EV Power Transmission Oil Pump Inlet Layout Against 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 decreased oil levels near the suction port, especially when the gear mechanism rotates and oil is scraped up.
Innovation Solution
A power transmission device configuration that includes a motor, a gear mechanism, a drive shaft, an oil pump, and a plate with a facing surface adjacent to the gear mechanism. The pump inlet is positioned adjacent to the plate's back surface, reducing air suction by maintaining oil levels near the suction port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump inlet is disposed away from the gear mechanism to avoid oil contamination, then the pump protection is improved, but the oil suction efficiency decreases
Solution Approach 1:
The oil supply system is segmented into distinct functional zones: the gear mechanism area with the strainer, the oil storage chamber, and the suction port area. This segmentation allows the pump inlet to be positioned optimally for both protection from contamination and efficient oil suction, as each zone performs its specific function independently.
Solution Approach 2:
The oil storage chamber is positioned to receive and store oil from the gear mechanism before it reaches the suction port. This preliminary action of oil collection and storage ensures that the suction port always has adequate oil available, maintaining high suction efficiency while the pump remains protected from direct exposure to contaminated oil.
Data Source
AI summary
A power transmission device, includes a motor; a gear mechanism connected downstream of the motor; a drive shaft connected downstream of the gear mechanism and disposed passing through an inner periphery of the motor; a pump that sucks oil through a pump inlet; and a plate that includes a facing surface facing the gear mechanism in an axial direction. The pump inlet is disposed adjacent to the plate on a back surface side of the facing surface.