Hydraulic Vibration Isolator Structure for Medium-Frequency Damping
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Solution Overview
Problem
Conventional vibration isolators face difficulties in attenuating and absorbing medium frequency vibrations within the range of 200 Hz to 1000 Hz.
Innovation Solution
A vibration isolator design featuring a tubular first mounting member, a second mounting member connected via an elastic body, a partition member with a liquid chamber divided into main and auxiliary liquid chambers, and a movable member with orifice passages and communication holes, where a tubular member protrudes on the partition member's first wall surface, allowing communication between the chambers and enhancing deformation and hydraulic pressure control to attenuate medium frequency vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional vibration isolator structure is used, then low frequency vibrations (less than 200 Hz) can be attenuated, but medium frequency vibrations (200 Hz to 1000 Hz) cannot be effectively attenuated
Solution Approach 1:
The partition member is divided into multiple sections with different hole configurations: a first section with first communication holes for medium frequency vibrations, a second section with second communication holes for low frequency vibrations, and a third section with third communication holes for additional frequency ranges. This segmentation allows each section to target specific frequency ranges, thereby expanding the overall frequency coverage while maintaining effective attenuation across the entire spectrum
Solution Approach 2:
Different sections of the partition member are designed with locally optimized characteristics: the first section has first communication holes positioned and sized to attenuate medium frequency vibrations (200-1000 Hz), the second section has second communication holes optimized for low frequency vibrations (less than 200 Hz), and the third section has third communication holes for additional frequency ranges. Each local section is tailored to its specific frequency target, enabling comprehensive frequency range coverage
2Ease of manufacture
If the partition member has simple hole configuration, then manufacturing is easier, but medium frequency vibration attenuation is insufficient
Solution Approach 1:
The partition member is segmented into multiple sections, each with simple hole patterns that are easy to manufacture. The first section contains first communication holes, the second section contains second communication holes, and the third section contains third communication holes. Each section's hole configuration is relatively simple, but the combination of sections provides comprehensive medium frequency vibration attenuation capability
Solution Approach 2:
Multiple sections with different hole configurations are merged into a single partition member structure. The first section with first communication holes, the second section with second communication holes, and the third section with third communication holes are combined to create a unified partition member that achieves comprehensive vibration attenuation across multiple frequency ranges while maintaining manufacturing 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
Effectively attenuates and absorbs medium frequency vibrations by shifting the deformation node and controlling hydraulic pressure, reducing the apparent rigidity of the elastic body and enhancing vibration absorption capabilities.
Implementation Method 1
an elastic body elastically connecting the first and second mounting members to each other
Implementation Method 2
the liquid inside the liquid chamber is flowed through the orifice passage
Implementation Method 3
the liquid inside the liquid chamber is flowed through the first communication holes and the second communication hole
Implementation Method 4
the movable member is deformed or displaced inside the accommodation chamber
Data Source
AI summary
In a vibration isolator of the present invention, an orifice passage (24) configured to allow a main liquid chamber (14) and an auxiliary liquid chamber (15) to communicate with each other, a plurality of first communication holes (42a) configured to allow the main liquid chamber and an accommodation chamber (42) to communicate with each other, and a second communication hole (42b) configured to allow the auxiliary liquid chamber and the accommodation chamber to communicate with each other are formed in a partition member (16), a tubular member (21) that protrudes in an axial direction toward an elastic body is formed on a first wall surface (16b) of the partition member in which the first communication holes are opened and which constitutes part of an inner surface of the main liquid chamber, and the plurality of first communication holes are opened in both of an inner portion (16f) of the first wall surface positioned inside the tubular member and an outer portion (16g) of the first wall surface positioned outside the tubular member.