Vibration Absorber with Oscillating Flyweight and Rolling Stops
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Solution Overview
Problem
Current vibration absorption devices in motor vehicle transmissions face challenges in filtering increased engine vibrations due to higher power per cylinder, leading to noise pollution and require more compact designs, while being costly and inefficient in space usage, especially in small-displacement vehicles.
Innovation Solution
A vibration absorption device with a carrier and flyweight system that includes radially outer and inner rolling bodies with stops to limit axial displacement, allowing oscillation with controlled movement, and a support protection mechanism to enhance durability and compactness, integrated into a transmission device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power developed by each cylinder is increased to maintain or increase engine power while reducing cylinder number, then the power per cylinder increases, but the acyclisms of the engine are amplified and generate vibrations that are difficult to filter
Solution Approach 1:
The patent employs dynamic elements including a flyweight that can oscillate and rolling bodies that move along raceways. These dynamic components automatically adjust their positions and movements in response to varying vibration frequencies and amplitudes, enabling the device to effectively filter vibrations across different engine operating conditions while maintaining high power per cylinder
Solution Approach 2:
The invention utilizes parameter changes by allowing the flyweight to vary its oscillation amplitude and frequency in response to engine vibrations. The rolling bodies change their position along the raceways, and the system adapts its mechanical parameters dynamically to match and counteract the vibration spectrum generated by high-power cylinders
2Reliability
If a pendulum oscillator is integrated into the vibration absorption device to improve filtering efficiency, then the filtering capability is enhanced, but the device complexity increases
Solution Approach 1:
The patent merges the pendulum oscillator functionality with the rolling body mechanism into a single integrated system. The flyweight serves both as the oscillating mass and as part of the torque transmission path, while the rolling bodies simultaneously provide guidance and damping. This consolidation achieves effective vibration filtering without proportionally increasing device complexity
3Volume of moving object
If the damping device is made more compact to reduce space between engine and transmission elements, then the space requirement is reduced, but the filtering effectiveness may be compromised
Solution Approach 1:
The patent utilizes radial and axial dimensions efficiently by arranging rolling bodies along raceways that extend in multiple directions. The flyweight oscillates in a plane orthogonal to the transmission axis while maintaining compact axial profile. This multi-dimensional arrangement achieves effective vibration filtering within a compact space suitable for small-displacement vehicles
4Reliability
If stops are added to limit axial displacement of rolling bodies, then the axial movement is controlled and filtering quality is improved, but the device complexity increases
Solution Approach 1:
The stops are designed as integral parts of the existing structure, where the carrier or flyweight itself provides the stopping surfaces. The rolling bodies naturally engage these stops when axial displacement reaches the desired limit, eliminating the need for separate control mechanisms. This self-limiting design improves filtering quality while minimizing additional complexity
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
Improves vibration filtering efficiency, reduces noise pollution, and achieves a compact design suitable for small-displacement vehicles by limiting axial movement and enhancing durability, without significantly increasing the transmission's axial size.
Implementation Method 1
two outer rolling bodies mounted so as to be able to roll and/or slide on at least one of the radially outer support and flyweight raceways and an inner rolling body mounted so as to be able to roll and/or slide on at least one of the radially inner support raceways and flyweight
Implementation Method 2
two outer rolling bodies mounted so as to be able to roll and/or slide on at least one of the radially outer support and flyweight raceways
Implementation Method 3
the inner rolling body and/or the support and/or the flyweight comprise(s) a stop shaped to limit the axial displacement of the inner rolling body by relative to the support and/or to the feeder
Implementation Method 4
pendulum oscillators are known in the prior art comprising flyweights capable of oscillating in a plane orthogonal to the transmission axis
Implementation Method 5
pendulum oscillators are known in the prior art comprising flyweights capable of oscillating
Implementation Method 6
This damping device, usually in the form of a one-piece flywheel, flexible flywheel, or vibration absorber, dampens the effect of engine vibration
Data Source
AI summary
The invention relates to a device (5) for absorbing vibrations, intended for a motor vehicle transmission, having an axis of rotation X and comprising: i. a mounting (10) defining two radially external supporting raceways (431, 432) and one radially internal supporting raceway (37); ii. a counterweight (16) defining a radially internal counterweight raceway (73) and two radially external counterweight raceways (701, 702); iii. two external rolling bodies (191, 192) mounted such as to be able to roll and/or slide on at least one of the radially external supporting (431, 432) and counterweight (701, 702) raceways and an internal rolling body (22) mounted such as to be able to roll and/or slide on at least one of the radially internal supporting (37) and counterweight (73) raceways, such that the counterweight can oscillate freely on the mounting. The mounting comprises a window (25) that passes through the mounting along the body thereof, the counterweight being, regardless of the position thereof, contained in the virtual enclosure having prismatic axis Y, parallel to the X axis, resting on the contour (26, 76) of the window, and projecting axially from the mounting.