Centrifugal Pendulum Coupling for Torsional Vibration Isolation
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Solution Overview
Problem
Centrifugal pendulum devices face challenges in synchronizing pendulum masses due to variable spring force during oscillations, leading to reduced restoring torque and worsened torsional vibration isolation, especially at large swing angles, where leverage ratios and force vectors become unfavorable.
Innovation Solution
A centrifugal pendulum mechanism with a coupling element that maintains constant distance to the crankshaft axis during oscillations and rotates relative to the pendulum masses, ensuring synchronization only during asynchronous movement, thus minimizing interference and noise, and using a ring element or radially protruding arms for coupling with low-friction bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a spring element is used as a synchronizing device between pendulum masses, then the pendulum masses can be synchronized, but the spring force becomes variable during oscillation, reducing the restoring torque and worsening torsional vibration isolation
Solution Approach 1:
The patent introduces a coupling element with isoradial points as an intermediary mechanism between pendulum masses. This coupling element mediates the synchronization by providing a constant-distance connection point that does not vary with oscillation angle, thereby avoiding the variable spring force problem while still achieving synchronization of the pendulum masses.
2Stability of the object's composition
If the coupling element rotates relative to the pendulum masses to achieve synchronization, then synchronization is possible, but unfavorable leverage ratios and force vectors occur at large swing angles, leading to jamming or disturbance
Solution Approach 1:
The patent applies local quality by designing the coupling element to act specifically at the isoradial points of the pendulum masses. This localized coupling at the constant-radius position ensures that synchronization is achieved without the coupling element interfering with the pendulum masses during their oscillation, avoiding unfavorable leverage ratios and force vectors that would cause jamming or disturbance.
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 mechanism allows for synchronous oscillation of pendulum masses without affecting the oscillation order, reducing noise and enhancing restoring torque, even under disruptive external influences, by ensuring the coupling element's effect is only active during asynchronous movement and not during synchronous operation.
Implementation Method 1
the pendulum masses being able to oscillate about a zero position with a predetermined oscillation angle (a) in the centrifugal force field of the flange element in relation to the at least one flange element by means of the pendulum bearings formed from roller elements rolling on guide tracks
Implementation Method 2
the pendulum masses being able to oscillate about a zero position with a predetermined oscillation angle (a) in the centrifugal force field of the flange element
Implementation Method 3
with the coupling element acting on the respective pendulum mass at an isoradial point, which remains at the same radial height during a pendulum and rotational movement of the pendulum masses
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a centrifugal force pendulum device (1) having at least one flange element (3) which can be rotated about a rotational axis, is arranged on the drive side, and on which pendulum masses (4) are arranged as flyweights in a manner which is articulated such that they can be moved, wherein the pendulum masses (4) are arranged distributed over the circumference on the at least one flange element (3) and are mounted on the at least one flange element (3) by means of pendulum bearings (5), wherein the pendulum masses (4) can swing with respect to the at least one flange element (3) in the centrifugal force field of the flange element (3) about a zero position with a predefined swing angle (a) by means of the pendulum bearings (5) which are formed from roller elements (7) which roll in each case on guide tracks (6) of the at least one flange element (3) and the pendulum masses (4), and are suspended such that they can be rotated partially about their centroid (S) during a pendulum movement, and wherein the pendulum and rotational movement of the pendulum masses (4) is predefined by way of the configuration of the guide tracks (6) and the coupling element (10), wherein the pendulum masses (4) are coupled to one another by way of a coupling element (10), wherein the coupling element (10) acts on the respective pendulum mass (4) at an isoradial point (11) which remains at the same radial height during a pendulum and rotational movement of the pendulum masses (4), wherein the respective spacing of the isoradial points (11) of the respective pendulum masses (4) also remains constant relative to one another.