Torsional Vibration Damper With Segmented Absorber Masses
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Solution Overview
Problem
Torsional vibration dampers experience intolerable impact noise when centrifugal force acting on absorber masses falls below their weight, causing absorber masses to fall and hit stops, leading to noise issues.
Innovation Solution
The design incorporates absorber mass elements with different radial distances from the central axis, allowing them to hit the stop profile at varying heights and times, reducing noise by distributing the impact and preventing superimposition, with a stop profile that tapers in a wedge shape and stop sensors for enhanced damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If absorber masses are allowed to move freely on the absorber mass carrier, then the torsional vibration damper can effectively dampen vibrations during operation, but impact noise occurs when centrifugal force drops below weight force causing absorber masses to fall and hit stops
Solution Approach 1:
The absorber mass is divided into multiple absorber mass elements (first, second, third elements) arranged at different radial distances from the central axis. This segmentation allows each element to contact the stop at different times during the falling phase, distributing the impact noise temporally and reducing overall noise levels.
Solution Approach 2:
Different absorber mass elements are positioned at different radial distances (first element at greatest distance, second at intermediate distance, third at least distance). This local differentiation in positioning ensures that elements contact the stop sequentially rather than simultaneously, reducing impact noise while maintaining vibration damping effectiveness.
2Object-generated harmful factors
If absorber masses are positioned at different radial distances, then impact noise is reduced by distributing contact timing, but the device complexity increases due to multiple elements and stop profile requirements
Solution Approach 1:
Multiple absorber mass elements are combined on a single absorber mass carrier, and multiple stops are integrated onto one stop profile structure. This merging approach achieves noise reduction through differential positioning while avoiding the complexity of completely separate components for each absorber element.
Solution Approach 2:
The stop profile serves multiple functions: it provides stopping surfaces for multiple absorber mass elements at different radial positions, and its tapered geometry actively contributes to reducing impact noise by ensuring sequential contact. This multi-functionality reduces the need for additional noise-reduction components.
3Object-generated harmful factors
If the stop profile is designed with a tapered geometry, then noise reduction is enhanced through sequential contact of absorber elements, but manufacturing precision requirements increase
Solution Approach 1:
The stop profile employs a tapered geometry where the radial distance varies continuously or in steps along the axial direction. This parameter change in the stop profile shape creates different contact conditions for absorber mass elements at different positions, achieving noise reduction through controlled sequential contact rather than requiring precise positioning of each element.
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 effectively reduces noise by ensuring absorber mass elements hit the stop at different times and with partial weight, minimizing noise impact and enhancing damping properties, even when centrifugal force is less than the weight force.
Implementation Method 1
the effective speed on the hub disc and thus the centrifugal force acting on the absorber masses will drop rapidly when the respective drive, such as an internal combustion engine, is switched off
Implementation Method 2
As soon as the centrifugal force has fallen below the weight, the absorber masses fall down and generate an intolerable impact noise
Data Source
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AI summary
A torsional vibration damper is provided with a damper mass carrier at which is received at least one damper mass that is movable relative to the damper mass carrier and at least one stop. The at least one stop is associated with each stop side of the at least one damper mass. The at least one damper mass and the stop have an extension in extension direction of a central axis. The at least one damper mass has a plurality of damper mass elements in extension direction of the central axis, while the stop has in extension direction of the central axis a stop profile at its side facing the stop sides of the damper mass elements. The stop profile has different radial distances from the central axis in association with the damper mass elements.