Split Exhaust Mufflers for Motorcycle Weight Balance
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Solution Overview
Problem
Conventional exhaust device structures for rocking vehicles, such as motorcycles, often result in weight imbalance due to the alignment of expansion chambers in the forward-rearward direction, which can lead to instability, especially when the vehicle banks during turns.
Innovation Solution
The exhaust device structure includes independent exhaust pipes and expansion chambers arranged on either side of the vehicle center, with the expansion chambers positioned below the internal combustion engine and swing arm, allowing for effective use of space and separation in both the forward-rearward and left-right directions to improve weight balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the plurality of expansion chambers are aligned in the forward-rearward direction to make effective use of front and rear space, then the space utilization is improved, but the left-right weight balance of the vehicle deteriorates
Solution Approach 1:
The exhaust system is divided into multiple independent expansion chambers (first expansion chamber and second expansion chamber) that are separated in the left-right direction. Each expansion chamber is connected to its own exhaust pipe from separate exhaust ports, allowing them to be positioned on opposite sides of the vehicle center to improve weight balance while still utilizing front and rear space effectively.
Solution Approach 2:
The expansion chambers are positioned asymmetrically with respect to the vehicle center in the left-right direction, with the first expansion chamber on one side and the second expansion chamber on the other side. This asymmetric arrangement counterbalances the weight distribution and improves vehicle stability during banking, while the chambers remain separated in the forward-rearward direction to utilize available space.
2Adaptability or versatility
If the expansion chambers are arranged offset in the vehicle width direction, then the space arrangement flexibility is improved, but the vehicle weight balance deteriorates
Solution Approach 1:
The exhaust system is segmented into separate expansion chambers that can be independently positioned. The first expansion chamber is connected to exhaust ports on one side of the vehicle center, while the second expansion chamber is connected to exhaust ports on the other side, allowing flexible arrangement that maintains weight balance.
Solution Approach 2:
The expansion chambers are positioned to act as counterweights on opposite sides of the vehicle center. By placing the first expansion chamber on one side and the second expansion chamber on the other side, the system creates a balanced weight distribution that compensates for the offset arrangement in the vehicle width direction.
Data Source
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AI summary
Saddle riding type vehicle having an exhaust device structure, the vehicle includes: an engine (10) mounted between a front wheel (2) and a rear wheel (3); the exhaust device structure includes and a front side exhaust device (70) and a rear side exhaust device (100) that muffle exhaust gas noise from the engine (10); the front side exhaust device (70) and the rear side exhaust device (100) including a front side exhaust pipe (71) and a rear side exhaust pipe (101) having upstream ends connected to exhaust ports of the engine (10) and a first muffler (72) and a second muffler (102) connected to downstream ends of the front side exhaust pipe (71) and the rear side exhaust pipe (101), the first muffler (72) and the second muffler (102) being disposed on a lower side of the vehicle, the first muffler (72) and the second muffler (102) being arranged so as to be separated from each other in a forward-rearward direction of the vehicle, and the first muffler (72) and the second muffler (102) being arranged so as to be separated from each other in a left-right direction with respect to a vehicle center (C).