Hydraulic Vibration Mount with Multi-Chamber Stiffness Control
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Solution Overview
Problem
Conventional vibration-damping devices tend to stiffen when subjected to vibrations, compromising their damping performance.
Innovation Solution
The vibration-damping device incorporates a cylindrical outer mounting member, inner mounting member, and a pair of main body rubbers with a partition member that divides the liquid chamber into multiple compartments, utilizing different restriction passages to achieve liquid column resonance and distribute hydraulic pressure effectively, thereby reducing dynamic stiffness and maintaining excellent damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional vibration-damping device uses a single liquid chamber with restriction passages, then damping performance is achieved, but the device tends to stiffen when vibration is input
Solution Approach 1:
The liquid chamber is divided into multiple independent liquid chambers (first liquid chamber, second liquid chamber, third liquid chamber) separated by partition members. Each chamber has its own restriction passages, creating multiple independent liquid columns that resonate at different frequencies. This segmentation prevents the entire chamber from stiffening uniformly when vibration is input, as each segment responds independently to different frequency components of the vibration.
Solution Approach 2:
The partition members are designed with elastic portions that can deform dynamically in response to vibration input. This elasticity allows the partition members to adapt their stiffness characteristics based on the vibration frequency and amplitude, maintaining optimal damping performance across varying vibration conditions without causing excessive overall stiffening of the device.
2Reliability
If multiple liquid chambers with different resonance frequencies are used, then damping performance across wide frequency range is improved, but device complexity increases
Solution Approach 1:
Multiple liquid chambers are arranged concentrically around a common central axis, with each chamber nested within the overall cylindrical structure. The partition members are disposed at intervals along the axial direction, creating a compact nested configuration where first, second, and third liquid chambers occupy different radial and axial positions. This nesting approach achieves multi-frequency damping capability while maintaining a compact overall device size and reasonable structural complexity.
3Strength
If partition members with elastic portions are used, then stiffness increase is inhibited, but manufacturing complexity increases
Solution Approach 1:
The partition members are constructed as composite structures combining rigid body portions (for structural support and chamber definition) and elastic portions (for dynamic adaptation and stiffness control). This composite design allows each partition member to function as an integrated component that provides both structural integrity and vibration-dependent stiffness modulation, simplifying manufacturing compared to assembling separate rigid and elastic elements.
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 inhibits an increase in stiffness during vibrations while providing excellent damping performance across a wide range of frequencies, allowing for miniaturization and improved ride comfort by equalizing resonance frequencies and reducing dynamic stiffness.
Implementation Method 1
When a vibration is input, a liquid flows between the first liquid chamber and the second liquid chamber through the restriction passage, thereby damping and absorbing the input vibration
Implementation Method 2
distribute hydraulic pressure effectively, thereby reducing dynamic stiffness
Implementation Method 3
a pair of main body rubbers which connect between the outer mounting member and the inner mounting member
Implementation Method 4
damping and absorbing the input vibration
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This vibration-damping device is configured such that an outer mounting member (11), an inner mounting member (12), or a partition member (16) has formed therein: a first restriction passage (23) for providing communication between a fourth liquid chamber (21) and a second liquid chamber (15) or a third liquid chamber (20); and a second restriction passage (24) for providing communication between the second liquid chamber (15) and the third liquid chamber (20). The flow resistance of the first restriction passage (23) and that of the second restriction passage (24) are different.