Snap Ring Oil Spray Cooling for Driving Motor Stators
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Solution Overview
Problem
Conventional cooling mechanisms for driving motors in electric vehicles face limitations in cooling efficiency due to oil guides causing flow resistance and increased manufacturing costs, with the oil spray being limited to a downward flow and requiring additional assembly processes.
Innovation Solution
A cooling mechanism using a snap ring with integrated oil paths and spray holes to evenly distribute cooling oil onto the stator, eliminating the need for separate oil guides and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an oil guide is used to spray cooling oil onto the stator assembly, then the cooling range is improved, but the device complexity and manufacturing cost increase due to additional components and assembly processes
Solution Approach 1:
The patent integrates the oil guide function directly into the snap ring structure. The snap ring includes a groove that serves as the oil guide passage, eliminating the need for a separate oil guide component. This merging of functions reduces device complexity while maintaining the cooling range improvement, as the snap ring simultaneously performs both the securing function and the oil distribution function.
2Reliability
If an oil guide is used to distribute cooling oil, then the cooling efficiency is improved, but the manufacturing cost and process cost increase due to additional manufacturing and assembly processes
Solution Approach 1:
The oil guide functionality is merged into the snap ring by forming a groove directly on the snap ring structure. This integration eliminates the need for separate oil guide components, reducing the number of manufacturing processes and assembly steps. The cooling efficiency is maintained through the groove design that ensures proper oil distribution, while the manufacturing cost is reduced by simplifying the production process.
3Device complexity
If cooling oil is sprayed from the top onto the stator assembly, then the cooling process is simplified, but the cooling range is limited as the oil flows only downwards due to gravity
Solution Approach 1:
The snap ring groove is designed to divide the cooling oil into multiple flow paths. The groove structure segments the oil flow to reach different areas of the stator assembly, including regions that would not be accessible with simple top-down spraying. This segmentation of the oil flow path expands the cooling range while keeping the overall cooling process simple.
Solution Approach 2:
The snap ring groove structure introduces a radial dimension to the oil flow distribution. Instead of oil flowing only vertically downward, the groove guides oil radially outward to the stator assembly periphery. This dimensional change in oil flow direction enables coverage of previously inaccessible areas, expanding the cooling range without complicating the cooling process.
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
The snap ring-based cooling mechanism enhances cooling efficiency by evenly spraying oil onto the stator, reducing manufacturing costs and process complexity while allowing adjustable spray locations and flow rates.
Implementation Method 1
an oil supply path formed between an outer circumferential surface of the stator and the inner circumferential surface of the motor housing to supply oil to the snap ring, wherein the snap ring includes an oil spray path having an upstream side fluidically communicating with the oil supply path
Implementation Method 2
A third method may be an oil-cooling method of using oil, which is an insulating material, to directly cool the coil inside the motor
Implementation Method 3
the sprayed oil may flow through a coil 15 of the stator assembly 10
Data Source
AI summary
Provided is a driving motor having a cooling mechanism for directly cooling the driving motor by using cooling oil, and more particularly, a cooling mechanism for a driving motor that sprays the cooling oil onto a stator by using a snap ring to secure the stator to a motor housing.