Pendulum Rolling Member Axial Clamping to Prevent Radial Dropping
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Solution Overview
Problem
Existing pendulum damping devices in motor vehicle power trains face issues with radial dropping of pendulum bodies when the engine stops, leading to noise and premature wear due to the lack of effective axial clamping between rolling members and pendulum bodies or supports.
Innovation Solution
A pendulum damping device with a rolling member that includes a first and second axial end, featuring an elastic element to axially separate these parts, exerting an axial clamping force on the pendulum body or support, thereby limiting radial and angular movement, and incorporating a cavity to reduce weight and enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an elastic element is inserted between the rolling member and the pendulum body to create axial clamping and friction, then the radial dropping of the rolling member is overcome, but the elastic element suffers premature wear
Solution Approach 1:
The patent introduces a separate clamping element as an intermediary component between the rolling member and the pendulum body. This clamping element directly provides the axial clamping force and friction contact, eliminating the need for the elastic element to perform this function. The elastic element is thus freed from wear-prone direct contact while still maintaining its role in absorbing axial forces, resolving the contradiction between reliability improvement and component durability.
2Device complexity
If the pendulum body is allowed to move freely relative to the support when the engine stops, then the structure remains simple, but noise and premature wear occur due to radial dropping
Solution Approach 1:
The patent implements preliminary action by providing axial clamping force through the elastic element and clamping element before radial dropping can occur. This pre-applied axial constraint ensures that when the engine stops and centrifugal forces disappear, the rolling member remains firmly engaged with the pendulum body, preventing radial dropping, noise, and wear without requiring complex additional structures.
3Device complexity
If direct contact between the elastic element and the pendulum body is used to exert axial clamping, then the structure is simple, but the elastic element experiences premature wear
Solution Approach 1:
The patent introduces a separate clamping element as an intermediary component between the rolling member and the pendulum body. This clamping element directly provides the axial clamping force and friction contact, eliminating the need for the elastic element to perform this function. The elastic element is thus freed from wear-prone direct contact while still maintaining its role in absorbing axial forces, resolving the contradiction between reliability improvement and component durability.
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 axial clamping mechanism effectively prevents radial and angular movement, reducing noise and wear, while minimizing the weight of the rolling member and enhancing the device's ability to filter torsional oscillations.
Implementation Method 1
an elastic element arranged in the rolling member so as to axially separate these two parts so that the rolling member exerts an axial clamping force on one of the pendulum body and the support during the movement of the pendulum body relative to the support
Implementation Method 2
at least one rolling member guiding the movement of the pendulum body relative to the support, the rolling member engaging with at least one rolling track rigidly connected to the support and with at least one rolling track rigidly connected to the pendulum body
Implementation Method 3
the pendulum damping device can be incorporated into a torsion damping system of a clutch capable of selectively connecting the internal combustion engine to the gearbox, in order to filter the vibrations due to the engine acyclisms
Implementation Method 4
When the engine stops, the pendulum bodies are no longer centrifuged, so that depending on their position, they can drop radially
Data Source
AI summary
A pendulum damping device including a support that rotates about an axis, at least one pendulum body and at least one rolling member guiding the movement of the pendulum body relative to the support, the rolling member engaging with at least one rolling track rigidly connected to the support and with at least one rolling track rigidly connected to the pendulum body. The rolling member includes a first part defining a first axial end, a second part defining a second axial end, and a resilient element arranged in the rolling member so as to axially separate these two parts so that the rolling member exerts an axial clamping force on one of the pendulum body and the support during the movement of the pendulum body relative to the support.