Axial-Flow Motor Differential Layout for Compact EV Drive Assembly
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Solution Overview
Problem
Existing drive devices for motor vehicles, particularly cars, face challenges in optimizing construction space and weight while maintaining efficient assembly and reducing the need for laborious connections between components.
Innovation Solution
The integration of a differential transmission, specifically a planetary differential, within the axial flow engine, where rotors are connected via form-fit planetary bolts, allowing for a compact and efficient assembly that eliminates the need for screw connections and optimizes space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a differential transmission is integrated within the axial flow engine using form-fit connections, then construction space and weight are reduced, but assembly complexity increases
Solution Approach 1:
The differential transmission is merged with the axial flow engine by integrating it within the engine housing. The rotor supports serve dual functions as both structural supports for the rotors and as mounting structures for the differential components, combining two separate assemblies into one integrated unit that reduces overall construction space.
Solution Approach 2:
The rotor supports are designed with multi-functionality, serving as both structural supports for the rotors and as mounting structures for the differential transmission components. This universal design allows the same components to fulfill multiple functions, reducing the number of separate parts needed and thereby reducing construction space and weight.
2Weight of moving object
If screw connections are eliminated in favor of form-fit connections, then weight is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Screw connections and other fastening elements are extracted from the design, replacing them with form-fit connections. This removal of unnecessary components reduces weight while the form-fit design ensures proper alignment and connection through precise geometric mating surfaces.
Solution Approach 2:
The mechanical fastening system (screws, bolts, etc.) is replaced with a form-fit connection system that relies on precise geometric interfaces. This substitution eliminates the need for threaded fasteners and their associated holes, reducing weight while requiring high manufacturing precision for the mating surfaces.
3Volume of moving object
If the differential transmission is arranged radially inside the stator, then construction space is optimized, but device complexity increases
Solution Approach 1:
The differential transmission is nested within the radial space inside the stator, utilizing the available radial volume. This nesting arrangement places the differential components within the existing engine structure, optimizing the use of construction space by arranging components in a nested configuration rather than requiring additional external space.
Data Source
AI summary
A drive device for a motor vehicle has an electric engine formed as an axial flow engine, which has a stator and two rotors that can be rotated in relation to the stator. The stator is arranged between the rotors in the axial direction of the axial flow engine. A differential transmission is arranged at least partially radially inside the stator, the differential transmission having a first driven gear non-rotationally connected to a first driven shaft and a second driven gear non-rotationally connected to a second driven shaft. The rotors each have a rotor support, which are connected to one another in a form-fit manner and form a differential housing when seen at least in the axial direction of the electric engine.