Fluid-Filled Mount Valve Structure for Wide-Frequency Vibration Damping
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Solution Overview
Problem
Existing fluid-filled vibration damping devices exhibit limited vibration damping performance outside a specific frequency range, failing to adapt to diverse vibration requirements, particularly for vibrations of higher frequencies and smaller amplitudes.
Innovation Solution
A fluid-filled vibration damping device with a partitioned main and sub fluid chambers, incorporating a switching valve and fin-shaped protrusion that tilts to control fluid flow through leak passages, enhancing damping effects across a wider frequency range by adjusting communication and blockage of fluid passages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional fluid-filled vibration damping device is used, then it exhibits good vibration damping performance in a preset specific frequency range, but it does not exhibit the intended vibration damping performance against vibration input with a frequency outside the specific frequency range
Solution Approach 1:
The switching valve is designed to be tiltable at its base end, allowing it to dynamically change its position between open and closed states in response to vibration frequency. This dynamic adjustment enables the device to adapt its fluid passage configuration based on input vibration characteristics, thereby maintaining effective damping across different frequency ranges
Solution Approach 2:
The device changes the flow resistance parameter of the fluid passage by switching between two states: when the switching valve opens the fluid passage, fluid flows freely providing one damping characteristic; when the switching valve closes the fluid passage, fluid flows through the leak passage providing a different damping characteristic. This parameter switching enables adaptation to different vibration frequencies
2Reliability
If the switching valve closes the fluid passage completely, then vibration damping for certain frequencies is improved, but vibration damping for other frequencies deteriorates
Solution Approach 1:
The leak passage serves as an intermediary fluid passage that remains open even when the main fluid passage is closed by the switching valve. This intermediary passage allows continuous fluid flow and pressure equalization, preventing complete isolation of the fluid system and maintaining baseline damping functionality across all frequency ranges
Solution Approach 2:
The fluid passage system is segmented into two independent pathways: the main fluid passage controlled by the switching valve and the leak passage that bypasses the switching valve. This segmentation allows the system to provide different damping characteristics through each pathway depending on the vibration frequency, thereby maintaining adaptability while achieving specialized damping performance
3Device complexity
If a single fluid chamber structure is used, then the device structure is simple, but the vibration damping properties cannot be switched or adapted
Solution Approach 1:
The fluid damping system is segmented into a main fluid chamber and a sub fluid chamber separated by a partition member. This segmentation enables independent control of fluid flow paths through the switching valve and leak passage, providing the capability to switch between different damping properties while maintaining a relatively simple overall structure
Solution Approach 2:
The partition member with integrated switching valve and leak passage serves multiple functions: it separates the fluid chambers, controls fluid flow between chambers, provides a bypass path for continuous pressure equalization, and enables dynamic switching of damping characteristics. This multi-functionality achieves adaptability without proportionally increasing structural complexity
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 provides adaptable vibration damping properties by switching valve mechanisms and fin-shaped protrusions, effectively damping vibrations of varying frequencies and amplitudes, including low, medium, and high frequencies, through fluid flow and elastic deformation.
Implementation Method 1
vibration damping effects based on the elastic deformation of the fin-shaped protrusion
Implementation Method 2
vibration damping effect due to the fluid flow through the leak passage formed between the fin-shaped protrusion and the other wall surface
Data Source
AI summary
A fluid-filled vibration damping device includes a switching valve arranged inside the fluid passage passing through a partition member to communicate with a main fluid chamber and a sub fluid chamber and protruding from one wall surface toward the other wall surface of the fluid passage that face each other. A gap is provided between the switching valve and the other wall surface. A tip end part of the switching valve abuts against the other wall surface through a tilt displacement in a swing manner of the switching valve in the passage length direction of the fluid passage to thereby form a switching mechanism for closing the gap. An elastically deformable fin-shaped protrusion protruding from the tip end part of the switching valve toward the other wall surface is provided. A leak passage is formed between a protruding tip end of the fin-shaped protrusion and the other wall surface.