Split Outer Tube Vibration Damping Device Noise Suppression
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Solution Overview
Problem
Conventional vibration-damping devices generate noise due to fluctuations in liquid pressure and vibration, and shock waves caused by cavitation, which are not effectively absorbed, leading to noise propagation and potential deterioration of damping performance.
Innovation Solution
The vibration-damping device is configured with a split outer tube and a second rubber elastic body that absorbs vibrations and shock waves, allowing for increased thickness to enhance durability and noise suppression, while the second rubber elastic body is positioned inside the main fluid chamber to absorb shock waves directly, preventing noise transmission through the outer tube.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of the second rubber elastic body is increased to improve noise suppression, then the damping performance is improved, but the device complexity increases
Solution Approach 1:
The outer tube is divided into a first outer tube member and a second outer tube member that are coupled together. The second rubber elastic body is positioned between these two members, allowing the noise suppression function to be localized to a specific segment rather than requiring the entire structure to be thickened or complexified.
Solution Approach 2:
The second rubber elastic body acts as an intermediary element between the first and second outer tube members. It absorbs vibrations and shock waves generated by liquid pressure fluctuations and cavitation, preventing these harmful factors from propagating through the outer tube while maintaining a relatively simple overall device structure.
2Object-affected harmful factors
If the second rubber elastic body is positioned inside the main fluid chamber to absorb shock waves directly, then the noise suppression is improved, but the reliability deteriorates due to potential deterioration of damping performance
Solution Approach 1:
The second rubber elastic body is positioned at a specific location inside the main fluid chamber where it can directly absorb shock waves generated by cavitation. This localized placement allows the rubber elastic body to selectively target and absorb harmful shock waves while maintaining the overall damping performance of the vibration-damping device.
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 effectively suppresses noise generation and maintains damping performance by absorbing vibrations and shock waves, ensuring the durability of the rubber elastic body and preventing noise transmission to the attaching bracket.
Implementation Method 1
a second rubber elastic body disposed between the second end of the first outer tube member and the first end of the second outer tube member
Implementation Method 2
this vibration can be absorbed by the second rubber elastic body, and generation of a noise can be suppressed
Implementation Method 3
a first rubber elastic body which elastically connects the outer tube and the attaching member together
Implementation Method 4
a first rubber elastic body which elastically connects the outer tube and the attaching member together, and closes an opening at a first end
Implementation Method 5
a diaphragm which closes an opening at a second end in which the other end of the outer tube in the direction of the axis
Implementation Method 6
a partition member which partitions the inside of the outer tube into a main fluid chamber having the first rubber elastic body at a portion of a partition wall, and an auxiliary fluid chamber having the diaphragm at a portion of a partition wall
Data Source
AI summary
An outer tube (11) of a vibration-damping device (10) is split into a first outer tube member (21) at a first end along the direction of an axis (O), and a second outer tube member (22) at a second end. The second end of the first outer tube member (21) in the direction of the axis (O), and the first end of the second outer tube member (22) in the direction of the axis (O) overlap each other in a radial direction of the outer tube (11) with the second rubber elastic body therebetween (23). Through this configuration, the generation of a noise from the vibration-damping device can be suppressed.