Starting Element with Radial Mass Damper Support
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Solution Overview
Problem
Existing starting elements face challenges in efficiently and space-safely arranging multiple components to absorb dynamic forces, leading to increased wear and imbalance issues due to the substantial masses of tuned mass dampers, especially in scenarios with limited bearing play or wear.
Innovation Solution
A starting element design incorporating a two-stage torsional vibration damper and a tuned mass damper, where the tuned mass damper is radially supported on the driven hub via a mass damper support element, and the hydrodynamic coupling device is connected differently to bypass the torsional vibration damper, allowing for efficient damping and torque transmission while minimizing tilting moments and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tuned mass damper with substantial mass is installed to suppress vibrations, then vibration suppression effectiveness is improved, but bearing wear increases and imbalance issues occur due to limited bearing play
Solution Approach 1:
The mass damper support element extends in the radial direction to provide support, changing the support dimension from axial to radial. This radial support configuration prevents tilting moments and reduces bearing wear while maintaining vibration suppression effectiveness.
Solution Approach 2:
The mass damper support element acts as an intermediary component between the mass damper and the driven hub. It provides radial support and prevents direct transmission of tilting moments to the bearings, thereby reducing wear and imbalance issues.
2Area of stationary object
If multiple components (torsional vibration damper, tuned mass damper, hydrodynamic coupling device) are arranged in a compact configuration, then installation space is reduced, but difficulty in absorbing dynamic forces increases
Solution Approach 1:
The hydrodynamic coupling device and tuned mass damper are merged into a single integrated assembly that shares common mounting structures and support elements. This combining reduces the overall installation space while maintaining the dynamic force absorption capabilities of both components through proper structural design.
Solution Approach 2:
The mass damper support element serves multiple functions: it supports the tuned mass damper, provides radial support to prevent tilting moments, and contributes to the overall structural integrity of the assembly. This multi-functionality allows compact arrangement without compromising dynamic force absorption.
3Loss of energy
If the hydrodynamic coupling device is mechanically locked up in lockup mode to prevent flow losses, then energy efficiency is improved, but torsional vibrations in the drivetrain increase
Solution Approach 1:
The tuned mass damper acts as an intermediary vibration suppression device that counteracts torsional vibrations generated in lockup mode. By being coupled to the intermediate transmission arrangement, it actively suppresses vibrations while the hydrodynamic coupling device operates in lockup mode, maintaining energy efficiency.
Solution Approach 2:
The system changes operational parameters by introducing a vibration suppression mechanism that activates specifically in lockup mode. The tuned mass damper's natural frequency is tuned to counteract the torsional vibrations that occur when the hydrodynamic coupling device is mechanically locked up, allowing energy efficiency improvement without excessive vibration.
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 achieves a compact and efficient arrangement that effectively suppresses vibrations and torques, reduces wear, and prevents imbalances by radially supporting the tuned mass damper, thereby enhancing the reliability and longevity of the starting element.
Implementation Method 1
Located between this input element and a driven-side output component are one or more energy accumulators or spring elements, for example coil springs, which can serve to suppress vibrations in the drivetrain
Implementation Method 2
a tuned mass damper operates on the principle that a vibratory system comprising a main mass and an additional mass is so tuned with respect to its natural frequency that at a certain excitation frequency the additional mass, referred to hereinafter as damper weight, carries out a forced vibration
Implementation Method 3
tuned mass dampers, as they are called, are also installed for further enhancement of driving comfort and further suppression of vibrations in the drivetrain
Implementation Method 4
Hydrodynamic coupling elements, i.e., hydrodynamic circuits without torque conversion (hydroclutches) or with torque conversion (hydrodynamic torque converters), are often used for enabling automatic starting
Data Source
AI summary
A starting element has a torsional vibration damper coupleable with a drive with a drive-side input element rotatable against an action of a first spring element and a driven-side output component rotatable against the action of a second spring element arrangement around an axis of rotation. The driven-side output component is coupled with an output of the starting element. A hydrodynamic coupling device has a turbine and a turbine flange connected therewith fixed with respect to rotation. The turbine flange is coupled with the output to be fixed with respect to rotation a first connection. A tuned mass damper a mass damper support element coupled with an intermediate transmission arrangement by a second mechanical connection. The mass damper support element extends opposite to a radial direction perpendicular to the axis of rotation to a component of the output.