Fluidic Coupling With Capillary Compensation for Stable Chassis Stiffness
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Solution Overview
Problem
Existing fluidic coupling devices for mechanical engineering applications, such as wheel or wheelset guidance systems in rail vehicles, suffer from high complexity and are susceptible to temperature influences that affect fluid pressure and coupling stiffness, leading to decreased service life.
Innovation Solution
A fluidic coupling device with a control body and a capillary section in the second fluid line, allowing fluid to flow between chambers based on temperature, maintaining stable fluid pressure and reducing the need for additional lines and control elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple fluid lines and fluidic control elements are used to couple the compensation chamber, then the fluid pressure can be controlled, but the device complexity increases
Solution Approach 1:
The patent combines multiple fluid lines into a single fluid line that connects the compensation chamber to both fluid chambers. This single line incorporates a capillary section that integrates the functions of multiple separate lines, thereby reducing device complexity while maintaining fluid pressure control capability.
Solution Approach 2:
The capillary section acts as an intermediary element within the single fluid line, providing temperature-compensated fluid flow control. It mediates between the compensation chamber and the fluid chambers, enabling pressure regulation without requiring multiple separate control lines or additional control elements.
2Stability of the object's composition
If fluid pressure is increased to maintain coupling stiffness at high temperatures, then running stability improves, but the risk of excessive pressure increase and device failure rises
Solution Approach 1:
The compensation chamber is pre-filled with a specific amount of fluid that creates a feedback mechanism. When temperature increases cause pressure to rise in the fluid chambers, the excess pressure automatically flows into the compensation chamber through the capillary section, thereby stabilizing the pressure and preventing excessive pressure increase that could lead to device failure.
Solution Approach 2:
The compensation chamber is pre-filled with fluid before operation, creating a buffer or cushion against temperature-induced pressure increases. This pre-prepared compensation fluid absorbs excess pressure before it can reach dangerous levels, thereby protecting the device from failure while maintaining coupling stiffness.
3Object-generated harmful factors
If fluid pressure is decreased to reduce coupling stiffness at low temperatures, then wear and noise are reduced, but the risk of fluid pressure drops and stiffness decrease increases
Solution Approach 1:
The capillary section provides a feedback mechanism that automatically responds to temperature-induced pressure drops. When pressure decreases at low temperatures, the compensation chamber's pre-filled fluid flows back into the fluid chambers through the capillary section, maintaining sufficient pressure to prevent stiffness loss and ensuring reliable operation.
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 device maintains fluid pressure within specified tolerances despite temperature variations, ensuring consistent coupling stiffness and extended service life by preventing excessive pressure drops or increases, thus enhancing running stability and reducing wear.
Implementation Method 1
the second fluid line is arranged as the sole fluid line for conveying fluid into and out of the third fluid chamber and has a smaller cross-section than the first fluid line, at least in one capillary section
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a fluidic coupling device for coupling components, in particular for a chassis of a rail vehicle, comprising a variable-size first fluid chamber (5), a variable-size second fluid chamber (6), and a first fluid line (10) connecting the first fluid chamber (5) to the second fluid chamber (6), wherein the first fluid chamber (5) and the second fluid chamber (6) can be supplied with fluid (12) to adjust the coupling stiffness of the coupling device. It is proposed that a third fluid chamber (7) be connected to the first fluid line (10) via a second fluid line (11), wherein the second fluid line (11) is the sole fluid line for conveying fluid (12) into and out of the third fluid chamber (7) and has a smaller cross-section than the first fluid line (10) at least in a capillary section (13).This reduces the influence of temperature on the coupling stiffness of the coupling device.