Vibration Damping Device with Vortex Chamber and Fine Holes
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Solution Overview
Problem
Conventional vibration damping devices with valve bodies are complex, increasing manufacturing costs and reducing design freedom, which can lead to compromised vibration damping characteristics and abnormal sound due to cavitation collapse.
Innovation Solution
A vibration damping device with a tubular first mounting member, a second mounting member, an elastic body, and a partition member that includes a restricted passageway with fine holes and a vortex chamber, forming a swirling flow to manage liquid circulation and suppress cavitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a valve body is provided in the restricted passageway to suppress negative pressure conversion, then abnormal sound from cavitation collapse is reduced, but the structure becomes complicated and manufacturing costs increase
Solution Approach 1:
The invention extracts and eliminates the valve body component from the system. Instead of using a separate valve body to control liquid flow and prevent negative pressure, the patent integrates the flow control function directly into the restricted passageway structure itself, thereby removing the need for the complex valve body assembly while maintaining the ability to suppress cavitation collapse and abnormal sound
Solution Approach 2:
The invention merges the valve function with the restricted passageway structure. The partition member that creates the restricted passageway also incorporates the flow control capability, combining what were previously separate components (valve body and passageway) into a single integrated structure, thus reducing overall device complexity while achieving the same harmful factor suppression
2Reliability
If a valve body is provided in the restricted passageway, then negative pressure conversion is suppressed, but manufacturing costs increase due to complex structure and acid tuning requirements
Solution Approach 1:
The invention removes the valve body component that required acid tuning and complex manufacturing processes. The restricted passageway is formed directly in the partition member through simpler manufacturing methods, eliminating the need for separate valve body fabrication, assembly, and acid tuning operations, thereby reducing manufacturing costs while maintaining reliability
Solution Approach 2:
The invention changes the geometric parameters of the restricted passageway (cross-sectional area, length, shape) to achieve the desired flow control characteristics. By optimizing these dimensional parameters during the molding or machining of the partition member, the patent achieves reliable negative pressure suppression without requiring complex valve bodies or post-manufacturing acid tuning adjustments
3Reliability
If a valve body is provided in the restricted passageway, then negative pressure conversion is suppressed, but the degree of freedom of design is reduced and vibration damping characteristics may be compromised
Solution Approach 1:
The invention merges the valve function with the partition member structure, allowing the restricted passageway to be optimally positioned and dimensioned within the overall vibration damping device design. This integration provides greater design freedom compared to adding a separate valve body, as the passageway can be seamlessly incorporated into the partition member geometry without compromising vibration damping characteristics
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 solution effectively suppresses abnormal sound caused by cavitation collapse while maintaining vibration damping characteristics with a simple structure.
Implementation Method 1
an elastic body that elastically couples the mounting members; when vibrations are input, the mounting members are displaced relative to each other while elastically deforming the elastic body
Implementation Method 2
a liquid pressure of the main liquid chamber is changed. A liquid circulates through the restricted passageway. Thereby, the vibrations are absorbed and damped
Implementation Method 3
a vortex chamber that forms a swirling flow of the liquid depending on the flow velocity of the liquid from the other of the first communication part and the second communication part
Data Source
AI summary
A restricted passageway (24) is provided with a first communication part (26) which is formed in a first barrier wall (34) facing a first liquid chamber and opens to the first liquid chamber, a second communication part (27) which is formed in a second barrier wall (35) facing a second liquid chamber and opens to the second liquid chamber, and a main body flow path (25) that is configured to cause the first communication part (26) and the second communication part (27) to communicate with each other. At least one of the first communication part (26) and the second communication part (27) includes a plurality of fine holes (26a) that pass through the first barrier wall (34) or the second barrier wall (35). A vortex chamber (29) is disposed in a connection portion with at least one of the first communication part (26) and the second communication part (27) on the main body flow path (25), figured to form the swirling flow of a liquid depending on a flow velocity of the liquid from the other of the first communication part (26) and the second communication part (27), and is configured to cause the liquid to flow out through the fine holes (26a).