Hydraulic Mount Unidirectional Damping Membrane
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Solution Overview
Problem
Current engine mounts, such as rubber, hydraulic, and air damper mounts, face challenges in effectively damping engine vibrations due to their cost, performance, and dynamic properties, particularly with air-based mounts exhibiting poor damping at higher frequencies and increased stiffness.
Innovation Solution
A hydraulic mount with a unidirectional damping membrane featuring a one-way closure mechanism, where a soft material closure moves into a membrane hole to allow fluid flow only in one direction, enhancing damping properties across various frequency bands and incorporating metal for dynamic damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air is used as working fluid in air damper mount, then cost is reduced compared to fluid engine mount, but damping performance deteriorates at higher frequencies
Solution Approach 1:
The membrane is divided into multiple regions (first region with first hole, second region with second hole) that operate at different frequency ranges. Each region segments the damping function to handle specific frequency bands, allowing air to provide effective damping in its optimal range while the other region compensates at different frequencies.
Solution Approach 2:
The patent changes physical parameters of the membrane system by creating holes of different sizes (first hole and second hole with different dimensions) and positions. This parameter variation allows the membrane to exhibit different damping characteristics at different frequencies, improving overall damping performance across the frequency spectrum.
2Force
If diameter of mount is increased to increase friction damping, then damping force is improved, but device complexity and size increase
Solution Approach 1:
Instead of uniformly increasing the entire mount diameter, the patent applies local modifications to the membrane by creating specific holes at specific positions with specific sizes. This localized approach to increasing friction damping area allows improved damping force without proportionally increasing overall mount size and complexity.
3Force
If membrane with holes is used to allow fluid flow, then damping is improved, but stiffness decreases
Solution Approach 1:
The membrane's damping function is segmented into multiple regions with different hole configurations. The first region and second region each contribute to damping in different ways, allowing the membrane to maintain overall structural integrity and stiffness while providing sufficient flow paths for damping in each localized area.
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 provides improved damping characteristics by allowing unidirectional fluid flow, reducing dynamic properties, and incorporating metal for enhanced damping, effectively shifting the resonance region to a lower frequency band, thus separating it from vehicle vibratory frequencies.
Implementation Method 1
a hydraulic mount in which a liquid having viscosity is encapsulated to improve vibration damping force
Implementation Method 2
increasing friction damping by increasing the amount of fluid flowing between the operating chambers
Data Source
AI summary
The present disclosure relates to a hydraulic mount having a unidirectional damping membrane. A hole is formed in a membrane and a one-way closure having upper and lower portions, which are different from each other, is inserted into the hole to control a flow of a fluid. The one-way closure means includes: a body which intermittently closes a lower side of the hole formed at a center of the membrane; a column portion which is vertically formed at a center of the body; and a moving closure which is formed at an upper portion of the column portion and closes an upper side of the hole.