Vibration Isolator Flow Changing Protrusion
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Solution Overview
Problem
Conventional vibration isolators face challenges in simplifying their structure and manufacturing process while maintaining product features, and they experience increased dynamic spring constants due to clogging and unintentional vibrations, which can affect ride comfort and noise levels.
Innovation Solution
A vibration isolator design featuring a communicating passage with a flow-changing protrusion and guide surface that alters liquid flow direction, increasing pressure loss for absorbing vibrations, and a restriction passage for resonance absorption, eliminating the need for a plunger member to simplify structure and manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plunger member is used to switch restriction passages, then vibration attenuation performance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts and eliminates the plunger member from the system by redesigning the restriction passage structure. Instead of using a moving plunger to switch between restriction passages, the patent creates a fixed restriction passage with specific geometric features (protrusions and grooves) that achieve vibration attenuation without moving parts, thereby simplifying the overall device structure while maintaining performance
Solution Approach 2:
The invention inverts the conventional approach by replacing a movable switching mechanism (plunger) with a fixed geometric structure (protrusions and grooves in the restriction passage). This inversion transforms the problem from active switching to passive flow guidance, eliminating the need for complex actuation mechanisms while achieving the desired vibration attenuation effect
2Reliability
If restriction passage dimensions are optimized for resonance frequency, then vibration attenuation is improved, but susceptibility to clogging by high-frequency vibrations increases
Solution Approach 1:
The invention applies local quality by creating non-uniform geometric features (protrusions and grooves) at specific locations within the restriction passage. These localized structural variations create regions of different flow resistance and pressure distribution, allowing the passage to handle both resonance-frequency vibrations (through overall dimensions) and high-frequency vibrations (through local geometric features that prevent clogging)
Solution Approach 2:
The invention adds geometric complexity in the radial dimension by incorporating protrusions and grooves that extend radially from the passage wall. This dimensional addition creates three-dimensional flow patterns that prevent liquid from adhering to the passage walls during high-frequency vibrations, thereby preventing clogging while maintaining the resonance-frequency attenuation performance determined by the axial dimensions
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 design effectively absorbs and attenuates vibrations across various frequencies, suppresses abnormal noise, and limits the increase in dynamic spring constant, ensuring improved ride comfort and product features.
Implementation Method 1
increasing pressure loss for absorbing vibrations
Implementation Method 2
absorbs and attenuates vibrations
Implementation Method 3
change the flow of the liquid flowing in the communicating passage in the axial direction
Implementation Method 4
Resonance frequencies of the first restriction passage and the second restriction passage are set (tuned) to frequencies of the different types of vibrations
Data Source
AI summary
A vibration isolator (10) includes a first attachment member (11), a second attachment member (12), an elastic body (13), and a partition member (16) configured to partition a liquid chamber in the first attachment member in which a liquid (L) is sealed into a first liquid chamber (14) and a second liquid chamber (15). A communicating passage (30) configured to communicate the first liquid chamber with the second liquid chamber is provided in the partition member. A flow changing protrusion (31) is provided at an inner circumferential surface (30a) of the communicating passage. A guide surface (32) opposite to the communicating passage and intersecting the axial direction (O) of the communicating passage is provided at the flow changing protrusion. A passing hole (34) which is open toward both sides in the axial direction is formed by a projecting end (31b) of the flow changing protrusion and another place on the inner circumferential surface (30b) of the communicating passage. The flow changing protrusion changes the flow of the liquid flowing in the communicating passage and reaching the guide surface toward the projecting end. The guide surface is formed in a concave curved surface shape which is recessed in the axial direction.