Dual Mass Flywheel Centrifugal Pendulum Integration
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Solution Overview
Problem
The increasing robustness of torsional vibration dampers in double clutch transmissions for rough-running internal combustion engines leads to an increase in axial construction space, which complicates the integration of additional components like electric machines and centrifugal force pendulums within the existing clutch chamber.
Innovation Solution
A double clutch transmission system is designed with a wet double clutch, a dual mass flywheel, and a centrifugal force pendulum, where an electric machine is connected to the primary side of the dual mass flywheel, allowing for start-stop functionalities, boosting, and recovery, and is integrated into a dry chamber separate from the clutch chamber, along with the centrifugal force pendulum, which can be either in the dry or wet chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the torsional vibration damper is made more robust for rough-running internal combustion engines, then the vibration damping capability is improved, but the axial construction space increases
Solution Approach 1:
The patent integrates the centrifugal force pendulum inside the dual mass flywheel structure, placing one component within another to save axial space. The CFP is positioned within the hollow interior of the DMF housing, allowing both components to occupy the same spatial envelope without increasing overall axial dimensions.
Solution Approach 2:
The patent transitions from axial arrangement to radial arrangement by positioning the centrifugal force pendulum radially within the dual mass flywheel structure. This dimensional change allows the CFP to utilize the radial space inside the DMF rather than requiring additional axial length.
2Adaptability or versatility
If additional components like electric machines and centrifugal force pendulums are integrated into the clutch chamber, then the functionality is enhanced, but the device complexity increases
Solution Approach 1:
The dual mass flywheel is designed to serve multiple functions simultaneously: it acts as a torsional vibration damper for the engine and as a housing/mounting structure for the centrifugal force pendulum. This multi-functionality reduces the number of separate components needed in the system.
Solution Approach 2:
The patent combines the centrifugal force pendulum and dual mass flywheel into a single integrated assembly, where the CFP is mounted within the DMF structure. This merging of components simplifies the overall device architecture while maintaining enhanced functionality.
3Adaptability or versatility
If the electric machine is connected to the primary side of the dual mass flywheel, then start-stop and boosting functionalities are enabled, but the integration complexity within existing space increases
Solution Approach 1:
The patent separates the transmission system into distinct functional zones: a wet clutch chamber for the double clutch and a dry chamber for the electric machine and dual mass flywheel assembly. This segmentation allows each component to be optimized for its specific function while simplifying the overall integration process.
Solution Approach 2:
The dual mass flywheel acts as an intermediary component between the engine and the transmission, providing a mounting point for the electric machine while maintaining its vibration damping function. This intermediary role facilitates the integration of the electric machine without directly complicating the clutch chamber design.
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 effectively integrates electric machine functionality and vibration isolation components within the existing clutch construction space, enabling efficient use of space and enhancing the capabilities of double clutch transmissions for hybrid vehicles and torque classes up to 400 Nm.
Implementation Method 1
torsional vibration dampers may be provided in the wet chamber to damp torsional vibrations
Implementation Method 2
dual mass flywheel (DMF)
Implementation Method 3
centrifugal force pendulum (CFP)
Implementation Method 4
electric machine that is connected to the primary side of the dual mass flywheel
Data Source
AI summary
A double clutch transmission comprising a wet dual clutch, a dual mass flywheel and a centrifugal force pendulum and an electric motor which is connected to the primary side of the dual mass flywheel.