Yoke-Mounted Coupler Support to Prevent Railway Coupler Droop
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Solution Overview
Problem
Railway car couplers experience droop due to gravity and normal usage, leading to alignment issues and potential damage from vertical forces on the draft key, which can cause costly repairs.
Innovation Solution
A yoke-mounted coupler support system is introduced, featuring a coupler support extending from the top wall of the yoke to prevent downward deflection, combined with elastomeric units or hydraulic units to absorb loads, and a modified center of gravity to reduce vertical forces on the draft key.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coupler is attached to the yoke with a draft key in an E-type yoke, then the coupler can be securely connected, but vertical forces on the draft key may cause the key to crack and deform leading to costly repairs
Solution Approach 1:
A coupler support block is introduced as an intermediary component between the coupler shank and the yoke interior surface. This support block bears the vertical loads that would otherwise be transmitted to the draft key, preventing the key from cracking and deforming while maintaining secure coupler connection
Solution Approach 2:
The vertical load-bearing function is extracted from the draft key and transferred to a dedicated coupler support block. This separation allows the draft key to focus on lateral retention while the support block handles vertical forces, improving overall system reliability
2Device complexity
If the coupler is allowed to deflect downward due to gravity and normal usage, then the structure remains simple, but excessive droop causes alignment problems when couplers of adjacent cars are connected
Solution Approach 1:
The coupler support block acts as a mediator that provides upward support to counteract gravitational droop. By positioning this support block at the appropriate location within the yoke, the coupler maintains proper alignment without requiring complex structural modifications to the yoke itself
3Object-affected harmful factors
If cushioning devices are installed to absorb loads on the coupler, then impact forces transmitted to the railway car are reduced, but the device complexity increases with draft gear, hydraulic units, and selective cushioning units
Solution Approach 1:
The cushioning function is segmented into separate components: the coupler support block handles vertical droop prevention, while elastomeric cushioning units handle impact absorption. This segmentation allows each component to be optimized for its specific function without requiring a complex integrated system
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 system effectively prevents coupler droop and reduces alignment issues, minimizing damage and repair costs by distributing forces more evenly across the yoke and coupler components.
Implementation Method 1
a stack of elastomeric units positioned between the coupler follower and the vertical rear wall of the yoke compressed in response to buff and draft loads on the coupler
Implementation Method 2
a hydraulic unit positioned behind the vertical rear wall of the yoke, comprising a piston received in a recess of the yoke behind the vertical rear wall of the yoke and a cylinder filled with a fluid and receiving the piston, wherein the fluid is adapted to dissipate forces when the piston moves in the cylinder in response to loads on the coupler
Data Source
AI summary
A yoke for a railway car is provided with a coupler support protruding from a top wall of the yoke into an interior space in the yoke to contact the coupler shank when the coupler head is deflected downward to prevent the coupler from drooping after prolonged use.