Brake Drum Cooling Conduits for Controlled Thermal Distribution
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Solution Overview
Problem
Existing brake drum designs for vehicles, particularly in heavy-duty applications, face challenges in controlling cooling effectively, leading to undesirably large cooling in certain areas which can impact braking performance.
Innovation Solution
A brake drum with a cooling arrangement featuring a set of cooling conduits between the braking surface and the outer surface, where the inner and outer axial cross-sections have different aggregate thermal conductances, allowing for controlled cooling by varying the cross-sectional areas and radial distances of the conduits, ensuring appropriate temperature distribution for optimal braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ventilation openings are arranged in the brake drum to control cooling, then cooling can be provided, but undesirably large cooling of certain areas occurs
Solution Approach 1:
The brake drum is segmented into multiple cooling zones with distinct cooling characteristics. Different regions of the drum wall contain cooling channels with varying cross-sectional areas, allowing independent temperature control in different axial and radial zones. This segmentation enables precise thermal management without causing excessive cooling in any single area.
Solution Approach 2:
Different regions of the brake drum are assigned different thermal properties through locally varied cooling channel dimensions. The inner and outer axial cross-sections have different aggregate thermal conductances, creating localized cooling zones that match the specific thermal requirements of each region, thereby avoiding uniform over-cooling.
2Reliability
If cooling conduits are added to control braking surface temperature, then braking performance is improved, but device complexity increases
Solution Approach 1:
The drum wall itself serves dual functions: as the structural component containing the braking surface and as the cooling system housing. The cooling channels are integrated directly into the drum wall structure, eliminating the need for separate cooling devices and reducing overall system complexity while maintaining effective temperature control.
Solution Approach 2:
The cooling channels are nested within the drum wall structure, with the cooling arrangement contained inside the brake drum housing. This nested configuration allows the cooling system to be integrated into the existing drum geometry without adding external complexity.
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 enables controlled cooling of the brake drum, enhancing braking capacity by maintaining the braking surface temperature within an optimal range, thereby improving the braking effect and efficiency.
Implementation Method 1
The material of the brake drum located radially between the set of cooling conduits and the braking surface at the inner axial cross-section has an inner axial aggregate thermal conductance. The material of the brake drum located radially between the set of cooling conduits and the braking surface at the outer axial cross-section has an outer axial aggregate thermal conductance.
Data Source
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AI summary
A brake drum (24) for a drum brake for a vehicle. The brake drum (24) comprises a braking surface (26) adapted to receive at least one brake shoe of the drum brake (22). The braking surface (26) has a circumferential extension in a circumferential direction (C) and an axial extension in an axial direction (A). The brake drum (24) further comprises an outer surface (32) at least partially enclosing the braking surface (26). The brake drum (24) further comprises a cooling arrangement (30) comprising a set of cooling conduits (34, 36, 38) located between the braking surface (26) and the outer surface (32) and extending at least partially in the axial direction (A). The brake drum (24) comprises an inner axial cross-section (I) and an outer axial cross-section (II) which are located within the axial extension of said braking surface (26), wherein when the brake drum (24) is mounted to the vehicle (10), the inner axial cross-section (I) is located closer to the centre plane than the outer axial cross-section (II), as seen in the axial direction (A). The cooling arrangement (30) also extends through each one of the inner axial cross-section (I) and the outer axial cross-section (II). The material of the brake drum (24) located radially between the set of cooling conduits (34, 36, 38) and the braking surface (26) at the inner axial cross-section (I) has an inner axial aggregate thermal conductance and the material of the brake drum (24) located radially between the set of cooling conduits (34, 36, 38) and the braking surface (26) at the outer axial cross- section (II) has an outer axial aggregate thermal conductance. The inner axial aggregate thermal conductance is different from the outer axial aggregate thermal conductance.