Segmented Drive Housing Assembly for Lighter EV Powertrains
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Solution Overview
Problem
The existing drive device structures for electric vehicles face challenges in reducing weight and complexity due to the increased number of housing divisions and weight, particularly when integrating motor and transmission mechanisms, which complicates assembly and maintenance.
Innovation Solution
A drive device design that incorporates a motor housing and a transmission housing with a partition wall, where the motor housing is divided into multiple sections fixed with bolts, allowing for separate assembly and maintenance without additional components, and utilizing a refrigerant flow path that extends radially to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the motor housing and transmission housing are integrated as a single structure, then the overall structural integrity is improved, but the weight and complexity of the drive device increase
Solution Approach 1:
The housing is divided into multiple sections (first housing, second housing, third housing, fourth housing) that can be separately manufactured and assembled. The motor housing includes first and second housings, while the transmission housing includes third and fourth housings, allowing for modular construction that reduces overall weight while maintaining structural integrity through bolt connections.
2Weight of moving object
If the housing is divided into multiple sections, then the weight and complexity are reduced, but the assembly and maintenance difficulty increases
Solution Approach 1:
The housing is segmented into four separate housings that can be independently manufactured and assembled. This modular design allows for easier maintenance and repair of specific components without disassembling the entire drive device, as each housing section can be accessed and serviced independently.
Solution Approach 2:
The bolt holes and through-holes are pre-positioned in each housing section during manufacturing, allowing for rapid assembly without complex alignment procedures. The standardized bolt connection system enables quick assembly and disassembly operations.
3Stability of the object's composition
If additional bolts and through-holes are added for housing connections, then the structural stability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The connection system is designed with standardized bolt holes and through-holes in each housing section, allowing for modular assembly. The bolts pass through predetermined through-holes in one housing and secure to bolt holes in the adjacent housing, creating a stable connection without requiring complex fastening mechanisms.
Solution Approach 2:
The motor housing and transmission housing are merged into a single integrated structure through the bolt connection system. The first housing connects to the second housing, and the third housing connects to the fourth housing, with the transmission housing fixed to the motor housing, creating a unified assembly that maintains structural stability while using simple connection elements.
Data Source
AI summary
A transmission housing of a drive device is fixed to one side in an axial direction of a motor housing that includes a first housing and a second housing fixed to another side in the axial direction of the first housing. The transmission housing includes a third housing fixed to the first housing and a fourth housing fixed to one side in the axial direction of the third housing. A bolt fixing the first and second housings passes through a through-hole of the second housing from the another side in the axial direction, and is fixed to a bolt hole of the first housing. A bolt fixing the second and third housings passes through a through hole of the first housing from the another side in the axial direction, and is fixed to a bolt hole of the third housing.