Liquid-Sealed Anti-Vibration Device With Rubber Recesses
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Solution Overview
Problem
Conventional liquid-sealed-type anti-vibration devices face challenges in achieving sufficient damping performance and durability due to extreme shear deformation of rubber bodies, leading to fatigue and potential vibration transmission to the cabin, which compromises passenger comfort and vehicle stability.
Innovation Solution
The design incorporates an inner-tube member with an inner-tube rigid protrusion and outer-tube rigid protrusions with a shape of an inward flange, along with ring-shaped cavities in the rubber bodies, to enhance volume change of liquid chambers and disperse shear deformation, while a small-diameter end section facilitates easy assembly and reduces the required press-in force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rubber bodies are fixed to the inner circumferential surfaces of the outer-tube rigid protrusions, then the damping performance is enhanced through increased volume change of liquid chambers, but the radial thickness of the rubber bodies is shortened causing extreme shear deformation and rapid rubber fatigue
Solution Approach 1:
The invention performs preliminary action by forming recesses in the rubber bodies before assembly, which extend beyond the rigid protrusions. This pre-configured geometry allows the rubber to deform more gradually during operation, preventing extreme shear deformation and reducing fatigue while maintaining the volume change necessary for damping performance.
Solution Approach 2:
The invention applies local quality by creating recesses with specific geometries (extending beyond the rigid protrusions) in specific locations of the rubber bodies. This local modification allows the rubber to have different deformation characteristics in different regions, concentrating the deformation in the recess areas while preserving the overall structural integrity and damping function.
2Reliability
If more liquid flows through the limiting passage to achieve sufficient damping performance, then the damping performance is improved, but the volume change of liquid chambers requires larger displacement of rubber bodies increasing shear deformation
Solution Approach 1:
The recesses are pre-formed in the rubber bodies to provide a reservoir for liquid flow. This preliminary configuration allows liquid to accumulate and flow through the limiting passage without requiring extreme displacement of the rubber bodies, thereby maintaining damping performance while reducing shear deformation and fatigue.
3Reliability
If the outer-tube rigid protrusions have large radial height to increase volume change, then the damping performance is improved, but the rubber bodies experience greater shear deformation and stress concentration
Solution Approach 1:
The recesses create local quality in the rubber bodies by providing specific deformation zones. The rubber can deform more effectively within these recess areas, allowing the system to achieve the necessary volume change for damping performance without requiring excessive radial height of the rigid protrusions, thereby reducing overall shear deformation and stress concentration.
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 configuration achieves improved damping performance and durability by reducing rubber fatigue and stress concentration, effectively isolating vibrations and reducing the force needed for assembly, thereby enhancing the overall performance and reliability of the anti-vibration device.
Implementation Method 1
the flow resistance of the liquid flowing through the limiting passage
Implementation Method 2
the liquid chambers 107a, 107b may be effectively compressed or expanded upward or downward
Implementation Method 3
a pair of rubber bodies 104a and 104b for connecting the ends of the outer-tube member 103 to the outer circumferential surface of the inner-tube member 102
Implementation Method 4
the liquid column resonance inside the passage generated as the liquid inside the liquid chambers 107a, 107b flows through the limiting passage 109
Data Source
AI summary
The present invention provides a liquid-sealed-type anti-vibration device that achieves damping performance as well as durability, the device comprising: an inner-tube member; an outer-tube member; first and second rubber bodies; and a fluid chamber, wherein a partition member, which is provided on the inner-tube member and has an inner-tube rigid protrusion and a rubber partition, is provided with a limiting passage, the outer-tube member has first and second outer-tube rigid protrusions having a shape of an inward flange, at least one of the first and second outer-tube rigid protrusions is disposed on the side of liquid chambers, each of the first rubber body and the second rubber body is provided with a ring-shaped cavity extending inside the respective rubber body along the outer circumferential surface of the inner-tube member, the depth of the cavities being configured such that the cavities extend beyond the first outer-tube rigid protrusion or the second outer-tube rigid protrusion, and at least one of the cavities faces one of the liquid chambers.