Fluid-Filled Vibration Damping Device With Segmented Intermediate Chamber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluid-filled vibration damping devices face challenges in effectively damping vibrations of frequencies different from the tuning frequency of the orifice passages, and as they become more compact, the vibration damping effect may be diminished, leading to insufficient performance.
Innovation Solution
A fluid-filled vibration damping device with a moveable film and a flow straightening plate having apertures, where the flow straightening plate is positioned to exert liquid pressure on the moveable film efficiently, allowing for effective fluid flow through the second orifice passage, and flow limiting means are used to manage fluid flow during specific vibration frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a moveable rubber film is arranged in the dividing wall section between the pressure-receiving chamber and the intermediate chamber which lie on the flow path of the second orifice passage, then the device can dampen low-frequency vibrations through the first orifice passage, but fluid flow through the second orifice passage is limited by the elasticity of the moveable rubber film even at times of input of vibration in the frequency range to which the second orifice passage has been tuned
Solution Approach 1:
The patent divides the single intermediate chamber into multiple sub-chambers (first intermediate chamber and second intermediate chamber) separated by a rigid partition. This segmentation allows the second orifice passage to connect to the second intermediate chamber without being blocked by the moveable rubber film, enabling independent fluid flow paths for different frequency ranges while maintaining the adaptability to dampen multiple vibration frequencies.
2Volume of moving object
If the device is made more compact in size to meet vehicle space limitations, then installation space is reduced, but the vibration damping effect afforded by the second orifice passage may be diminished further
Solution Approach 1:
The patent nests the multiple intermediate chambers and partition structure within the existing housing of the vibration damping device, utilizing the available internal space efficiently. The rigid partition and additional chamber are integrated into the existing structure without significantly increasing the external dimensions, allowing compact design while maintaining adequate fluid flow paths for effective vibration damping.
3Adaptability or versatility
If a second orifice passage is formed connecting the pressure-receiving chamber with the intermediate chamber to dampen high-frequency vibrations, then vibration damping effect against multiple frequencies is achieved, but the moveable rubber film arrangement limits fluid flow through this passage
Solution Approach 1:
The patent segments the intermediate chamber into sub-chambers and reconfigures the second orifice passage to connect to the second intermediate chamber rather than passing through the moveable rubber film. This reduces the complexity of the partition structure by eliminating the need for the moveable film to be positioned in the path of the second orifice passage, while still achieving vibration damping across multiple frequencies.
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 achieves enhanced vibration damping capabilities with improved fluid flow through the second orifice passage, allowing for effective vibration damping across a range of frequencies while maintaining a compact and lightweight design.
Implementation Method 1
fluid flow through the orifice passage, producing vibration damping effect on the basis of flow action of the fluid
Implementation Method 2
vibration damping effect on the basis of flow action of the fluid
Implementation Method 3
liquid pressure of the pressure-receiving chamber will be transmitted to the intermediate chamber through minute deformation of the moveable rubber film
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A fluid-filled vibration damping device (10, 98, 114) including: a pressure-receiving chamber (58) and an equilibrium chamber (60) disposed on either side of a partition plate (50, 106, 124), while being connected through a first orifice passage (68); a moveable film (54, 110, 128) arranged to either a pressure-receiving chamber side or an equilibrium chamber side of the partition plate (50, 106, 124) while being spaced away therefrom to define therebetween an intermediate chamber (62); a second orifice passage (72) connecting the intermediate chamber (62) and one of the pressure-receiving and the equilibrium chambers (58, 60) while being tuned to higher frequency than the first orifice passage (68); and a flow straightening plate (42, 43, 74, 103, 104, 130) arranged in opposition to the moveable film (54, 110, 128) at least at one of the intermediate chamber side and an opposite side thereof, the flow straightening plate (42, 43, 74, 103, 104, 130) having a plurality of flow straightening apertures (76) opening towards the moveable film (54, 110, 128) and furnished with flow limiting means (78, 86).