Hydraulic Mount Dual Control Units for Vibration Damping
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Solution Overview
Problem
Hydraulic mounts face challenges in providing optimal damping for low-frequency vibrations while maintaining effective isolation for high-frequency vibrations, often resulting in attenuation loss and increased installation space due to the rigidity changes of control membranes.
Innovation Solution
The hydraulic mount incorporates two control units arranged in series, with an intermediate chamber filled with an incompressible or compressible medium, allowing the first control unit to block low-frequency vibrations and the second control unit to isolate high-frequency vibrations, optimizing damping and isolation independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the control membrane is made rigid to isolate high-frequency vibrations, then high-frequency isolation is improved, but damping of low-frequency vibrations is reduced
Solution Approach 1:
The control membrane is divided into two separate control units (first control unit and second control unit) arranged in series. The first control unit handles low-frequency vibrations with a softer membrane design to maintain damping, while the second control unit handles high-frequency vibrations with a stiffer membrane design to maintain isolation. This segmentation allows each unit to be optimized for its specific frequency range without compromising the other function.
2Object-affected harmful factors
If the control membrane stiffness is increased to improve high-frequency isolation, then high-frequency vibration transmission is reduced, but the installation space increases
Solution Approach 1:
By segmenting the control membrane into two specialized units, each unit can be compactly designed for its specific function. The first control unit with softer membrane requires less space than a uniformly stiff membrane would, while the second control unit with stiffer membrane is optimized for high-frequency isolation. The series arrangement allows compact integration without requiring excessive installation space.
3Loss of energy
If the control membrane is made softer to improve low-frequency damping, then low-frequency vibration damping is improved, but high-frequency isolation is reduced
Solution Approach 1:
The control membrane is segmented into two control units with different stiffness characteristics. The first control unit has a softer membrane design that excels at damping low-frequency vibrations, while the second control unit has a stiffer membrane design that provides effective isolation for high-frequency vibrations. This segmentation allows the system to achieve both damping and isolation performance that would be impossible with a single uniform membrane.
4Device complexity
If a single control membrane design is used, then device complexity is reduced, but the ability to independently optimize damping and isolation is lost
Solution Approach 1:
The control membrane is divided into two control units that can be designed with different stiffness characteristics. The first control unit is optimized for low-frequency damping with a softer membrane, while the second control unit is optimized for high-frequency isolation with a stiffer membrane. This segmentation enables independent optimization of damping and isolation performance for different frequency ranges, providing frequency-dependent control capability that a single uniform membrane 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
This configuration effectively prevents damping loss for low-frequency vibrations with large amplitudes and ensures isolation of high-frequency vibrations, achieving improved damping and reduced noise emissions without increasing the hydraulic mount's installation space.
Implementation Method 1
When the hydraulic mount is loaded, a force acts longitudinally on the spring, causing it to deform elastically. This deformation is also known as spring compression. The working chamber is at least partially enclosed by the spring, so the spring's compression reduces the chamber's volume.
Implementation Method 2
The throttle channel presents a flow resistance to the flowing hydraulic fluid. Therefore, the flow through this specially designed throttle channel generates dissipation and thus damping work.
Implementation Method 3
The compensation chamber is preferably provided with at least one membrane-like deformable wall part, in particular a rolling membrane, so that the part of the hydraulic fluid flowing into the compensation chamber can be absorbed.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a hydraulic mount (2) having a suspension spring (36), a working chamber (4) that is at least partially surrounded by the suspension spring (36) and filled with a hydraulic fluid, a compensation chamber (6), and a restriction channel (10) for exchanging hydraulic fluid, configured between the working chamber (4) and the compensation chamber (6), the hydraulic mount (2) further comprising: an intermediate chamber (22), a first mobile control unit (32) which is disposed between the working chamber (4) and the intermediate chamber (22) and separates said two chambers (4, 22) from each other, and a second mobile control unit (42), which forms a wall portion (48) of the intermediate chamber (22). The invention also relates to a motor vehicle having a hydraulic mount (2) of this type.