Propeller Driving Assembly Automatic Gear Shifting
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Solution Overview
Problem
Existing multi-speed transmission systems for marine engines require complex electrical controllers and driver intervention for gear shifting, compromising fuel efficiency and acceleration performance.
Innovation Solution
A propeller driving assembly with a one-way roller sprag clutch and centrifugal release clutch that automatically shifts gears using flyweight assemblies to engage or disengage notches on a ratchet wheel, eliminating the need for complex electrical systems and driver intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multi-speed transmission is used to improve acceleration and fuel economy, then acceleration performance and fuel efficiency are improved, but the system requires complex electrical controllers and sensors
Solution Approach 1:
The patent replaces complex electrical controllers and sensors with a purely mechanical automatic shifting mechanism. The mechanism uses flyweights, notches, and cam surfaces to detect engine speed and automatically engage/disengage the roller sprag clutch at predetermined speeds, eliminating the need for electrical sensing systems while maintaining multi-speed transmission benefits
Solution Approach 2:
The transmission system performs automatic gear shifting without driver intervention. The mechanical components (flyweights, notches, cam surfaces) self-regulate the shifting process by detecting engine speed and automatically engaging or disengaging the roller sprag clutch, making the system self-managing and eliminating complex electrical control
2Productivity
If a multi-speed transmission is used to improve acceleration and fuel economy, then acceleration performance and fuel efficiency are improved, but driver intervention is required for gear switching
Solution Approach 1:
The transmission system performs automatic gear shifting without driver intervention. The mechanical components (flyweights, notches, cam surfaces) self-regulate the shifting process by detecting engine speed and automatically engaging or disengaging the roller sprag clutch, making the system self-managing and eliminating complex electrical control
3Speed
If an engine is designed for maximum speed, then high speed performance is improved, but low speed acceleration deteriorates
Solution Approach 1:
The transmission system segments the engine's operating range into two distinct gear settings (high gear and low gear). The roller sprag clutch mechanism allows the system to switch between these segments based on engine speed, enabling the engine to operate optimally in each range - high speed for maximum performance and low gear for improved low-speed acceleration
4Productivity
If an engine is designed for maximum low speed acceleration, then low speed acceleration is improved, but high speed performance deteriorates
Solution Approach 1:
The transmission system segments the engine's operating range into two distinct gear settings (high gear and low gear). The roller sprag clutch mechanism allows the system to switch between these segments based on engine speed, enabling the engine to operate optimally in each range - high speed for maximum performance and low gear for improved low-speed acceleration
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 assembly achieves automatic gear shifting, improving fuel efficiency, reducing engine wear, and providing rapid acceleration and enhanced boat control, with no driver intervention required, while using readily available components.
Implementation Method 1
a centrifugal release clutch that automatically shifts gears using flyweight assemblies to engage or disengage notches on a ratchet wheel
Implementation Method 2
a one-way roller sprag clutch having an inner race and an outer race with the outer race connected to the input shaft
Implementation Method 3
an outer shaft connected to the release clutch and the outer race, the outer shaft having a lower end connected to a first bevel gear, an inner shaft connected to the input shaft and the inner race, the inner shaft having a lower end connected to a second bevel gear
Data Source
AI summary
A propeller driving assembly connected to an input shaft that is coupled to an engine is disclosed which has a roller clutch having an inner race and an outer race with the outer race connected to the input shaft, a release clutch connected to the input shaft, the release clutch having a ratchet wheel having a notch and a flyweight assembly for engaging or disengaging the notch, an outer shaft connected to the release clutch and the outer race, the outer shaft having a lower end connected to a first bevel gear, an inner shaft connected to the input shaft and the inner race, the inner shaft having a lower end connected to a second bevel gear, and a propeller shaft connected to the first bevel gear and the second bevel gear.