Rail Coupling Head Air Line Layout for Lower Pressure Loss

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Solution Overview

Problem

Existing coupling heads for rail vehicles experience high flow resistance and pressure loss in the air line due to right-angled bends, leading to inefficient compressed air distribution and potential brake failure in case of component failure.

Innovation Solution

The air line is designed without right-angle bends, featuring straight and slightly curved sections, with a plunger and eccentric arrangement to minimize pressure loss, and includes a locking device to prevent brake failure and a cover that automatically adjusts during coupling and uncoupling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the air line is designed with right-angled bends to simplify the coupling head structure, then the device complexity is reduced, but the flow resistance and pressure loss increase

Engineering Contradiction:

Improvestructure simplicityVSAvoidpressure loss

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The air line is designed with curved sections instead of right-angled bends. The patent specifies that the air line includes a first section, a second section, and a third section arranged in sequence, where the second section is curved to connect the first and third sections, eliminating sharp angular transitions and reducing flow resistance.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Loss of energy

If the air line has larger inner diameters exceeding 30 mm to reduce flow resistance, then the pressure loss decreases, but the coupling head size and weight increase

Engineering Contradiction:

Improvepressure lossVSAvoidcoupling head weight

Core Design Contradiction:

Loss of energyVSWeight of moving object

Solution Approach 1:

The patent specifies an optimized inner diameter range for the air line of 30-50 mm, balancing flow resistance reduction with acceptable size and weight constraints. This parameter optimization allows sufficient air flow for brake systems while maintaining reasonable coupling head dimensions.

Inventive Principle:

Principle #35Parameter changes

3Loss of energy

If the air line is designed without kinks or right-angle bends to reduce pressure loss, then the manufacturing complexity increases, but the flow efficiency improves

Engineering Contradiction:

Improvepressure dropVSAvoidmanufacturing complexity

Core Design Contradiction:

Loss of energyVSEase of manufacture

Solution Approach 1:

The air line incorporates smoothly curved sections with controlled radii that eliminate kinks and right-angle bends. The curved second section connects the first and third sections in a continuous, flow-friendly manner that reduces turbulence and pressure loss while remaining manufacturable using standard pipe bending techniques.

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Ease of manufacture

If the coupling head is designed with simplified structure for ease of manufacture, then the production cost decreases, but the reliability in case of component failure is reduced

Engineering Contradiction:

Improveproduction simplicityVSAvoidsafety against brake failure

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The air line is divided into multiple sections (first, second, and third sections) that can be manufactured separately and assembled. This segmentation allows for quality control and replacement of individual sections if needed, maintaining reliability while simplifying manufacturing of each component.

Inventive Principle:

Principle #1Segmentation

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 reduces pressure loss, ensuring faster braking and enhanced safety by maintaining air flow integrity and preventing brake failure, even in the event of component defects.

Implementation Method 1

the air line leading transversely to the impact surface on or in the clutch housing is formed without kinks or right-angle bends up to the rear of the clutch housing, with at least one approximately straight line section and/or slightly curved line sections

Methodology Applied

Scientific EffectPressure loss reduction through streamlined geometry:

Implementation Method 2

a valve element with a plunger and a movable adjusting element that opens and closes the air line. When closing, the plunger can be pressed against a stop by the adjusting element; when opening, it can be moved back, thus opening the air line

Methodology Applied

Scientific EffectMechanical valve actuation:

Data Source

PatentEP4494969B1Coupling head for a coupling of a rail vehicle

Publication Date: 2026.03.25 FAIVELEY TRANSPORT SCHWAB AG

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AI summary

A coupling head (10) for a coupling of a rail vehicle is provided with a coupling housing (15) forming a contact surface (11) at its front, at least one air coupling (20) with an air line (25) leading from the contact surface (11) to the rear (15') of the coupling housing (15), and a valve element (30) opening and closing the latter. This valve element (30) is located at the rear of the coupling housing (15). It has a plunger (31) and a movable adjusting element that opens or closes the air line (25). The air line (25), which extends transversely to the contact surface (11) on the coupling housing (15), is formed without right-angle bends up to the rear (15') of the coupling housing (15), with at least one approximately straight line section (27) and slightly curved line sections (26, 28). With this training or arrangement of the air duct orWith the air coupling, less pressure drop is achieved in the couplings connected in series on the rail vehicles of trains at a given operating pressure of the main air line.