Electric Vehicle Motor Unit Support System Longitudinal Fastening
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Solution Overview
Problem
The existing electric motor vehicle designs face challenges in improving the attachment rigidity of the motor unit support system to the motor unit, particularly when a reaction load is input in the vehicle longitudinal direction, while minimizing the size of the support system to avoid obstructing other in-vehicle components.
Innovation Solution
The design incorporates a motor unit support system with a fixed part fastened to the motor unit by a shaft-like fastening member aligned with the vehicle longitudinal direction, and a mounting shaft fixed to the cross member by another shaft-like fastening member also aligned with the longitudinal direction, enhancing attachment rigidity and allowing for easier detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the motor unit support system is enlarged to improve attachment rigidity, then the attachment rigidity improves, but the device complexity and space occupation increase
Solution Approach 1:
The motor unit support system is divided into multiple independent support structures (first support structure and second support structure), each handling specific portions of the reaction load. This segmentation allows the system to achieve high attachment rigidity through distributed support rather than a single large complex structure, reducing overall device complexity while maintaining strength.
Solution Approach 2:
The invention introduces fastening members that extend in the vehicle longitudinal direction (another dimension perpendicular to the motor output shaft axis) to provide additional support. By utilizing this additional dimensional orientation, the system achieves enhanced attachment rigidity without increasing the size of the support structures in the traditional radial directions, thus avoiding obstruction of other in-vehicle components.
2Strength
If the fastening members are aligned with the vehicle longitudinal direction, then the attachment rigidity against reaction load improves, but the ease of manufacture and assembly may be reduced
Solution Approach 1:
The fastening members are merged with the motor unit support structures as integrated components. The support structures and fastening members work together as a unified assembly, where the fastening members are positioned and oriented to extend in the vehicle longitudinal direction. This merging simplifies the overall manufacturing process compared to assembling separate components, as the integrated design reduces the number of discrete parts and assembly steps while maintaining the beneficial longitudinal alignment for reaction load resistance.
Data Source
AI summary
At least one of a pair of right and left motor unit support systems for mounting and supporting a motor unit (71) on a cross member (80) is fastened and fixed to an upper part of the motor unit (71) by a first shaft-like fastening member (a first bolt (101)). An axial direction of the first shaft-like fastening member (the first bolt (101)) is the same as a vehicle longitudinal direction in a state in which the at least one of the motor unit support systems is fastened and fixed to the upper part of the motor unit (72).