Pendular Damping Device Center of Gravity Shift
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Solution Overview
Problem
Existing pendulum damping devices for motor vehicle transmissions face limitations in stability and mass due to the center of gravity being radially inside the contact regions between pendulum masses and rollers, restricting their efficiency and effectiveness.
Innovation Solution
The design shifts the center of gravity radially outside the contact regions by adding lateral parts to the pendulum mass, allowing for increased mass and stability, with a symmetrical and balanced structure, and incorporating concave regions for rollers and elastically deformable stop means for improved operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the center of gravity is positioned radially inside the contact regions between pendulum masses and rollers, then the device structure is simpler, but the stability of pendulum masses deteriorates causing tilting out of the radial plane
Solution Approach 1:
The center of gravity is shifted from the radial dimension to the axial dimension by extending lateral parts axially outward from the central part. This dimensional transition allows the center of gravity to be positioned outside the contact regions without increasing radial dimensions or complicating the rolling contact mechanism, thereby improving stability while maintaining structural simplicity.
2Quantity of substance
If the mass of pendulum masses is increased to improve damping efficiency, then the damping effectiveness improves, but the space required increases requiring redesign of the device
Solution Approach 1:
Instead of increasing mass by expanding radial dimensions which would conflict with existing contact regions, the invention extends mass laterally in the axial dimension. This allows significant mass increase through lateral parts that extend axially outward, improving damping efficiency without requiring redesign of the radial support structure or contact regions.
3Stability of the object's composition
If lateral parts are added to shift the center of gravity outward, then the stability and mass increase, but the device structure becomes more complex
Solution Approach 1:
The pendulum mass is segmented into a central part and lateral parts that can be designed and manufactured separately then assembled. This segmentation allows the lateral parts to be optimized for stability without complicating the central rolling contact mechanism, and enables modular manufacturing and assembly while achieving the desired center of gravity position.
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 configuration enhances the stability and effectiveness of the pendulum masses by increasing their mass and optimizing the center of gravity position, leading to improved damping of vibrations and rotational irregularities in motor vehicle transmissions.
Implementation Method 1
at least one pendulum mass, a central part of which is mounted movably on a support capable of pivoting around an axis
Implementation Method 2
pendulum damping device
Implementation Method 3
at least one roller mounted radially between the radially outer periphery of the central part and a radially outer part of the support
Data Source
AI summary
A pendulum damping device for a motor vehicle transmission, having at least one pendulum mass (33), a central part (33a) of which is mounted movably on a support (26) capable of pivoting around an axis, and having at least one roller (36) mounted radially between the radially outer periphery of the central part (33a) and a radially outer part of the support (26), in such a way that during operation, the central part (33a) of the pendulum mass (33) abuts radially outwardly against the roller (36), the latter (36) in turn abutting radially outwardly against the support (26). The pendulum mass (33) comprises at least one lateral part (33b) fastened to the central part (33a) and designed so that the center of gravity of the pendulum mass (33) is situated radially outside the contact regions between the central part (33a) of the pendulum mass (33) and the roller (36).