Liquid-Sealed Vibration Isolator Partition Element
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Solution Overview
Problem
Existing liquid-sealed antivibration devices face challenges in reducing dynamic spring constant for minute amplitude vibrations while maintaining high damping performance for large amplitude vibrations.
Innovation Solution
The device incorporates a partition element with an annular orifice forming member, an elastic wall, and a pair of partition plates connected via a central portion, featuring through holes and recessed portions with grooves that allow liquid flow, enabling dynamic spring constant reduction at high frequencies and maintaining damping performance at low frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the partition plates are restricted by the elastic wall to maintain structural stability, then damping performance for large amplitude vibrations is secured, but dynamic spring constant cannot be sufficiently reduced for minute amplitude vibrations
Solution Approach 1:
The partition plates are designed to be movable rather than fixed, allowing them to reciprocate in the axial direction in response to vibration amplitude. For large amplitude vibrations, the elastic wall restricts the partition plates to maintain structural integrity and damping performance. For minute amplitude vibrations, the partition plates can freely reciprocate to reduce dynamic spring constant, achieving frequency-dependent adaptive behavior.
Solution Approach 2:
The system changes its mechanical parameters based on vibration amplitude. The elastic wall's restraining effect on the partition plates varies with displacement amplitude, creating different system characteristics for large versus minute vibrations. This parameter change enables the device to provide appropriate damping and spring constant characteristics for different operating conditions.
2Adaptability or versatility
If the partition plates are allowed to reciprocate freely to reduce dynamic spring constant, then vibration reduction in high frequency range is improved, but damping performance for large amplitude vibrations deteriorates
Solution Approach 1:
The partition plates transition between restricted and free movement based on vibration amplitude. The elastic wall provides dynamic constraint that adapts to the amplitude of vibration, allowing the system to automatically switch between damping-dominated behavior for large amplitudes and spring constant reduction for small amplitudes.
Solution Approach 2:
The mechanical constraints on the partition plates change with vibration amplitude. At large amplitudes, the elastic wall maintains strong constraint for damping. At small amplitudes, the constraint relaxes to allow reciprocation and reduce dynamic spring constant, achieving amplitude-dependent parameter variation.
3Stability of the object's composition
If the elastic wall completely restricts the partition plates, then structural stability is maintained, but the liquid flow effect and vibration reduction are insufficient
Solution Approach 1:
The elastic wall provides dynamic rather than static restriction. It maintains structural stability through elastic restraint while allowing controlled reciprocation of the partition plates. This dynamic behavior enables both structural integrity and sufficient liquid flow effect for effective vibration reduction.
Solution Approach 2:
The elastic wall acts as a flexible restraining element rather than a rigid constraint. This flexibility allows the partition plates to reciprocate within elastic limits, maintaining structural stability while enabling the liquid flow effect necessary for vibration reduction.
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 effectively lowers the dynamic spring constant for minute amplitude vibrations while securing high damping performance for large amplitude vibrations, enhancing vibration reduction and noise reduction in specific frequency ranges.
Implementation Method 1
damping vibrations by making use of a liquid flow effect generated by an orifice flow passage
Implementation Method 2
a vibration-isolating base body which connects the first mounting member and the second mounting member and is made of a rubbery elastic material
Implementation Method 3
a diaphragm which is mounted on the second mounting member so as to form a liquid sealed chamber between the diaphragm and the vibration-isolating base body and is formed of a rubber film
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A partition element 40 which partitions a first liquid chamber 36A and a second liquid chamber 36B is constituted of an annular orifice forming member 44, an elastic wall 46 which blocks a space formed within an inner peripheral surface 44A, and a pair of partition plates 48, 50 which sandwiches the elastic wall in the axial direction of the elastic wall 46. In at least one of the partition plates 48, 50, a through hole 80 which penetrates the partition plate in the axial direction X is formed on a radially outer Ko side of a connecting portion 56. Due to such a constitution, at the time of inputting of minute amplitude vibrations, a liquid flow is generated in the through hole 80 formed in the partition plate so that the through hole 80 is operated as a high-frequency orifice flow passage.