Coaxial Vibration Damper with Axial Separating Element
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Solution Overview
Problem
Existing vibration dampers, particularly twin-tube configurations, face issues with gas bubble release and foaming due to direct contact between oil and gas, leading to reduced reliability and increased noise during cold operation.
Innovation Solution
A vibration damper design featuring a coaxially arranged external and internal tube with an annular gap forming a compensation chamber, where a separating element axially displaces to separate damper oil from damper gas in a fluid-tight manner, preventing foaming and noise by using sealing lips and compression chambers for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct contact between oil and gas is allowed in the compensation chamber, then the structure is simple and manufacturing is easy, but gas bubbles are absorbed by the oil causing foaming and reduced reliability
Solution Approach 1:
The compensation chamber is segmented into an upper gas region and a lower oil region using a separating element. This segmentation prevents direct contact between gas and oil, eliminating foaming while maintaining a relatively simple overall structure. The separating element divides the chamber into functional zones without requiring complete structural redesign.
Solution Approach 2:
A separating element acts as an intermediary component between the gas and oil in the compensation chamber. This intermediary prevents harmful direct contact between the two fluids while allowing each to perform its function independently, thus improving reliability without significantly complicating the device.
2Reliability
If separating element is added to separate oil and gas, then foaming is prevented and reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The separating element can be implemented as a flexible membrane or thin film structure that separates oil and gas. This approach minimizes material usage and manufacturing complexity compared to rigid separators, while still achieving the required fluid separation function effectively.
Solution Approach 2:
The separating element serves as a simple intermediary component that can be manufactured as a standalone part. By designing it as a discrete element rather than integrating separation functionality into existing components, manufacturing remains relatively straightforward while achieving the reliability improvement.
3Object-affected harmful factors
If separating element with sealing lips is used, then sealing efficiency is improved and noise is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The sealing lips are designed as flexible elements that can deform to accommodate manufacturing tolerances and surface irregularities. This flexibility compensates for variations in manufacturing precision while maintaining effective sealing, thereby reducing noise without requiring extremely tight manufacturing controls.
Solution Approach 2:
The sealing lip geometry and material properties are optimized to provide effective sealing within reasonable manufacturing tolerance ranges. By adjusting parameters such as lip cross-section, material hardness, and contact pressure, the design achieves noise reduction without demanding excessive manufacturing precision.
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 effectively prevents foaming and reduces noise by maintaining a fluid-tight separation of oil and gas, ensuring reliable operation and lower system pressure, while allowing for cost-effective manufacturing and improved sealing efficiency.
Implementation Method 1
at least one separating element, which is capable of axial displacement and separates the damper oil from the damper gas in a fluid-tight manner, being arranged in the compensation chamber
Implementation Method 2
using sealing lips and compression chambers for enhanced sealing
Data Source
AI summary
A vibration damper may include an external tube and at least one internal tube. The external and internal tubes may be disposed in a coaxial manner relative to one another. An annular gap may exist between the external tube and the internal tube, and the annular gap may be fluidically connected to the internal tube. The annular gap may form a compensation chamber for receiving damper oil and damper gas for preloading of the damper oil in the compensation chamber. The vibration damper may further include a separating element disposed in the compensation chamber. The separating element may be axially displaceable and may separate the damper oil from the damper gas in a fluid-tight manner.