Rolling-Body Torsional Vibration Damper for Low Natural Frequency
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Solution Overview
Problem
Existing torsional vibration dampers are complex and expensive to manufacture and assemble, struggling to achieve low natural frequency while transmitting high torque efficiently, 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 rolling bodies, using energy storage elements and complementary transmission paths to change the natural frequency of the torque-transmitting system, allowing for efficient torque transmission and vibration damping without direct torque transmission between the input and output sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large number of rolling bodies and complementary transmission paths are used to reduce natural frequency, then the functionally effective rigidity can be reduced, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple rolling bodies into a single rolling body that interacts with both transmission paths simultaneously. This consolidation maintains the vibration damping function while reducing the number of components and simplifying the overall device structure, directly addressing the contradiction between reducing natural frequency and avoiding device complexity
Solution Approach 2:
The single rolling body is designed to perform multiple functions: it rolls on both the first and second transmission paths, transmits torque, and provides vibration damping. This multi-functionality replaces what previously required multiple separate rolling bodies, reducing device complexity while maintaining the desired natural frequency characteristics
2Stability of the object's composition
If the functional rigidity is reduced to lower natural frequency, then the torque transmission efficiency improves, but the rigidity of energy storage elements must be increased
Solution Approach 1:
The patent segments the torque transmission function from the vibration damping function. The rolling body handles torque transmission through its rolling contact with transmission paths, while energy storage elements handle only the vibration damping through radial movement. This segmentation allows each component to be optimized independently, resolving the contradiction between functional rigidity and energy storage element rigidity
3Force
If multiple intermediate elements are used to transmit torque, then the torque transmission capacity increases, but the manufacturing and assembly cost increase
Solution Approach 1:
The patent combines the functions of multiple intermediate elements into a single intermediate element that works in conjunction with the single rolling body. This merging maintains sufficient torque transmission capacity while dramatically reducing the number of components that need to be manufactured and assembled, directly addressing the cost issue
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 proposed solution effectively reduces the natural frequency and transmits torque with minimal loss, achieving efficient vibration damping and cost reduction by simplifying the component layout and manufacturing process.
Implementation Method 1
the first rolling body being guided in a rollable manner between the first transmission path and the first counter path, and the second rolling body being guided in a rolling manner between the second transmission path and the second counter path
Implementation Method 2
at least one energy storage element, by means of which the intermediate element assigned to the energy storage element is supported such that it can oscillate
Data Source
AI summary
A torsional vibration damper includes an input side and an output side, first and second rolling bodies, an intermediate element for torque transmission between the input and output sides, and an energy storage element for supporting the intermediate element in an oscillating manner. The intermediate element has a first transmission path for rolling the first rolling body, and a second transmission path for rolling the second rolling body. The input side has a first counter path complementary to the first transmission path. The output side has a second counter path complementary to the second transmission path. The first rolling body is guided between the first transmission path and the first counter path, and the second rolling body is guided between the second transmission path and the second counter path. The energy storage element is arranged with a vector component that acts circumferentially on the intermediate element in a circumferential direction.