Electric Epicyclic Drivetrain for Forward and Reverse Traction
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Solution Overview
Problem
Existing vehicle transmission systems are complex and often require internal combustion engines, lacking simplicity and the ability to operate solely with electric machines in both forward and reverse traction modes.
Innovation Solution
A drivetrain featuring a magnetic-electrical epicyclic transmission stage with an internal rotor, external stator, and modulation ring, connected to electric machines and an energy store, allowing for adjustable rotation direction and operation in both forward and reverse traction modes using only electric machines, thereby simplifying the design and eliminating the need for internal combustion engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional transmission system with mechanical branches and variable branches is used, then torque and speed transmission is achieved, but the structural design becomes complex
Solution Approach 1:
The patent combines the mechanical transmission branch and variable transmission branch into a single magnetic-electrical epicyclic transmission stage. The stator serves dual functions as both a mechanical support element and an electric machine component, merging previously separate systems into one integrated structure that reduces overall complexity while maintaining torque and speed transmission capabilities.
Solution Approach 2:
The stator is designed to perform multiple functions simultaneously: it acts as a mechanical support structure, an electromagnetic component for variable transmission, and a means for controlling output direction. This multi-functionality eliminates the need for separate reverse gear mechanisms and simplifies the overall drivetrain architecture.
2Power
If internal combustion engines are used to power the transmission system, then sufficient power is provided, but the system cannot operate solely with electric machines
Solution Approach 1:
The patent replaces the internal combustion engine with an electric machine (first electric machine) connected to an energy store. The magnetic-electrical epicyclic transmission stage uses electromagnetic fields rather than mechanical combustion processes, enabling the system to operate solely on electrical power while maintaining full transmission functionality.
Solution Approach 2:
The system dynamically adjusts between different operating modes (forward and reverse traction) by controlling the stator's electromagnetic field. This dynamic control capability allows the electrically-powered system to adapt to different operational requirements without needing separate mechanical systems for each mode.
3Adaptability or versatility
If additional reverse gears are added to enable reverse traction mode, then bidirectional operation is achieved, but the number of components and complexity increase
Solution Approach 1:
The stator is designed to provide both forward and reverse traction capabilities through its electromagnetic control. By adjusting the electromagnetic field in the stator, the system can change the direction of power transmission without requiring separate reverse gear mechanisms, thereby achieving bidirectional operation with fewer components.
Solution Approach 2:
The patent extracts the reverse gear function from the traditional mechanical transmission system and integrates it into the magnetic-electrical epicyclic transmission stage. This extraction eliminates the need for separate reverse gear components while maintaining the ability to operate in both forward and reverse modes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables a structurally simpler and less complex drivetrain that can operate fully electrically, reducing the number of components and production costs while providing efficient torque and rotational speed variation, and eliminating the need for additional reverse gears.
Implementation Method 1
a magnetic-electrical epicyclic transmission stage which comprises a rotor, for example an internal rotor, a stator, for example an external stator, and an interposed modulation ring
Implementation Method 2
a magnetic-electrical epicyclic transmission stage which comprises a rotor, for example an internal rotor, a stator, for example an external stator, and an interposed modulation ring
Data Source
AI summary
A drivetrain for a vehicle includes a first electric machine, an input shaft connected to the first electric machine, an output shaft, an energy store connected to the first electric machine, and a magnetic-electrical epicyclic transmission stage having a rotor connected to the input shaft, a stator, and an interposed modulation ring connected to the output shaft. The energy store is connected to the stator such that electrical power can be transmitted from the energy store to the stator, which is operable such that the output shaft is rotatable counter to the direction of rotation of the input shaft, such that the drivetrain can be operated in a forward and a reverse traction mode.