Hopper Car Gate Inverted V Void Reduction

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Solution Overview

Problem

Hopper cars face limitations in maximizing volumetric capacity within established dimensional constraints while minimizing construction costs, as increasing discharge openings requires larger gates and results in significant void volumes that reduce cargo-carrying efficiency.

Innovation Solution

The design incorporates opposed sloping surfaces forming an inverted V structure between discharge openings, reducing void volume by optimizing the size and arrangement of openings and gates, allowing for a larger cargo-carrying capacity without increasing gate sizes significantly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the number of discharge openings is increased to effectively discharge bulk materials, then discharge efficiency is improved, but construction expenses increase

Engineering Contradiction:

Improvedischarge efficiencyVSAvoidconstruction expense

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The hopper bottom is divided into multiple discrete discharge openings spaced apart from each other, allowing bulk materials to be discharged through multiple points simultaneously. This segmentation enables effective discharge of cargo while using a manageable number of openings, avoiding the need for excessive gates and reducing construction costs.

Inventive Principle:

Principle #1Segmentation

2Productivity

If the lower portion of hopper walls are angled to discharge bulk materials, then discharge effectiveness is improved, but volumetric capacity is reduced due to void volume

Engineering Contradiction:

Improvedischarge effectivenessVSAvoidvolumetric capacity

Core Design Contradiction:

ProductivityVSVolume of stationary object

Solution Approach 1:

The hopper design incorporates angled lower walls that slope downward toward the discharge openings, creating a three-dimensional configuration that directs bulk materials toward the discharge points. This angular geometry in the vertical dimension ensures effective discharge while minimizing the horizontal footprint and reducing void volume, thereby maximizing volumetric capacity within dimensional constraints.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Productivity

If gate sizes are increased to accommodate larger discharge openings, then cargo discharge capability is improved, but construction expense increases

Engineering Contradiction:

Improvecargo discharge capabilityVSAvoidconstruction expense

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The discharge openings are strategically positioned and sized to match the specific discharge requirements at each location along the hopper bottom. Rather than using uniformly large gates, the design employs locally optimized opening sizes that are sufficient for effective discharge without being excessively large, thereby reducing gate construction expenses while maintaining cargo discharge capability.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS7752979B2Hopper car gate with enlarged discharge and increased capacity

Publication Date: 2010.07.13 AERO TRANSPORTATION PRODUCTS INC

AI summary

A hopper car having an increased volume. The car has side walls, end walls, a bottom, and first and second sloping surfaces. The bottom lies at least partially in a horizontal plane and includes a plurality of spaced apart openings. The side walls, end walls, and horizontal plane define a volume X. The first and second sloping surfaces are located between adjacent openings and joined to the bottom adjacent the openings. The sloping surfaces extend upwardly from the bottom to present an inverted V enclosing a volume Y. The volume Y is no more than approximately 1 to 5% of the volume X.