Centrifugal Pendulum Damping with Rolling Element Stops
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Solution Overview
Problem
Centrifugal pendulum devices face reliability issues and noise problems due to excessive stress on damping means during high loads, particularly when pendulum masses have a large relative momentum relative to the pendulum flange.
Innovation Solution
The centrifugal pendulum device incorporates a damping means, such as an elastic material forming a damping jacket around the spacer bolt, with limited compression by rolling element contact surfaces, preventing overloading and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the damping means is allowed to deflect freely to dampen spacer bolt impact, then noise is reduced, but the damping means is subjected to excessive stress under high load
Solution Approach 1:
The patent implements a pre-compression arrangement where the rolling element is pre-loaded against the guideway contact surfaces, creating a mechanical stop that limits maximum damping means deflection before excessive stress occurs. This beforehand cushioning prevents the damping means from being overloaded during high-load operations while still allowing sufficient deflection for noise reduction during normal operation.
Solution Approach 2:
The patent changes the operational parameters of the damping means by introducing a defined compression limit through the rolling element-g guideway interaction. This parameter change ensures the damping means operates within optimal deflection ranges, preventing both over-compression (which would reduce reliability) and under-compression (which would reduce noise damping effectiveness).
2Object-generated harmful factors
If the damping means is made softer to reduce noise, then noise reduction improves, but the damping means becomes more susceptible to excessive deflection and stress
Solution Approach 1:
The rolling element acts as an intermediary mechanism between the damping means and the guideway structure. It transmits the limiting function from the rigid guideway to the compliant damping means, allowing the damping means to be softer for better noise reduction while the rolling element prevents excessive deflection that would cause stress damage.
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 solution effectively reduces noise and increases the reliability of the centrifugal pendulum device by limiting the maximum deflection of the damping means, preventing excessive stress and ensuring consistent performance under high loads.
Implementation Method 1
the damping means is formed from an elastic material, it being possible for the elastic material to be an elastomer and/or a plastic and/or a rubber and/or a composite material
Implementation Method 2
the spacer bolt is equipped with a damping means in its axial region reaching through the cutout in the pendulum flange to dampen the spacer bolt striking the cutout
Implementation Method 3
the pair of pendulum masses is guided by means of at least two rolling elements relative to the pendulum flange, and the rolling elements can be rolled in guideways in the pendulum masses and in complementarily shaped guideways in the pendulum flange
Data Source
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AI summary
A centrifugal-force pendulum device having a pendulum flange and at least two pendulum masses fastened on both sides of the pendulum flange by means of a spacer bolt received in a cut-out of the pendulum flange to form a pendulum mass pair, wherein the pendulum mass pair is guided and pivoted in a limited manner with respect to the pendulum flange by means of at least two rolling elements, and the rolling elements are received and roll in guide tracks in the pendulum masses and in complementarily shaped guide tracks in the pendulum flange, and wherein the spacer bolt is equipped, in its axial region which reaches through the cut-out in the pendulum flange, with damping means for damping contact of the spacer bolt against the cut-out, and compression of the damping means is limited by contact of a rolling element against the guide track which receives the rolling element.