Motor Case Assembly With Common Fastener for Compact Drive Units
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Solution Overview
Problem
Existing vehicle drive devices face challenges in securing the capacities of the gear case and electric power conversion unit case while minimizing the physical size, as the use of multiple fastening members increases the space requirements and size.
Innovation Solution
The integration of a common fastening member that concurrently fastens both the gear unit and electric power conversion unit cases to the motor case reduces the total number of fastening members needed, allowing for a more compact design by overlapping flanges and utilizing an extension portion to distribute force evenly, thereby enhancing strength and reducing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple separate fastening members are used to fasten the gear case and electric power conversion unit case to the motor case, then the securement strength is sufficient, but the physical size of the drive device increases and the capacities of the cases cannot be secured
Solution Approach 1:
The patent combines multiple separate fastening members into a single integrated common fastening member that concurrently fastens both the gear case and electric power conversion unit case to the motor case. This merging reduces the total number of fastening members, decreases the space required for fastening operations, and reduces the overall physical size of the drive device while maintaining sufficient securement strength through the unified structure.
Solution Approach 2:
The common fastening member is designed to perform multiple functions simultaneously: it fastens both the gear case and the electric power conversion unit case to the motor case using a single component. This multi-functional design eliminates the need for separate fastening members for each case, thereby reducing the number of parts and the space required for fastening operations.
2Reliability
If multiple separate fastening members are used for fastening cases, then each case can be securely fastened, but the space for disposing fastening members increases
Solution Approach 1:
The patent merges multiple separate fastening members into a single common fastening member that serves both the gear case and electric power conversion unit case. This consolidation reduces the total space required for disposing fastening members while maintaining fastening reliability through the unified structure that concurrently secures both cases to the motor case.
3Volume of moving object
If the total number of fastening members is reduced using a common fastening member, then the physical size is reduced, but the fastening strength may be compromised
Solution Approach 1:
The common fastening member is designed with a structure that preliminarily distributes the fastening force to multiple attachment points on both the gear case and electric power conversion unit case. This preliminary force distribution ensures that reducing the number of fastening members does not compromise overall fastening strength, as the single common member is engineered to handle the combined loading requirements of both cases.
Data Source
AI summary
A drive device including a motor case, a first case, and a second case is provided. The motor case is configured to house a motor. The first case is configured to house a gear unit that is mechanically connected with the motor. The second case is configured to house an electric power conversion unit that is electrically connected with the motor. The first case and the second case are fastened to the motor case by a plurality of fastening members. The plurality of fastening members includes at least one common fastening member that concurrently fastens the first case and the second case to the motor case.