Marine Propulsion Unit Planetary Gear Torque Amplification
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Solution Overview
Problem
Prior art marine vessel propulsion units, such as outboard motors, fail to transmit a large torque to the propeller during ordinary running, limiting the vessel's speed and efficiency.
Innovation Solution
A marine vessel propulsion unit with a planetary gear mechanism that decelerates and amplifies torque by inputting rotation from the drive shaft into the ring gear, with a sun gear fixed in a non-rotating state, allowing the carrier to output a decelerated and amplified rotation to the propeller shaft, and includes a clutch for switching the propeller shaft's rotation direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the planetary gear mechanism is used to transmit driving force from the drive shaft to the propeller shaft, then torque is amplified and a large torque is transmitted to the propeller, but the device complexity increases and the outer diameter of the propulsion unit is enlarged
Solution Approach 1:
The planetary gear mechanism is configured to be selectively engageable and disengageable based on operating conditions. The control mechanism dynamically switches between engaged and disengaged states, allowing the system to adapt its complexity to the actual torque requirements, thereby reducing unnecessary mechanical complexity during normal operation while providing torque amplification when needed.
Solution Approach 2:
The planetary gear mechanism serves multiple functions: it acts as both a torque amplification device and a structural support element. The mechanism is designed to provide torque multiplication during low-speed operation while maintaining a compact configuration that does not significantly increase the overall outer diameter of the propulsion unit.
2Force
If the planetary gear mechanism is engaged for torque amplification, then a large torque is transmitted to the propeller for high-speed driving, but the mechanism cannot be readily disengaged to allow direct drive for ordinary running
Solution Approach 1:
The control mechanism dynamically switches between engaged and disengaged states based on operating conditions. During low-speed operation or when high torque is required, the planetary gear mechanism is engaged to provide torque amplification. During ordinary running at normal speeds, the mechanism is disengaged to allow direct drive from the drive shaft to the propeller shaft, enabling easy transition between operating modes.
Solution Approach 2:
The system automatically selects the appropriate drive mode based on operational requirements. The control mechanism monitors operating conditions and autonomously engages or disengages the planetary gear mechanism without requiring manual intervention, allowing the system to self-optimize its performance for different operating scenarios.
3Force
If the planetary gear mechanism is used to amplify torque during ordinary running, then the propeller receives sufficient torque for high-speed driving, but the propulsion unit's outer diameter is enlarged
Solution Approach 1:
The planetary gear mechanism is configured to be selectively engageable and disengageable based on operating conditions. The control mechanism dynamically switches between engaged and disengaged states, allowing the system to adapt its complexity to the actual torque requirements, thereby reducing unnecessary mechanical complexity during normal operation while providing torque amplification when needed.
Solution Approach 2:
The planetary gear mechanism is compactly integrated into the existing propulsion unit structure. The mechanism utilizes the radial space around the drive shaft and propeller shaft, nesting the planetary gears within the existing mechanical envelope. This nested configuration provides torque amplification functionality without significantly increasing the overall outer diameter of the propulsion unit.
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
Enables the transmission of a large torque to the propeller during high-speed forward driving and increased forward drive speed, while preventing enlargement of the propulsion unit's outer diameter and allowing efficient switching between forward and reverse drive directions.
Implementation Method 1
The planetary gear mechanism is arranged to decelerate a rotation from the drive shaft and transmit a decelerated rotation toward the propeller shaft
Implementation Method 2
the planetary gear mechanism amplifies the input torque and outputs an amplified torque
Data Source
AI summary
A marine vessel propulsion unit includes an engine, a drive shaft, a single propeller shaft, a single propeller, and a planetary gear mechanism. The drive shaft is arranged to extend vertically. The propeller shaft is arranged to extend in a direction intersecting the drive shaft. The rotation of the engine is transmitted to the propeller shaft via the drive shaft. The propeller is arranged to rotate together with the propeller shaft. The planetary gear mechanism is arranged at the front relative to the drive shaft and coaxial to a central rotation axis of the propeller shaft. The planetary gear mechanism is arranged to decelerate the rotation from the drive shaft and transmit the decelerated rotation toward the propeller shaft.