Hydraulic Mount Restriction Passage for Variable-Amplitude Vibration Damping
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Solution Overview
Problem
Existing vibration-damping devices struggle to absorb and damp vibrations effectively when the amplitude of input vibrations increases or decreases beyond a certain range, while maintaining a low dynamic spring constant for minute amplitude vibrations.
Innovation Solution
A vibration-damping device with a tubular first attachment member, a second attachment member, an elastic body, and a partition member that includes a membrane and an orifice allowing communication between main and auxiliary liquid chambers. The orifice features a restriction passage with opposing flow directions in its main and auxiliary chamber-side passages, enabling adjustable flow resistance in response to varying vibration amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dynamic spring constant is suppressed to be low for minute amplitude vibrations, then the vibration damping performance for minute vibrations is improved, but the ability to absorb and damp larger amplitude vibrations deteriorates
Solution Approach 1:
The restriction passage is designed with opposing flow directions in its main and auxiliary chamber-side passages, creating a dynamic system where flow resistance automatically adjusts based on vibration amplitude. This dynamic configuration allows the device to adapt its damping characteristics in real-time without external control
Solution Approach 2:
The flow resistance parameter changes automatically with vibration amplitude due to the opposing flow direction design. When vibration amplitude increases, the liquid flow rate through the restriction passage increases, thereby increasing the flow resistance and damping force proportionally
2Reliability
If the flow resistance is increased to damp larger amplitude vibrations, then the vibration absorption capability is improved, but the dynamic spring constant increases making it unsuitable for minute amplitude vibrations
Solution Approach 1:
The system transitions from a static flow resistance design to a dynamic one where the restriction passage's opposing flow directions create automatic adjustment. The damping force becomes proportional to vibration amplitude, maintaining low dynamic spring constant for small vibrations while providing sufficient damping for large vibrations
Solution Approach 2:
The vibration-damping device self-regulates its damping characteristics based on the input vibration amplitude. The liquid flow automatically adjusts through the restriction passage without external control, with the opposing flow directions causing flow resistance to increase naturally as vibration amplitude increases
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 effectively suppresses the dynamic spring constant during minute amplitude vibrations and can absorb and damp vibrations of varying amplitudes while maintaining resonance frequency tuning, thereby enhancing vibration damping performance.
Implementation Method 1
the membrane is elastically deformed
Implementation Method 2
the internal pressure of the main liquid chamber is fluctuated to make the liquid flow through the first restriction passage, for example. Accordingly, this vibration is damped and absorbed
Implementation Method 3
an elastic body that connects the first attachment member and the second attachment member to each other
Data Source
AI summary
A vibration-damping device includes a first attachment member (11), a second attachment member (12), an elastic body (13), and a partition member (17), the partition member including a membrane (31) and an orifice (20). The orifice (20) includes a first communication hole (21), a second communication hole (22), an intermediate chamber (35), a restriction passage (23), and a communication hole (24), the restriction passage includes a main liquid chamber-side passage (25) and an auxiliary liquid chamber-side passage (26), the main liquid chamber-side passage and the auxiliary liquid chamber-side passage extend in a circumferential direction and are disposed to be connected to each other in a radial direction, and when the liquid flows through the restriction passage from any one of the first communication hole and the second communication hole toward the other, the flow direction in the main liquid chamber-side passage and the flow direction in the auxiliary liquid chamber-side passage are opposite to each other.