Oblique Ceiling Water Jacket for Marine Engine Cooling
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Solution Overview
Problem
Water-cooled marine engines with a horizontal ceiling in the cylinder head suffer from reduced cooling efficiency due to air mixing with cooling water, which accumulates and separates in the water jacket, especially during rapid acceleration and turning of small watercraft, affecting the cooling performance.
Innovation Solution
An engine water jacket is designed with a ceiling extending obliquely relative to the boat's longitudinal direction and a water drain positioned at the highest portion to efficiently discharge cooling water and guide air upward, preventing air accumulation and enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a horizontal ceiling is used in the water jacket, then the structure is simple and easy to manufacture, but air accumulates in the water jacket reducing cooling efficiency
Solution Approach 1:
The patent applies asymmetry by changing the ceiling from a horizontal symmetric design to an oblique asymmetric design. The ceiling extends from the front surface toward the rear surface at an angle, creating a sloped surface that prevents air accumulation. This asymmetric geometry allows air to be naturally directed toward the water discharge, eliminating air pockets that would otherwise form with a horizontal ceiling, while maintaining manufacturing simplicity.
2Productivity
If water flows through the water jacket during rapid acceleration and turning, then cooling function is provided, but air mixes with water and enters the water jacket reducing cooling performance
Solution Approach 1:
The patent introduces a dimensional change by transitioning from a horizontal ceiling to an oblique ceiling that extends in the longitudinal direction of the boat. This adds a longitudinal dimension to the ceiling geometry, creating a sloped surface that utilizes the direction of water flow to prevent air mixing. The oblique orientation aligns with the water flow direction during acceleration and turning, allowing air to be naturally excluded from the water jacket while maintaining effective 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 oblique ceiling and water drain configuration effectively prevent air from entering and accumulating in the water jacket, maintaining cooling efficiency even during varying hull orientations, ensuring consistent engine cooling performance.
Implementation Method 1
a water drain provided adjacent to the highest portion of the water jacket to discharge the cooling water out of the water jacket
Data Source
AI summary
An engine for a planing-type boat can have a water jacket, which is provided in a main body of the engine and which is supplied with cooling water for cooling the engine. The water jacket can include a ceiling with its rearward portion higher than its forward portion. The water jacket can also include a water drain provided at the rear highest portion of the ceiling to discharge cooling water out of the water jacket. In addition, a head bolt fastening portion for receiving a bolt is provided on an outer side portion of the water jacket in the cylinder head, and a rib is provided in a portion of the water jacket that corresponds to the head bolt fastening portion.