Fluid Vibration Damping Device Tilting Switching Mechanism
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Solution Overview
Problem
Conventional fluid-filled vibration damping devices experience noise issues due to the impact of a movable rubber plate during switching between open and closed states, as the pressure differential causes striking noise and the plate is not adequately supported, leading to uncontrolled displacement.
Innovation Solution
A fluid-filled vibration damping device with an elastic movable member featuring a clasped portion, switching portion, and thin portion, where the switching portion tilts to open or close the second orifice passage based on pressure fluctuations, reducing impact force by altering the direction of fluid pressure action and using elastic deformation to control tilting motion, thereby minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a movable rubber plate is used to switch the second orifice passage between open and closed states, then vibration damping effect is improved, but striking noise is generated due to impact during abutment
Solution Approach 1:
The patent introduces a cushioning rubber member positioned between the movable rubber plate and the partition member. This cushioning element absorbs the impact energy when the movable plate abuts against the partition member during switching operations, thereby preventing the generation of striking noise while maintaining the vibration damping functionality of the system.
Solution Approach 2:
The cushioning rubber member acts as an intermediary element between the movable rubber plate and the partition member. It mediates the interaction by providing a compliant interface that reduces the direct impact force, thus eliminating noise generation while preserving the switching mechanism's ability to control fluid flow through the orifice passages.
2Ease of operation
If the movable plate is allowed to freely displace in the housing space, then switching between orifice passages is achieved, but impact during abutment cannot be reduced
Solution Approach 1:
The cushioning rubber member is pre-installed in the housing space at the location where the movable plate will abut during switching. This beforehand cushioning ensures that when the movable plate displaces freely to perform switching operations, the impact is absorbed by the cushioning element rather than being transmitted as noise to the vehicle body.
3Reliability
If the second orifice passage is tuned to higher frequency, then high-frequency vibration damping is improved, but low-frequency vibration damping requires closing the second passage
Solution Approach 1:
The patent employs a dynamic switching mechanism where the movable rubber plate responds to pressure differential forces to automatically switch the second orifice passage between open and closed states. This dynamic operation allows the system to adaptively select the appropriate damping characteristics for different vibration frequencies without requiring complex external control mechanisms.
Solution Approach 2:
The switching mechanism operates autonomously based on the pressure differential generated during vibration events. The movable rubber plate self-activates to close the second orifice passage when low-frequency vibration occurs, eliminating the need for external sensors or control systems. This self-service capability simplifies the overall device complexity while maintaining effective multi-frequency vibration damping.
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 solution effectively reduces striking noise during the switching process and achieves excellent vibration damping across a wide frequency range by controlling fluid flow through both orifice passages, ensuring efficient vibration attenuation without leakage.
Implementation Method 1
a tilting motion of the switching portion is permitted relative to the clasped portion through elastic deformation of the thin portion
Implementation Method 2
fluid pressure of the pressure-receiving chamber is exerted on one side of the switching portion and fluid pressure of the equilibrium chamber is exerted on another side of the switching portion
Implementation Method 3
a fluid flow will be produced between the pressure-receiving chamber and the equilibrium chamber so as to exhibit vibration damping effect based on resonance action or other flow action of the fluid
Data Source
AI summary
A fluid-filled type vibration damping device including an elastic movable member attached to a partition member. The elastic movable member includes a clasped portion clasped by the partition member and a switching portion provided to an outer peripheral side of the clasped portion and positioned within a second orifice passage. An abutting portion is provided to the switching portion and projects to lengthwise opposite sides of the orifice passage. A switching mechanism is constituted for opening the orifice passage through a gap formed between the switching portion and the inside face of the orifice passage while closing the orifice passage by abutment of the abutting portion against the inside face of the orifice passage by means of a tilting motion of the switching portion relative to the clasped portion through elastic deformation of a thin portion provided between the clasped portion and the switching portion.