Centrifugal Pendulum Damper Spacing Bolt Design
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Solution Overview
Problem
Torsional vibration dampers in motor vehicle drivetrains experience noise issues due to centrifugal pendulum-type absorbers colliding at low drivetrain speeds, as the centrifugal force is insufficient to maintain their position radially outward, leading to annoying noise.
Innovation Solution
A torsional vibration damper design featuring a discoidal pendulum flange with centrifugal pendulum-type absorbers connected by spacing bolts and a spacing element in cutouts, preventing contact between absorbers and reducing friction, allowing asynchronous movement and improved damping properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centrifugal pendulum-type absorbers are used to suppress torsional vibration, then vibration damping performance is improved, but at low drivetrain speeds the centrifugal force becomes insufficient causing the absorbers to collide and generate noise
Solution Approach 1:
A spacing element is introduced as an intermediary component between adjacent centrifugal pendulum-type absorbers. This spacing element prevents direct contact and collision between the absorbers at low drivetrain speeds, thereby eliminating the noise problem while allowing the absorbers to maintain their vibration damping function at higher speeds when centrifugal force is sufficient
2Object-affected harmful factors
If spacing elements are introduced to prevent absorber collision, then noise is reduced, but device complexity increases
Solution Approach 1:
The spacing element is designed as a thin, flexible component that can elastically deform during operation. This allows the spacing element to accommodate the dynamic movement of the pendulum absorbers while maintaining the prevention of collision, reducing structural complexity compared to rigid spacing mechanisms
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 effectively prevents noise generation at low speeds by maintaining the separation of centrifugal pendulum-type absorbers, ensuring they do not collide, and enhances damping performance by allowing independent movement and reduced friction at varying speeds.
Implementation Method 1
The centrifugal pendulum-type absorbers are pushed radially outward, and the amount of outward-directed centrifugal force depends on the speed of the drivetrain
Implementation Method 2
a spacing element is arranged in the first cutout that is dimensioned such that the first centrifugal pendulum-type absorber and second centrifugal pendulum-type absorber cannot contact each other
Data Source
AI summary
A torsional vibration damper for a drivetrain of a motor vehicle having a substantially discoidal centrifugal flange and a plurality of centrifugal pendulum-type absorbers. Each centrifugal pendulum-type absorber includes a first pendulum mass and a second pendulum mass. The first pendulum mass is arranged above a first surface of the pendulum flange, and the second pendulum mass is arranged above a second surface of the pendulum flange. The first pendulum mass and the second pendulum mass are firmly connected to each other by means of at least two spacing bolts in each case. The pendulum flange has a plurality of cutouts in which the spacing bolts are guided. A second spacing bolt of a first centrifugal pendulum-type absorber and a first spacing bolt of a second centrifugal pendulum-type absorber are guided in at least one first cutout.