Brake Disc-Hub Connection with Angled Flanks

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Solution Overview

Problem

Existing brake disc-hub connections face challenges with thermal crack resistance and heat input during braking, leading to clamping issues and difficulty in servicing due to the wedge shape of teeth and direct heat transfer.

Innovation Solution

A brake disc-hub connection design where the lateral flanks of the drivers and supporting elements are oriented at an angle of 15° to 30°, primarily as normal forces, reducing the wedge effect and incorporating intermediate elements for thermal insulation and easy servicing, with non-rusting materials to prevent adhesion and facilitate mounting and dismantling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the teeth have a significant wedge shape to transmit braking torque, then the braking torque transmission is improved, but the brake disc is clamped which impedes thermal expansion and servicing

Engineering Contradiction:

Improvebraking torque transmissionVSAvoidservicing and dismantling

Core Design Contradiction:

PowerVSEase of operation

Solution Approach 1:

The connection interface is segmented into multiple drivers on the hub and supporting elements on the brake disc, arranged circumferentially. This segmentation allows the braking torque to be distributed across multiple contact points, reducing the clamping effect on any single element while maintaining overall torque transmission capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using a wedge shape that forces the brake disc against the hub (conventional approach), the invention inverts the approach by using drivers with laterally oriented flanks that engage the supporting elements in a manner that transmits torque through lateral contact rather than axial clamping. This inversion eliminates the clamping effect while maintaining torque transmission.

Inventive Principle:

Principle #13The other way round (Inversion)

2Ease of operation

If intermediate elements are provided between the teeth to simplify dismantling, then the ease of servicing is improved, but the heat input from direct heat transfer increases

Engineering Contradiction:

ImprovedismantlingVSAvoidheat input

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

Intermediate elements are introduced as thermal mediators between the brake disc and hub. These elements serve dual functions: they facilitate easy dismantling by providing a release mechanism and simultaneously reduce heat transfer from the brake disc to the hub, protecting the hub from thermal damage while maintaining servicing ease.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Power

If the lateral flanks are oriented radially to transmit normal forces, then the braking forces occur as purely normal forces improving torque transmission, but the wedge effect reduces thermal crack resistance

Engineering Contradiction:

Improvebraking torque transmissionVSAvoidthermal crack resistance

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The drivers are designed with different flank orientations for different functions: the lateral flanks are oriented radially to transmit braking forces as normal forces for efficient torque transmission, while the axial flanks provide a different orientation that reduces the wedge effect and allows thermal expansion, thereby improving thermal crack resistance through localized functional differentiation.

Inventive Principle:

Principle #3Local quality

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 design enhances thermal insulation, reduces heat input, improves servicing ease, and maintains high braking torque transmission while ensuring sufficient ventilation and rigidity, allowing for efficient operation and maintenance.

Implementation Method 1

incorporating intermediate elements for thermal insulation and easy servicing

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

If the brake disc is subjected to high temperatures it may lead to internal component stresses which allow the brake disc to shrink slightly in diameter

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS10066690B2Brake disc-hub connection

Publication Date: 2018.09.04 KNORR BREMSE SYSTEME FUER NUTZFAHIZEUGE GMBH

AI summary

A brake disc-hub connection is provided, wherein a hub has drivers, which extend from a wheel flange of the hub in the axial direction relative to a rotational axis common to a brake disc and the hub and engage in a toothed manner between supporting elements, which are arranged on the inner circumference of a brake disc and extend in the direction of the rotation axis. Lateral flanks of the drivers are oriented radially to the rotation axis and lateral flanks of the supporting elements are oriented parallel to the lateral flanks of the drivers. The lateral flanks of each of the drivers are oriented at an angle of 15° to 30° to each other.