Shared Cooling Jacket for Electric Machine and Transmission
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Solution Overview
Problem
Existing arrangements of electric machines and transmissions in motor vehicles face challenges in achieving structural simplicity and effective cooling, particularly in ensuring that both components are adequately cooled without compromising compactness and sealing.
Innovation Solution
The integration of a cooling water jacket between the electric machine and transmission, positioned annularly around the transmission, which is housed within the electric machine, allowing for a compact axial construction and shared cooling for both components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the transmission is arranged within the electric machine, then the axial construction is compact, but the cooling of both components becomes more difficult
Solution Approach 1:
The patent combines the cooling functions for the electric machine and transmission into a single integrated cooling system. The cooling device includes a cooling water jacket that is arranged to cool both the electric machine stator and the transmission simultaneously, merging what would otherwise require separate cooling systems into one unified approach.
Solution Approach 2:
The cooling water jacket serves multiple functions: it cools the electric machine stator, cools the transmission, and provides structural support as part of the housing. This multi-functional component eliminates the need for separate cooling systems for each component, achieving effective cooling while maintaining compact axial dimensions.
2Temperature
If separate cooling systems are used for the electric machine and transmission, then each component can be cooled effectively, but the device complexity increases
Solution Approach 1:
The patent merges separate cooling systems into a single integrated cooling device. The cooling water jacket is designed to thermally contact both the electric machine stator and the transmission, allowing one cooling system to perform the work of two separate systems, thereby reducing overall device complexity while maintaining effective cooling.
Solution Approach 2:
The cooling water jacket is designed as a universal cooling component that serves multiple cooling needs. It provides thermal management for both the electric machine and transmission through its strategic positioning and thermal contact surfaces, eliminating the need for multiple dedicated cooling systems.
3Device complexity
If the cooling water jacket is integrated into the housing, then structural simplicity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The cooling water jacket is integrated directly into the housing structure, merging the cooling system with the structural component. This integration eliminates separate mounting requirements and simplifies the overall structure, though it does require precise manufacturing of the housing to ensure proper thermal contact and cooling performance.
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 solution provides efficient cooling for both the electric machine and transmission, maintaining a compact design and ensuring effective sealing, thereby enhancing the structural simplicity and operational reliability of the motor vehicle's drivetrain.
Implementation Method 1
a cooling water jacket (15) which is utilized both for cooling the electric machine (6) and for cooling the transmission (4)
Implementation Method 2
The cooling water jacket (15) is integrated into a hollow cylinder (16) that is fixed with respect to a housing (5)
Data Source
AI summary
An arrangement (1) for driving a wheel of a motor vehicle has an electric machine (6) and a transmission (4). The transmission (4) is downstream of the electric machine (6) and is arranged within the electric machine (6). A common cooling device (14) with a cooling water jacket (15) is utilized for cooling both the electric machine (6) and the transmission (4).