Vibration-Damping Device Flow Changing Protrusion
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Solution Overview
Problem
Conventional vibration-damping devices with valve bodies have complex structures, making tuning difficult and prone to performance degradation over time, which can lead to abnormal noise and reduced ride quality due to negative pressure generation in the main liquid chamber.
Innovation Solution
A vibration-damping device with a simple structure that uses a flow changing protrusion instead of a valve body to manage liquid flow between the main and auxiliary liquid chambers, preventing negative pressure and maintaining stable damping performance by controlling pressure loss through flow manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a valve body is provided in the limiting passage to prevent negative pressure, then negative pressure generation is prevented, but the structure becomes complicated and tuning becomes difficult
Solution Approach 1:
The invention extracts and eliminates the valve body component from the limiting passage, replacing it with a flow changing protrusion that is integrally formed with the partitioning member. This removes the complex valve mechanism while retaining the negative pressure prevention function through flow manipulation.
Solution Approach 2:
The flow changing protrusion is integrally formed with the partitioning member, merging two previously separate components (valve body and partitioning member) into a single integrated structure. This simplifies the overall device structure while maintaining the required functionality.
2Reliability
If a valve body is provided to prevent negative pressure, then negative pressure is prevented, but the structure becomes complicated and manufacturing becomes more difficult
Solution Approach 1:
The flow changing protrusion is integrally formed with the partitioning member through molding or machining operations, reducing the number of parts that need to be manufactured separately and assembled. This integral construction significantly improves manufacturing ease compared to assembling a separate valve body.
3Reliability
If a valve body is used to prevent negative pressure, then negative pressure is prevented, but abnormal noise may be generated due to sudden opening and closing
Solution Approach 1:
By removing the valve body component entirely and replacing it with a fixed flow changing protrusion, the invention eliminates the sudden opening and closing action that causes abnormal noise. The flow is continuously guided around the protrusion, preventing cavitation and noise generation.
4Reliability
If a valve body is provided to prevent negative pressure, then negative pressure is prevented, but the structure becomes complicated and tuning becomes difficult over time
Solution Approach 1:
The invention removes the valve body and its associated tuning mechanisms, replacing them with a fixed flow changing protrusion. This eliminates the need for complex tuning operations while maintaining reliable negative pressure prevention through geometric flow control.
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 achieves stable damping performance over time with reduced abnormal noise and prevents negative pressure in the main liquid chamber, facilitating easy manufacturing and improved ride quality.
Implementation Method 1
a flow changing protrusion which changes a flow of the liquid flowing into the limiting passage from the main liquid chamber
Implementation Method 2
an elastic body that couples the first attachment member and the second attachment member together
Implementation Method 3
the liquid pressure of the main liquid chamber being fluctuated such that the liquid is circulated through the limiting passage
Data Source
Figure 1
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Figure 3
AI summary
A vibration-damping device (10) includes a first attachment member (11), a second attachment member (12), an elastic body, and a partitioning member (16). A limiting passage (30) that allows a main liquid chamber (14) and an auxiliary liquid chamber (15) to communicate with each other is formed in the partitioning member (16). An inner peripheral surface of the limiting passage (30) is provided with a flow changing protrusion (31) that protrudes toward an inner side in a radial direction of the limiting passage (30) and that changes the flow of a liquid (L) that flows into the limiting passage (30) from the main liquid chamber (14) and flows through the limiting passage (30) in an axial direction of the limiting passage (30). In a vertical cross-sectional view passing through an axis of the limiting passage (30) and through the flow changing protrusion (31), the limiting passage (30) and the flow changing protrusion (31) have symmetrical shapes with respect to the axis. A protruding end of the flow changing protrusion (31) forms an inner peripheral edge of a passage hole (31 c) that is open on both sides in the axial direction.