Adjustable Torsional Vibration Damper for Torque Shock Absorption
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Solution Overview
Problem
Existing torsional vibration dampers are not optimally effective in managing vibration behavior during torque shocks, necessitating an improved solution for effective torsional vibration damping and torque absorption.
Innovation Solution
A torsional vibration damper design featuring a primary and secondary element with a rotatable mass part and an adjustable restoring apparatus, utilizing spring elements and a pivotable lever element to provide adaptable stiffness and effective damping across a broad excitation frequency range, including automatic adjustment based on engine operating states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional torsional vibration damper with fixed stiffness is used, then the structure is simple, but the vibration damping effectiveness is insufficient across varying excitation frequencies
Solution Approach 1:
The patent applies the dynamics principle by making the stiffness of the restoring apparatus adjustable rather than fixed. The restoring apparatus can automatically adapt its stiffness characteristic curve based on the operating state of the internal combustion engine, allowing the system to optimize vibration damping effectiveness across varying excitation frequencies while managing the complexity through automated adjustment mechanisms
Solution Approach 2:
The patent implements parameter changes by varying the stiffness parameter of the restoring apparatus according to operating conditions. The restoring force characteristic curve is adjusted based on the engine's operating state, enabling the system to maintain optimal vibration damping performance across different frequency ranges without requiring a completely different structure for each condition
2Adaptability or versatility
If the restoring apparatus is made adjustable to adapt to broad excitation frequency ranges, then vibration damping performance improves, but the device complexity increases
Solution Approach 1:
The restoring apparatus is designed to automatically adjust its own stiffness characteristic curve based on feedback from the engine's operating state. This self-service mechanism allows the system to adapt to broad excitation frequency ranges without requiring constant external intervention or complex control systems, thereby improving adaptability while managing device complexity through autonomous operation
Solution Approach 2:
The system employs feedback mechanisms where the operating state of the internal combustion engine is monitored and used to automatically adjust the restoring force characteristic curve of the restoring apparatus. This feedback loop enables the damper to adapt its stiffness characteristics in real-time to match the current excitation frequency range, enhancing versatility while keeping the adjustment process automated and integrated
3Reliability
If the mass part is positioned to maximize damping effect, then torsional vibration damping improves, but the radial spacing requirements increase
Solution Approach 1:
The patent addresses the radial spacing issue by utilizing the axial dimension to position the mass part. Instead of increasing radial spacing, the mass part is arranged axially offset from the axis of rotation, allowing it to rotate in a plane that maintains effective torsional vibration damping while keeping radial dimensions compact. This dimensional transition resolves the contradiction between damping effectiveness and radial space requirements
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 design achieves enhanced torsional vibration damping and torque shock absorption with flexible adaptation to varying conditions, ensuring effective performance in motor vehicles with automatic start-stop systems and maintaining a simplified construction.
Implementation Method 1
an energy store which serves for the rotationally elastic coupling of the input and output sides in the circumferential direction
Implementation Method 2
a mass part which is rotatable relative to the input side or output side
Data Source
AI summary
A number of variations may include a torsional vibration damper having an input side, having an output side and having an energy store for the rotationally elastic coupling of the input and output sides in a circumferential direction, wherein, on the input or output side, there is arranged a mass part that is rotatable relative to the input or output side counter to the restoring force of a restoring apparatus.