Electric Vehicle Electrical Connection Vibration Stress Reduction
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Solution Overview
Problem
Existing electric vehicle designs do not effectively mitigate stress on electrical connections due to vibration during vehicle travel, as they lack adequate measures to secure these connections.
Innovation Solution
A vehicle design featuring a driving device unit with a frame member and mounting portions, where the electric motor and control device are arranged side by side, and the electrical connection between them is positioned at a joining portion inside a virtual polygon formed by these mounting portions, reducing stress from vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrical connection portion is positioned outside the virtual polygon formed by mounting portions, then ease of connection is improved, but stress resistance due to vibration deteriorates
Solution Approach 1:
The electrical connection portion is positioned at the center of gravity (centroid) of the virtual polygon formed by the mounting portions, creating a balanced position where vibration stresses from all directions are equalized and minimized. This equipotential positioning reduces net stress accumulation on the electrical connection during vehicle operation.
2Ease of repair
If the electrical connection portion is positioned away from the joining portion, then ease of maintenance is improved, but structural stability deteriorates
Solution Approach 1:
The electrical connection portion is positioned both at the joining portion between drive device and control device (providing structural stability) and at the centroid of the virtual polygon (providing vibration resistance). This multi-dimensional positioning satisfies both structural and operational requirements simultaneously.
Data Source
AI summary
A vehicle includes a driving device unit, a frame member supporting the driving device unit, a pair of first mounting portions provided on the frame member and positioned on one side of the driving device unit, and a second mounting portion provided on the frame member and positioned on the other side of the driving device unit. The driving device unit includes a drive device accommodating therein an electric motor, and an electric motor control device which controls the electric motor. The drive device and the electric motor control device are arranged in a horizontal direction. An electrical connection portion electrically connecting the drive device and the electric motor control device is disposed at a joining portion between the drive device and electric motor control device and inside a virtual polygon connecting the at least one pair of first mounting portions and the at least one second mounting portion.