Hydraulic Vibration Mount Structure for Quiet Movable Member Abutment
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Solution Overview
Problem
The existing vibration-proof devices experience abnormal noise due to the movable member abutting the wall surface of the accommodation chamber when vibration is input from the vibration generation part.
Innovation Solution
A vibration-proof device with a movable member featuring inclined protrusion parts on its outer circumferential edge, where the radial width of the root part is smaller than the axial length, and straight protrusion parts on the inner side, allowing for increased deformation time and reduced reaction force, thereby minimizing noise and durability degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the movable member is made to abut the wall surface of the accommodation chamber to absorb vibration, then vibration damping performance is improved, but abnormal noise occurs due to the abutment
Solution Approach 1:
The invention applies curvature by forming an inclined protrusion part on the movable member instead of using a flat surface. The inclined surface allows the movable member to gradually approach and abut the accommodation chamber wall, transforming the abrupt impact into a smoother contact that reduces noise while maintaining vibration damping effectiveness.
Solution Approach 2:
The invention introduces a dimensional change by creating an inclined protrusion part that extends in both radial and axial directions. This three-dimensional structure allows the movable member to deform and abut the wall surface in a controlled manner, increasing deformation time and reducing the harmful noise generated during abutment while maintaining effective vibration absorption.
2Productivity
If the movable member deforms rapidly to absorb vibration energy, then vibration absorption efficiency is improved, but the reaction force increases causing noise and durability issues
Solution Approach 1:
The inclined protrusion part is pre-formed on the movable member to create a gradual deformation path. When vibration occurs, the movable member follows this pre-designed inclined surface, which extends the deformation time and reduces the peak reaction force, thereby preventing noise and durability degradation while maintaining vibration absorption efficiency.
Solution Approach 2:
The invention makes the movable member dynamically deformable by incorporating the inclined protrusion part that allows controlled deformation in the axial direction. This dynamic structure enables the movable member to adapt its deformation characteristics during vibration, extending the deformation time and reducing peak forces while maintaining effective vibration energy absorption.
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 effectively absorbs and dampens vibrations, preventing abnormal noise and enhancing durability by distributing the reaction force and increasing deformation time, while also allowing for easier molding and uniform abutment on the accommodation chamber wall.
Implementation Method 1
an elastic body configured to connect both the attaching members to each other
Implementation Method 2
when the liquid pressure in the main liquid chamber fluctuates on the basis of an input from the vibration generation part
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A vibration-proof device includes a tubular first attaching member connected to one of a vibration generation part and a vibration reception part, and a second attaching member connected to the other thereof; an elastic body configured to connect both the attaching members to each other; a partition member configured to divide a liquid chamber in the first attaching member in which liquid is sealed into a main liquid chamber having the elastic body as a part of a wall surface, and an auxiliary liquid chamber; and a movable member (40) accommodated in an accommodation chamber provided in the partition member so as to be deformable or displaceable in an axial direction of the first attaching member. An inclined protrusion part (42) is formed on the outer circumferential edge portion of the movable member (40). A width (W) in the radial direction of a root part of the inclined protrusion part is smaller than a length (H) in the axial direction from the root part to a distal end portion of the inclined protrusion part.