Vibration-Damping Device With Offset Pressure Loss Units
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Solution Overview
Problem
Existing vibration-damping devices have complex structures that complicate manufacturing and require a plunger member to switch liquid flow between chambers, which can be cumbersome.
Innovation Solution
A vibration-damping device with a pressure loss unit in the limiting passage that includes an intermediate chamber and communication passages, where the openings are offset to increase pressure loss and facilitate liquid flow through specific passages based on vibration amplitude, eliminating the need for a plunger member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plunger member is used to switch liquid flow between chambers, then vibration damping effectiveness is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts and removes the plunger member from the system entirely. Instead of using a mechanical plunger to switch liquid flow between chambers, the patent designs the limiting passages themselves to provide flow resistance through their geometric characteristics (length, cross-sectional area, curvature radius), thereby eliminating the need for moving parts while maintaining vibration damping effectiveness.
Solution Approach 2:
The invention changes the parameters of the limiting passages (length L, cross-sectional area A, curvature radius r) to achieve different flow resistance characteristics. By adjusting these geometric parameters, the passages can selectively allow liquid flow under different vibration conditions, replacing the need for a plunger-based switching mechanism.
2Reliability
If a plunger member is used to switch liquid flow, then vibration absorption capability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The plunger member is completely extracted from the system. The vibration absorption capability is achieved through the fixed geometric parameters of the limiting passages rather than through a mechanical switching component, significantly simplifying the manufacturing process.
Solution Approach 2:
The functions of flow switching and flow resistance provision are merged into the limiting passage structure itself. The passage geometry simultaneously determines both the flow path and the resistance characteristics, eliminating the need for separate plunger mechanisms and simplifying manufacturing.
3Adaptability or versatility
If limiting passages are designed with different resonance characteristics, then adaptability to different vibration amplitudes is improved, but device complexity increases
Solution Approach 1:
Different sections of the limiting passages are designed with different local geometric qualities (varying cross-sectional areas, lengths, and curvature radii) to create distinct resonance characteristics. This allows the system to adapt to different vibration amplitudes through the inherent properties of different passage sections rather than through complex switching mechanisms.
Solution Approach 2:
The system achieves dynamic adaptability to different vibration amplitudes through the nonlinear flow characteristics of the limiting passages. As vibration amplitude changes, the dominant flow path automatically shifts between passages with different resonance characteristics, providing adaptive vibration damping without mechanical 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
This design simplifies the structure, facilitates manufacturing, and effectively dampens both high and low amplitude vibrations by controlling liquid flow through resonance in the appropriate passages, ensuring reliable vibration absorption.
Implementation Method 1
an elastic body (13) that couples both the attachment members (11, 12) together
Implementation Method 2
A first limiting passage of the limiting passage that resonates with input of a first vibration, and a second limiting passage of the limiting passage that resonates with input of a second vibration with a greater amplitude than the amplitude of the first vibration
Implementation Method 3
The first limiting passage includes a pressure loss unit that causes a loss in the pressure of the liquid that flows therethrough
Implementation Method 4
a portion that faces the first opening and that is in the wall surface that defines the intermediate chamber is formed by the elastic membrane
Data Source
AI summary
A vibration-damping device (10) in the present application includes a first limiting passage (51) and a second limiting passage (52). The first limiting passage (51) includes pressure loss units (53a, 53b). Each of the pressure loss units (53a, 53b) is provided with an intermediate chamber (55), a first communication passage (57), and a second communication passage (58). An opening axis (L1) of a first opening (59) that opens toward the inside of the intermediate chamber (55) in the first communication passage (57) and an opening axis (L2) of a second opening (60) that opens toward the inside of the intermediate chamber (55) in the second communication passage (58) are offset from each other. At least one of the first opening (59) and the second opening (60) opens toward a wall surface that defines the intermediate chamber (55). The pressure loss units (53a, 53b) include a first pressure loss unit (53a) in which the first communication passage (57) directly communicates with the first liquid chamber (14) and the first opening (59) opens toward the wall surface that defines the intermediate chamber (55). In the first pressure loss unit (53a), a portion that faces the first opening (59) and that is in the wall surface that defines the intermediate chamber (55), is formed by the elastic membrane (39).