Vehicle Vibration Damper Calming Element for Hydraulic Foaming
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Solution Overview
Problem
Multi-tube vibration dampers experience foaming of hydraulic fluid due to unseparated gas and oil, leading to reduced damping performance and functionality.
Innovation Solution
A vibration damper design featuring a coaxial arrangement of outer and inner tubes with a compensation chamber, a calming element of higher density than the hydraulic fluid, and a central tube with constrictions and expansions to prevent foaming by allowing axial movement and creating flow resistance that manages fluid flow directionally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a helical element is used to calm the hydraulic oil, then the hydraulic oil level fluctuations are reduced, but the assembly of the helical element within the vibration damper becomes problematic
Solution Approach 1:
The calming element is extracted from the complex helical shape and replaced with a simple cylindrical body. This extraction simplifies the assembly process while maintaining the core function of calming hydraulic oil fluctuations through the cylindrical element's ability to resist fluid flow changes.
Solution Approach 2:
The invention changes the geometric parameters of the calming element from a helical structure to a cylindrical structure with specific diameter and length ratios. The cylindrical body with diameter D and length L (where L/D is between 0.5 and 2.0) provides the necessary flow resistance with simpler assembly requirements.
2Ease of manufacture
If the calming element is fixed in position, then the assembly is simplified, but the vibration damper cannot adapt to different operating conditions
Solution Approach 1:
The calming element is designed to move dynamically within the compensation chamber rather than being fixed. The cylindrical body can axially displace based on hydraulic pressure changes and vibration conditions, allowing the system to adapt to different operating conditions while maintaining simple assembly through the movable design.
3Device complexity
If gas and hydraulic oil are not hermetically separated, then the structure is simpler, but foaming occurs and damping performance is reduced
Solution Approach 1:
The calming element acts as an intermediary between the gas chamber and hydraulic oil. This cylindrical element with flow-resistant surfaces prevents direct mixing of gas and oil by creating a physical barrier and flow resistance, maintaining damping performance without requiring complex hermetic separation structures.
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
Prevents foaming of hydraulic fluid, ensuring consistent damping performance by allowing the calming element to move and manage fluid flow effectively, thereby maintaining the vibration damper's functionality.
Implementation Method 1
a calming element which is fitted so as to be able to be moved in an axial direction inside the compensation chamber
Implementation Method 2
a calming element of higher density than the hydraulic fluid
Data Source
AI summary
The disclosure relates to a vibration damper for a vehicle, comprising an outer tube and an inner tube which is arranged coaxially relative thereto, wherein between the outer tube and the inner tube a compensation chamber for receiving hydraulic fluid is formed, and a working piston which is connected to a piston rod and which is arranged so as to be able to be moved back and forth within the inner tube, wherein the inner space of the inner tube is divided by the working piston into a first working chamber and a second working chamber, wherein in the compensation chamber there is arranged a calming element which is fitted so as to be able to be moved in an axial direction inside the compensation chamber.