Anti-vibration Device Guide Portion Cavitation Prevention

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Solution Overview

Problem

The existing anti-vibration devices with valve bodies to prevent cavitation collapse become complex, increasing manufacturing costs and reducing design freedom, while also compromising anti-vibration characteristics.

Innovation Solution

A liquid-sealed anti-vibration device with a cylindrical mounting member, an elastic body, and a partition member that includes a restriction passage with a guide portion to manage liquid flow and reduce pressure fluctuations, preventing cavitation and abnormal noise without adding complexity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a valve body is provided in the restriction passage to limit negative pressure generation, then cavitation and abnormal noise are prevented, but the device structure becomes complex and manufacturing cost increases

Engineering Contradiction:

Improveabnormal noise from cavitation collapseVSAvoidstructure complexity due to valve body

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the valve body component from the restriction passage, replacing it with a simplified structure that achieves the same cavitation prevention function through geometric design of the partition member rather than an additional mechanical component

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the geometric parameters of the partition member, specifically designing the shape and dimensions of the restriction passage opening to control liquid flow and pressure distribution, thereby preventing cavitation without requiring a valve body

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If a valve body is provided in the restriction passage to limit negative pressure generation, then cavitation is prevented, but manufacturing cost increases due to tuning requirements

Engineering Contradiction:

Improvecavitation in main liquid chamberVSAvoidmanufacturing cost and tuning complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The invention removes the valve body component entirely, eliminating the need for complex tuning procedures and reducing manufacturing costs while maintaining cavitation prevention through optimized partition member geometry

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces the expensive, precision-tuned valve body with a simple, cost-effective partition member design that achieves the same protective function without requiring costly manufacturing tolerances or tuning

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Object-affected harmful factors

If a valve body is provided in the restriction passage to limit negative pressure generation, then cavitation is prevented, but design freedom decreases and anti-vibration characteristics may be reduced

Engineering Contradiction:

Improvenegative pressure in main liquid chamberVSAvoiddesign freedom and anti-vibration characteristics

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The invention merges the cavitation prevention function directly into the partition member structure by optimizing its geometry, eliminating the need for a separate valve body and allowing greater design freedom to optimize anti-vibration characteristics

Inventive Principle:

Principle #5Merging (Combining)

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 limits abnormal sound from cavitation collapse while maintaining anti-vibration performance with a simpler structure, reducing manufacturing costs and preserving design flexibility.

Implementation Method 1

both the mounting members are relatively displaced while elastically deforming the elastic body

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

the liquid pressure of the main liquid chamber is fluctuated to circulate the liquid in the restriction passage

Methodology Applied

Scientific EffectPressure fluctuation: Pressure Gradient

Implementation Method 3

a guide portion that is configured to guide the liquid from the other of the first communication portion and the second communication portion to an opposed surface that is opposed to one of the first communication portion and the second communication portion in an inner surface of the restriction passage is disposed

Methodology Applied

Scientific EffectCavitation prevention: Cavitation

Data Source

PatentUS11441634B2Anti-vibration device

Publication Date: 2022.09.13 PROSPIRA CORP

AI summary

In the present invention, a restriction passage (24) includes a first communication portion (26) that is open to a first liquid chamber, a second communication portion (27) that is open to a second liquid chamber, and a main body flow path (25) that is configured to cause the first communication portion (26) and the second communication portion (27) to communicate with each other, and in a portion of the main body flow path (25) connected to at least one of the first communication portion (26) and the second communication portion (27), a guide portion (43) that is configured to guide a liquid from the other of the first communication portion (26) and the second communication portion (27) to an opposed surface (34a) that is opposed to one of the first communication portion (26) and the second communication portion (27) in an inner surface of the restriction passage (24) is disposed.