Fluid Vibration Damping Device Inward Protrusion Constraint
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Solution Overview
Problem
Conventional fluid-filled vibration damping devices face issues with insufficient tensile spring force and noise generation due to the displacement of the main rubber elastic body's inner periphery under tensile load, as the outer periphery is primarily bound by the insertion metal fitting, leading to uneven load distribution and potential collision with the partition member.
Innovation Solution
The introduction of an inward protrusion on the insertion metal fitting, which extends transversely to the tension direction, increases the constrained area of the main rubber elastic body, enhancing tensile spring force and preventing upward displacement, while a sealing rubber storage space is formed to evenly distribute compressive deformation and maintain fluid-tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the main rubber elastic body is fitted into the second mounting member with the insertion metal fitting in a cylindrical shape, then the outer periphery of the larger-diameter end is bound and retained, but the inner periphery is easily pulled and displaced under tensile load, resulting in insufficient tensile spring force
Solution Approach 1:
The insertion metal fitting changes from a simple cylindrical shape to one with an inward protrusion that extends in a direction transverse to the tension direction. This dimensional change allows the fitting to constrain the main rubber elastic body in both axial and radial directions, preventing upward displacement of the inner periphery while maintaining outer periphery binding, thereby enhancing tensile spring force
Solution Approach 2:
The insertion metal fitting is segmented into different functional regions: the cylindrical portion that binds the outer periphery of the main rubber elastic body, and the inward protrusion that specifically constrains the inner periphery. This segmentation allows each region to perform its specific function independently, with the cylindrical portion providing axial retention and the inward protrusion providing radial constraint, together achieving stable position and enhanced tensile spring force
2Object-affected harmful factors
If the inner periphery of the main rubber elastic body is not constrained, then the structure is simpler, but the inner periphery collides against the partition member under tensile load, generating striking noises
Solution Approach 1:
The inward protrusion extends in a direction transverse to the tension direction, creating a radial constraint that prevents the inner periphery of the main rubber elastic body from colliding with the partition member. This transverse dimension constraint effectively eliminates the harmful collision noise while maintaining structural simplicity through the integrated protrusion design
3Reliability
If the cylindrical portion of the second mounting member is bonded by pressure to the insertion metal fitting, then fluid tightness is secured, but the sealing rubber may be unevenly compressed, affecting sealing performance
Solution Approach 1:
The insertion metal fitting is segmented into the cylindrical portion that interfaces with the second mounting member for sealing, and the inward protrusion that creates the sealing rubber storage space. This segmentation allows the sealing rubber to be stored in the space between the inward protrusion and cylindrical portion, enabling even distribution of compressive deformation when the cylindrical portion is bonded by pressure to the second mounting member, thereby maintaining reliable sealing
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 effectively enhances the tensile spring force and sealing performance, preventing noise generation by constraining the main rubber elastic body and allowing even compressive deformation of the sealing rubber, ensuring stable operation under tensile loads.
Implementation Method 1
a main rubber elastic body elastically connecting the first and second mounting members
Implementation Method 2
using the flow behavior of a non-compressible fluid sealed therein
Implementation Method 3
an orifice passage that connects the pressure-receiving chamber and the equilibrium chamber to each other
Implementation Method 4
the cylindrical portion of the second mounting member is bonded by pressure to the insertion metal fitting with a sealing rubber in between in a fluid-tight manner
Data Source
AI summary
A fluid filled vibration damping device including: a first mounting member; a second mounting member having a cylindrical portion; and a main rubber elastic body elastically connecting the first and second mounting members. The first mounting member is fixed to one end of the main rubber elastic body, and an insertion metal fitting in a cylindrical shape is fixed onto an outer peripheral face of another end thereof, and the cylindrical portion of the second mounting member is bonded by pressure to the insertion metal fitting with a sealing rubber in between in a fluid-tight manner. The insertion metal fitting is provided with an inward protrusion where part of a wall portion protrudes inward. A sealing rubber storage space is formed between the inward protrusion and the cylindrical portion of the second mounting member.