Transmission Oil Strainer Rib Layout for Stable Oil Suction
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Solution Overview
Problem
The existing oil strainers for automatic transmissions often cover the discharge hole of the control valve body, leading to oil bypass and reduced suction efficiency, especially when the oil viscosity is high, causing air suction and instability in the oil supply.
Innovation Solution
The oil strainer is designed with a rib projecting on the control valve body side, positioning the suction port and discharge hole mismatched from each other, and the rib extends the moving distance of discharged oil to the suction port, creating a flow in regions with no initial flow, thereby increasing oil intake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the oil strainer is increased in size and arranged to cover the discharge hole of the control valve body, then the total amount of oil passing through the strainer is increased, but the discharged oil bypasses the strainer and returns to the oil pan, reducing suction efficiency
Solution Approach 1:
The invention divides the strainer structure into multiple functional zones by adding ribs that create flow guidance sections. The strainer is segmented into a first strainer section with a first rib and a second strainer section with a second rib, allowing different regions to handle oil flow differently - some oil passes through the strainer while other oil is guided along specific paths, resolving the contradiction between covering the discharge hole and preventing bypass.
Solution Approach 2:
The invention introduces a new spatial dimension by adding ribs that extend in the thickness direction of the strainer. These ribs create three-dimensional flow paths and guide oil along the inner peripheral surface, transforming the two-dimensional filtration problem into a three-dimensional flow management system that simultaneously achieves filtration and prevents bypass.
2Area of stationary object
If the oil strainer covers the discharge hole, then filtration area is increased, but oil return path is blocked causing air suction when oil viscosity is high
Solution Approach 1:
The invention applies different local qualities to different regions of the strainer by positioning ribs at specific locations. The first rib is positioned at a first location and the second rib at a second location, creating localized flow guidance zones that ensure oil returns properly even when the strainer covers the discharge hole, preventing air suction and maintaining reliable oil supply.
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 enhances oil supply to the suction port, reduces air suction, and improves the return of oil to the pan, even in high viscosity conditions, ensuring stable transmission operation.
Implementation Method 1
a moving distance (journey) by which the oil discharged from the discharge hole reaches the oil suction port is extended. The oil flowing toward the oil suction port pulls oil in a nearby region.
Data Source
AI summary
An oil strainer is arranged between an oil pan configured to close a lower opening of a transmission case and a control valve body which is installed in the lower opening. The control valve body has a discharge hole of oil in a portion opposing the oil strainer. The oil strainer has an oil suction port in a portion opposing the oil pan, and has a rib projecting on the control valve body side on a surface of a portion opposing the control valve body. When seen from the oil pan side, the oil suction port and the discharge hole are provided so that positions are not matched from each other. When seen from the oil pan side, the rib is provided to cross a straight line passing through the oil suction port and the discharge hole in a region between the oil suction port and the discharge hole.