Angled Pulling Lugs in Railway Car Coupler Knuckle

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Solution Overview

Problem

Existing railway car couplers face challenges in efficient repair and maintenance, particularly when a knuckle fails, as replacement parts must be carried along the length of a long train, leading to labor-intensive repairs and potential delays, especially in inclement weather.

Innovation Solution

The design incorporates angled pulling lugs and an increased distance between the pivot pin hole and pivot pin protector, along with a mating geometry between the lock and knuckle, to ensure even load distribution and prevent premature loading of the pivot pin, facilitating easier and more reliable coupling and decoupling of railcar couplers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional vertical pulling lugs are used, then the structure is simple, but load distribution is uneven and one set of lugs may be overloaded

Engineering Contradiction:

Improveload distributionVSAvoidlug geometry

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The pulling lugs are designed with an angled geometry rather than vertical alignment, creating an asymmetric structure that enables both top and bottom lugs to engage simultaneously with the knuckle, thereby distributing the load evenly across both lugs during coupling operations

Inventive Principle:

Principle #4Asymmetry

2Reliability

If the pivot pin hole is positioned close to the pivot pin protector, then the structure is compact, but the pivot pin may be loaded prematurely before the pulling lugs

Engineering Contradiction:

Improveengagement sequenceVSAvoiddistance between pivot pin hole and protector

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The pivot pin hole is positioned at a greater distance from the pivot pin protector to ensure that the pulling lugs engage and begin bearing load before the pivot pin becomes loaded. This spatial arrangement creates a predetermined engagement sequence where the lugs are loaded first, preventing premature pivot pin loading

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the lock and knuckle have standard mating geometry, then manufacturing is straightforward, but the lock may not move properly with the knuckle during engagement

Engineering Contradiction:

Improvelock movementVSAvoidmating geometry

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The mating geometry between the lock and knuckle is specifically designed with localized features that ensure proper relative movement. The geometry is tailored at the interface between these two components to enable the lock to move in place with the knuckle during coupling engagement, while other parts of the components maintain standard manufacturing practices

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS9707980B2Railway car coupler and knuckle system and method

Publication Date: 2017.07.18 MCCONWAY & TORLEY LLC

AI summary

A railway car coupler system includes a railcar coupler comprising a coupler head portion extending from a shank portion. The coupler head portion is configured to couple to a first coupler knuckle for coupling the railcar coupler to a second railcar coupler of an adjacent railcar. The coupler head portion comprises a coupler pivot pin hole for receiving a pivot pin for coupling the railcar coupler to the first coupler knuckle. The pivot pin hole has a longitudinal axis. The coupler head portion comprises top and bottom coupler pulling lugs each having a respective coupler pulling lug engagement face. At least one of the coupler pulling lug engagement faces of the top and bottom coupler pulling lugs is angled with respect to the longitudinal axis.