Torsional Vibration Damper Friction Disc Layout for Variable Torque
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Solution Overview
Problem
Existing torsional vibration dampers face challenges in achieving a wide range of friction torque levels within limited radial installation space, particularly when significantly different torque levels are required across different rotation angle ranges to ensure noise comfort and service life of drive train components.
Innovation Solution
A torsional vibration damper with a friction device that modulates axial force transmission based on the angle of rotation, using a spring element with multiple contact regions to vary friction torque, allowing for a maximum friction torque that is a multiple of the lowest torque without increasing the radial size of the friction device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the friction radius is varied to achieve different friction torque levels, then the friction torque can be adjusted, but the radial installation space increases
Solution Approach 1:
The patent applies the dynamics principle by making the friction radius variable through rotational movement. The friction element can rotate relative to the friction partner, dynamically changing the contact radius according to the rotation angle. This allows the friction torque to be adjusted from a minimum to a maximum value (which can be multiple times higher) without requiring multiple friction elements with different fixed radii, thereby avoiding increased radial installation space.
Solution Approach 2:
The patent applies parameter changes by varying the friction radius parameter as a function of rotation angle. Instead of using multiple friction elements with different fixed radii parameters, the system changes the radius parameter dynamically during operation. This allows achieving multiple friction torque levels within the same radial space by changing the geometric parameter (radius) through rotation.
2Force
If multiple friction devices with different friction torques are provided, then different torque levels can be achieved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a single friction device that can perform multiple functions - providing different friction torque levels for different operating conditions. The friction element rotates to engage at different contact radii with the friction partner, allowing one device to replace multiple friction devices with different fixed torque characteristics. This multi-functional design reduces the number of components while maintaining the ability to provide appropriate friction torque for various driving conditions.
3Device complexity
If the friction torque is kept constant, then the design is simple, but it cannot address different operating points requiring different torque levels
Solution Approach 1:
The patent transforms the static friction torque design into a dynamic one. The friction element is capable of rotational movement relative to the friction partner, which dynamically adjusts the contact radius and thus the friction torque. This dynamic capability allows the system to adapt to different operating points and driving conditions while maintaining a relatively simple overall structure, avoiding the need for multiple separate friction devices.
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 solution enables the friction device to achieve a maximum friction torque that is several times higher than the minimum, effectively addressing the need for varying torque levels across different operating conditions while maintaining a compact design.
Implementation Method 1
The spring element (10) is arranged in the axial direction (2) between the friction discs (8, 9), and a contact force (14) acting in the axial direction (2), at least between the friction discs (8, 9), can be transmitted via the contact regions (11, 12, 13)
Implementation Method 2
Friction devices are used in torsional vibration dampers in order to apply a friction torque to the relative rotation between an input side and an output side in a targeted manner in order to appropriately withdraw energy from the oscillating system and thereby dampen it
Data Source
AI summary
A friction device for a torsional vibration damper includes an axis of rotation, an input side with a first disc and a second disc, and an output side between the first disc and the second disc and rotatable relative to the input side. The output side has a first friction disc, a second friction disc, and a spring element between the first friction disc and the second friction disc. The spring element has first, second and third contact regions. At a first angle of rotation between the input side and the output side, an axial contact force between the first friction disc and the second friction disc is transmittable via the first contact region and the third contact region. At a second angle of rotation, different than the first angle of rotation, the axial contact force is transmittable via the second contact region and the third contact region.