Split Flywheel with Centrifugal Pendulum for Vibration Damping
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Solution Overview
Problem
Existing flywheel technologies for motor vehicle drive trains fail to effectively address axial mobility, deformation compensation, axial vibration damping, and torsional vibration eradication, leading to critical stresses and rotational irregularities.
Innovation Solution
A flywheel design incorporating a centrifugal pendulum device with a pivoting axis and an axial spring device, featuring a first and second flywheel part that are rotatable and axially elastically displaceable, along with a centrifugal pendulum mass carrier part that displaces pendulum masses under centrifugal force, to mitigate torsional vibrations and allow for axial mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rigid flywheel structure is used, then manufacturing precision is improved, but axial mobility and deformation compensation are lost
Solution Approach 1:
The flywheel is divided into two separate flywheel parts (first flywheel part and second flywheel part) that can move axially relative to each other. This segmentation allows each part to maintain manufacturing precision while the relative movement between parts provides the necessary axial mobility and deformation compensation.
Solution Approach 2:
The spring device introduces dynamic axial movement capability between the two flywheel parts. Instead of a rigid fixed structure, the spring allows controlled axial displacement that adapts to deformation requirements while maintaining rotational stability.
2Adaptability or versatility
If axial mobility is introduced through spring devices, then deformation compensation is improved, but axial vibration damping is worsened
Solution Approach 1:
The spring device acts as an intermediary element between the two flywheel parts. It mediates the axial forces by providing both the necessary mobility for deformation compensation and inherent damping characteristics to reduce axial vibrations transmitted through the flywheel structure.
3Device complexity
If a single rigid flywheel structure is used, then device complexity is reduced, but torsional vibration eradication is worsened
Solution Approach 1:
The flywheel is segmented into two parts connected by a spring device, creating a torsionally flexible structure. This segmentation allows the two parts to move independently in the axial direction, effectively counteracting torsional vibrations while maintaining relatively simple overall structure.
Solution Approach 2:
The spring device introduces controlled mechanical compliance that creates opposing vibrational movements between the two flywheel parts. This mechanical vibration mechanism actively counteracts torsional vibrations from the crankshaft through the relative axial movement of the segmented structure.
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 solution enables axial mobility, compensates for deformations, dampens axial vibrations, and eliminates torsional vibrations, thereby preventing critical stresses and reducing rotational irregularities in motor vehicle drive trains.
Implementation Method 1
an axial spring device acting between the first flywheel part and the second flywheel part
Implementation Method 2
a centrifugal pendulum device with a pivoting axis and a pendulum mass arranged displaceably on the pendulum mass carrier part under the action of centrifugal force along an arc-shaped path
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a flywheel (100), in particular for a powertrain of a motor vehicle driven by an internal combustion engine, the flywheel (100) having a first flywheel part (104), a second flywheel part (106) and an axial spring device (108) that is active between the first flywheel part (104) and the second flywheel part (106). In order to improve the construction and/or functionality of the flywheel (100), said flywheel (100) has a centrifugal pendulum device (102) comprising a pendulum mass support part (122) and at least one pendulum mass (124) arranged on the pendulum mass support part (122) such that it can be displaced, under centrifugal action, along a pendulum path.