Motorcycle Exhaust Muffler Inner Cylinder Welding
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Solution Overview
Problem
Existing exhaust systems for motorcycles face challenges in reducing muffler weight while maintaining effective sound silencing, as conventional methods either increase weight with multiple pipes or fail to prevent exhaust sound leakage due to sound-absorbing materials dispersing and allowing gas entry.
Innovation Solution
The exhaust system features an inner cylinder within an outer cylinder, separated into expansion chambers with a communicative passage between them, where the edge parts of the inner cylinder are welded to the outer cylinder, eliminating the need for conventional pipes and preventing exhaust gas entry into the space between cylinders, thus reducing weight and ensuring sound silencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a plurality of communicative pipes are disposed in the muffler to separate expansion chambers, then exhaust sound is reduced, but the weight of the muffler increases and traveling performance deteriorates
Solution Approach 1:
The patent merges the communicative passage function into the inner cylinder structure itself, eliminating the need for separate pipe components. The inner cylinder is designed with integrated passages that serve as both structural elements and flow channels, reducing the total number of parts and overall weight while maintaining the exhaust sound reduction function.
Solution Approach 2:
The inner cylinder serves multiple functions simultaneously: it acts as a structural component, forms expansion chambers, provides communicative passages between chambers, and functions as a sound dampening element. This multi-functionality eliminates the need for dedicated separate pipes, reducing weight while maintaining performance.
2Weight of moving object
If glass wool is filled in the space between cylinders to reduce weight, then muffler weight is reduced, but exhaust sound leaks outside from the space
Solution Approach 1:
The patent removes the glass wool filling material from the design entirely. Instead of filling the space between cylinders with sound-absorbing material, the invention uses the inner and outer cylinders as structural boundaries with integrated passages, eliminating the source of sound leakage while maintaining weight reduction benefits.
Solution Approach 2:
The patent eliminates the need for glass wool filling material, replacing it with a permanent welded structure between the inner and outer cylinders. This provides a more reliable long-term solution that prevents sound leakage without requiring additional filling materials.
3Object-affected harmful factors
If the inner cylinder is welded to the outer cylinder at edge parts of the communicative passage, then exhaust sound leakage is prevented, but manufacturing complexity increases
Solution Approach 1:
The welding process is segmented into discrete points at the edge parts of the communicative passage rather than requiring complete circumferential welding. This localized welding approach prevents sound leakage at critical points while reducing the overall welding time and complexity compared to full perimeter welding.
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
This design effectively reduces muffler weight and cost while maintaining a silencing effect by preventing exhaust sound leakage, improving engine performance and stability.
Implementation Method 1
both edge parts of a part constructing the communicative passage of the inner cylinder contact the outer cylinder and are welded thereto
Data Source
AI summary
An exhaust system for an engine that reduces muffler weight, assures a silencing effect and prevents a leak of exhaust gas. A muffler has an inner cylinder disposed in an outer cylinder, and is separated into a plurality of expansion chambers. A communicative passage for communicatively connecting the expansion chambers together is formed between the outer and inner cylinders. Edge parts of the communicative passage contact the outer cylinder and are welded thereto.