Hydraulic Mount Nozzle Disc Sealing for Fluid Leakage
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Solution Overview
Problem
Existing hydraulically damping mounts for motor vehicle units face challenges in maintaining effective vibration damping due to fluid leakage and frequency shifting, which affects the performance and reliability of the damping mechanism.
Innovation Solution
A separation device with a first and second nozzle disc made of fibre-reinforced plastic, combined with a thermoplastic elastomer sealing member, forms a reliable damping channel that prevents fluid leakage and allows bidirectional flow, enhancing damping performance by using a two-component injection moulding process for manufacturing and ensuring a secure interference fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damping channel is formed between nozzle discs to connect working chamber and compensation chamber, then fluid flow for vibration damping is enabled, but fluid leakage occurs reducing damping reliability
Solution Approach 1:
A sealing membrane is introduced to seal the damping channel between the first and second nozzle discs. The membrane acts as a flexible barrier that prevents fluid leakage while allowing the damping channel to function, thereby resolving the contradiction between enabling fluid flow for damping and preventing fluid leakage.
Solution Approach 2:
The sealing membrane serves as an intermediary element between the working chamber and compensation chamber. It mediates the fluid flow by allowing controlled passage through the damping channel while preventing uncontrolled leakage, thus improving damping reliability without compromising the damping function.
2Reliability
If damping channel diameter is reduced to increase mechanical transmission, then vibration damping performance improves, but manufacturing precision requirements increase
Solution Approach 1:
The sealing membrane compensates for manufacturing tolerances in the damping channel. By providing a flexible sealing interface, the membrane allows for smaller diameter damping channels to be manufactured with relaxed tolerance requirements, as the membrane can adapt to slight variations in channel dimensions while maintaining effective sealing and damping performance.
3Strength
If fibre-reinforced plastic is used for nozzle discs to increase strength, then structural integrity improves, but sealing reliability may deteriorate
Solution Approach 1:
The nozzle discs are made of fibre-reinforced plastic, combining strength and stiffness. The sealing membrane, made of a different material, is introduced to provide the sealing function. This composite approach allows the nozzle discs to be optimized for structural strength while the sealing membrane handles the sealing requirement, resolving the contradiction between strength and sealing reliability.
Solution Approach 2:
The sealing membrane acts as an intermediary between the fibre-reinforced plastic nozzle discs. It compensates for any sealing deficiencies in the rigid, strength-optimized nozzle discs, allowing the use of high-strength composite materials without compromising sealing reliability.
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 solution provides improved damping performance by preventing fluid leakage and frequency shifting, resulting in better vibration absorption and decoupling of high-frequency vibrations, while maintaining structural integrity and cost-effectiveness.
Implementation Method 1
the sealing member seals the damping channel reliably and with a high process stability and thus prevents fluid from escaping from the damping channel
Implementation Method 2
the first material is a fibre-reinforced plastic, and the second material is a thermoplastic elastomer. A separation device made of fibre-reinforced plastic has a low weight and at the same time a high strength against the hydraulic pressure occurring in the working chamber
Implementation Method 3
A sealing member made of thermoplastic elastomer has sufficient sealing properties to seal the damping channel
Implementation Method 4
The damping of the vibrations introduced by the motor vehicle unit is performed by the hydraulic system consisting of the working chamber, the compensation chamber and the damping channel. The vibrations introduced cause the supporting spring to move, thereby creating hydraulic pressure inside the working chamber. As a result of the pressure, the fluid flows from the working chamber via the damping channel into the compensation chamber
Data Source
AI summary
A separation device for separating a working chamber and a compensation chamber of a hydraulically damping mount includes a first nozzle disc and a second nozzle disc made of a first material and forming a damping channel interconnecting the working chamber and the compensation chamber. The first nozzle disc may include a sealing member made of a second material and abut the second nozzle disc to seal the damping channel. A hydraulically damping mount for mounting a motor vehicle unit may having a separating device.