Double Bellows Transition Protection for Rail Vehicles

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Solution Overview

Problem

Existing transition protection systems for articulated rail vehicle bodies lack effective fire protection while being cost- and weight-optimized, and are sensitive to external influences.

Innovation Solution

A double bellows system with an inner shell made of silicone material for enhanced fire protection and an outer shell made of a different material, reducing production costs and weight, and improving durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If silicone material is used for the outer shell, then fire protection is improved, but production costs and weight increase

Engineering Contradiction:

Improvefire protectionVSAvoidproduction costs

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies different materials to different parts of the bellows system: silicone material is used specifically for the inner shell where fire protection is critical (passenger area), while the outer shell uses a different material. This local differentiation optimizes fire protection where needed without unnecessarily increasing costs and weight throughout the entire structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs a composite material strategy by combining silicone material for the inner shell with a different material for the outer shell. This composite approach allows the system to achieve high fire protection standards in the critical inner region while using more cost-effective and lighter materials for the outer protective layer.

Inventive Principle:

Principle #40Composite materials

2Reliability

If silicone material is used for the outer shell, then fire protection is improved, but weight increases

Engineering Contradiction:

Improvefire protectionVSAvoidweight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

Silicone material is applied locally only to the inner shell where fire protection is essential for passenger safety, rather than throughout the entire bellows structure. This localized application minimizes weight increase while maintaining critical fire protection capabilities.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses a composite material construction with silicone for the inner shell and a different, likely lighter material for the outer shell. This composite strategy achieves the necessary fire protection while optimizing the overall weight of the transition protection system.

Inventive Principle:

Principle #40Composite materials

3Reliability

If silicone material is used for the inner shell, then fire protection is improved, but sensitivity to ultraviolet radiation increases

Engineering Contradiction:

Improvefire protectionVSAvoidsensitivity to ultraviolet radiation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The outer shell acts as an intermediary protective layer between the ultraviolet radiation and the silicone inner shell. This outer layer shields the silicone material from direct UV exposure, reducing degradation while maintaining the fire protection benefits of the silicone material in the critical inner region.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent recognizes that UV sensitivity is primarily a concern for the outer surface exposed to environmental factors, while the inner shell's primary function is fire protection. By using different materials optimized for their specific functions and exposure conditions, the system addresses both concerns effectively.

Inventive Principle:

Principle #3Local quality

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 solution provides high fire protection with reduced manufacturing costs and increased service life, while minimizing weight and sensitivity to external factors.

Implementation Method 1

They lead to a good insulation of the transition against sound, the effect of heat or heat loss

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

They also have good inherent stability without significantly impeding the necessary relative movements between two rail vehicle car bodies that are articulated to one another

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentEP2942214B1Protection for the transition between rail vehicle wagons connected with an articulated connection

Publication Date: 2023.06.21 ALSTOM HOLDINGS SA

Figure 1

AI summary

The invention relates to a transition protection (5) for articulated rail vehicle car bodies (1), comprising a double bellows (6, 7) forming an inner (7) and an outer (6) shell for the transition (4), wherein the outer shell (6) is formed from at least one first material. The inner shell (7) is formed using a second material that differs from the first material or materials, and the second material is a silicone material.