Split Pendulum Weight Assembly for Space-Limited Flywheels
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Solution Overview
Problem
Existing centrifugal pendulum absorbers face challenges in efficiently damping vibrations in modern, fuel-efficient engines due to limited space for pendulum weights, which are required to be heavy for effective damping but must be mounted in narrow spaces.
Innovation Solution
A pendulum weight design comprising two assemblable portions with bearing surfaces and pockets allows for a larger, more massive weight to be mounted in a flywheel arrangement, maximizing available space and reducing friction through lubrication and a tautochrone curve pendulum path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pendulum weight is made heavy for effective vibration damping, then the vibration damping efficiency is improved, but the available mounting space is exceeded
Solution Approach 1:
The pendulum weight is divided into two separate portions: an inward portion and an outward portion. The inward portion is mounted first within the limited space, and the outward portion is subsequently attached to extend radially outward. This segmentation allows the pendulum weight to achieve greater total mass and volume for effective vibration damping while fitting within the constrained mounting space of the flywheel arrangement.
2Reliability
If the pendulum weight volume is maximized for better damping, then the vibration damping efficiency is improved, but the device complexity increases
Solution Approach 1:
The pendulum weight is divided into two separate portions: an inward portion and an outward portion. The inward portion is mounted first within the limited space, and the outward portion is subsequently attached to extend radially outward. This segmentation allows the pendulum weight to achieve greater total mass and volume for effective vibration damping while fitting within the constrained mounting space of the flywheel arrangement.
Solution Approach 2:
The inward portion of the pendulum weight is pre-mounted and positioned within the flywheel arrangement before the outward portion is attached. This preliminary action ensures proper positioning and alignment, simplifying the subsequent attachment process and reducing overall assembly complexity despite the multi-part design.
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 design enables efficient vibration damping by maximizing the volume and mass of the pendulum weight, reducing friction, and ensuring predictable kinematic behavior, thus improving the durability and effectiveness of the flywheel arrangement.
Implementation Method 1
reducing friction through lubrication
Implementation Method 2
By the trend of reducing fuel consumption, vibrations have become a more common issue in modern vehicles. 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 pendulum weight is thereby configured to be movable along a predetermined pendulum path
Implementation Method 4
The flywheel is used for evening out the 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
A pendulum weight for a centrifugal pendulum absorber for a flywheel of a vehicle includes a bearing surface that, when the pendulum weight is mounted radially outside of a central axis of the pendulum absorber, cooperates with a corresponding bearing surface provided on a separate part of the pendulum absorber, with respect to which separate part the pendulum weight is thereby configured to be movable along a predetermined pendulum path. The pendulum weight further includes a pocket formed in connection with the bearing surface, the pocket being configured to receive at least a portion of the separate part when the pendulum weight moves along the pendulum path. The pendulum weight includes an outward portion and a separate inward portion which are assemblable to form the pendulum weight, the outward portion being configured to be located radially outside of the inward portion with respect to the central axis when mounted.