Motorcycle Air Cleaner Intake Passage Layout
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Solution Overview
Problem
In straddle-type vehicles with CVT as a power transmission apparatus, the intake passages for the air cleaner and the CVT housing case interfere with each other, making it difficult to provide both simultaneously, and the existing air inlet port design is insufficient in preventing dust from entering the air cleaner, especially in dusty areas, leading to potential clogging.
Innovation Solution
The intake passage for the air cleaner is efficiently disposed to the right of the vehicle center line, with the air inlet port positioned between the right side wall of the storage box and the left of the right seat frame, reducing interference with the CVT intake passage and minimizing dust entry, while the muffler is offset to prevent heat transfer to the air cleaner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the intake passage for the air cleaner is disposed similar to the intake passage for the CVT housing case, then the structure is simplified, but the intake passages interfere with each other making it difficult to provide both simultaneously
Solution Approach 1:
The air inlet port is repositioned from a conventional location to the space between the right side wall of the storage box and the left of the right seat frame, utilizing an underutilized spatial dimension. This dimensional relocation allows the air cleaner intake passage to coexist with the CVT housing case intake passage without interference, resolving the spatial conflict while maintaining structural simplicity
2Device complexity
If the air inlet port opens obliquely upward toward the space below the seat, then the structure is simplified, but dust enters the air cleaner increasing the risk of clogging
Solution Approach 1:
The air inlet port is given a specific directional orientation toward the right side wall of the storage box, creating a localized airflow pattern that draws air from a cleaner source. This local quality modification changes the airflow characteristics to prevent dust-laden air from entering, while maintaining the simplicity of the port structure itself
Data Source
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AI summary
A motorcycle (1) includes a body frame having left and right seat frames, a storage box (180) having a right side wall (182) positioned to the left of the right seat frame, an air cleaner (100) connected to an intake pipe, and an intake passage (130) having an air inlet port (122) for sucking air, the intake passage (130) extending upward from the air cleaner (100). The intake passage (130) is disposed to the right of the vehicle center line. The air inlet port (122) is disposed on the right of the right side wall (182) of the storage box (180) and on the left of the right seat frame. At least a portion of the air inlet port (122) of the intake passage (130) faces the right side wall (182) of the storage box (180).