Brake Drum Projections for Heat and Strength
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Solution Overview
Problem
Existing brake drums with fine relief shapes for improved heat radiating ability suffer from insufficient drag strength and rigidity in the rotational and diametrical directions, leading to abnormal noise due to shot blasting methods.
Innovation Solution
A brake drum with a plurality of projections on its outer circumferential surface, including thin-waisted shapes, formed through centrifugal casting, enhancing drag strength, heat radiating ability, and reducing noise by improving diametrical strength and joint strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fine relief shapes are formed by shot blasting, then heat radiating ability is improved, but drag strength becomes insufficient
Solution Approach 1:
The outer circumferential surface is segmented into multiple projection portions with varying heights (first, second, and third projection portions), creating a multi-level structure that simultaneously provides surface area for heat radiation and structural integrity for drag strength
Solution Approach 2:
Different regions of the outer circumferential surface have different projection heights tailored to their specific functions: taller projections for heat radiation in non-brake contact areas, and shorter projections for maintaining drag strength in brake contact areas
2Temperature
If fine relief shapes are formed by shot blasting, then heat radiating ability is improved, but rigidity in diametrical direction becomes insufficient
Solution Approach 1:
The surface is divided into multiple projection portions with different heights, where the first projection portion with greatest height provides structural rigidity while the second and third portions provide heat radiation surface area
Solution Approach 2:
The brake drum combines different projection height regions to create a composite structural system that integrates both rigidity-providing elements and heat radiation-providing elements within the same component
3Ease of manufacture
If the brake drum structure is simplified, then manufacturing is easier, but joint strength decreases
Solution Approach 1:
The projections are formed directly during the centrifugal casting process itself, rather than requiring subsequent machining or surface treatment operations, thereby maintaining joint strength while simplifying the overall manufacturing流程
Solution Approach 2:
The formation of heat radiation structures and the casting process are merged into a single operation, where the projections are created as an integral part of the centrifugal casting process rather than as a separate post-processing step
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
The solution significantly increases drag strength and heat radiating ability while reducing abnormal noise, with improved fracture loads and drag strength compared to conventional designs.
Implementation Method 1
The brake drum is preferably produced by centrifugal casting
Implementation Method 2
Fine relief shapes are formed at the outer circumferential surface of the brake drum so as to increase the surface area and thereby improve the heat radiating ability
Implementation Method 3
efficiently conduct heat generated at the brake drum from the fine relief shapes to a wheel hub
Data Source
AI summary
A brake drum which can improve the drag strength, strength and rigidity in the diametrical direction, joint strength, and heat radiating ability, that is, a brake drum which is used for a drum brake, wherein the drum has a plurality of the projections at the outer circumferential surface, the plurality of the projections are formed at the outer circumferential surface as a whole when casting a brake drum, and at least part of the projections have thin-waisted shapes. A height of the projections is 0.3 to 5.0 mm, while the number of projections is 5 to 100/cm2. The brake drum is produced by centrifugal casting.