Brake Drum Sealing Ring for Fine Particle Containment
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Solution Overview
Problem
Drum brake systems release polluting particles, particularly fine particles smaller than 10 µm, into the atmosphere during braking, posing a risk to respiratory health.
Innovation Solution
A brake drum with a sealing ring and sealing elements, made of high-temperature resistant materials, is integrated to confine and trap particles within the drum, using screws and/or clips for attachment, and optionally electrostatic charging for enhanced retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a drum brake system is used, then it is more economical than disc brake system, but it releases polluting particles into the atmosphere during braking
Solution Approach 1:
The patent converts the harmful centrifugal force that propels particles outward into a beneficial containment mechanism. The sealing ring is strategically positioned to utilize the centrifugal force generated during drum rotation to press the sealing element against the drum's peripheral wall, creating an effective barrier that traps particles inside the drum rather than allowing them to escape into the atmosphere.
Solution Approach 2:
The sealing ring acts as an intermediary barrier between the brake drum interior and the external atmosphere. It comprises a sealing element that directly contacts and traps particles, preventing their release while allowing the brake system to continue functioning normally. This intermediary structure resolves the contradiction by blocking particle emission without interfering with the braking mechanism.
2Object-generated harmful factors
If a sealing ring is added to reduce particle diffusion, then air quality is improved, but device complexity increases
Solution Approach 1:
The sealing element is designed as a flexible, thin component that can deform to conform to the drum's peripheral wall surface. This flexibility allows the sealing element to effectively trap particles of various sizes while maintaining a simple, lightweight structure. The thin-film design minimizes the added complexity and weight compared to rigid sealing alternatives.
Solution Approach 2:
The sealing ring is constructed as a composite structure combining a support ring with a sealing element made of elastomeric or foam material. This composite design provides both structural integrity for mounting and effective sealing capability, achieving particle containment with a relatively simple integrated component rather than multiple separate parts.
3Object-generated harmful factors
If the sealing ring extends radially into the brake drum interior, then particle containment is enhanced, but the brake drum's internal space is reduced
Solution Approach 1:
The sealing ring extends radially into the drum interior only to the extent necessary to effectively trap particles, rather than occupying excessive space. The sealing element's radial projection is optimized to create sufficient barrier coverage for particle containment while minimizing the reduction of internal brake drum volume, achieving partial action that balances containment effectiveness with space preservation.
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 reduces the diffusion of particles into the air, facilitating easy maintenance and cleaning, thereby improving air quality and safety.
Implementation Method 1
at least one sealing element capable of reducing the diffusion of particles into the air resulting from brake drum wear during braking
Implementation Method 2
the sealing ring is electrostatically charged
Data Source
Figure 1
Figure 2
AI summary
Brake drum (2) for a braking device (1) for a motor vehicle, comprising a base (4) and a peripheral wall (5) extending from the base (4). The brake drum (2) comprises a sealing ring (7) having means for attachment (8) to the peripheral wall (5) of the brake drum (2) and at least one sealing element (9) suitable for reducing the diffusion of particles into the air resulting from wear of the brake drum (2) during braking. The sealing ring (7) has a torus shape.