Engine Sump Partition Wall for Strainer Bubble Prevention
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Solution Overview
Problem
In internal combustion engines, air often enters the strainer during oil changes and bubbles in the oil can also enter, leading to inefficiencies in the filtration process due to the coaxial arrangement of the oil drain port and strainer.
Innovation Solution
A partition wall is introduced in the sump, with a slope on its lower surface to slow down oil flow and guide it away from the strainer, and a bubble release hole is provided to facilitate the discharge of bubbles, while the strainer is attached to the lower side below the partition wall, and the strainer hole is positioned lower than the slope's uppermost point to prevent bubble entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the oil drain port is arranged coaxially with the strainer, then the structure is simple and easy to manufacture, but air and bubbles can easily enter the strainer during oil changes and oil circulation
Solution Approach 1:
The invention divides the sump into multiple chambers using a partition wall, separating the oil drainage path from the strainer inlet area. This segmentation prevents direct communication between the drain port and strainer, blocking the harmful effect of air and bubble entry while maintaining manufacturing simplicity through modular construction
Solution Approach 2:
The partition wall acts as an intermediary structure between the oil drain port and the strainer. It creates an intermediate chamber that allows oil to pass through while preventing air bubbles from reaching the strainer, thus mediating the interaction between drainage function and filtration protection
2Productivity
If the strainer is positioned at the same level as the oil drain port, then the drainage efficiency is high, but bubbles in the oil can enter the strainer and reduce filtration effectiveness
Solution Approach 1:
The partition wall extends vertically to create a multi-level chamber structure, adding a vertical dimension to the drainage path. Oil flows downward through the partition wall from the upper chamber to the lower chamber, while the strainer remains positioned in the upper chamber, effectively separating the drainage flow path from the filtration inlet in the vertical dimension
Solution Approach 2:
The partition wall is positioned to intercept and redirect oil flow before it reaches the strainer area. By creating a preliminary separation chamber, the system prepares the oil flow path to exclude bubbles before the oil reaches the strainer, ensuring filtration effectiveness is maintained while preserving drainage efficiency
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
This design reduces the likelihood of air and bubbles entering the strainer, allowing for more effective oil filtration by increasing the time oil spends on the partition wall for bubble removal and ensuring efficient drainage.
Implementation Method 1
the lower surface of the partition wall is provided with a slope in a front-rear direction or a left-right direction
Implementation Method 2
increasing the time oil spends on the partition wall for bubble removal
Implementation Method 3
a strainer is provided in a sump... configured to remove foreign substances contained in an oil
Data Source
AI summary
A technique for making air less likely to enter a strainer in an internal combustion engine in which the strainer is supported by a drain bolt. In an internal combustion engine in which a drain bolt supports a strainer and is configured to discharge a drain is attached to a bottom of a sump. A drain hole into which the drain bolt is screwed and a strainer hole are arranged coaxially. A crankcase is provided with an oil passage through which oil is returned to the sump. The oil passage includes a first passage through which the oil flows in a direction away from the strainer, a return passage that turns around from a forefront end of the first passage, and a second passage through which the oil flows from a forefront end of the return passage toward the strainer.