Hydraulic Mount With Decoupler for Vibration Dampening
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Solution Overview
Problem
Existing vehicle mount systems fail to effectively dampen vibrations across varying amplitudes and frequencies, leading to inefficiencies in isolating and managing vibrational loads between vehicle components.
Innovation Solution
A hydraulic mount system comprising elastomeric members, an inner tube assembly, and a decoupler assembly that includes a fluid track and annular channel, allowing for fluid flow between chambers to dampen vibrations, with a decoupler ring that compensates for small amplitude movements and enables fluid flow at larger amplitudes to manage vibrational loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional hydraulic mount system is used, then the structure is simple, but it fails to effectively dampen vibrations across varying amplitudes and frequencies
Solution Approach 1:
The mount is divided into two separate assemblies: an elastomeric mount member and a hydraulic mount member. The elastomeric member handles low-amplitude vibrations through material damping, while the hydraulic member manages high-amplitude vibrations through fluid flow resistance. This segmentation allows each component to specialize in specific vibration regimes, improving overall effectiveness without requiring a single complex system to handle all conditions.
Solution Approach 2:
The system combines two different material systems: elastomeric material (rubber-like polymer) and hydraulic fluid. The elastomeric member provides viscoelastic damping for small vibrations, while the hydraulic fluid provides viscous damping for large vibrations. This composite approach leverages the complementary damping characteristics of different materials to achieve broad-spectrum vibration control.
2Reliability
If the elastomeric mount member absorbs vibrations, then low amplitude vibrations are isolated, but the system cannot effectively manage high amplitude vibrations
Solution Approach 1:
The system dynamically switches between two damping mechanisms based on vibration amplitude. At low amplitudes, the elastomeric member's viscoelastic properties provide damping. At high amplitudes, the hydraulic fluid's viscous resistance becomes dominant. This dynamic adaptation allows the system to maintain effectiveness across a wide range of vibration conditions rather than being optimized for a single amplitude range.
Solution Approach 2:
The hydraulic fluid acts as an intermediary that engages when vibration amplitudes exceed the elastomeric member's effective range. The fluid flow through restricted passages provides additional damping resistance specifically when needed for high-amplitude vibrations, bridging the gap between what the elastomeric material can handle and the total vibration management requirement.
3Reliability
If a single chamber design is used, then the structure is simple, but it cannot provide effective dampening across varying frequencies
Solution Approach 1:
The fluid damping system is segmented into two separate chambers: a first chamber and a second chamber, each with its own fluid passage and damping characteristics. This allows independent optimization of each chamber for different frequency ranges. The first chamber can be tuned for lower frequencies while the second chamber handles higher frequencies, providing broad-spectrum vibration dampening that a single chamber cannot achieve.
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 hydraulic mount system effectively isolates vibrations at low amplitudes and dampens them at higher amplitudes, providing efficient vibration management across a range of frequencies, enhancing the coupling and stability of vehicle components.
Implementation Method 1
The elastomeric mount member absorbs vibrations deflected between the first and the second component
Implementation Method 2
the elastomeric mount member exerts a load onto the hydraulic mount member which pushes fluid between two chambers to dampen vibrations exerted by the components
Data Source
AI summary
The present disclosure relates to an hydraulic mount for coupling first second components in a vehicle. The mount has a first elastomeric member defining a first portion of a first chamber, and a second elastomeric member defining a second portion of the first chamber and a second chamber. The chambers are each able to retain fluid in a liquid seal manner. An inner tube assembly defines an opening for receiving a bolt. The elastomeric members may be fixedly secured to an outer surface of the inner tube assembly. An inner ring is fixedly coupled to the inner tube assembly at a position between the two chambers. The second elastomeric member is fixedly secured to an outer surface of the inner ring. A decoupler is fixedly disposed within the inner ring and adapted to move between rigid surfaces adjacent the first and second chambers.