Outboard Motor Engine Cover Air Guide for Rust Prevention
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Solution Overview
Problem
Outboard motors operating on water face the challenge of rust formation due to high humidity in the cooling air used for engine cooling, which can lead to corrosion of metal components.
Innovation Solution
The design incorporates a configuration with separate air inlet ports and guide portions that facilitate gas-liquid separation of the high-humidity air, allowing low-humidity cooling air to contact the engine while separating moisture, which is then stored and discharged, preventing rust and corrosion. This includes a protective member covering the engine, guide portions to direct air downward, and a lower housing with a storage portion and drain port to manage moisture effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If outside air is used for engine cooling, then cooling effect is improved, but moisture in the air causes rust on metal components
Solution Approach 1:
The air inlet ports are divided into multiple locations (front side and side surface of engine cover) to create separate air intake paths. This segmentation allows different air flows to be directed to different areas, facilitating moisture separation while maintaining cooling effectiveness.
Solution Approach 2:
Guide portions are introduced as intermediary structures between the air inlet ports and the engine. These guide portions direct the outside air downward and facilitate gas-liquid separation, acting as a mediator that removes moisture from the cooling air before it contacts the engine components.
2Object-affected harmful factors
If guide portions are added to direct air downward, then moisture separation is improved, but device complexity increases
Solution Approach 1:
The guide portions serve multiple functions: they direct outside air downward, facilitate gas-liquid separation, and guide separated moisture to the storage portion. By making these components multi-functional, the patent reduces the need for additional separate parts, thereby limiting the increase in device complexity.
Solution Approach 2:
The guide portions are integrated with the engine cover structure, merging the guidance function with the existing housing. This integration approach combines multiple functions into existing components rather than adding entirely separate systems, thus minimizing complexity increase.
3Object-affected harmful factors
If moisture is stored in a separate portion, then rust prevention is improved, but device complexity increases
Solution Approach 1:
The storage portion is nested within the lower housing structure, with the guide portions extending into the storage portion to direct moisture. This nesting approach allows the moisture storage and discharge system to be integrated within the existing housing space, minimizing additional complexity while effectively separating and managing moisture.
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
The solution effectively prevents rust and corrosion by dehumidifying the cooling air before it contacts the engine components, ensuring efficient cooling and maintaining the integrity of metal components, while also enhancing the seal performance and preventing leakage.
Implementation Method 1
the outside air will undergo gas-liquid separation in a process of being guided into the front side guide portion or the rear side guide portion
Data Source
AI summary
An outboard motor is provided with: an engine cover in which a first outside air inlet port, an exhaust port, and second outside air inlet ports are formed; and a lower housing that is disposed below the engine cover. The engine cover is provided with a front guide and a rear guide that guide outside air, introduced respectively from the first outside air inlet port and the second outside air inlet ports into the engine cover, downward in the gravity direction.