Layered Aircraft Cargo Guide Roller for Impact and Abrasion Resistance

Solution Overview

Problem

Modern cargo handling systems face issues with guide rollers in aircraft cargo doorways experiencing irregular wear, tear, cutting, and chipping due to random impact loads from ULDs, leading to reduced durability and failure.

Innovation Solution

A guide roller design incorporating a layered structure of hydrogenated nitrile rubber (HNBR) and carboxylated nitrile rubber (XNBR) polymer matrix materials compounded with graphene, along with additional rubber compounds and mandrel/roller designs, enhancing abrasion and chip resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of stationary object

If traditional guide roller materials are used, then the initial cost is lower, but the durability and service life are reduced due to irregular wear, tear, cutting, and chipping from impact loads

Engineering Contradiction:

Improveservice lifeVSAvoidimpact damage

Core Design Contradiction:

Duration of action of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The guide roller employs a composite material structure consisting of a thermoplastic elastomer matrix combined with graphene filler. This composite provides enhanced mechanical properties including improved resistance to cutting, chipping, and wear while maintaining the necessary flexibility and impact absorption capabilities. The graphene reinforcement significantly increases the material's toughness and durability under random impact loads from ULDs.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes parameter changes by incorporating specific amounts of graphene (2-18 parts per hundred rubber) into the thermoplastic elastomer matrix. This compositional parameter change transforms the material properties, providing enhanced abrasion resistance, cut resistance, and chip resistance while maintaining the required elasticity and shock absorption for cargo doorway applications.

Inventive Principle:

Principle #35Parameter changes

2Strength

If conventional rubber compounds are used, then the manufacturing process is simpler, but the resistance to abrasion and chipping is insufficient under random loading patterns

Engineering Contradiction:

Improveabrasion resistanceVSAvoidmaterial composition

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The guide roller employs a composite material structure consisting of a thermoplastic elastomer matrix combined with graphene filler. This composite provides enhanced mechanical properties including improved resistance to cutting, chipping, and wear while maintaining the necessary flexibility and impact absorption capabilities. The graphene reinforcement significantly increases the material's toughness and durability under random impact loads from ULDs.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent utilizes parameter changes by incorporating specific amounts of graphene (2-18 parts per hundred rubber) into the thermoplastic elastomer matrix. This compositional parameter change transforms the material properties, providing enhanced abrasion resistance, cut resistance, and chip resistance while maintaining the required elasticity and shock absorption for cargo doorway applications.

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 improved guide roller exhibits increased durability, reliability, and extended service life by providing enhanced resistance to abrasion and chipping, ensuring consistent performance under impact loads.

Implementation Method 1

The rubber wrapping compound includes graphene as a reinforcing filler, wherein the graphene has a particle size (platelet) of between 4 micrometers and 16 micrometers

Methodology Applied

Scientific EffectGraphene reinforcement: Graphene

Data Source

PatentEP4497681B1Guide roller with enhanced chip, cut, and abrasion resistance for cargo doorway entrance

Publication Date: 2026.04.15 GOODRICH CORP

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Figure 1B
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AI summary

A guide roller for a cargo doorway of an aircraft is provided. The guide roller includes a mandrel (400), a first layer of a second rubber wrapping compound (406) disposed circumferentially around the mandrel, at least one first layer of a first rubber wrapping compound (408) disposed circumferentially around the first layer of the second rubber wrapping compound, a second layer of the second rubber wrapping compound (414) disposed circumferentially around the at least one first layer of the first rubber wrapping compound, at least one second layer of the first rubber wrapping compound (416) disposed circumferentially around the second layer of the second rubber wrapping compound, and at least one third layer of the second rubber wrapping compound (422) disposed circumferentially around the at least one second layer of the first rubber wrapping compound.