EV Transmission Oil Strainer Chamber Layout to Prevent Air Suction
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Solution Overview
Problem
The existing power transmission devices for electric vehicles face issues with air suction by the oil pump due to the decrease in oil amount near the suction port, caused by the gear mechanism's rotation, which affects the efficiency of oil filtration and circulation.
Innovation Solution
A power transmission device design that includes a strainer chamber separate from the gear chamber, where the suction port of the strainer is located, reducing the impact of oil scraping by the differential case and allowing for improved oil circulation and reduced air suction by the oil pump.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the strainer is disposed on the outer peripheral side of the gear mechanism, then the layout is simplified, but the oil amount near the suction port decreases causing air suction
Solution Approach 1:
The patent divides the housing into a gear mechanism chamber and a strainer chamber, separating the strainer from the gear mechanism. This segmentation allows the strainer to be positioned in a dedicated chamber where oil can accumulate, preventing air suction while maintaining layout efficiency.
Solution Approach 2:
The patent utilizes the radial dimension by disposing the strainer chamber on the outer peripheral side of the gear mechanism chamber. This dimensional arrangement optimizes space utilization while ensuring proper oil supply to the strainer suction port.
2Device complexity
If the strainer chamber is integrated with the gear mechanism chamber, then the device structure is compact, but oil circulation efficiency decreases
Solution Approach 1:
The housing is segmented into distinct gear mechanism chamber and strainer chamber, allowing independent optimization of each chamber's function. The strainer chamber can be specifically designed for oil accumulation and filtration, while the gear mechanism chamber handles power transmission.
Solution Approach 2:
The patent introduces an oil supply passage as an intermediary connection between the gear mechanism chamber and strainer chamber. This mediator ensures efficient oil circulation from the gear mechanism to the strainer while maintaining functional separation between chambers.
3Reliability
If oil is scraped up by the rotating gear mechanism, then lubrication is maintained, but the oil amount near the suction port decreases
Solution Approach 1:
The patent positions the suction port in a location where oil accumulates before being scraped up by the rotating gear mechanism. This preliminary positioning ensures that the suction port draws oil from a reservoir area, maintaining both lubrication and adequate oil quantity for suction.
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 enhances the oil circulation efficiency, reduces air suction, and improves the layout flexibility within the power transmission device by isolating the strainer chamber from the gear chamber, ensuring effective lubrication and cooling of components.
Implementation Method 1
an oil pump that sucks the oil
Implementation Method 2
A strainer that filters oil to be supplied to the gear mechanism
Implementation Method 3
a gear mechanism connected downstream of the motor
Data Source
AI summary
A power transmission device, includes a motor; a gear mechanism connected downstream of the motor; a pump that sucks oil through a pump inlet; and a box that includes a first chamber accommodating the gear mechanism and a second chamber provided with the pump inlet.