Hydraulic Mount Decoupler Using a Polymeric Sheet for Longer Life
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Solution Overview
Problem
Conventional hydraulic mount apparatuses with metallic inserts in the moving member increase manufacturing costs and suffer from chemical reactions with elastomeric materials and magnetorheological fluids, reducing their lifespan.
Innovation Solution
The use of a non-elastomeric polymer sheet as the moving member, secured by a decoupler, minimizes chemical reactions and eliminates the need for metallic inserts, while providing additional damping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic inserts are embedded in the moving member to change stiffness, then the stiffness control is improved, but the manufacturing cost increases
Solution Approach 1:
The patent removes metallic inserts from the moving member, extracting the harmful element that caused chemical reactions and manufacturing complexity. The moving member is made entirely of elastomeric material with varying durometer values to achieve different stiffness levels, eliminating the need for metal embedding while maintaining stiffness control functionality.
Solution Approach 2:
The patent changes the material parameter (durometer value) of the elastomeric moving member to control stiffness. Instead of using metallic inserts to adjust stiffness, different durometer values (e.g., 60 Shore A, 70 Shore A, 80 Shore A) are used to achieve the desired stiffness characteristics, providing a simpler and more cost-effective manufacturing approach.
2Strength
If metallic inserts are used in the moving member, then stiffness adjustment is achieved, but chemical reactions with fluid reduce the lifespan
Solution Approach 1:
The patent extracts metallic inserts from the moving member, eliminating the source of chemical reactions with the magnetorheological fluid. The moving member is constructed entirely from elastomeric material, removing the incompatible metal-elastomer-fluid interface that caused degradation and reduced lifespan.
Solution Approach 2:
The patent creates a homogeneous elastomeric moving member without metallic inserts. This uniform material composition eliminates galvanic corrosion and chemical reactions between dissimilar materials (metal and elastomer) exposed to the magnetorheological fluid, thereby improving reliability and extending the operational lifespan of the hydraulic mount apparatus.
3Force
If elastomeric material is used in the moving member, then damping force is provided, but the material extrudes under pressure reducing life
Solution Approach 1:
The patent applies different durometer values to different regions or portions of the moving member. By varying the local material properties (softer in some areas, harder in others), the moving member provides effective damping force while resisting extrusion under pressure. This localized material differentiation allows the elastomeric material to maintain its damping function without sacrificing structural integrity and lifespan.
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 design prolongs the operational life of the hydraulic mount apparatus by preventing chemical reactions and reducing the need for costly metal inserts, while maintaining effective damping performance.
Implementation Method 1
The magnetorheological fluid composition is disposed in the pumping chamber and the receiving chamber. The magnetorheological fluid composition comprises magnetizable particles dispersed in a non-Newtonian fluid medium and responsive to a magnetic field to change from a first viscosity to a second viscosity.
Implementation Method 2
A moving member of elastomeric material disposed in the pumping chamber attached to the decoupler
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A hydraulic mount apparatus includes a housing having an upper portion and a lower portion disposed on a center axis and defining a housing chamber. A partition member is disposed in the housing chamber dividing the housing chamber into a pumping chamber and a receiving chamber. The pumping chamber extends between the upper portion and the partition member. The receiving chamber extends between the lower portion and the partition member. A decoupler is attached to the partition member separating the pumping chamber and the receiving chamber. A moving member is disposed in the pumping chamber and attached to the decoupler. The moving member is made from a non-elastomeric polymer sheet secured to the decoupler for providing the additional damping force.