Sealed Drum Brake Chamber With Air-Permeable Dust Filtration
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Solution Overview
Problem
Existing vehicle drum brakes generate brake dust that pollutes the environment, primarily from friction lining and drum shell wear, necessitating a solution to contain and prevent dust escape.
Innovation Solution
The drum brake interior is fully enclosed by walls, with at least one wall section made of filter material to allow air permeability but retain dust particles, and optionally includes a pressure compensation element to manage pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the brake drum interior is completely sealed to prevent dust escape, then environmental pollution is reduced, but pressure buildup during braking cannot be compensated
Solution Approach 1:
The patent applies porous materials (filter elements) in the wall sections of the brake drum chamber. These filter elements allow air to pass through while retaining brake dust particles, thereby enabling pressure compensation while preventing dust escape into the environment. This resolves the contradiction by providing a material that simultaneously permits gas flow and blocks solid particles.
2Object-generated harmful factors
If filter material is used in wall sections, then dust particles are retained while air exchange is maintained, but the structural integrity and sealing may be compromised
Solution Approach 1:
The patent applies local quality by differentiating the wall sections of the brake drum chamber. Some wall sections are made of filter material to allow air exchange while retaining dust, while other wall sections maintain traditional sealing properties. This localized differentiation enables the system to simultaneously achieve dust retention and pressure compensation without compromising overall structural integrity.
3Reliability
If a metal-to-metal sliding seal is used between drum and cover plate, then sealing is achieved during rotation, but brake dust can still escape through gaps
Solution Approach 1:
The patent employs composite materials by combining filter material with the structural wall sections of the brake drum. This composite construction creates an integrated system where the filter material is embedded within or attached to the wall structure, forming a unified component that provides both structural support and dust filtration functionality, preventing dust escape while maintaining rotational sealing.
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
Prevents brake dust from escaping into the environment while maintaining air exchange, effectively containing dust within the brake system.
Implementation Method 1
at least one wall section of the walls consists of a filter material permeable to air and retaining dust particles
Implementation Method 2
at least one wall section of the walls consists of a pressure compensation element
Data Source
Figure 1~2
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AI summary
The invention relates to a vehicle drum brake comprising a drum assembly surrounding an interior space (30) and formed by a drum body (11) and a covering panel (20), which is securely connected to the vehicle axle. The drum body (11) is pot shaped and formed from a drum casing (12) and a flange (13) arranged on the end side thereof. This is screwed together with a hub flange (8) of a wheel hub (6). The covering panel (20) covers the other second end side of the drum casing (12). The two brake shoes (22) are moveably mounted on the brake carrier (4) and can be spread apart against the braking surface of the drum casing (12). According to the invention, in order to reduce the environmental impact of the braking-related wear process, the interior space (30) is a chamber that is entirely surrounded by walls and sealed relative to the outside, and at least one wall section (33, 33A, 33B, 33C, 33D) of the walls consists of a filter material that is permeable for air and blocks dust particles and/or consists of a pressure compensation element (48).