Vibration-Damping Device Membrane Restriction Sections
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Solution Overview
Problem
Existing vibration-damping devices face premature membrane deterioration due to excessive deformation during high-amplitude vibrations, which affects their performance and increases the spring constant, especially when handling high-frequency vibrations.
Innovation Solution
A vibration-damping device with a partition member featuring restriction sections that suppress excessive membrane deformation, positioned outside the communication holes, and inter-hole portions with gradually increasing lengths to reduce noise and maintain membrane performance over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening area of the communication hole is increased to reduce spring constant for high-frequency vibrations, then ride comfort characteristics are improved, but the membrane may be excessively deformed and deteriorated prematurely during high-amplitude vibrations
Solution Approach 1:
The partition member is segmented into multiple functional regions: communication holes for liquid flow, membrane accommodation chambers for elastic deformation, and restriction sections for limiting excessive displacement. This segmentation allows each region to perform its specific function independently, enabling the membrane to deform within safe limits while maintaining vibration damping effectiveness.
Solution Approach 2:
The restriction section acts as an intermediary element between the communication holes and the membrane. It mediates the interaction by providing a physical barrier that limits the membrane's displacement, preventing direct excessive contact between the membrane and the outer wall of the accommodation chamber, thus protecting the membrane from premature deterioration.
2Adaptability or versatility
If the membrane is allowed to deform freely to suppress large liquid pressure variations, then the spring constant is reduced, but the membrane may abut excessively against the accommodating chamber wall causing deterioration
Solution Approach 1:
The restriction section is pre-positioned within the accommodation chamber to anticipate and prevent excessive membrane deformation before it occurs. By having this protective structure in place beforehand, the membrane's displacement is limited to safe ranges, preventing the harmful abutment against the chamber wall that would cause deterioration, while still allowing sufficient deformation for spring constant control.
Solution Approach 2:
The design changes the geometric parameters of the accommodation chamber by introducing restriction sections with specific dimensions and positions. These parameter changes create a controlled deformation space that allows the membrane to achieve the necessary displacement for vibration damping while maintaining a safety margin that prevents excessive deformation and extends membrane service life.
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 restricts excessive membrane deformation and suppresses the increase in spring constant, ensuring long-term membrane performance and reduced noise during high-frequency vibrations.
Implementation Method 1
an elastic body configured to connect both of the attachment members
Implementation Method 2
an elastically deformable membrane, which is made of rubber, accommodated in the accommodating chamber and separately exposed to the main liquid chamber and the subsidiary liquid chamber through the communication holes
Implementation Method 3
a variation in the liquid pressure in the main liquid chamber is applied to the subsidiary liquid chamber through the communication holes and the accommodating chamber
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A vibration-damping device (10) includes a first attachment member (11) having a cylindrical shape connected to any one of a vibration generating unit and a vibration receiving unit, a second attachment member (12) connected to the other unit, an elastic body (13) configured to connect both of the attachment members, and a partition member (15) configured to divide a liquid chamber (16) in the first attachment member (11) into a main liquid chamber (17) having a wall surface formed partly from the elastic body (13), and a subsidiary liquid chamber (18). In the partition member (15), an accommodating chamber (47) in communication with the main liquid chamber (17) and the subsidiary liquid chamber (18) through communication holes (46A, 46B) opened in an axial direction, an elastically deformable membrane (48) accommodated in the accommodating chamber (47) and separately exposed to the main liquid chamber (17) and the subsidiary liquid chamber (18) through the communication holes (46A, 46B), and restriction sections (51A, 51B) disposed more outside in the axial direction than the communication holes (46A, 46B) and overlapping the membrane (48) through the communication holes (46A, 46B) in the axial direction are installed. According to the vibration-damping device (10), performance of the membrane (48) can be maintained for a long period of time.