Rotatable Brake Shoe Drum Brake for Lower Rotational Inertia

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Solution Overview

Problem

Drum brakes contribute significantly to the energy consumption of motor vehicles due to the weight and moment of inertia of the brake drum, which affects pedal feel and brake performance.

Innovation Solution

A drum brake assembly where the brake drum is non-rotatable and the brake shoes are coupled to a rotatable axle component, reducing the impact of the drum brake on energy consumption by minimizing the moment of inertia and requiring less brake energy for braking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the brake drum is made heavy and rotatable to provide sufficient braking force, then the braking performance is improved, but the energy consumption increases due to higher moment of inertia

Engineering Contradiction:

Improvebraking performanceVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The brake system is segmented into a non-rotatable brake drum housing and rotatable brake shoe assemblies. The brake drum remains stationary while the brake shoes rotate with the axle, separating the functions of structural support and rotational motion to reduce moment of inertia.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of the conventional design where the brake drum rotates and brake shoes are stationary, this invention inverts the arrangement: the brake drum is fixed and non-rotatable, while the brake shoes are made rotatable to follow the axle rotation, thereby reducing the rotating mass.

Inventive Principle:

Principle #13The other way round (Inversion)

2Reliability

If the brake drum is made heavy to provide sufficient braking force, then the braking performance is improved, but the vehicle weight increases affecting overall energy consumption

Engineering Contradiction:

Improvebraking performanceVSAvoidvehicle weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The brake system is divided into a stationary brake drum housing and separate rotatable brake shoe assemblies. This segmentation allows the brake drum to be optimized for structural strength without rotating mass, while the brake shoes are minimized for rotational function only.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conventional arrangement is inverted by making the brake drum non-rotatable and the brake shoes rotatable. This inversion reduces the effective rotating mass from the heavy brake drum to the lighter brake shoes, reducing overall vehicle weight.

Inventive Principle:

Principle #13The other way round (Inversion)

3Device complexity

If the brake drum rotates jointly with the axle component, then the braking system is simpler to implement, but the moment of inertia increases affecting acceleration energy consumption

Engineering Contradiction:

Improvebrake system implementationVSAvoidacceleration energy consumption

Core Design Contradiction:

Device complexityVSUse of energy by moving object

Solution Approach 1:

The brake system is segmented into a stationary brake drum housing and rotatable brake shoe assemblies coupled to the axle. This segmentation reduces the rotating mass to only the brake shoes, significantly lowering the moment of inertia while maintaining functional simplicity through standardized coupling mechanisms.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conventional design is inverted by making the brake drum stationary and the brake shoes rotatable. This inversion reduces the moment of inertia from the heavy rotating brake drum to the lighter rotating brake shoes, directly reducing acceleration energy consumption.

Inventive Principle:

Principle #13The other way round (Inversion)

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 configuration reduces energy consumption and wear of friction material, limits thermal expansion, and improves brake performance by minimizing the rotational mass of the brake drum.

Implementation Method 1

each of the brake shoe assembly and brake drum has a contact portion for contacting the respective other of the brake shoe assembly and brake drum to generate a braking force

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS12583421B2Drum brake with rotatable brake shoe assembly

Publication Date: 2026.03.24 HL MANDO CORP

AI summary

The invention relates to a drum brake assembly for braking a wheel a motor vehicle that rotates about a rotation axis,with:a brake drum having a back wall section extending at an angle to the rotation axis and a circumferential wall section,at least one brake shoe assembly,wherein each of the brake shoe assembly and brake drum has a contact portion for contacting the respective other of the brake shoe assembly and brake drum to generate a braking force; andwherein the brake shoe assembly is configured to be coupled to a rotatable axle component of the motor vehicle to rotate relative to the brake drum about the rotation axis.