Pendulum Damping System with Continuous Raceways
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Solution Overview
Problem
Existing pendulum oscillator-based vibration damping systems in motor vehicle transmissions face limitations due to elastomer abutment elements that degrade under high temperatures and frequent impacts, leading to reduced service life and increased complexity and cost.
Innovation Solution
A vibration damping system with continuously juxtaposed outer raceways around the axis, allowing rolling bodies to freely transition between adjacent raceways during high-amplitude vibrations, eliminating the need for elastomeric abutment elements and preventing deflection limits, thus reducing acoustic emissions and system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If elastomer abutment elements are used to limit pendulum flyweight deflection, then acoustic emissions are reduced, but service life is limited due to degradation from high temperatures and frequent impacts
Solution Approach 1:
The invention removes the elastomer abutment elements from the system entirely. Instead of using elastomeric material to limit deflection, the patent employs a mechanical guide structure with grooves that positively guide the pendulum flyweights, extracting the harmful elastomer component while maintaining deflection control through a different mechanism.
Solution Approach 2:
The invention replaces the elastomeric damping mechanism with a mechanical guidance system. The guide grooves cut into the support member create a positive mechanical guidance system that controls pendulum flyweight movement through geometric constraints rather than through elastomeric deformation and recovery.
2Object-generated harmful factors
If elastomer abutment elements are used to limit deflection, then acoustic emissions are reduced, but system complexity and cost increase
Solution Approach 1:
The invention removes the elastomer abutment elements from the system entirely. Instead of using elastomeric material to limit deflection, the patent employs a mechanical guide structure with grooves that positively guide the pendulum flyweights, extracting the harmful elastomer component while maintaining deflection control through a different mechanism.
Solution Approach 2:
The invention uses homogeneous metallic material for both the support member and pendulum flyweights, eliminating the need for heterogeneous elastomeric components. The guide grooves are cut directly into the metallic support member, creating a unified metallic structure that reduces part count and assembly complexity.
3Shape
If outer raceways are formed in orifices in the support member, then pendulum flyweight deflection is limited, but impacts occur between pendulum flyweights and support member during high-amplitude vibrations
Solution Approach 1:
The invention creates a dynamic guidance system where the guide grooves allow the rolling bodies to transition between different positions along the groove path. During normal operation, the grooves provide guidance, but during high-amplitude vibrations, the rolling bodies can move to the ends of the grooves or transition between adjacent grooves, allowing the system to adapt dynamically to varying vibration amplitudes without rigid impact constraints.
Solution Approach 2:
The invention segments the continuous guidance path into multiple discrete grooves arranged circumferentially around the support member. This segmentation allows the rolling bodies to transition between adjacent grooves when high-amplitude vibrations occur, providing a stepped guidance path that accommodates large deflections while maintaining positive guidance throughout the motion range.
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 enhances the durability and cost-effectiveness of the damping system by eliminating the need for elastomeric components, effectively managing high-amplitude vibrations without limiting deflection, thereby reducing noise and extending the system's service life.
Implementation Method 1
two rolling bodies that interact respectively with one and the other of the two inner raceways of said pendulum flyweight and each interact with one of the outer raceways of the support member in order to guide the oscillating movement of said pendulum flyweight with respect to said support member
Implementation Method 2
a plurality of pendulum flyweights distributed circumferentially around the axis X and each having two inner raceways
Implementation Method 3
The function of a damping system is to filter the vibrations caused by the irregularities upstream from the gearbox
Data Source
AI summary
The invention relates to a vibration damping system for a motor vehicle transmission, comprising:a support member (1) capable of being driven rotationally around an axis X and having a plurality of outer raceways (16); anda plurality of pendulum flyweights (2) distributed circumferentially around the axis X;each of the pendulum flyweights (2) being mounted oscillatingly with respect to the support member (1) by means of two rolling bodies (12, 13) that interact respectively with one and the other of the two inner raceways (14, 15) of the pendulum flyweight (2) and each interact with one of the outer raceways (16) of the support member (1),the outer raceways (16) being juxtaposed one after another continuously around the axis X, so that the rolling bodies (12, 13) are each capable of passing freely from a first outer raceway (16) to a second outer raceway (16).