Vehicle Drive Layout With Multi-Axis Gearing for Shorter Axial Length
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Solution Overview
Problem
The existing vehicle drive devices face a challenge in reducing their axial dimension due to the coaxial arrangement of key components such as the input member, disconnection engagement device, distribution differential gear mechanism, and distribution output gear.
Innovation Solution
The vehicle drive device is configured with the distribution differential gear mechanism, first distribution output gear, and disconnection engagement device disposed on a first axis, while the rotary electric machine and its drive gear are on a second axis, and the transmission engagement device is on a third axis, allowing for a non-coaxial arrangement that reduces the axial dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distribution differential gear mechanism, first distribution output gear, and disconnection engagement device are arranged coaxially on the same axis, then the structural alignment and power transmission efficiency are improved, but the axial dimension of the vehicle drive device increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from a single-axis coaxial arrangement to a multi-axis spatial distribution. Specifically, the distribution differential gear mechanism is arranged on a first axis, the rotary electric machine on a second axis, and the transmission engagement device on a third axis. This spatial redistribution significantly reduces the axial dimension of the overall drive device while maintaining functional integrity and power transmission efficiency through three-dimensional layout optimization
2Device complexity
If the rotary electric machine and rotary electric machine drive gear are disposed on the same axis as the distribution differential gear mechanism, then the power transmission path is simplified, but the axial space requirement increases
Solution Approach 1:
The patent resolves this contradiction by distributing components across multiple axes rather than concentrating them on a single axis. The rotary electric machine and its drive gear are positioned on a second axis that is distinct from the first axis carrying the distribution differential gear mechanism. This multi-axis arrangement simplifies the power transmission path within each axial plane while simultaneously reducing the overall axial dimension by utilizing radial and lateral space more efficiently
3Ease of manufacture
If all engagement devices and gear mechanisms are arranged on a single axis, then the structural alignment is simplified, but the packaging efficiency decreases
Solution Approach 1:
The patent achieves improved packaging efficiency through three-dimensional spatial distribution of components. The disconnection engagement device is positioned on a first axis, while the transmission engagement device is positioned on a third axis, and the rotary electric machine on a second axis. This multi-axis configuration allows for better utilization of available space, reducing the overall footprint and improving packaging efficiency while maintaining straightforward structural alignment within each axial plane through modular component design
Data Source
AI summary
A transmission mechanism transmits rotation transmitted from a distribution differential gear mechanism to an output member. The distribution differential gear mechanism, a first distribution output gear, and a first engagement device are disposed on a first axis. A first rotary electric machine and a first rotary electric machine drive gear are disposed on a second axis. A transmission engagement device of the transmission mechanism is disposed on a third axis. An axial direction of the first rotary electric machine includes a first axial side where the first rotary electric machine is disposed with respect to the first rotary electric machine drive gear, and a second axial side opposite to the first axial side. The distribution differential gear mechanism is disposed on the second axial side of the first distribution output gear and the first engagement device.