Flywheel Pendulum Absorber Lubrication for Wear Reduction
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Solution Overview
Problem
Centrifugal pendulum absorbers for flywheels, especially in heavy-duty engines, face durability and reliability issues due to wear and require frequent maintenance, exacerbated by increased engine vibrations in fuel-efficient engines.
Innovation Solution
The centrifugal pendulum absorber design incorporates closed compartments around the flywheel with channels for fluid lubrication, allowing efficient lubrication distribution and reducing wear on pendulum weights, which are positioned in a tautochronic pendulum path, and a separate ring member made of bearing steel for enhanced durability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centrifugal pendulum absorber is used to reduce vibrations from crankshaft, then vibration damping performance is improved, but durability and reliability deteriorate due to wear on moving parts
Solution Approach 1:
A lubricant channel system is introduced as an intermediary between the pendulum weights and the flywheel. The channels distribute lubricant to the contact surfaces, reducing direct friction and wear between moving parts. This mediator (lubricant) protects the mechanical interfaces while allowing the pendulum weights to continue their vibration-dampening motion.
Solution Approach 2:
The patent employs a fluid-based lubrication system where lubricant is circulated through channels in the flywheel and pendulum weights. This hydraulic approach uses fluid pressure and flow to deliver lubrication to critical contact surfaces, reducing wear and improving durability of the moving components.
2Reliability
If multiple closed compartments are provided for pendulum weights, then lubrication efficiency is improved, but device complexity increases
Solution Approach 1:
The flywheel is divided into multiple closed compartments, each housing individual pendulum weights. This segmentation allows independent lubrication of each pendulum weight, ensuring that lubricant is delivered precisely where needed. The segmented structure improves lubrication efficiency while maintaining a relatively simple overall design by using standardized repeating units.
Solution Approach 2:
The lubricant channels are integrated directly into the flywheel structure, merging the lubrication system with the main component rather than adding separate external lubrication mechanisms. This combination reduces the number of separate parts and simplifies the overall device structure while still providing effective lubrication to all compartments.
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 design enhances the durability and reliability of the centrifugal pendulum absorber by efficient lubrication distribution and reduced wear, minimizing maintenance needs and extending service intervals.
Implementation Method 1
by providing the pendulum weights in closed compartments, the pendulum weights can be efficiently lubricated, by e.g. grease, which has shown to improve durability and also reliability during use
Implementation Method 2
Centrifugal pendulum absorbers for flywheels include a number of pendulum weights arranged circumferentially around a center axis of the flywheel, which pendulum weights are movable with respect to the flywheel, thereby dampening vibrations
Implementation Method 3
The flywheel is used for evening out uneven power output from the engine, which is caused by uneven power output from each cylinder of the engine during the cylinder's combustion cycle
Data Source
AI summary
The invention relates to a centrifugal pendulum absorber for a flywheel, including,a plurality of pendulum weights being arranged circumferentially around a center axis of the centrifugal pendulum absorber, wherein,the centrifugal pendulum absorber further including,a plurality of closed compartments which are arranged circumferentially around the center axis, wherein at least one pendulum weight is arranged in each one of the plurality of closed compartments,wherein a channel for fluid is provided at least between two abutting closed compartments, as seen in the circumferential direction, and wherein the channel for fluid fluidly connects the two abutting closed compartments.