Outboard Engine Propulsion Assembly with Two-Dimensional Translation
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Solution Overview
Problem
Current outboard engine systems face inefficiencies due to limited vertical translation range and non-uniform water flow patterns, leading to suboptimal thrust adjustment and potential cavitation, with existing solutions complicating calibration and control.
Innovation Solution
A mechanical propulsion assembly that allows the outboard engine to translate vertically and horizontally, optimizing propeller position relative to the hull and water surface, using a combination of displacement actuators and a control unit to adjust the engine's position for maximum performance, including a four-bar linkage system for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the engine is translated vertically using jack-plates, then the propeller position relative to the water surface is improved, but the vertical translation range is limited by cavitation risk
Solution Approach 1:
The patent transitions from single-vertical-dimension adjustment (jack-plates) to two-dimensional adjustment by adding longitudinal translation capability. The engine can now move both vertically and longitudinally relative to the transom, allowing optimization of propeller position in both dimensions to avoid cavitation while maintaining thrust efficiency.
2Adaptability or versatility
If multiple actuators are used to translate the engine in multiple directions, then the engine position flexibility is improved, but the system complexity and control difficulty increase
Solution Approach 1:
The patent merges multiple adjustment functions (vertical translation and longitudinal translation) into a coordinated system where actuators work together through a control unit. Rather than treating each degree of freedom independently, the system integrates control of multiple actuators to achieve combined positional adjustment, reducing overall system complexity.
Solution Approach 2:
The control unit receives signals from actuators and coordinates their operation based on desired engine position. This feedback mechanism allows the system to manage multiple actuators efficiently, adjusting engine position in both vertical and longitudinal directions while maintaining simple control logic.
3Strength
If the engine is positioned closer to the transom, then the structural support is improved, but the water flow uniformity over the propeller decreases
Solution Approach 1:
The patent transforms the engine mounting from a fixed static position to a dynamic adjustable position. The engine can be relocated longitudinally and vertically using actuators, allowing the system to adapt to different water flow conditions and operational requirements, thereby achieving both structural support and optimal water flow uniformity.
Data Source
AI summary
Combination of boat and outboard engine, in which at least one outboard engine is fastened to the transom of the boat in a prearranged position, the engine being mounted to translate along a path with at least one motion component having a vertical orientation in a direction away from or close to the waterline of the boat, that is, of smaller or greater propeller draft, and a motion component having a horizontal or longitudinal orientation in a direction away from or close to the transom of the boat.