Ventilated Brake Rotor Fin Layout for Higher Cooling Airflow
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Solution Overview
Problem
Existing ventilated disk rotors for vehicle brakes have limitations in cooling efficiency due to suboptimal airflow velocity and surface area utilization between cooling fins, leading to inefficient heat dissipation.
Innovation Solution
The disk rotor design incorporates radial and second fins arranged in a specific configuration to enhance airflow velocity, generate turbulent flow, and increase surface areas, with oval fins on the inner periphery and circular or oval second fins on the outer periphery, and additional third fins to compensate for pressure decreases and stabilize brake surface pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single radial fin is used for cooling, then the structure is simple, but the cooling efficiency is insufficient due to low airflow velocity and inadequate turbulent flow generation
Solution Approach 1:
The single radial fin is segmented into multiple fins (first radial fin, second radial fin, and intermediate radial fin) arranged circumferentially. This segmentation increases the total fin surface area and creates multiple airflow channels, enhancing heat dissipation efficiency while maintaining manufacturing feasibility through standardized fin components
Solution Approach 2:
The fin structure is extended from a single radial dimension to include circumferential arrangement with multiple fins. The intermediate radial fin positioned between the first and second radial fins adds a circumferential dimension to the cooling structure, increasing surface area and promoting turbulent flow without significantly complicating the radial manufacturing process
2Area of stationary object
If cooling fin surface area is increased, then heat dissipation improves, but the airflow velocity between fins decreases
Solution Approach 1:
Different fin regions are optimized for different functions: the first and second radial fins are positioned to maximize surface area for heat dissipation, while the intermediate radial fin is strategically positioned to maintain optimal spacing for airflow velocity. The circumferential arrangement ensures local optimization of both surface area and flow characteristics in different regions of the brake rotor
3Stability of the object's composition
If laminar flow is maintained between fins, then flow stability is high, but heat transfer coefficient is significantly lower compared to turbulent flow
Solution Approach 1:
The fin structure is designed to dynamically transition the airflow from laminar to turbulent regime. The intermediate radial fin creates flow disturbances that promote turbulence in the boundary layer between fins, significantly enhancing the heat transfer coefficient. The circumferential arrangement of multiple fins creates varying flow paths that maintain dynamic turbulence throughout the cooling process
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 cooling efficiency by increasing the heat transfer coefficient through enhanced airflow velocity and surface areas, resulting in improved heat dissipation performance compared to traditional designs.
Implementation Method 1
pumping performance by the oval fin positioned on the inner periphery side helps improve the airflow velocity
Implementation Method 2
generating turbulent flow by second fins. The heat transfer coefficient of this turbulent flow is significantly larger than that of laminar flow
Implementation Method 3
cool itself by taking traveling air from an inner periphery of the disk rotor into a ventilation hole between circumferentially adjacent cooling fins
Data Source
AI summary
A disk rotor of a vehicle brake with improved efficiency in cooling the disk rotor by a synergy effect that comes from ensuring velocity of airflow flowing between cooling fins, ensuring surface areas of the cooling fins, and generating turbulent flow by second fins. A plurality of cooling fins each extending radially from an inner peripheral edge to an outer peripheral edge of a disk rotor are provided inside the disk rotor at intervals in the circumferential direction. Each of the plurality of the cooling fins includes a radial fin extending radially and a second fin spaced apart from the radial fin in the radial direction.