Motorcycle Intake Tube Funnel Design for Liquid Drainage
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Solution Overview
Problem
The existing intake systems for motorcycles lack sufficient capacity in the intake chamber, which affects engine intake performance and allows liquid intake air spitting components to contaminate the intake air, reducing efficiency.
Innovation Solution
The intake system includes a connecting tube with a tubular main tube portion and a funnel-shaped portion that broadens towards the air cleaner, forming an enlarged intake chamber, along with a drain mechanism to discharge liquid components and a blow-by gas passage to collect oil, enhancing chamber capacity and reducing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the connecting tube is formed with a conventional tubular structure, then the structure is simple, but the intake chamber capacity is insufficient leading to poor intake performance
Solution Approach 1:
The connecting tube transitions from a simple linear tubular structure to a three-dimensional funnel-shaped structure that expands in multiple directions. The funnel portion broadens as it approaches the air cleaner from the intermediate portion of the main tube, creating additional volume in the intake chamber without proportionally increasing the linear length of the connecting tube.
Solution Approach 2:
The cross-sectional area parameter of the connecting tube is changed along its length. The tube maintains a relatively constant cross-section in the main tube portion, then transitions to a funnel shape where the cross-sectional area increases progressively toward the air cleaner connection, thereby increasing the overall intake chamber capacity.
2Productivity
If the intake chamber capacity is increased to improve intake performance, then charging efficiency improves, but the influence of liquid intake-spitting components on intake air increases
Solution Approach 1:
The connecting tube is segmented into distinct functional portions: a main tube portion for air flow, a funnel portion for expanding intake chamber capacity, and a drain means for removing liquid contaminants. This segmentation allows each portion to perform its specific function optimally while working together to achieve both high intake performance and effective liquid removal.
Solution Approach 2:
The drain means acts as an intermediary mechanism that intercepts and removes liquid intake-spitting components before they can contaminate the intake air. The drain connects to the lower portion of the funnel and communicates with the lowest portion of the intake chamber, providing a dedicated pathway for liquid removal that is separate from the main air flow path.
Data Source
AI summary
An intake system for a vehicle includes a connecting tube disposed to bypass one side of a rear shock absorber. The capacity of the intake chamber is increased to achieve an improvement in intake performance and to reduce the influence of a liquid intake-spitting component on intake air. The connecting tube is formed to include a tubular main tube portion and a funnel portion installed integrally and consecutively with the main tube portion. The funnel portion has a funnel-shape that broadens as it nears the air cleaner with an opening of the main tube portion on the upstream end. An intake chamber serving as part of a purified-air chamber formed between the funnel portion and the cleaner case is formed at least below the main tube portion. A drain member is provided with the lower portion of the funnel portion to communicate with the lowest portion of the intake chamber.