Constricting Drum Brake Shield Elements Heat Dissipation

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Solution Overview

Problem

Constricting drum brake assemblies generate heat during braking, which needs to be efficiently dissipated to prolong the life of the drum and surrounding components.

Innovation Solution

An annular array of replaceable shield elements made from metal matrix composite material is disposed on the outer surface of the drum, enhancing thermal conductivity and wear resistance, allowing for heat dissipation and reducing surface temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the drum is used in a constricting drum brake assembly for braking action, then braking function is achieved, but heat is generated during braking action which increases surface temperature and reduces component life

Engineering Contradiction:

Improvecomponent lifeVSAvoiddrum surface temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The drum surface is segmented by dividing it into multiple discrete heat dissipation fins rather than a uniform surface. This segmentation increases the surface area for heat transfer and creates channels for heat dissipation, effectively reducing the drum surface temperature while maintaining braking reliability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention adds a dimensional element by protruding heat dissipation fins outward from the drum surface. This transforms the two-dimensional drum surface into a three-dimensional structure with extended surfaces, significantly increasing the heat dissipation area and improving thermal management without compromising the braking function

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Force

If friction elements are engaged against the drum for braking action, then braking force is generated, but wear occurs on the drum surface reducing its lifespan

Engineering Contradiction:

Improvebraking forceVSAvoiddrum lifespan

Core Design Contradiction:

ForceVSDuration of action of stationary object

Solution Approach 1:

The heat dissipation fins are strategically positioned and structured to provide localized protection against wear. The fins create a more complex surface geometry that distributes wear more evenly and reduces concentrated stress points, thereby extending drum lifespan while maintaining effective braking force

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The drum is constructed using composite materials that combine high strength properties for withstanding braking forces with wear-resistant characteristics. This composite structure allows the drum to maintain structural integrity and resist wear over extended periods of operation

Inventive Principle:

Principle #40Composite materials

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 effectively reduces the surface temperature of the drum and surrounding areas, extending the life of the components by efficiently dissipating heat and providing wear resistance through replaceable shield elements.

Implementation Method 1

An annular array of replaceable shield elements is disposed radially on the annular outer surface of the drum for reducing surface temperature and wear of the drum

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS9140323B2Drum and constricting drum assembly

Publication Date: 2015.09.22 DANFOSS AS

AI summary

A drum with replaceable shield elements for a constricting brake assembly and improved constricting drum brake assembly with replaceable shield elements for transferring heat from the brake and providing wear resistance for the drum.