Rotating Impact Damper for Centrifugal Pendulum Wear
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Solution Overview
Problem
Existing centrifugal pendulums in motor vehicle drive trains face challenges in combining efficient damping with a long service life due to limited installation space and the need for a simple structure, leading to issues with wear and damage from adjacent pendulum mass impacts.
Innovation Solution
A centrifugal pendulum with a rotatable stop damper mounted around its own axis, allowing wear distribution over its circumference, and a contact surface that engages with the pendulum mass to rotate the stop damper, preventing one-sided wear and extending the service life by statistically distributing impact points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stop damper is provided to dampen the impact of adjacent pendulum masses, then the damping efficiency is improved, but the service life of the damping element is reduced due to wear and damage
Solution Approach 1:
The stop damper is designed as a ring-shaped element that can rotate around the pendulum mass, dividing the contact surface into multiple segments around its circumference. This segmentation allows different portions of the ring to alternately contact the pendulum mass during rotation, distributing wear across the entire circumference rather than concentrating it at a single point.
Solution Approach 2:
The stop damper is given rotational freedom around the pendulum mass, transforming it from a static component to a dynamic one. During pendulum movement, the stop damper rotates along the contact surface, actively distributing impact points and wear across its circumference. This dynamic behavior extends service life while maintaining damping efficiency.
2Duration of action of stationary object
If the stop damper is made larger to increase wear surface area, then the service life is extended, but the installation space requirement increases
Solution Approach 1:
Instead of increasing the size of the stop damper in the radial direction (which would consume more installation space), the solution utilizes the circumferential dimension by making the stop damper a rotatable ring. This transforms a one-dimensional wear surface into a two-dimensional circumferential surface, significantly increasing the effective wear area without increasing the radial footprint.
Solution Approach 2:
The ring-shaped stop damper is designed to fit around the pendulum mass, utilizing the existing space around the pendulum axis. This nested configuration allows the stop damper to occupy minimal installation space while providing extensive wear surface area through its circumferential geometry.
3Reliability
If a complex damping structure is used to achieve efficient damping, then the damping performance is improved, but the structural complexity increases
Solution Approach 1:
The stop damper is designed to automatically rotate itself during normal pendulum operation through the contact forces generated during pendulum movement. This self-rotating mechanism eliminates the need for external actuation systems, complex control mechanisms, or additional driving components, achieving efficient damping with minimal structural complexity.
Solution Approach 2:
The stop damper serves multiple functions simultaneously: it provides impact damping, distributes wear across its circumference through rotation, and limits the aerial tramway of the pendulum mass. This multi-functionality is achieved through a single simple ring-shaped component rather than multiple separate complex mechanisms.
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 effectively extends the service life of the damping element by evenly distributing wear and preventing rapid wear, ensuring efficient damping of torsional vibrations while maintaining a simple and space-efficient design.
Implementation Method 1
A centrifugal pendulum comprises a pendulum flange, which is mounted so as to be rotatable about an axis of rotation, and a pendulum mass which is movably attached to the pendulum flange in the plane of rotation
Implementation Method 2
the impact can cause wear or damage to the pendulum mass. It is therefore known to provide a shock absorber that dampens the impact of adjacent pendulum masses on the pendulum flange
Data Source
Figure 1~2
AI summary
The invention relates to a centrifugal force pendulum (100) comprising at least one pendulum flange (105) which is mounted in such a way so as to be rotatable about an axis of rotation (110), a pendulum mass (115) which is mounted on the pendulum flange (105) in such a way so as to be movable in the plane of rotation, and an impact damper (135) for limiting a pendulum trajectory of the pendulum mass (115). The impact damper (135) is mounted in such a way as to be rotatable about an axis (140) of its own which is parallel to the axis of rotation (110) of the pendulum flange (105).