Oil Strainer Filter Layout to Prevent Air Intake in Electric Pumps
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Solution Overview
Problem
The existing oil supply devices in vehicles face issues with air pool formation in the strainer, leading to air intake by the electric oil pump and potential delays in oil discharge when the electric oil pump spins idly.
Innovation Solution
The strainer design includes a filter with a region located below the second supply port, where the second supply port is positioned upward relative to the first supply port, and the filter's configuration allows oil to flow from below the supply port, reducing air pool formation and air intake by directing oil flow to push air towards the first supply port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second supply port is positioned at the upper part of the strainer, then the electric oil pump can be supplied with filtered oil, but air pools form around the supply port causing the pump to intake air and spin idly
Solution Approach 1:
The filter is designed with non-uniform structure where a specific region (second region) extends downward below the second supply port to create a localized oil flow path. This local structural variation ensures that oil flows downward past the supply port, preventing air accumulation in that specific area while maintaining the overall upper positioning of the supply port for reliable oil supply.
Solution Approach 2:
Instead of positioning the supply port away from air pools as conventionally done, this invention positions the second supply port upward but counteracts the air accumulation issue by extending the filter downward below the supply port. The oil flow direction is inverted to flow downward past the supply port rather than upward, thus preventing air pockets while maintaining the inverted supply port positioning.
2Object-affected harmful factors
If the filter is extended below the second supply port, then air pool formation is reduced, but the device complexity increases
Solution Approach 1:
The filter is segmented into two distinct regions: a first region that filters oil for the first supply port, and a second region that extends downward to manage air pockets near the second supply port. This segmentation allows each region to perform its specific function efficiently without requiring complete redesign of the entire filter structure.
Solution Approach 2:
The extended second region of the filter serves multiple functions: it continues the filtration process for oil flowing downward, creates a barrier that prevents air from accumulating around the second supply port, and guides oil flow to push air bubbles away. This multi-functionality reduces the need for additional separate components to address air pocket issues.
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 configuration effectively reduces air pool formation around the electric oil pump's supply port, minimizing air intake and ensuring prompt oil discharge, even when the electric oil pump is idle.
Implementation Method 1
the oil filtered by the strainer contains air. The air may move to the upper part of the strainer and form an air pool
Data Source
AI summary
A strainer has an inlet for oil; a filter through which the oil that has flowed in from the inlet passes from inside to outside; a first supply port for supplying, to a first oil pump, the oil that has passed through the filter; a second supply port for supplying, to an intermittently driven second oil pump, the oil that has passed through the filter. The second supply port is located more upward than the first supply port; and the filter has a region located below the second supply port.