Rail Vehicle Air Coupling with Large Flow Cross Section
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Solution Overview
Problem
Automatic air couplings used in passenger rail vehicles are not robust enough for freight wagons, requiring high penetration speed and being susceptible to foreign objects, while those for freight wagons are complex and inefficient to operate.
Innovation Solution
An automatic air coupling design with a large free flow cross section, a valve system actuated by a cam and shaft connected to a coupling lock, and integrated position sensors to ensure reliable operation and protection from foreign objects, achieving a robust and easy-to-operate solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If automatic air couplings from passenger rail vehicles are used in freight wagons, then ease of operation is improved, but robustness deteriorates due to susceptibility to foreign objects and damage
Solution Approach 1:
The patent employs a robust housing structure that encloses and protects the cam mechanism and valve components from foreign objects such as bulk material. This protective enclosure allows the use of automatic air coupling operation while preventing damage from external contaminants, thus resolving the contradiction between ease of operation and robustness.
2Reliability
If simple pipe sections with end-face seals are used for freight wagons, then robustness is improved, but device complexity increases and operation becomes less efficient
Solution Approach 1:
The patent segments the air coupling system into distinct functional components: a robust housing for protection, a cam mechanism for valve actuation, and a valve body for flow control. This segmentation allows each component to be optimized independently - the housing provides robustness while the cam-valve mechanism provides efficient automated operation, resolving the contradiction between robustness and device complexity.
3Reliability
If a valve system with cam and shaft actuation is implemented, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the coupling lock mechanism with the valve actuation system through the shaft connection. The same shaft that controls the coupling lock also drives the cam that actuates the valve, eliminating the need for separate actuation mechanisms. This integration improves operational reliability by ensuring coordinated operation while reducing overall device complexity.
4Speed
If large free flow cross section is designed for main air line, then penetration speed is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the flow channel geometry by changing parameters such as cross-sectional area, curvature radius, and surface finish to minimize flow resistance and maximize penetration speed. These parameter optimizations achieve high airflow velocity while maintaining manufacturability through standard machining processes, resolving the contradiction between speed and ease of manufacture.
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 ensures reliable air coupling with high penetration speeds and protection from foreign objects, enhancing operational reliability and efficiency in freight wagon applications.
Implementation Method 1
The valve actuator comprises a shaft rotatable about an axis of rotation, which is designed for rotationally fixed connection to a railway vehicle coupling lock, in particular its main bolt... The at least one cam engages at least indirectly with the valve body for its actuation.
Implementation Method 2
releasing the valve, which is then closed by the force of a spring mechanism, blocking the flow channel
Data Source
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AI summary
The invention relates to an automatic air coupling for a rail vehicle, in particular in the form of a freight wagon, with a mouth piece for coupling the air coupling to a mating air coupling; with a compressed-air connection piece for connecting the air coupling to a rail vehicle compressed-air system; with a flow duct which connects the mouth piece in compressed-air-conducting fashion to the compressed-air connection piece; with a valve which is arranged in the flow duct and which has a valve body and a valve seat, wherein the valve body can be moved between an open position, in which it opens the flow duct at least substantially or completely, and a closed position, in which it shuts off the flow duct in a pressure-tight manner. The automatic air coupling according to the invention is characterized in that a free flow cross section for the compressed air through the mouth piece, the flow duct, the valve in the open position of the valve body, and the pressure connection piece has a minimum width of 20 mm.