Silencer External Cylinder Metallic Layer Protection
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Solution Overview
Problem
Silencers with carbon fiber reinforced plastics external cylinders face damage from high-temperature exhaust gases, and existing solutions like metallic layers are damaged during refilling of acoustic absorbents due to contact with cap and exhaust pipe components.
Innovation Solution
A silencer design featuring a tubular body made from resin material with a metallic layer on its inner surface, covered by anterior and posterior covering portions to prevent damage during refilling, where the metallic layer's ends are strategically positioned to avoid contact with the cap and tail cap components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metallic layer is provided on the inner surface of the external cylinder to prevent exhaust gas contact, then the external cylinder is protected from thermal damage, but the metallic layer is damaged during refilling operations when caps and pipes contact it
Solution Approach 1:
The silencer is divided into separate modular components (external cylinder with metallic layer, internal cylinder, cap, exhaust pipe) that can be independently assembled and disassembled. This segmentation allows refilling operations to be performed by detaching and reattaching components without directly contacting the metallic layer, thus protecting it from damage while maintaining ease of maintenance.
Solution Approach 2:
The internal cylinder acts as an intermediary component between the metallic layer and the refilling operations. During assembly and disassembly, the internal cylinder and its associated components (cap, exhaust pipe) interact with each other rather than directly with the metallic layer, serving as a protective mediator that prevents damage to the metallic coating.
2Reliability
If the metallic layer extends to the ends of the external cylinder, then maximum protection is provided, but the cap and exhaust pipe inevitably contact and damage the metallic layer during attachment and detachment
Solution Approach 1:
The metallic layer is applied with specific local positioning rather than uniform full coverage. The layer extends along the cylindrical surface but is strategically positioned to provide protection where thermal contact occurs, while allowing end regions to be covered by the internal cylinder structure. This local quality approach maintains protective function while preventing damage during assembly operations.
Solution Approach 2:
The internal cylinder is nested within the external cylinder, creating a layered structure where the internal cylinder's end portions extend beyond the metallic layer's boundaries. This nesting arrangement allows the internal cylinder to physically shield the metallic layer ends from contact with caps and pipes during assembly, preventing damage while maintaining maximum protection coverage.
Data Source
AI summary
A silencer capable of preventing a damage of a metallic layer formed on an inner surface of an external cylinder formed from CFRP, and the external cylinder for the silencer. The silencer 1 includes the external cylinder 2, an internal cylinder 3 and an acoustic absorbent (not shown). A posterior end 2r of the external cylinder 2 is detachably provided with a tail cap 4. An anterior end 2f of the external cylinder 2 is detachably provided with a coupling body 5. An inner circumferential surface of the posterior end 2r of the external cylinder 2 includes a posterior covering portion 30 while an inner circumferential surface of the anterior end 2f thereof includes an anterior covering portion 32. This posterior covering portion 30 covers a posterior end portion 8r of a metallic layer 8 while the anterior covering portion 32 covers an anterior end portion 8f thereof.