Dual-Circuit Motor Cooling Layout for Independent Wheel Drives
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Solution Overview
Problem
Existing drive devices for vehicles with independent left and right wheel motors face temperature differences due to uneven coolant distribution caused by centrifugal forces during turning, acceleration, or road inclinations, affecting drivability.
Innovation Solution
A drive device with dual circulation circuits for coolant distribution between two motor chambers, ensuring balanced cooling by redirecting coolant flow between chambers using suction and supply ports and pumps, even under varying vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single circulation circuit is used for coolant distribution, then the device complexity is reduced, but temperature difference between motors increases under vehicle turning or acceleration
Solution Approach 1:
The single circulation circuit is divided into two independent circulation circuits, each with its own pump, suction port, and supply port. This segmentation allows independent control of coolant flow to each motor chamber, preventing temperature differences while maintaining manageable system complexity through modular design
Solution Approach 2:
The coolant acts as an intermediary substance that is independently circulated to each motor chamber through separate circulation circuits. The dual circuit system with cross-chamber supply capabilities ensures balanced coolant distribution, suppressing temperature differences between motors during vehicle maneuvers
2Ease of operation
If coolant is allowed to move freely in the casing, then the ease of operation is improved, but temperature difference between motors increases during vehicle maneuvers
Solution Approach 1:
The circulation system is designed to be dynamic, with pumps that can actively respond to changing vehicle conditions. The dual circulation circuit configuration allows the system to adapt coolant distribution in real-time, maintaining balanced temperatures during turns, acceleration, and deceleration while preserving natural coolant flow characteristics
Solution Approach 2:
The system incorporates feedback through the dual circulation circuit design where coolant can be supplied from either chamber to either motor as needed. This creates a self-regulating system that responds to temperature and flow conditions, suppressing temperature differences while maintaining operational flexibility
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
Maintains consistent cooling of both motors, suppressing temperature differences and enhancing drivability by ensuring equal coolant supply regardless of vehicle maneuvers or road conditions.
Implementation Method 1
a first pump configured to feed the coolant under pressure from the first suction port to the first supply port
Implementation Method 2
when the vehicle turns, the coolant in the casing may be biased to one side out of the right and left sides or the front and rear sides under a centrifugal force
Implementation Method 3
it is conceivable to cool each motor by circulating a coolant (typically a lubricating liquid) contained in the casing to each motor
Data Source
AI summary
A drive device for a vehicle includes a first motor connected to one of a left wheel and a right wheel of the vehicle, a second motor connected to the other of the left wheel and the right wheel, a casing, and a first circulation circuit and a second circulation circuit for circulating the coolant in the casing. The casing has a first chamber and a second chamber. The first circulation circuit includes a first suction port provided in the first chamber, a first supply port provided in the second chamber, and a first pump for feeding the coolant from the first suction port to the first supply port. The second circulation circuit includes a second suction port provided in the second chamber, a second supply port provided in the first chamber, and a second pump for feeding the coolant from the second suction port to the second supply port.