Floating Disc Brake Rotor Cutouts for Heat Distribution

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing floating type disc brakes face issues with heat deformation and deterioration due to thermal expansion, and struggle to balance strength and weight reduction, particularly with insufficient heat dissipation and torsional load resistance.

Innovation Solution

The design incorporates cutout portions on the rotor and projections to reduce heat transfer area, symmetrically formed cutouts to minimize temperature irregularity, and strategically positioned through apertures to enhance strength and heat distribution, along with straight beam-like portions on the hub for distributed load reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If heat transferring members are arranged between the projections of the braking rotor and the hub to transfer heat, then heat dissipation is improved, but temperature irregularity increases causing heat deformation and deterioration

Engineering Contradiction:

Improveheat dissipationVSAvoidheat deformation and deterioration

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent removes heat transferring members from the boundary region between the rotor portion and projections. By extracting these heat transfer paths at critical locations, the invention prevents localized heat concentration that would cause temperature irregularity and subsequent heat deformation or deterioration of the rotor portion.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies different heat transfer characteristics to different regions of the braking rotor. Heat transferring members are selectively positioned in regions where they provide beneficial heat dissipation without causing excessive temperature irregularity, while the boundary region between the rotor portion and projections is specifically designed to limit heat transfer and prevent localized thermal stress.

Inventive Principle:

Principle #3Local quality

2Weight of moving object

If the number of pins or arms of the hub is reduced to reduce weight, then weight is reduced, but heat dissipation capability decreases and temperature irregularity increases

Engineering Contradiction:

Improveweight of disc brakeVSAvoidtemperature irregularity

Core Design Contradiction:

Weight of moving objectVSTemperature

Solution Approach 1:

The patent optimizes the distribution of pins or arms by concentrating heat transferring members at specific strategic locations rather than uniformly distributing them. This allows weight reduction through fewer pins or arms while maintaining effective heat dissipation at critical regions where it is most needed, preventing temperature irregularity despite the reduced number of heat transfer paths.

Inventive Principle:

Principle #3Local quality

3Strength

If the thickness of beam-like portion is increased to provide sufficient strength against torsional load, then strength is improved, but weight increases

Engineering Contradiction:

Improvestrength against torsional loadVSAvoidweight of hub

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The patent strategically positions beam-like portions at specific locations on the hub where they provide maximum torsional resistance. By concentrating structural reinforcement at critical stress points rather than uniformly thickening the entire hub, the invention achieves sufficient strength against torsional loads while minimizing weight increase.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs curved or arc-shaped beam-like portions instead of straight rigid elements. This curvature provides enhanced torsional resistance through geometric efficiency while using less material, thereby maintaining strength requirements while reducing weight compared to straight beam configurations.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 effectively reduces heat deformation, maintains sufficient strength, and achieves weight reduction while ensuring consistent heat distribution and improved braking performance.

Implementation Method 1

heat dissipation per unit time from the rotor portion to the projections can be suppressed by the provision of the cutout portions

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 2

heat generated in the rotor portion during braking operations can be transferred to the hub via the connecting means

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Data Source

PatentUS7762379B2Floating type disk brake

Publication Date: 2010.07.27 YUTAKA GIKEN CO LTD

AI summary

A floating type disc brake “A” used for a vehicle such as a motorcycle comprising a braking rotor 1A and a hub 2A arranged inside the braking rotor 1A, the braking rotor 1A including an annular rotor portion 11 and a plurality of projections 13A extending radially inward from the inner circumferential portion of the rotor portion 11, and further comprising a connecting means 3 for connecting the braking rotor 1A and the hub 2A at positions in which the projections 13A of the braking rotor 1A are abutted to the outer circumferential portion of the hub 2A. At least one of the rotor portion 11 and the projections 13A is formed with cutout portions 13b at the boundary region between the rotor portion 11 and the projections 13A. It is possible to suppress a local heat dissipation in regions of the rotor portion 11 in which the projections 13A are formed and thus to reduce irregularity of heat distribution in the rotor portion 11 during braking operations.