Fluid-Filled Mount Leak Passage for High-Frequency Vibration Damping
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Solution Overview
Problem
Existing fluid-filled vibration-damping devices for engine mounts face challenges in achieving excellent vibration-damping performance due to complex and space-consuming structures, particularly when dealing with higher frequency vibrations, as they require additional components like switching paths and valves that can be slow to respond.
Innovation Solution
Incorporating a leak passage with a smaller cross-sectional area than the orifice passage, which maintains communication between the pressure-receiving and equilibrium chambers, even when the orifice passage is obstructed, allowing for effective vibration-damping through lower dynamic spring characteristics and simplifying the device structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switching path and switch valve are added to handle higher frequency vibrations, then vibration-damping performance is improved, but device complexity and space requirements increase
Solution Approach 1:
The invention extracts the essential function of maintaining chamber communication during high-frequency vibrations by providing a dedicated leak passage that operates independently of the relief valve mechanism. This separates the high-frequency damping function from the impact load relief function, eliminating the need for complex switching mechanisms while maintaining effective vibration damping across different frequency ranges.
Solution Approach 2:
The invention segments the fluid communication paths into distinct functional channels: the orifice passage for normal operation, the short-circuit passage for impact load relief, and the leak passage for high-frequency vibration damping. This segmentation allows each passage to be optimized for its specific function without requiring complex interaction between components.
2Reliability
If a switch valve is used to control the switching path, then vibration-damping performance is improved, but response speed decreases due to valve deformation time
Solution Approach 1:
The invention removes the switching valve component entirely by providing a passive leak passage that automatically maintains chamber communication during high-frequency vibrations. This eliminates the response delay inherent in valve-based switching mechanisms, as the leak passage provides immediate fluid communication without requiring mechanical actuation or deformation.
3Reliability
If the orifice passage is tuned to a specific frequency, then vibration-damping performance is improved at that frequency, but performance deteriorates at higher frequencies due to antiresonance
Solution Approach 1:
The leak passage acts as an intermediary fluid communication path that becomes active when the orifice passage experiences antiresonance at higher frequencies. This intermediary passage ensures continuous chamber communication and maintains vibration-damping performance across a broader frequency range by providing an alternative flow path when the primary orifice passage is obstructed.
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 configuration enhances vibration-damping performance by maintaining communication between chambers, stabilizing the damping effect and reducing dynamic spring issues, while also simplifying the device structure and improving space efficiency.
Implementation Method 1
utilizing a vibration-damping effect or the like based on a flow action of a non-compressible fluid filled therein
Implementation Method 2
The short-circuit passage can be switched to the communication state by deformation or displacement of the relief valve by the action of the negative pressure of the pressure-receiving chamber
Implementation Method 3
the at least one leak passage keeping a communication state between the pressure-receiving chamber and the equilibrium chamber with a smaller passage cross section than that of the orifice passage
Data Source
AI summary
A fluid-filled vibration-damping device including: a pressure-receiving chamber with a non-compressible fluid filled therein; an equilibrium chamber with the non-compressible fluid filled therein; an orifice passage connecting the pressure-receiving chamber and the equilibrium chamber with each other; a relief configured to open a short-circuit passage by an action of a negative pressure occurring in the pressure-receiving chamber upon input of an impact load so as to connect the pressure-receiving chamber with the equilibrium chamber so that cavitation is suppressed; and at least one leak passage provided at a part of the short-circuit passage in the relief, the at least one leak passage keeping a communication state between the pressure-receiving chamber and the equilibrium chamber with a smaller passage cross section than that of the orifice passage, even when the short-circuit passage is not opened.