Vehicle Drive Wiring Layout for Compact Motor Terminal Assembly
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Solution Overview
Problem
The existing vehicle drive devices face challenges in reducing their size in a direction crossing the axial direction due to the location of the fastening portion between the conductor portion of the terminal device and the connection conductor being radially outward of the stator core.
Innovation Solution
The vehicle drive device includes a rotating electrical machine, a power transmission device, and a case that houses both, with the wiring portion's connection conductor and terminal device positioned radially inward of the stator core, allowing for compact configuration and reduced size by optimizing the fastening positions and wiring layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fastening portion between the conductor portion and connection conductor is located radially outward of the stator core, then the assembly is easier to manufacture, but the device size in the direction crossing the axial direction increases
Solution Approach 1:
The patent relocates the fastening portion from the radial direction (outward of stator core) to the axial direction (at the end face of the stator core). This dimensional shift allows the conductor portion to be fastened to the connection conductor in the axial direction, reducing the device size in the direction crossing the axial direction while maintaining ease of assembly through the same fastening structure
2Device complexity
If the terminal device is positioned radially outward of the stator core, then the electrical connection is simpler to implement, but the space efficiency decreases
Solution Approach 1:
The patent repositions the terminal device from a radial arrangement (outward of stator core) to an axial arrangement (at the end face of the stator core). This dimensional reconfiguration places the fastening portion at the axial end face, improving space efficiency by reducing the footprint in the direction crossing the axial direction while maintaining simple electrical connection through the conductor portion's direct fastening to the connection conductor
Data Source
AI summary
A vehicle drive device includes: a rotating electrical machine; a power transmission device disposed on one side of the rotating electrical machine in an axial direction and configured to transmit power from the rotating electrical machine to wheels; a wiring portion that electrically connects the rotating electrical machine to a power supply; and a case that houses the rotating electrical machine and the power transmission device. The wiring portion includes a connection conductor from the rotating electrical machine, and a terminal device attached to the case on the one side of the rotating electrical machine in the axial direction. The terminal device includes a conductor portion coupled at its lower end to the connection conductor. A coupling portion between the conductor portion and the connection conductor is disposed radially inward of a stator core of the rotating electrical machine as viewed in the axial direction.