Rail Draftgear Coupling Leaf Spring Hooking Mechanism
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Solution Overview
Problem
Existing mechanical couplings in rail vehicles are prone to malfunction due to impairment from penetration particles, moisture, and corrosion, which affect the piston's motion and hinder the hooking up of the coupling.
Innovation Solution
A mechanical coupling design utilizing a leaf spring to bias the hooking rod against the collar, eliminating the need for a piston and reducing friction through a radiused free end and wear protection, ensuring reliable engagement and disengagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a piston is used to bias the hooking rod against the collar, then the hooking mechanism can be actuated, but the piston is susceptible to impairment from penetration particles, moisture, and corrosion which prevents its motion
Solution Approach 1:
The patent removes the piston component from the hooking mechanism entirely. Instead of using a piston that is susceptible to environmental damage, the invention employs a direct spring-loaded rod assembly that eliminates the intermediate piston element, thereby removing the vulnerability to penetration particles, moisture, and corrosion that would impair piston motion.
Solution Approach 2:
The patent replaces the complex piston-based mechanical system with a simpler direct-acting spring-loaded rod mechanism. This substitution eliminates the need for sealed chambers, piston rings, and complex sealing arrangements that are vulnerable to environmental factors, while maintaining the necessary biasing function through a more robust and maintenance-free mechanical design.
2Reliability
If a piston with sealing components is used, then the hooking rod can be biased reliably, but the complexity of the device increases due to additional components and sealing requirements
Solution Approach 1:
The patent extracts and removes all sealing components and intermediate mechanical elements from the biasing mechanism. By eliminating the piston and its associated seals, gaskets, and sealing chambers, the invention achieves reliable biasing through a straightforward spring-loaded rod design that requires no sealing arrangements.
Solution Approach 2:
Instead of using a sealed chamber with a piston that requires complex sealing to contain pressure, the patent inverts the approach by using an open, direct-acting spring mechanism. The biasing force is applied directly through the rod without requiring enclosed spaces or sealing interfaces, thereby simplifying the overall device structure while maintaining reliability.
3Force
If a piston-based biasing mechanism is used, then the hooking rod can be pressed against the collar, but the weight of the coupling mechanism increases
Solution Approach 1:
The patent removes the heavy piston component and its associated sealing infrastructure from the coupling mechanism. By eliminating these unnecessary mass-contributing elements and using a direct spring-loaded rod, the invention maintains the required biasing force while significantly reducing the overall weight of the moving parts in the coupling mechanism.
Solution Approach 2:
Instead of using a pressure-based piston system that requires heavy construction to contain and transmit force, the patent inverts to a direct mechanical spring system. This approach achieves the same biasing force transmission more efficiently with lighter components, as the spring directly applies force through the rod without requiring heavy sealing chambers or pressure containment 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
This design provides a reliable, simplified, and space-efficient coupling mechanism with reduced weight and improved economy by ensuring consistent hooking and disengagement without the risks of piston failure.
Implementation Method 1
a leaf spring (13) being in abutment against the hooking rod (12) forces the same, under the bias from the spring, to be pressed against the collar (11)
Data Source
Figure 1~4
Figure 2~3
Figure 5A~5B
AI summary
A mechanical coupling is disclosed, particularly a mechanical coupling in a draftgear in rail vehicles, comprising a central plate (5) turnably mounted in a coupler head and having a link (7) pivoted in the same, and including a hooking mechanism for detachable hooking up of the central plate and the link in the non coupled position of the coupling, as well as including a releasing device (10) for the automatic detachment of the hooking mechanism upon coupling, wherein the hooking mechanism comprises a hooking rod (12) pivotally connected with the central plate, which rod, by a lug (16), clutches a collar (11) arranged in the coupler head and, upon activation of the releasing device, is detached from said collar. A leaf spring (13) is arranged in the coupler head in order to, in abutment against the hooking rod (12), force the same, under the bias from the spring, to be pressed against the collar (11) in the hooked up as well as the disengaged position.