Vibration Isolator Axial Fluid Chamber Design
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Solution Overview
Problem
Conventional vibration isolators face challenges in maintaining the performance of the elastic body over a long period due to excessive deformation and load concentration, which affects their vibration attenuation capabilities.
Innovation Solution
The vibration isolator design features a rectangular outer tube with elongated side parts and inclined partition walls, allowing for extensive deformation of pressure-absorbing fluid chambers along the axial direction, reducing elastic body deformation and load concentration through stopper parts that restrict additional displacement, thereby maintaining performance over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pressure-absorbing fluid chambers are made compact, then the vibration isolator size is reduced, but the fluid chambers cannot be sufficiently expanded and contracted to absorb vibrations
Solution Approach 1:
The inner tube extends along the overall lengths of the fluid chambers in the axial direction, enabling the chambers to expand and contract primarily in the axial dimension. This dimensional orientation allows sufficient vibration absorption capacity while maintaining a compact overall isolator size, as the expansion occurs along the tube's length rather than radially outward.
2Reliability
If the elastic body is highly deformable, then vibration absorption is improved, but the elastic body performance degrades quickly due to excessive deformation
Solution Approach 1:
The fluid chambers are configured to expand and contract along the axial direction of the inner tube rather than in radial directions. This axial expansion utilizes the tube's overall length, allowing the chambers to achieve necessary volume changes for vibration absorption while the elastic body undergoes controlled deformation along this extended dimension, reducing stress concentration and maintaining performance over time.
3Reliability
If the fluid chambers expand significantly, then vibration attenuation is improved, but the load on the elastic body increases
Solution Approach 1:
The fluid chambers expand and contract along the axial direction of the inner tube, utilizing the overall length of the tube. This axial expansion allows the chambers to achieve significant volume changes for effective vibration attenuation while distributing the mechanical load along the extended axial dimension, reducing peak stress on the elastic body and enabling sustained performance.
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 enhances the vibration isolator's ability to absorb and attenuate vibrations effectively while maintaining the elastic body's performance for a longer duration, improving handleability and attenuation performance by distributing loads and preventing local concentration.
Implementation Method 1
the inner tube and the outer tube are relatively displaced in the sandwiching direction while elastically deforming the elastic body
Implementation Method 2
The fluid flows through the first restricting passages, and the vibration is absorbed and attenuated
Data Source
AI summary
A vibration isolator includes an inner tube (11), an outer tube (12) surrounding the inner tube (11) from a radial outer side of the inner tube, and an elastic body (13) coupling the inner tube (11) and the outer tube (12). Multiple pressure-absorbing fluid chambers (35, 36), whose walls are partly formed by the elastic body (13), are disposed inside the outer tube (12), and include a pair of first pressure-absorbing fluid chambers (35) interconnected through first restricting passages (37), and a second pressure-absorbing fluid chamber (36) connected to an auxiliary fluid chamber (28), in which a fluid is filled, through a second restricting passage. The pair of first pressure-absorbing fluid chambers (35) are disposed to sandwich the inner tube (11) therebetween. The second pressure-absorbing fluid chamber (36) is arranged in parallel to the inner tube (11) in an orthogonal direction (C) perpendicular to both an axial direction of the inner tube (11) and a sandwiching direction (B) in which the inner tube (11) is sandwiched between the pair of first pressure-absorbing fluid chambers (35). The inner tube (11) runs along overall lengths of the pair of first pressure-absorbing fluid chambers (35) and the second pressure-absorbing fluid chamber (36) in the axial direction.