioned above an oil path to further reduce bubble formation and facilitate oil pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire harness is arranged in the automatic transmission, then electrical control functions are provided, but oil bubbles are created when oil falls onto the wire harness
Solution Approach 1:
A filter is introduced as an intermediary component between the wire harness and the oil path. The filter captures and removes oil bubbles before they can enter the hydraulic system, thereby preventing the harmful effects of oil bubbles while maintaining the wire harness for electrical control functions.
Solution Approach 2:
The filter is divided into multiple functional zones including a foam filter portion for capturing larger bubbles and a mesh filter portion for finer filtration. This segmentation allows the system to effectively handle different sizes of oil bubbles generated by the wire harness arrangement.
2Device complexity
If oil bubbles are created in the transmission oil, then the wire harness arrangement is maintained, but oil pressure control becomes difficult
Solution Approach 1:
The filter acts as a mediator that removes oil bubbles from the oil before it reaches the hydraulic control system. This ensures stable oil pressure and smooth operation of transmission components while maintaining the necessary wire harness arrangement for electrical control.
Solution Approach 2:
The filter is positioned to remove oil bubbles in advance before the oil enters the hydraulic system. By performing preliminary bubble removal, the system prevents pressure fluctuations and ensures stable oil pressure control without requiring changes to the wire harness arrangement.
3Stress or pressure
If a filter is added to remove oil bubbles, then oil pressure control is improved, but device complexity increases
Solution Approach 1:
The filter is integrated with the existing wire harness structure, combining the electrical control function and the oil bubble removal function into a single compact assembly. This merging reduces overall device complexity while maintaining effective oil pressure control.
Solution Approach 2:
The filter structure serves multiple functions: it removes oil bubbles, supports the wire harness, and integrates with the transmission housing. This multi-functionality reduces the need for separate components, thereby minimizing device complexity while improving oil pressure control.
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 the number of oil bubbles, allowing for improved control of oil pressure by ensuring oil with fewer bubbles enters the pump intake, enhancing operational efficiency.
Implementation Method 1
the framework of the filter has a polygonal cross section, the oil bubbles rupture when they come into contact with ridge line portions of the framework
Implementation Method 2
Oil such as ATF (Automatic Transmission Fluid) flows through the interior of the automatic transmissions. The oil may fall onto the wire harness from above
Implementation Method 3
the oil path is provided with a pump for causing the oil to flow
Data Source
AI summary
A wiring unit that can reduce the number of oil bubbles. A wiring unit includes: a wire harness; and a wiring board on which the wire harness is arranged, wherein the wiring board has a through hole that penetrates the wiring board, and a filter that is provided in the through hole, and has pores formed in its framework having a polygonal cross section.