Liquid-Charged Antivibration Device With Variable Stiffness Partition
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Solution Overview
Problem
Conventional liquid-charged antivibration devices face challenges in maintaining consistent dynamic characteristics across varying input amplitudes, leading to excessive damping at low amplitudes and inadequate damping at high amplitudes, resulting in significant amplitude dependency.
Innovation Solution
A liquid-charged antivibration device with a partitioning member that includes a thin membrane portion and a thick membrane portion, where the thick membrane portion has a greater thickness along the vibration input axis, and restricting portions that control elastic deformation, reducing amplitude dependency by adjusting stiffness based on input amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the characteristics of the orifice passage are set for engine shake (large amplitude), then high damping characteristic is achieved, but unnecessarily significant damping characteristic occurs at idle (small amplitude)
Solution Approach 1:
The elastic partitioning member transitions from a static component to a dynamic one that changes its effective stiffness based on vibration amplitude. At small amplitudes, the thin membrane portion provides flexibility; at large amplitudes, the thick membrane portion with restricting portions engages to increase stiffness, enabling the system to adapt to different operating conditions
Solution Approach 2:
The elastic partitioning member incorporates regions with different thicknesses (thin membrane portion and thick membrane portion) to create local variations in stiffness. This allows different parts of the same component to serve different functions: the thin portion handles small vibrations while the thick portion with restricting portions handles large vibrations
2Ease of operation
If the characteristics of the orifice passage are set for idle (small amplitude), then low dynamic spring characteristic is achieved, but damping characteristic is degraded at engine shake (large amplitude)
Solution Approach 1:
The system dynamically adjusts its mechanical properties based on vibration amplitude. During idle conditions, the thin membrane portion remains engaged providing low spring characteristics. During engine shake, the system transitions to engage the thick membrane portion with restricting portions, dynamically switching between two operational states to meet different performance requirements
3Device complexity
If a single thickness elastic partitioning member is used, then simple structure is maintained, but amplitude dependency increases and frequency characteristic varies with amplitude
Solution Approach 1:
Rather than using a uniformly thick partitioning member, the invention introduces local quality variations with thin and thick membrane portions. This allows the same component to provide different mechanical responses for different vibration amplitudes, stabilizing frequency characteristics across varying operating conditions while maintaining overall structural simplicity
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 device achieves reduced amplitude dependency by absorbing low-frequency vibrations effectively and maintaining low dynamic spring characteristics at small amplitudes, while enhancing damping characteristics at large amplitudes, thereby improving antivibration performance and reducing frequency characteristic variations.
Implementation Method 1
The thin membrane portion absorbs variation in liquid pressure
Implementation Method 2
the displacement amount of the thick membrane portion is restricted by the first restricting portion, while the displacement amount of the thin membrane portion is restricted by the second restricting portion, and thus the stiffness of the elastic partitioning member is effectively improved
Data Source
AI summary
An object of the present invention is to provide a liquid-charged antivibration device for reducing amplitude dependency. Provided is a liquid-charged antivibration device including: a liquid chamber in which operating liquid is charged; and a partitioning member which partitions the liquid chamber into a main liquid chamber and a sub liquid chamber.