Annular Drum Brake Extraction Chamber for Dust and Heat Control
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Solution Overview
Problem
Existing drum brake systems generate dust particles that pose health risks and cause thermal damage, with current solutions either requiring frequent disassembly or design modifications, or being inefficient in existing systems.
Innovation Solution
A drum brake with an annular suction chamber comprising a brake drum, brake shield, and suction ring, featuring a suction ring attached to the brake shield, an annular chamber, and a directional flap to guide air containing dust particles into an extraction port, with a filter insert to capture dust and cooling fins to prevent thermal damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If air is extracted from the drum brake interior through conventional openings in the brake shield, then dust particles can be removed, but the extracted air causes thermal damage to the extraction system and the largest dust escape area remains uncovered
Solution Approach 1:
The invention transitions from conventional point or linear extraction openings to a three-dimensional annular chamber that surrounds the brake drum peripherally. This annular extraction chamber is formed between the brake shield and the brake drum, creating a volumetric extraction zone that captures dust particles from the entire circumferential area, not just localized regions. The annular geometry provides comprehensive coverage of the dust generation zone while distributing the extraction function across a continuous three-dimensional space.
Solution Approach 2:
The patent introduces a suction ring as an intermediary component that is attached to the brake shield and forms part of the annular extraction chamber. This suction ring acts as a mediator between the brake drum and the extraction system, providing a structured interface for dust capture. The suction ring includes suction openings that face the brake drum, creating an intermediate extraction zone that efficiently captures dust before it can escape into the environment or cause thermal damage to downstream components.
2Object-generated harmful factors
If extraction openings are located in the brake shield, then dust extraction is possible, but the largest dust escape area in the annulus between the edge of the drum and the brake shield is not covered
Solution Approach 1:
The invention transitions from conventional point or linear extraction openings to a three-dimensional annular chamber that surrounds the brake drum peripherally. This annular extraction chamber is formed between the brake shield and the brake drum, creating a volumetric extraction zone that captures dust particles from the entire circumferential area, not just localized regions. The annular geometry provides comprehensive coverage of the dust generation zone while distributing the extraction function across a continuous three-dimensional space.
Solution Approach 2:
The annular extraction chamber serves multiple functions simultaneously: it captures dust particles from the entire circumferential area, cools the brake drum through increased air flow, and prevents dust escape at the annular region between the drum edge and brake shield. This multi-functional design eliminates the need for separate extraction openings and cooling systems, providing comprehensive dust extraction coverage across all critical areas.
3Object-generated harmful factors
If magnetic elements are used to capture metal dust in the brake drum area, then dust removal is achieved, but the brake must be regularly disassembled and the magnets cleaned
Solution Approach 1:
The annular extraction chamber system operates autonomously to capture and remove dust particles without requiring manual intervention for maintenance. The continuous air flow through the annular chamber naturally carries dust particles to the extraction openings, eliminating the need for manual cleaning of magnetic elements. The system self-regulates dust capture through the pressure differential created by the extraction fan, providing sustained dust removal capability without regular disassembly or maintenance.
Solution Approach 2:
The invention extracts the dust capture function from the brake drum interior and relocates it to the annular chamber formed between the brake drum and brake shield. By positioning the extraction chamber in this intermediate zone, the system captures dust particles as they are generated and transported by air flow, preventing them from accumulating in the brake drum interior. This extraction approach eliminates the need for magnetic elements attached to the brake drum that would require disassembly for cleaning.
4Object-generated harmful factors
If design modifications are made during brake manufacturing to implement dust extraction, then dust removal is possible, but the solution cannot be applied to existing systems
Solution Approach 1:
The dust extraction system is segmented into modular components: the annular extraction chamber formed between the brake shield and brake drum, the suction ring with extraction openings, and the connected extraction fan. This segmentation allows the extraction system to be added as a separate module to existing brake assemblies without modifying the original brake design. The suction ring can be attached to the brake shield, and the annular chamber utilizes the existing space between the brake components, enabling retrofit installation on existing systems.
Solution Approach 2:
The annular extraction chamber is nested within the existing brake assembly structure, utilizing the space between the brake drum and brake shield. The suction ring is attached to the brake shield and forms part of this nested annular structure. This nesting approach allows the dust extraction system to be integrated into existing brake designs without requiring fundamental redesign, as the extraction chamber occupies the existing annular space that already exists in conventional brake assemblies.
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
Effectively captures and removes dust particles while preventing thermal damage to the extraction system, applicable to both new and existing drum brakes without requiring design modifications.
Implementation Method 1
an annular chamber comprising at least one filter insert is defined between the brake drum, the brake shield and the suction ring
Implementation Method 2
a suction ring is attached to the brake shield, the edge of which lies tightly against the outer surface of the brake drum, the suction ring comprising a suction mouth
Implementation Method 3
with a filter insert to capture dust and cooling fins to prevent thermal damage
Data Source
Figure 1
Figure 2~3
AI summary
A drum brake with an annular extraction chamber (7), this drum brake comprising a brake drum (2), a brake shield (3), and an extraction ring (4). A extraction ring (4) is attached to the brake shield (3), the edge of which lies closely against the outer surface of the brake drum (2). The extraction ring (4) comprises at least one extraction opening (8). An annular chamber (7) comprising at least one filter insert (12) is defined between the brake drum (2), the brake shield (3), and the extraction ring (4).