Ventilated Brake Disc Boss Layout for Overheating Control
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Solution Overview
Problem
Braking devices experience overheating issues due to their small footprint, particularly in disc brakes with limited space, leading to localized overheating and potential ruptures.
Innovation Solution
The design incorporates inclined bosses and pins in the ventilation duct of the brake disc to enhance airflow, along with a driving bell connection that minimizes obstruction and promotes uniform airflow, ensuring effective heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the brake disc is designed with a small footprint to save space, then the vehicle wheel assembly becomes more compact, but the ventilation duct becomes too small to provide adequate cooling airflow
Solution Approach 1:
The invention introduces inclined bosses at specific locations within the ventilation duct to create localized airflow disturbance and enhancement zones. These bosses are strategically positioned to optimize cooling airflow distribution across the braking band without increasing the overall brake disc footprint, thereby resolving the contradiction between compact size and adequate cooling.
Solution Approach 2:
The inclined bosses add a third-dimensional element (axial inclination) to the otherwise radial ventilation duct structure. This dimensional change creates turbulence and enhances airflow penetration into the braking band, improving cooling efficiency within the constrained radial and axial dimensions of the small footprint brake disc.
2Strength
If pins are used to connect the two plates of the braking band, then the structural integrity is improved, but the pins obstruct the ventilation duct and create poor cooling airflow zones
Solution Approach 1:
The pins are positioned asymmetrically within the ventilation duct rather than centrally, and the inclined bosses are strategically located to channel airflow around the pin locations. This asymmetric arrangement maintains structural connectivity while minimizing airflow obstruction and preventing localized overheating zones around the pins.
3Adaptability or versatility
If the driving bell is elongated to accommodate a parking brake, then the parking brake function is enabled, but the elongated bell obstructs air entry into the ventilation duct and worsens overheating
Solution Approach 1:
The ventilation duct is segmented into multiple airflow pathways by the inclined bosses, creating separate channels that bypass the driving bell obstruction. This segmentation allows cooling airflow to reach different zones of the braking band independently, ensuring adequate cooling even with the elongated driving bell present for parking brake functionality.
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 significantly improves ventilation and heat exchange, reducing the tendency for overheating and preventing localized expansions, thus enhancing the brake disc's durability.
Implementation Method 1
a ventilation duct (7) delimited by said substantially flat opposite inner surfaces (8, 9) is provided between said plates (3, 4)... This configuration significantly improves ventilation and heat exchange, reducing the tendency for overheating
Data Source
AI summary
A braking device for a vehicle may have a braking band of a brake disc of a disc brake. Close to the inner band edge at least a first inclined boss protrudes towards the inside of the ventilation duct having a first boss direction forming a first acute angle with the radial direction. Close to the inner band edge at least a second inclined boss protrudes towards the inside of the ventilation duct without reaching the opposite inner surface having a second boss direction forming a second acute angle with the radial direction. The inclination of the second boss direction with respect to the radial direction is opposite to the inclination of the first boss direction with respect to the same radial direction.