Hydraulic Mount Overflow Channel for Wide-Range Vibration Damping
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Solution Overview
Problem
Existing hydraulic bearings for motor vehicle assemblies face challenges in effectively damping vibrations across a wide frequency range, leading to noise and potential cavitation issues due to limited pressure relief and damping capabilities.
Innovation Solution
A hydraulic bearing design featuring a nozzle disk with a damping channel for lower frequency damping and an overflow connection on a clamping disk surface, forming a second damping system to address higher frequencies, which reduces cavitation risk and extends service life by spreading the characteristic curve over a broader frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single damping channel is used to connect working chamber and compensation chamber, then lower frequency vibrations are damped, but higher frequency vibrations are not effectively damped and cavitation occurs
Solution Approach 1:
The single damping channel is segmented into two distinct damping channels with different characteristics. The first damping channel (through the membrane) handles lower frequency vibrations, while the second damping channel (overflow connection) handles higher frequency vibrations. This segmentation allows each channel to be optimized for its specific frequency range, preventing cavitation and extending service life.
Solution Approach 2:
The overflow connection acts as an intermediary pathway that becomes active during high-frequency vibrations when the membrane cannot respond quickly enough. It provides an alternative route for hydraulic fluid exchange, mediating the pressure equalization process and preventing the extreme pressure conditions that lead to cavitation.
2Reliability
If membrane is used to separate working chamber and compensation chamber, then hydraulic fluid exchange is controlled, but the membrane can be covered or closed by movable parts limiting overflow
Solution Approach 1:
The overflow connection is designed in a different spatial dimension - on the disk surface facing away from the membrane - rather than through the membrane itself. This dimensional separation ensures that the overflow connection cannot be blocked by membrane movement, maintaining reliable high-frequency damping without adding complex mechanisms.
3Stress or pressure
If pressure relief valve is integrated into membrane, then excessive pressure is relieved, but the valve adds complexity to the membrane structure
Solution Approach 1:
The pressure relief function is extracted from the membrane structure and implemented separately through the overflow connection on the disk surface. This separation maintains the membrane's simplicity while providing effective pressure relief capability through a dedicated overflow pathway that operates independently of membrane integrity.
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 design achieves enhanced driving comfort and noise reduction while minimizing cavitation, resulting in increased service life and improved vibration damping across a wider frequency range.
Implementation Method 1
A damping channel for fluid communication of the working chamber with the compensation chamber is formed in the nozzle disk, the two chambers, the damping channel and the hydraulic fluid forming a first damping system for damping vibrations with, in particular, lower frequencies
Implementation Method 2
The hydraulic bearing has a second damping system to dampen vibrations with higher frequencies. The second damping system has an overflow connection between the compensation chamber and an absorber channel designed to cancel idle vibrations
Implementation Method 3
The advantage is the creation of a wider characteristic curve spread. In other words, this means that the attenuation extends over a larger frequency range
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a hydraulic bearing for supporting an assembly of a motor vehicle, with a carrying bearing portion (3) and a support portion (4), wherein a working chamber (6) which is fillable with hydraulic fluid is formed in the carrying bearing portion (3) and a compensating chamber (7) which is fillable with hydraulic fluid is formed in the support portion (4), wherein a nozzle disc (2) through which the flow can pass and which delimits the working chamber (6) from the compensating chamber (7) is arranged between the carrying bearing portion (3) and the support portion (4), and wherein a damping duct (14) for the fluidic communication of the working chamber (6) with the compensating chamber (7) is formed in the nozzle disc (2), wherein the two chambers (6, 7), the damping duct (14) and the hydraulic fluid form a first damping system (16) for damping vibrations of in particular lower frequencies, and wherein a second damping system (27) is formed for damping vibrations of higher frequencies. According to the invention, the second damping system (27) has an overflow connection (26) between the compensating chamber (7) and an absorption duct (17) which is designed for absorbing idling vibrations.