Coaxial Double-Pump Lubrication for EV Drive Cooling
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Solution Overview
Problem
Existing lubricant supply systems for electrically driven motor vehicles are not structurally compact and efficient in providing lubrication and cooling to both the traction motor and traction transmission, often requiring complex setups with multiple pumps.
Innovation Solution
A compact lubricant supply system utilizing a double pump configuration with a common drive actuator, where a pressurized oil pump and a scavenge pump are arranged coaxially and driven by a single electric motor, with a planetary transmission to achieve different drive speeds and volumetric flows, allowing for efficient lubrication and cooling of drive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common lubricant supply with a double pump is used for both traction motor and transmission, then device complexity is reduced, but achieving different volumetric flows for different components becomes more difficult
Solution Approach 1:
The patent combines two pumps (scavenge pump and pressurized oil pump) into a single common drive unit with a shared drive shaft, reducing the number of independent drive mechanisms while maintaining the ability to provide different volumetric flows to different components through the planetary transmission system
Solution Approach 2:
The planetary transmission mechanism enables dynamic adjustment of the drive speeds of the two pumps relative to each other, allowing the system to adapt volumetric flows to different operational requirements while maintaining a unified drive structure
2Volume of moving object
If pumps are arranged coaxially with common drive, then space is saved, but transmission of different drive speeds becomes more complex
Solution Approach 1:
The patent nests the scavenge pump and pressurized oil pump coaxially within a shared housing, with one pump positioned inside or adjacent to the other, maximizing space utilization while maintaining independent drive capabilities through the planetary transmission
3Reliability
If a scavenge pump and pressurized oil pump are used, then lubrication and cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges two functionally distinct pumps (scavenge and pressurized oil pumps) into a single integrated drive unit, maintaining the lubrication efficiency benefits of having both pump types while reducing the number of independent components and simplifying the overall system architecture
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 enables reliable and efficient lubrication and cooling of drive components, reducing friction and temperature control issues, while maintaining a simple and space-saving design, ensuring optimal performance and reliability of the drive train.
Implementation Method 1
with a planetary transmission to achieve different drive speeds and volumetric flows
Implementation Method 2
enables reliable and efficient lubrication and cooling of drive components, reducing friction
Data Source
AI summary
A lubricant supply for a powertrain in an electrically driven motor vehicle has a hydraulic oil pump, which can be driven by a drive actuator, a lubricant supply point and a lubricant reservoir. The hydraulic oil pump can generate a first lubricant volume flow from the lubricant reservoir to the lubricant supply point and a second lubricant flow volume from the lubricant supply point or an additional lubricant supply point in the lubricant reservoir. The drive actuator is an electric motor. The lubricant supply point is arranged in a traction motor with a rotor shaft and a motor housing. The additional lubricant supply location is disposed in a traction transmission. The lubricant supply points can be supplied with lubricant by way of the first lubricant volume flow.