Braking Band Ventilation Duct Surface Structure
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Solution Overview
Problem
Existing ventilated disk brake bands experience inadequate air flow on the inner surfaces during braking, leading to inefficient cooling due to flow resistance and an attached air layer that reduces air contact with the surface.
Innovation Solution
A surface structure with alternating ridges and valleys on the inner surfaces of the ventilation duct, increasing air speed and reducing flow resistance by promoting turbulence and air mixing, with impressions having depths exceeding 0.3 mm and diameters between 2-5 mm, arranged to form various patterns such as grid-like or honeycomb.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the ventilation duct has a smooth inner surface, then the flow resistance is lower, but the air layer remains attached to the surface reducing cooling efficiency
Solution Approach 1:
The patent applies local quality by creating impressions (local modifications) on specific portions of the inner surface of the ventilation duct. These impressions are not uniformly distributed but are strategically placed to create alternating ridges and valleys that locally disturb the air flow, promoting turbulence and mixing while maintaining smoother areas elsewhere.
Solution Approach 2:
The patent replaces the conventional smooth mechanical surface with a structured surface featuring impressions, ridges, and valleys. This substitution transforms the laminar flow regime into a turbulent one, enhancing heat transfer efficiency without requiring active mechanical intervention.
2Productivity
If the air flow speed through the ventilation duct is increased, then the total flow rate increases, but the air layer detachment reduces the amount of air contacting the inner surface
Solution Approach 1:
The patent creates mechanical disturbances in the air flow through the impressions, ridges, and valleys structure. These geometric features induce turbulence and periodic flow separation, which enhance mixing between the air layers and increase the amount of air contacting the inner surface, thereby improving cooling efficiency.
Solution Approach 2:
The patent changes the physical parameters of the air flow by introducing turbulence through the structured surface. This transforms the flow regime from laminar to turbulent, altering the flow characteristics to enhance heat transfer while maintaining acceptable flow resistance.
3Temperature
If impressions with depth exceeding 0.3 mm are created on the inner surface, then air speed and turbulence increase, but the manufacturing complexity increases
Solution Approach 1:
The patent applies partial action by creating impressions with specific depth ranges (exceeding 0.3 mm, preferably exceeding 0.5 mm, most preferably ranging between 0.5 mm and 1.0 mm) rather than modifying the entire surface uniformly. This targeted approach achieves the desired turbulence effect while limiting the overall structural complexity and manufacturing difficulty.
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
Significantly increases the amount of air blowing on the inner surfaces, enhancing cooling efficiency and kinetic energy dissipation during braking.
Implementation Method 1
This speed increase entails an increase in the kinetic energy of the air, which results in small turbulences and local detachments of the air from the surface
Implementation Method 2
This speed increase entails an increase in the kinetic energy of the air
Implementation Method 3
the cooling effect of the internal ventilation of the ventilated braking bands depends, besides on the area of the inner surface of the ventilation duct, also and mainly on the amount of fresh air that blows on said inner surface during a braking action
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
A braking band (2) of a brake disk (1) comprises two plates (3, 3') which are connected by means of connecting elements (4) such as to internally form a ventilation duct (7) that is at least partially defined by inner surfaces (8, 81) of the plates (3, 31) and that extends from an inlet opening (10) that is radially internal relative to an axis of rotation (S) of the braking band (2) to an outlet opening (11) that is radially external relative to the axis of rotation (S). At least one of the inner surfaces (8, 81) comprises a plurality of impressions (15) that are arranged such as to define a surface structure with alternated ridges (16) and bottoms (17) in the flow direction from the inlet opening (10) to the outlet opening (11).