Centrifugal Pendulum Torsional Vibration Damping via Synchronizing Ring
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Solution Overview
Problem
Existing centrifugal pendulum systems inadequately address modern industrial requirements for reducing torsional vibrations, particularly at low speeds and during transient operating states, due to sensitivity to bearing friction and limited deflection angles.
Innovation Solution
A centrifugal pendulum system with a drive ring non-rotatably mounted on a drive shaft and a freely rotatable synchronizing ring, where pendulum bodies are kinematically coupled via a rolling element, allowing non-linear kinematics and tautochronous tuning to effectively damp torsional vibrations across various torque loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If known centrifugal pendulum devices are used for reducing torsional vibrations, then the effect is sensitive to bearing friction and limited by limited pendulum deflection angle, but the device complexity is reduced
Solution Approach 1:
The device is divided into two independent rings: a drive ring mounted on the drive shaft and a synchronizing ring that rotates freely. This segmentation allows the pendulum bodies to be coupled to the synchronizing ring rather than directly to the drive ring, reducing sensitivity to bearing friction while maintaining vibration damping effectiveness.
Solution Approach 2:
The synchronizing ring acts as an intermediary between the drive ring and the pendulum bodies. It mediates the torque transmission and allows the pendulum bodies to move with greater freedom, increasing the deflection angle and reducing friction sensitivity without requiring direct mounting on the drive ring.
2Device complexity
If pendulum bodies are mounted directly on the drive ring, then the structure is simpler, but the maximum deflection angles are limited and bearing friction sensitivity increases
Solution Approach 1:
The synchronizing ring serves as an intermediary component that decouples the pendulum bodies from direct mounting on the drive ring. This allows the pendulum bodies to achieve larger deflection angles while the mounting structure remains relatively simple, as the synchronizing ring handles the complex motion requirements.
3Object-affected harmful factors
If additional measures are taken to enable smooth pendulum braking, then acoustic performance improves, but the device complexity increases
Solution Approach 1:
The system achieves smooth braking through the natural interaction between the rolling bodies and the contours of the synchronizing ring and pendulum bodies. The design inherently provides controlled deceleration without requiring additional active braking mechanisms, maintaining acoustic performance while avoiding increased complexity.
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
The system achieves stable and effective damping of torsional vibrations, especially at low speeds, by shifting the overall inertia and ensuring synchronous movement of pendulum bodies, thereby improving vibration reduction across industrial applications.
Implementation Method 1
A rolling body, in particular a bolt, is used as the coupling element, which is inserted in a freely movable manner in spatially limited contours of the synchronizing ring and the pendulum body. The interaction of the contours and the rolling body, which can roll on the contours, enables (any) non-linear kinematics between the pendulum bodies and the synchronizing ring
Implementation Method 2
The centrifugal pendulum comprises at least one pendulum body movably mounted on the drive ring... when the synchronizing ring rotates relative to the drive ring in a first direction, the coupling element deflects the center of gravity of the pendulum body toward the axis of rotation
Data Source
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AI summary
The invention relates to a centrifugal pendulum (10), in particular for arranging on a drive shaft of an internal combustion engine, comprising a driving ring (12) that can be installed on a drive shaft in a rotationally fixed manner and a synchronizing ring (14) that can rotate freely in relation to the driving ring. The axis of rotation of the driving ring (12) and the axis of rotation of the synchronizing ring (14) are identical. The centrifugal pendulum (10) further comprises at least one pendulum body (16) movably supported on the driving ring (12). The pendulum body (16) is kinematically coupled to the synchronizing ring (14) by means of at least one coupling element (18; 40; 42; 44) in such a way that the coupling element (18; 40; 42; 44) deflects the pendulum body (16) toward the axis of rotation when the synchronizing ring (14) rotates in relation to the driving ring (12) in a first direction.