Train Coupler Energy Absorber for Peak Load Dissipation

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Solution Overview

Problem

Existing energy dissipation devices in train couplers and buffers face challenges in managing the propagation of shock waves during collisions, leading to inefficient energy absorption and potential damage due to peak loads and incomplete utilization of stroke lengths.

Innovation Solution

An energy dissipation device with axially compressible steel elements pre-tensioned between a compression means and a counter pressure means, allowing for a lightweight design with adjustable stroke length and compression strength, integrated into train couplers and buffers to control impact forces and distribute energy efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If traditional energy dissipation devices are used in train couplers, then shock wave management is attempted, but energy absorption efficiency is insufficient and peak loads cause damage

Engineering Contradiction:

Improveenergy absorption efficiencyVSAvoidpeak load damage

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The energy dissipation device is divided into multiple compression elements arranged in series, each capable of independent compression. This segmentation allows the device to absorb energy in progressive stages, reducing peak loads while maintaining high overall energy absorption efficiency. Each element acts as an independent energy absorption unit that activates sequentially during impact events.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs compression elements with variable compression strength characteristics, where the stiffness and energy absorption capacity of each element can be independently tuned. By adjusting parameters such as element length, cross-sectional area, and material properties, the device optimizes energy absorption across different impact scenarios, preventing both under-absorption and excessive peak loads.

Inventive Principle:

Principle #35Parameter changes

2Loss of energy

If heavier energy dissipation structures are used, then energy absorption capacity increases, but device weight increases

Engineering Contradiction:

Improveenergy absorption capacityVSAvoiddevice weight

Core Design Contradiction:

Loss of energyVSWeight of moving object

Solution Approach 1:

The patent achieves high energy absorption capacity with reduced weight by optimizing the geometric and material parameters of compression elements. Elements are designed with specific length-to-diameter ratios and wall thicknesses that maximize energy absorption per unit mass. The use of high-strength materials allows thinner walls and lighter construction while maintaining required absorption capacities.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

By dividing the total energy absorption requirement into multiple smaller compression elements, the device achieves the same total energy absorption capacity as a single large element but with reduced overall weight and improved structural efficiency. Each segment contributes proportionally to the total energy absorption while the distributed architecture reduces stress concentrations.

Inventive Principle:

Principle #1Segmentation

3Device complexity

If compression elements are not pre-tensioned, then device complexity is reduced, but stroke length utilization is incomplete

Engineering Contradiction:

Improvepre-tensioning mechanism complexityVSAvoidstroke length utilization

Core Design Contradiction:

Device complexityVSDuration of action of moving object

Solution Approach 1:

The compression elements are pre-tensioned during assembly to a predetermined force level that ensures optimal engagement during impact events. This preliminary action eliminates initial clearance and ensures that the full stroke length of each element is utilized from the moment of impact, maximizing energy absorption without requiring complex control mechanisms.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The pre-tensioning force is carefully calibrated as a specific parameter to achieve complete stroke utilization. By adjusting the pre-tensioning level, the device ensures that compression elements engage fully during normal operation while maintaining simplicity in the overall structure. The pre-tensioning parameter is set during design to match expected impact scenarios.

Inventive Principle:

Principle #35Parameter changes

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 device effectively absorbs kinetic energy by distributing impact forces, reducing peak loads, and maximizing stroke length utilization, minimizing damage to train components through a phased energy absorption process.

Implementation Method 1

at least one axially compressible, irreversibly deforming element of steel... The at least one compressible element is pre-tensioned axially between said retractable compression means and a counter pressure means

Methodology Applied

Scientific EffectPlastic deformation: Plasticity

Data Source

PatentUS12472998B2Energy dissipation device

Publication Date: 2025.11.18 RXD RES EXCHANGE DEV AB

AI summary

An energy dissipation device is shown in connection with its implementation in train couplers. The energy dissipation device comprises axially compressible, irreversibly deforming steel elements arranged in a housing and axially pre-tensioned between a compression means and a counter-pressure means. In case of an impact, the compression means is moving in sliding contact with the inside wall of the housing to provide axial compression of the energy absorbing elements while preserving the integrity of the housing.