Integral Yoke Draft Gear Housing for Railway Car Cushioning
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Solution Overview
Problem
Conventional draft gears in railway cars are inadequate in dissipating forces during impacts, and hydraulic cushioning units are prone to leakage and provide minimal cushioning, necessitating a more effective energy absorption solution that can fit various sill configurations without reconfiguration.
Innovation Solution
A selective cushioning apparatus featuring a yoke with an open nose, a transverse tail wall, and a stack of elastomeric units positioned behind the tail wall, which can accommodate different sill dimensions and configurations, including those designed for hydraulic units, with a separate draft gear or buff gear to absorb forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional draft gear is used, then the structure is simple and easy to manufacture, but it transmits unacceptably large forces to the railway car during impact
Solution Approach 1:
The cushioning system is divided into multiple independent elastomeric units stacked together, each unit contributing to the overall energy absorption. This segmentation allows the system to dissipate larger forces through cumulative deformation of multiple elements rather than relying on a single complex mechanism.
Solution Approach 2:
The invention uses composite elastomeric units combining rubber-like material with internal metal structures (such as convoluted elements or springs). This composite construction provides both the flexibility needed for energy absorption and the structural integrity to handle impact forces, achieving superior force dissipation compared to conventional draft gear.
2Force
If a hydraulic cushioning unit is used, then more energy can be dissipated, but the unit is prone to leakage and provides minimal cushioning of draft forces
Solution Approach 1:
The invention replaces the hydraulic system (which uses fluid pressure and is prone to leakage) with a purely mechanical elastomeric system. The elastomeric units deform under load to absorb energy, providing reliable force dissipation without the leakage issues inherent in hydraulic systems.
Solution Approach 2:
The elastomeric material properties can be adjusted by changing parameters such as durometer hardness, stack height, and internal structure configuration. This allows optimization of both energy dissipation capability and draft force cushioning without compromising reliability, as the solid elastomeric material does not suffer from fluid leakage problems.
3Force
If a selective cushioning apparatus with stack of elastomeric units is used, then enhanced energy absorption is achieved, but the apparatus must be adapted to fit various pre-existing sill configurations
Solution Approach 1:
The yoke design incorporates universal features that allow it to function in multiple sill configurations. The transverse tail wall and longitudinal dimension can be adjusted to accommodate different pocket depths, while the overall yoke structure maintains compatibility with both conventional draft gear installations and new selective cushioning apparatus requirements.
Solution Approach 2:
The invention addresses fitment issues by adjusting dimensional parameters of the yoke in multiple dimensions. The longitudinal dimension of the yoke is specifically designed to accommodate the stack of elastomeric units while maintaining compatibility with existing sill pocket configurations. The transverse tail wall dimensions are also adjusted to fit between intermediate lugs in various sill designs, providing adaptability across different railway car configurations.
4Length of moving object
If the yoke is shortened to accommodate elastomeric units behind it, then space efficiency is improved, but the precision of fitting into specific sill pockets becomes more critical
Solution Approach 1:
The yoke is designed with specific dimensional parameters optimized for the shortened configuration. The longitudinal dimension is reduced to accommodate the elastomeric units, while the transverse tail wall dimensions are precisely configured to fit between intermediate lugs. These parameter changes require precise manufacturing to ensure proper fitment into the sill pockets.
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 apparatus effectively dissipates forces across a range of sill configurations, providing enhanced energy absorption and flexibility in installation, while eliminating the need for reconfiguration, and offering adjustable travel limits to manage buff and draft forces efficiently.
Implementation Method 1
a stack of elastomeric units positioned behind the transverse tail wall of the yoke, each elastomeric unit comprising at least one elastomeric pad on a metal plate
Data Source
AI summary
A cushioning apparatus for a railway car employs a shortened yoke having a draft gear housing integral with the yoke. A stack elastomeric pads is provided in the housing, and a second stack of elastomeric pads and corresponding rigid metal plates, is positioned in the sill behind the modified yoke to absorb buff loads on the coupler. In embodiments, the entire assembly may be placed in a sill having forward stops, intermediate stops, and rear stops.