Electric Axle Power Transmission Layout for Dual Driveshaft Packaging
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Solution Overview
Problem
Commercial vehicles with electric axles require different specifications for multi-driveshaft and single driveshaft configurations, leading to increased development and manufacturing costs, as well as packaging and servicing challenges due to the complexity of multiple components.
Innovation Solution
A power transmission device with a propeller shaft connecting a first rear-wheel driveshaft to a second rear-wheel driveshaft, allowing a single motor to drive both driveshafts, reducing the number of components and improving packaging space and assembly convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple motors and reducers are connected to multiple driveshafts, then each driveshaft can be independently powered, but the device complexity and packaging space requirements increase
Solution Approach 1:
The patent combines multiple power transmission functions into a single integrated electric axle unit. Instead of having separate motors and reducers for each driveshaft, one electric axle contains both motors and reducers, which share common components like the housing and control system. This merging approach maintains the ability to power multiple driveshafts while significantly reducing the total number of discrete components and simplifying the overall system architecture.
Solution Approach 2:
The electric axle is designed as a multi-functional unit that can simultaneously drive multiple driveshafts (first rear-wheel driveshaft and second rear-wheel driveshaft) through a single integrated structure. The universal design allows the same electric axle assembly to serve multiple power transmission functions, eliminating the need for separate motor-reducer combinations for each driveshaft and thereby reducing device complexity.
2Reliability
If multiple motors and reducers are connected to multiple driveshafts, then each driveshaft can be independently powered, but the packaging space requirements increase
Solution Approach 1:
The patent merges multiple motor-reducer assemblies into a single compact electric axle unit. By combining the housing, control systems, and mechanical components into one integrated structure, the total packaging space required is significantly reduced compared to having separate motor-reducer combinations for each driveshaft. The shared components eliminate redundant space requirements.
3Adaptability or versatility
If different specifications are used for multi-driveshaft and single driveshaft configurations, then each configuration can be optimized, but the manufacturing costs increase
Solution Approach 1:
The electric axle is designed as a universal platform that can accommodate both multi-driveshaft and single driveshaft configurations. The standardized housing, motor, and reducer assembly can be configured to drive one or multiple driveshafts depending on the application requirements. This universality allows the same basic design to be manufactured for different vehicle types, significantly reducing development and manufacturing costs while maintaining configuration adaptability.
Data Source
AI summary
A power transmission device for a commercial vehicle having an electric axle, may include a first differential ring gear fixedly mounted on a first rear-wheel driveshaft; a second differential ring gear mounted on a second rear-wheel driveshaft; a propeller shaft, with a first differential drive gear engaged with the first differential ring gear being connected to a front-end portion of the propeller shaft and a second differential drive gear engaged with the second differential ring gear being connected to a rear end portion thereof; a reducer connected to the first differential ring gear or the propeller shaft; and a motor, an output shaft of the motor being connected to an input gear of the reducer.