Outboard Motor Tilt Shaft Layout for Greater Trim-In Angle
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Solution Overview
Problem
Conventional outboard motors with internal combustion engines face limitations in trim-in due to lubricating oil combustion issues and interference with the hull, while those with electric motors struggle to achieve significant trim-in without interfering with the hull, limiting their posture control and propulsion efficiency.
Innovation Solution
The outboard motor design incorporates an electric motor with a tilt shaft positioned closer to the lower end of the stern, allowing for a greater trim-in angle by minimizing interference with the hull, and includes a lift mechanism for enhanced tilt-up, enabling angles up to 30° or more without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the tilt shaft is positioned in the vicinity of the upper portion of the outboard motor main body to enable great tilt-up, then the upper portion can be lifted out of water effectively, but the lower portion moves forward by a large amount during trim-in and interferes with the hull
Solution Approach 1:
The patent repositions the tilt shaft from a horizontal arrangement to a vertical arrangement, changing the dimension of rotation. This allows the outboard motor main body to rotate about a vertical axis, enabling independent control of tilt-up and trim-in movements without the coupling effects present in conventional horizontal tilt shaft designs.
Solution Approach 2:
The patent separates the tilt-up and trim-in functions into independent rotational movements about different axes. The tilt shaft enables tilt-up rotation about a vertical axis, while the trim mechanism independently controls trim-in, allowing each function to be optimized without compromising the other.
2Adaptability or versatility
If the outboard motor main body is trimmed in to a great extent to improve posture control, then the degree of freedom in posture control increases, but lubricating oil is burned in the fuel chamber causing white smoke
Solution Approach 1:
The patent replaces the reciprocating internal combustion engine with an electric motor, eliminating the mechanical combustion process that causes lubricating oil to burn and produce white smoke. This substitution allows unlimited trim-in capability without the harmful effects of oil combustion.
3Ease of operation
If the tilt shaft is positioned closer to the lower end of the stern to reduce forward movement of the lower portion during trim-in, then the amount of trim-in can be increased, but the upper portion may interfere with the hull during tilt-up
Solution Approach 1:
By changing the tilt shaft orientation to vertical, the patent decouples the horizontal and vertical movements, allowing the lower portion to move forward during trim-in without restricting the upper portion's ability to move upward during tilt-up. The vertical rotation axis allows independent control of both movements.
Data Source
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Figure 3A~3C
AI summary
An outboard motor includes a main body with a power source therein and a bracket to be attached to a stern of a hull. The main body rotates about a rotating shaft of the bracket, such that an upper portion of the main body moves toward the front of a marine vessel and a lower portion of the main body moves toward the rear of the marine vessel, or such that the upper portion of the main body moves toward the rear of the marine vessel and the lower portion of the main body moves toward the front of the marine vessel. In the hull on sailing, the distance from the rotating shaft to the upper end of the stern is equal to or longer than the distance from the rotating shaft to a propeller shaft, with respect to the vertical direction of the marine vessel.