Hybrid Drive Assembly With Epicyclic Gear NVH Decoupling
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Solution Overview
Problem
Hybrid drive assemblies in vehicles face challenges in reducing torsional vibrations from internal combustion engines and electromechanical energy converters, leading to unfavorable noise, vibration, and harshness (NVH) behavior, which affects travel comfort and efficiency.
Innovation Solution
Incorporating a switchable traction gear device with epicyclic gear mechanisms and torsional vibration reduction devices for both drive shafts, allowing for selective connection and decoupling of drive power between the internal combustion engine and electromechanical energy converter, and using additional electromechanical energy converters in the drive train to manage vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If torsional vibration reduction devices are added to both drive shafts, then NVH behavior is improved, but device complexity increases
Solution Approach 1:
The patent introduces torsional vibration reduction devices as intermediary elements between the drive machines and the traction gear device. These devices act as mediators that absorb and reduce torsional vibrations while allowing power transmission, thereby improving NVH behavior without requiring complete redesign of the entire drive system.
Solution Approach 2:
The patent segments the vibration reduction function into separate devices for the first drive shaft and second drive shaft. This segmentation allows each vibration reduction device to be optimized independently for its specific drive machine, improving overall NVH performance while maintaining manageable system complexity through modular design.
2Adaptability or versatility
If a switchable traction gear device with epicyclic gear mechanisms is used, then operating versatility is improved, but device complexity increases
Solution Approach 1:
The traction gear device is designed with multi-functionality to handle various operating modes including electric-only drive, combustion engine-only drive, and combined drive modes. The epicyclic gear mechanisms and switchable connections allow a single device to perform multiple functions, improving operating versatility while avoiding the need for separate transmission systems for each drive mode.
Solution Approach 2:
The patent implements dynamic switching capabilities in the traction gear device, allowing the connection between drive machines and the epicyclic gear mechanisms to be selectively engaged or disengaged based on operating conditions. This dynamic adaptability enables the system to optimize performance for different drive modes without requiring multiple fixed transmission systems.
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
This configuration significantly improves NVH behavior by reducing torsional vibrations, enabling efficient and comfortable operation of hybrid drive vehicles, particularly by using epicyclic gear devices and torsional vibration reduction mechanisms to isolate and decouple vibrations effectively.
Implementation Method 1
a first torsional vibration reduction device (3) arranged between them. With the first torsional vibration reduction device (3), the torsional vibrations brought about in particular by the internal combustion engine can be reduced
Implementation Method 2
switchable traction gear device (5) in particular in the form of an epicyclic gear device
Data Source
AI summary
A hybrid drive assembly includes an internal combustion engine as a first drive machine having a first drive shaft, an electromechanical energy converter as a second drive machine having a second drive shaft, a switchable traction transmission device with a first transmission input shaft selectively connected to the first drive shaft, and a second transmission input shaft connected to the second drive shaft. The traction transmission device has an input planetary gear set having at least three transmission shafts, an input sun gear shaft, an input ring gear shaft, and an input planet carrier shaft. One of which is the first transmission input shaft, with a first torsional vibration reducing device arranged between it and the first drive shaft. Another of which is the second transmission input shaft, with a second torsional vibration reducing device arranged between it and the second drive shaft.