Centrifugal Pendulum Spring Locking for Low-Speed Noise
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Solution Overview
Problem
Centrifugal pendulum devices in motor vehicle drive trains generate unwanted noise at low speeds due to pendulum mass movement between end stops, which existing damping elements partially address but do not fully mitigate.
Innovation Solution
The centrifugal pendulum device incorporates a spring element mounted on the pendulum mass carrier, which pushes the pendulum mass into a rigid end stop at low speeds to prevent displacement and applies a spring force for fixation, and releases the pendulum mass at higher speeds to allow unhindered movement, utilizing a track design with varying radial positions and locking elements for secure holding and smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the spring element pushes the pendulum mass into the end stop at low speeds, then noise from movement is reduced, but the device complexity increases
Solution Approach 1:
The patent combines the spring element's pushing function with the holding element's positioning function into a single integrated mechanism. The spring element activates the holding element to engage with the locking element, merging force application and position control into one system that reduces noise without proportionally increasing complexity.
Solution Approach 2:
The holding element serves multiple functions: it is pushed by the spring element to engage the locking element (preventing movement noise), it maintains engagement at low speeds (noise reduction), and it allows disengagement at high speeds (normal operation). This multi-functionality achieves noise reduction without requiring separate mechanisms for each function.
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 solution effectively reduces noise generation at low speeds by ensuring reliable fixation and smooth operation at higher speeds, enhancing vibration damping without additional elements, thus simplifying design and operation.
Implementation Method 1
the spring element being designed in such a way that the contact area is pushed in the direction of a radial holding position when the speed falls below the limit speed in order to act on the pendulum mass with a spring force
Implementation Method 2
The basic principle is the utilization of the centrifugal force, which acts on the pendulum mass around the axis of rotation when the pendulum mass carrier is rotating at a certain speed
Implementation Method 3
with an appropriate arrangement of the centrifugal pendulum device, the pendulum mass is influenced by gravity. For example, this influence of gravity causes the pendulum mass to fall from one of the end stops to the opposite one of the end stops
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a centrifugal force pendulum device (10), comprising a pendulum mass carrier (11) that can be rotated about an axis of rotation (15) and at least one pendulum mass (12), which is supported on the pendulum mass carrier (11) in such a way that the pendulum mass (12) can be moved along a track (18) between two end stops (19, 20) that are arranged at a distance from each other in the circumferential direction with respect to the axis of rotation (15). A spring device (23) is provided, which is designed to push the pendulum mass (12) into one of the end stops (19, 20) when the rotational speed of the pendulum mass carrier (11) about the axis of rotation (15) is below a rotational speed limit. The invention further relates to a drive train (1) of a motor vehicle.