Motorcycle Air Cleaner Box Vertical Layout for Compact Capacity
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Solution Overview
Problem
The air cleaner box of saddle-ride type vehicles faces a tradeoff between achieving sufficient capacity and maintaining a compact design, balancing soundproofness, dustproofness, and maintainability while minimizing size and complexity.
Innovation Solution
The air cleaner box is designed with a rearward-descending shape extending from the upper side to the rear side of the cylinder assembly, featuring a maximum height equal to or greater than its front-rear length, with a front surface narrowing diagonally and positioned above the cylinder assembly, allowing for a compact and efficient layout that includes an air intake passage and shock absorber integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air cleaner box capacity is increased to improve soundproofness and dustproofness, then the box size becomes larger, but the vehicle design becomes less compact
Solution Approach 1:
The air cleaner box transitions from a conventional horizontal elongation to a vertical elongation, standing upright with its longest dimension in the height direction rather than the front-rear direction. This dimensional reorientation allows the box to achieve sufficient capacity for soundproofness and dustproofness while maintaining a compact footprint that does not protrude beyond the vehicle's overall envelope, thus resolving the contradiction between capacity and compactness.
2Volume of stationary object
If the air cleaner box is designed with a complex shape to maximize space usage, then the box capacity increases, but the manufacturing complexity increases
Solution Approach 1:
The air cleaner box is divided into multiple functional segments: a vertically elongated main body for capacity, a front surface for airflow intake, a rearward-descending portion for spatial integration, and side surfaces for structural support. This segmentation allows each portion to be optimized for its specific function while maintaining overall manufacturing simplicity through modular construction and standard joining methods.
Data Source
AI summary
A motorcycle is provided with an engine unit having a crankcase and a cylinder assembly protruding diagonally frontward and upward from the crankcase. An air cleaner box has a rearward-descending shape extending from the upper side to the rear side of the cylinder assembly as seen in a side view to form a vertically elongating box shape. The air cleaner box is disposed between left and right frames of a chassis, and both side surfaces of the air cleaner box are separated from the chassis. The air cleaner box has a frontward-narrowing and rearward-narrowing width as seen in a top view. As a result, it is possible to obtain a sufficient box capacity and facilitate a compact design. In addition, it is possible to smoothly flow an air stream in the lateral sides of the air cleaner box.