Roll-Body Torsional Vibration Damper for Low-Frequency Torque Transfer
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Solution Overview
Problem
Existing torsional vibration dampers are complex and expensive to manufacture and assemble, struggling to balance low natural frequency and high torque transmission efficiency, due to conflicting requirements of functional rigidity and energy storage element design.
Innovation Solution
A torsional vibration damper with a reduced number of components and roll bodies, utilizing intermediate elements supported by energy storage elements and roll bodies with complementary transmission paths, allowing for adjustable pretensioning and independent rigidity design to change the natural frequency of the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple roll bodies and complementary transmission paths are used to achieve low natural frequency and high torque transmission, then the functional rigidity can be reduced and torque transmission improved, but the device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent combines multiple roll bodies into a single integrated roll body structure that interacts with complementary transmission paths on both the input and output sides. This merging approach maintains the torque transmission functionality while significantly reducing the number of separate components, thereby lowering device complexity and manufacturing cost.
Solution Approach 2:
The single roll body is designed to perform multiple functions: it transmits torque between the input and output sides, provides the necessary flexibility to reduce natural frequency, and interacts with complementary transmission paths to achieve both low natural frequency and high torque transmission efficiency simultaneously.
2Speed
If the functional rigidity is reduced to lower the natural frequency, then the natural frequency requirement is met, but the torque transmission capability is compromised
Solution Approach 1:
The system employs dynamic characteristics through the interaction between the roll body and complementary transmission paths. The roll body can flexibly deform along the transmission paths, providing the necessary compliance to reduce natural frequency while maintaining the structural integrity and rigidity needed for high torque transmission when required.
Solution Approach 2:
The patent changes the effective rigidity parameter dynamically through the geometric design of the complementary transmission paths. By optimizing the path geometry and roll body characteristics, the system achieves low natural frequency through controlled flexibility while preserving high torque transmission capability through the rigid support provided by the complementary paths.
3Force
If energy storage elements are designed with high rigidity to transmit high torque, then the torque transmission is improved, but the natural frequency cannot be reduced effectively
Solution Approach 1:
The energy transmission function is segmented between the rigid complementary transmission paths and the more flexible roll body. The complementary paths on the input and output sides provide the rigid structural support for high torque transmission, while the roll body provides the flexible connection that enables natural frequency reduction through controlled deformation.
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 torque transmission with minimal loss, reducing manufacturing and assembly costs while allowing for flexible natural frequency adjustment based on torque conditions.
Implementation Method 1
the roll body is guided in a rotatable manner between the transmission path and the counter path for torque transmission
Implementation Method 2
at least one energy storage element, by means of which the intermediate element is supported so as to be able to vibrate relative to the input side and relative to the output side
Data Source
AI summary
A torsional vibration damper includes an input side for receiving a torque, an output side for dispensing the torque, an intermediate element arranged for torque transmission between the input side and the output side, an energy storage element supporting the intermediate element such that it can vibrate relative to the input side and the output side, and a roll body. The intermediate element has a transmission path for the roll body. The input side or the output side forms a path side with a counter path that is complementary to the transmission path, and the other of the input side or the output side forms a force side. The roll body is guided in a rotatable manner between the transmission path and the counter path, and the energy storage element connects the force side to the intermediate element for torque transmission.