Outboard Engine Heat Exchanger Positioning for Cooling and Drag
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Solution Overview
Problem
Conventional outboard engines face inefficiencies in cooling the coolant due to the heat exchanging part being installed behind the engine, which is affected by heat generated, preventing effective cooling.
Innovation Solution
An outboard engine design with a heat exchanging member positioned below an anticavitation plate and above the propeller shaft, featuring oil channels for efficient cooling oil flow, allowing the heat exchanging member to remain submerged in water and reduce travel resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the heat exchanging part is installed behind the outboard engine, then the structure is simplified, but the cooling efficiency deteriorates due to heat from the engine
Solution Approach 1:
The heat exchanging member is repositioned from a horizontal arrangement behind the engine to a vertical arrangement below the anticavitation plate and above the propeller shaft. This dimensional change allows the heat exchanging member to be submerged in water for effective cooling while maintaining structural integration with the outboard engine.
2Temperature
If the heat exchanging member is positioned below the anticavitation plate and above the propeller shaft, then cooling efficiency is improved, but the device complexity increases
Solution Approach 1:
The heat exchanging member is merged with the propeller shaft assembly, forming an integrated structure where the heat exchanging member surrounds or is coupled with the propeller shaft. This combination achieves effective cooling while reducing the number of separate components and simplifying the overall structure.
3Temperature
If the heat exchanging member is submerged in water, then cooling performance is improved, but travel resistance increases
Solution Approach 1:
The heat exchanging member is designed with a streamlined shape and smooth surface that minimizes water resistance. The local geometry is optimized to allow water to flow smoothly around it, reducing drag while maintaining effective heat exchange surface area for cooling.
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 design ensures efficient cooling of the cooling oil through water heat exchange while traveling, reducing travel resistance by maintaining the heat exchanging member's horizontality and avoiding interference with the propeller.
Implementation Method 1
a heat exchanging member 40 is provided that is positioned below an anticavitation plate 37 and above a propeller shaft 20
Implementation Method 2
by forming oil channels in the heat exchanging member, the cooling oil flowing in the oil channels can be efficiently cooled
Implementation Method 3
the heat exchanging member can be cooled with running water while a vessel is travelling using the outboard engine
Data Source
AI summary
There are included: a motor contained in a top cover; a vertical shaft that is rotationally driven by the motor, the vertical shaft being contained in an extension casing; and a propeller that is rotationally driven by the vertical shaft, the propeller being provided at a gear casing. A heat exchanging member is provided that is positioned below an anticavitation plate and above a propeller shaft that rotationally drives the propeller, and inside the heat exchanging member, a cooling oil channel member is provided that cooling oil for cooling the motor flows through.