Vehicle Transmission Oil Strainer Rib Layout for Noise Reduction
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Solution Overview
Problem
The existing drive power transmission apparatus for vehicles experiences abnormal noise due to air entrainment in the oil, which is sucked by the oil pump from the differential chamber into the oil chamber, causing oil with more air to flow into the oil strainer.
Innovation Solution
The apparatus incorporates a housing case with a first chamber for the oil strainer and a second chamber for the differential gear mechanism, where the suction port of the oil strainer is not surrounded by a rib, and includes a first rib between the suction port and communication port, creating a higher resistance to air-containing oil from the differential chamber from entering the oil strainer, and optionally features a second rib with overlapping ends to promote oil inflow from the differential chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the oil chamber communicates with the differential chamber, then the oil pump can draw oil from both chambers, but air-containing oil from the differential chamber flows into the oil strainer causing abnormal noise
Solution Approach 1:
The patent applies local quality by creating different rib structures at different locations around the suction port. Specifically, a first rib is provided on the differential chamber side with a height that creates higher flow resistance, while other ribs (second, third, fourth ribs) are positioned at different locations with varying heights. This local differentiation allows the system to selectively restrict air-containing oil from the differential chamber while maintaining adequate oil supply from the oil chamber, thus resolving the contradiction between productivity and noise reduction.
2Ease of operation
If ribs surround the suction port, then oil flow is controlled, but air-containing oil from the differential chamber can still enter the oil strainer
Solution Approach 1:
The patent employs asymmetry by designing ribs with different heights at different positions around the suction port. The first rib on the differential chamber side has a specific height that creates asymmetric flow resistance, while the second, third, and fourth ribs have different heights tailored to their respective positions. This asymmetric configuration optimizes oil flow control by creating preferential flow paths that guide clean oil from the oil chamber to the strainer while blocking air-containing oil from the differential chamber, thereby reducing air entrainment while maintaining effective flow 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
This configuration effectively suppresses the flow of air-containing oil from the differential chamber into the oil strainer, reducing noise and ensuring efficient oil filtration by the strainer.
Implementation Method 1
a resistance to suction on the first rib side to be greater than a resistance to suction on the side with no rib
Implementation Method 2
an oil stored in the oil chamber is brought to flow into a suction port of the oil strainer by a suction force of the oil pump
Data Source
AI summary
A drive power transmission apparatus for a vehicle, includes an oil pump, an oil strainer connected to the oil pump, a differential gear mechanism, and a housing case including a first chamber in which the oil strainer is disposed and a second chamber in which the differential gear mechanism is disposed, the second chamber communicating with the first chamber via a communication port, and the oil strainer has a suction port that is not surrounded by a rib, and has a first rib disposed between the suction port and the communication port.