Torsional Vibration Damper Friction Device With Angle-Dependent Torque
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Solution Overview
Problem
Existing torsional vibration dampers face limitations in achieving a wide range of friction torque levels within a compact installation space, particularly when different operating points or driving states require significantly different friction torque levels, which affects noise comfort and service life in drive train components.
Innovation Solution
A torsional vibration damper with a friction device featuring an input side with a first and second disk, an output side with a spring element and friction disks, where the spring element has multiple contact areas along the axial direction, allowing the axial force and thus friction torque to vary with rotation angle by contacting different diameters of the spring element, enabling a higher friction torque that is a multiple of the lowest torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If only varying the friction radius between the same friction partners is used to adjust friction torque, then the friction torque can be varied to some extent, but the maximum friction torque can be more than doubled only by using multiple friction devices designed for different friction torques, which increases device complexity and radial installation space
Solution Approach 1:
The spring element is designed with multiple contact areas at different radial positions, allowing the contact radius to dynamically change based on the rotation angle between input and output sides. This dynamic adjustment enables a single friction device to achieve multiple friction torque levels (more than doubling the maximum torque) without requiring multiple separate friction devices, thus resolving the contradiction between friction torque range and device complexity
Solution Approach 2:
Instead of adjusting friction torque only by changing the friction radius in one dimension, the invention introduces the spring element's multiple contact areas at different radial positions, adding another dimension of adjustment. The contact force is transmitted via different contact areas (first contact area, second contact area) depending on rotation angle, enabling friction torque variation beyond what friction radius adjustment alone can achieve
2Adaptability or versatility
If multiple friction devices designed for different friction torques are provided to achieve different friction torque levels, then the friction torque can be adapted to different operating points, but the radial installation space increases
Solution Approach 1:
A single spring element is designed with multiple contact areas (first contact area, second contact area) that can be selectively engaged depending on the rotation angle and operating conditions. This multi-functional design allows one friction device to perform the work of multiple friction devices with different torque ratings, achieving adaptability to different operating points without increasing radial installation space
Solution Approach 2:
The spring element is arranged between the friction discs in the axial direction, with multiple contact areas nested within the same axial space. Different contact areas are positioned at different radial positions, allowing the spring element to function as multiple friction devices in one, thus reducing radial installation space while maintaining adaptability to various operating conditions
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 design allows for a significant variation in friction torque levels without increasing the radial installation space, effectively addressing the need for diverse torque requirements across different rotation angles, enhancing noise comfort and service life of drive train components.
Implementation Method 1
Friction devices are used in torsional vibration dampers to apply a specific friction torque to the relative rotation between an input side and an output side in order to appropriately extract energy from the vibrating system and thus dampen it
Implementation Method 2
The spring element is arranged between the friction discs along the axial direction, and a contact force acting in the axial direction at least between the friction discs is transmittable via the contact regions
Implementation Method 3
Friction devices are used in torsional vibration dampers to apply a specific friction torque to the relative rotation between an input side and an output side in order to appropriately extract energy from the vibrating system and thus dampen it
Implementation Method 4
Friction devices are used in torsional vibration dampers to apply a specific friction torque to the relative rotation between an input side and an output side in order to appropriately extract energy from the vibrating system and thus dampen it
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to a torsional vibration damper comprising a friction device (1), having an axis of rotation (3) extending in an axial direction (2), wherein: the friction device (1) has an input side (4) which comprises a first disc (5) and a second disc (6), and an output side (7) which is located between the discs (5, 6) in the axial direction (2), can be rotated relative to the input side (4) and comprises a first friction disc (8) and a second friction disc (9); the output side (7) has a spring element (10) which comprises a plurality of contact regions (11, 12, 13); the spring element (10) is located between the friction discs (8, 9) in the axial direction (2), and a contact force (14) acting at least between the friction discs (8, 9) in the axial direction (2) can be transmitted via the contact regions (11, 12, 13); and the contact force (14) can be transmitted at least via a first contact region (11) or a second contact region (12) in accordance with an angle of rotation (15) between the input side (4) and the output side (7), which regions are located at diameters (16, 17) that are different from one another, and which contact the same friction disc (8, 9).