Vehicle Drive Unit Cooling Layout for Motor and Oil Heat Control
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Solution Overview
Problem
The existing vehicle driving device has a structure where cooling water primarily cools the upper and side surfaces of the rotary electrical machine, leading to inadequate cooling of the oil stored in the case, which in turn may result in insufficient cooling of the rotary electrical machine.
Innovation Solution
The vehicle driving device includes a case with a first accommodating chamber for the rotary electrical machine, a second accommodating chamber for the inverter module, and a division wall dividing the two chambers. An oil storage portion is formed in the lower portion of the first accommodating chamber, and a first water passage for cooling water flows through the second accommodating chamber. A second water passage connected to the first water passage is provided in a region facing the lower surface of the rotary electrical machine, allowing for effective cooling of both the inverter module and the rotary electrical machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling water flows through a water passage between the bottom portion of the second accommodating chamber and the inverter module to cool the inverter module, then the inverter module is cooled, but the rotary electrical machine cannot be sufficiently cooled because the cooling water only cools the upper surface and side surface via the case
Solution Approach 1:
The water passage is segmented into multiple sections: a first section in the second accommodating chamber for cooling the inverter module, and a second section extending into the first accommodating chamber for cooling the rotary electrical machine. This segmentation allows the cooling water to serve multiple cooling functions sequentially, resolving the contradiction between cooling the inverter module and the rotary electrical machine effectively
Solution Approach 2:
The water passage is designed to perform multiple cooling functions: it cools the inverter module through its first section, then continues to cool the rotary electrical machine through its second section that extends into the first accommodating chamber. This multi-functionality allows a single cooling system to address both cooling requirements simultaneously
2Temperature
If the cooling water cools the rotary electrical machine via the case, then the upper surface and side surface are cooled, but the oil stored in the case cannot be cooled
Solution Approach 1:
The cooling water acts as an intermediary that directly contacts the rotary electrical machine through the extended water passage, transferring heat more efficiently than through the case wall alone. This direct contact mechanism enables effective cooling of both the machine surfaces and the surrounding oil
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 ensures that the inverter module and the rotary electrical machine are appropriately cooled, while also effectively cooling the oil stored in the case, thereby enhancing the overall cooling efficiency of the vehicle driving device.
Implementation Method 1
cooling water for cooling the inverter module
Implementation Method 2
cooling water flows through a water passage
Implementation Method 3
second water passage connected to the first water passage is provided in a region facing a lower surface of the rotary electrical machine
Implementation Method 4
cooling water flows through the second water passage
Implementation Method 5
effectively cooling the oil stored in the case
Data Source
AI summary
A vehicle driving device includes: a rotary electrical machine; an output member configured to be drivingly coupled to a wheel; a power transmission mechanism configured to transmit a driving force between the rotary electrical machine and the output member; an inverter module configured to control driving of the rotary electrical machine; and a case configured to accommodate the rotary electrical machine, the power transmission mechanism, and the inverter module. The case includes a first accommodating chamber in which the rotary electrical machine is accommodated, a second accommodating chamber in which the inverter module is accommodated, and a division wall dividing the first accommodating chamber and the second accommodating chamber. An oil storage portion configured to store oil is formed in a lower portion of the first accommodating chamber.