Centrifugal Pendulum Device for Torque Converter Vibration Damping
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Solution Overview
Problem
The damping properties of existing torsional vibration dampers in hydrodynamic torque converters are insufficient, particularly in hydrodynamic torque converters, which can lead to inadequate mitigation of torsional vibrations between the torque converter lockup clutch and the output hub.
Innovation Solution
A hydrodynamic torque converter design that incorporates a centrifugal pendulum device with a pendulum flange having slightly swiveling pendulum masses, non-rotatably connected to the turbine wheel and output hub via rivet elements, and a torsional vibration damper with sequential energy storage elements, enhancing the connection and damping capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional torsional vibration damper is used in the torque converter, then the basic damping function is provided, but the damping properties are insufficient to effectively mitigate torsional vibrations
Solution Approach 1:
The vibration damping function is segmented into two independent systems: a conventional torsional vibration damper for basic damping and a centrifugal pendulum device for enhanced damping. Each system operates independently with its own mounting and structural requirements, allowing the pendulum device to be added without completely redesigning the existing damper structure.
Solution Approach 2:
The centrifugal pendulum device is nested within the converter housing, utilizing the existing spatial envelope of the torque converter. The pendulum masses are contained within the housing volume, and the device integrates with the turbine wheel assembly, effectively nesting the additional damping system within the existing structure without requiring external additions.
2Reliability
If a centrifugal pendulum device is added to improve damping, then the damping properties are enhanced, but the device complexity and structural requirements increase
Solution Approach 1:
The pendulum flange is merged with the turbine wheel and output hub assembly, creating a unified structural unit. The keyed connection integrates the pendulum flange's rotational movement with the turbine wheel's rotation, allowing both components to function together as a single assembly while maintaining their individual damping and power transmission functions.
Solution Approach 2:
The pendulum flange serves multiple functions: it provides the mounting structure for the pendulum masses, acts as a keyed connection element to prevent relative rotation between the pendulum device and turbine wheel, and serves as an axial positioning element between the torsional vibration damper and turbine wheel. This multi-functionality reduces the need for separate components.
3Stability of the object's composition
If the pendulum flange is non-rotatably connected to the turbine wheel and output hub, then the connection stability is improved, but the manufacturing and assembly complexity increases
Solution Approach 1:
The keyed connection acts as an intermediary element between the pendulum flange and the turbine wheel/output hub assembly. This keyed connection provides a simple yet effective mechanism to prevent relative rotation while allowing for straightforward manufacturing and assembly, avoiding the need for complex welding or threading operations.
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 design improves the damping properties and connection between the pendulum flange, turbine wheel, and output hub, providing a more economical and effective solution for mitigating torsional vibrations, thereby enhancing the overall performance of the hydrodynamic torque converter.
Implementation Method 1
A centrifugal pendulum device can be arranged within the converter housing to improve the damping properties of the hydrodynamic torque converter
Implementation Method 2
having a pendulum flange with slightly swiveling pendulum masses
Implementation Method 3
a torsional vibration damper is normally actively arranged in the flow of force between the clutch output of the converter lockup clutch and the output hub
Implementation Method 4
The torsional vibration damper can be designed as a sequential damper having first and second sequentially effective energy storage elements
Implementation Method 5
Hydrodynamic torque converters can, for example, be arranged in a drivetrain of a motor vehicle for transmitting torque between an internal combustion engine and a transmission
Implementation Method 6
a pump wheel connected at the drive side that causes fluid to flow toward a turbine wheel connected to the output side
Data Source
AI summary
A hydrodynamic torque converter comprising a torque converter lockup clutch and a converter housing connected at the drive side, and a pump wheel non-rotatably connected thereto, as well as a turbine wheel non-rotatably connected at the output side to an output hub, and a torsional vibration damper actively arranged between the clutch output of the torque converter lockup clutch and the output hub, and comprising a centrifugal pendulum device arranged within the converter housing and having a pendulum flange with slightly swiveling pendulum masses thereupon, wherein the pendulum flange is arranged axially between the torsional vibration damper and the turbine wheel and is non-rotatably connected to the turbine wheel and the output hub by means of a keyed connection.