Composite Brake Chamber Housing Corrosion and Weight Reduction
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Solution Overview
Problem
Service brake chambers in heavy vehicles made from steel sheets face issues with corrosion, high production costs due to precise machining requirements, dimensional tolerance failures, and weight-related inefficiencies, along with potential sealing and burr problems during connection processes.
Innovation Solution
The service brake chamber employs composite pressure and non-pressure housings made from a non-metallic polymeric matrix reinforced with glass fiber or carbon fiber, using keyways and wedges for secure connection without damaging the components, eliminating the need for welding and coating, and providing enhanced corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel sheet is used for pressure housing and non-pressure housing, then strength and structural integrity are ensured, but corrosion resistance deteriorates and protective coatings are required
Solution Approach 1:
The patent applies composite materials by using a polymeric matrix material (such as polyamide, polypropylene, or polyester) reinforced with mineral fillers (like glass fiber, calcium carbonate, or talc) to manufacture both the pressure housing and non-pressure housing. This composite structure provides both the required mechanical strength and inherent corrosion resistance, eliminating the need for protective coatings while maintaining structural integrity under brake chamber operating conditions.
2Manufacturing precision
If precise machining operations (punching, machining, stoning) are performed on steel sheet parts, then connection precision and sealing are improved, but production costs and manufacturing complexity increase
Solution Approach 1:
The patent changes the material parameter from metal to polymer composite, which fundamentally alters the manufacturing process. Instead of requiring punching, machining, and stoning operations typical for metal parts, the polymeric material allows for direct molding of connection surfaces and sealing features during injection molding or similar forming processes. This eliminates multiple secondary operations, reduces manufacturing complexity, and maintains precise connection dimensions through mold-based geometry control.
3Strength
If steel sheet is used for brake chamber housing, then structural strength is maintained, but weight increases leading to fuel consumption and vibration issues
Solution Approach 1:
The patent uses polymeric matrix materials reinforced with mineral fillers to create a composite structure that achieves the required structural strength with significantly reduced weight compared to steel sheet constructions. The reinforced polymer provides sufficient mechanical properties for brake chamber housing while being lighter, thereby reducing vehicle weight, fuel consumption, and vibration-related problems.
4Reliability
If clamp ring and clamp ring bolt connection method is used, then sealing is provided through diaphragm compression, but additional components and assembly complexity are introduced
Solution Approach 1:
The patent merges the housing formation and connection functions into an integrated structure. The pressure housing and non-pressure housing are designed with complementary forming surfaces that directly mate together, eliminating the need for separate clamp rings and clamp ring bolts. The sealing function is integrated into the housing design through molded sealing surfaces and recesses that accommodate the diaphragm, reducing the number of components while maintaining sealing reliability.
5Reliability
If burr-free connecting surfaces are achieved through additional operations, then sealing and operation reliability are improved, but production time and costs increase
Solution Approach 1:
The patent incorporates burr-free connecting surfaces as an inherent feature of the molding process. The polymeric material and mold design ensure that connecting surfaces are formed without burrs or rough edges during the primary forming operation, eliminating the need for subsequent deburring or finishing operations. This preliminary action of creating clean surfaces during molding maintains operational reliability while preserving production efficiency.
Data Source
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AI summary
This invention is related to a service brake chamber manufactured with a composite pressure housing and a non-pressure housing, used in the air brake system of heavy vehicles such as trucks, trailers lorries and buses and a connection method of pressure housing and non-pressure housing forms this chamber.