Pendulum Raceway Layout for Torsion Vibration Damping
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Solution Overview
Problem
Existing pendulum damping devices for motor vehicle transmission systems require complex and costly raceways to facilitate combined movement of pendulum bodies, which complicates production and integration into systems like dual mass flywheels and torque converters.
Innovation Solution
A pendulum damping device with a support that rotates about an axis and at least one pendulum body, guided by rolling components cooperating with raceways where one defines an arc of a circle and the other a different form, such as an Archimedean spiral, allowing for simplified production and easier integration into motor vehicle transmission systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex free-form raceways are used to guide combined movement of pendulum bodies, then the damping effectiveness is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The raceway guidance system is segmented into two distinct components: a first raceway with a simple circular arc profile and a second raceway with the complex free-form profile. This segmentation allows the simple circular arc raceway to be easily manufactured while the complex motion guidance is achieved through the combination of both raceways, resolving the contradiction between damping effectiveness and manufacturing ease.
Solution Approach 2:
Instead of making both raceways complex to achieve combined movement, the invention inverts the approach by making one raceway simple (circular arc) and the other complex (free-form). The simple circular arc raceway provides easy manufacturing and basic guidance, while the complex free-form raceway compensates to achieve the desired combined pendulum motion, thus resolving the manufacturing complexity issue.
2Reliability
If complex free-form raceways are used to guide combined movement of pendulum bodies, then the vibration filtering capability is improved, but the device complexity increases
Solution Approach 1:
The guidance function is segmented between two raceways with different complexity levels. The first raceway with circular arc profile handles the simple rotational guidance, while the second raceway with free-form profile provides the complex motion control. This segmentation reduces overall device complexity compared to using two complex raceways, while maintaining vibration filtering capability.
Solution Approach 2:
Each raceway is designed with locally optimized geometry: the first raceway has a simple circular arc profile suitable for its guidance function, while the second raceway has a complex free-form profile tailored to its specific role in achieving combined movement. This local optimization reduces overall device complexity while maintaining effectiveness.
3Ease of manufacture
If simple circular arc raceways are used, then the manufacturing is simplified, but the ability to guide combined movement is reduced
Solution Approach 1:
The invention merges the functions of two raceways with different geometries: the simple circular arc first raceway provides easy-to-manufacture rotational guidance, while the complex free-form second raceway provides combined movement guidance. Together, they achieve the complete combined movement guidance function that would be difficult with a single simple raceway, resolving the contradiction between manufacturing simplicity and operational effectiveness.
Solution Approach 2:
The first raceway uses a circular arc (curved) profile that is simple to manufacture, while the second raceway uses a complex free-form curved profile. The combination of these curved raceways enables the pendulum body to execute the desired combined movement of translation and rotation, maintaining ease of operation while benefiting from simplified manufacturing of at least one raceway.
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 enables efficient filtering of torsion oscillations caused by acyclic engine behavior with a reduced amplitude ratio, improving the damping effectiveness and simplifying the manufacturing process of the raceways.
Implementation Method 1
at least one rolling component guiding the movement of the pendulum body relative to the support, with this rolling component cooperating with at least one first raceway integral with the support and with at least one second raceway integral with the pendulum body
Implementation Method 2
the pendulum damping device can be integrated into a torsion damping system of a clutch capable of selectively connecting the combustion engine to the gearbox, in order to filter the vibrations due to the acyclic behavior of the engine
Implementation Method 3
an order value is filtered by the pendulum damping device when the ratio between: the amplitude of a torsion oscillation to this order value in the presence of the pendulum damping device and this same amplitude in the absence of the pendulum damping device is less than 0.2
Implementation Method 4
the rest position of a pendulum body is that in which this pendulum body is subject to a centrifugal force without being subject to torsion oscillations
Data Source
AI summary
A pendulum damping device includes a support free to rotate about an axis; at least one pendulum body that is able to move relative to the support; and at least one rolling component guiding the movement of the pendulum body relative to the support. The rolling component cooperates with at least one first raceway integral with the support and with at least one second raceway integral with the pendulum body. One from among the first raceway and the second raceway defines an arc of a circle and the other one from among the first raceway and the second raceway defining a form other than an arc of a circle.