Boat Propulsion Bevel Gear Elastic Buffer for Noise Reduction
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Solution Overview
Problem
Conventional boat propulsion systems experience variations in thrust force due to engine rotational speed and torque changes, leading to unwanted sound and vibration, particularly noticeable in four-cycle engines.
Innovation Solution
Incorporating an elastic member, such as a disc spring and shim member, between the propeller shaft and bevel gear to absorb and mitigate the impact of thrust force variations, thereby reducing vibration and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an elastic member is added between the propeller shaft and bevel gear to absorb thrust force variations, then sound and vibration are reduced, but device complexity increases
Solution Approach 1:
An elastic member is introduced as an intermediary component between the propeller shaft and the bevel gear. This elastic member absorbs thrust force variations through elastic deformation, preventing direct transmission of impact forces to the propeller shaft. The intermediary element isolates the harmful vibrations and sounds while maintaining the functional connection between components.
Solution Approach 2:
The elastic member is pre-installed between the propeller shaft and bevel gear to provide beforehand cushioning against thrust force variations. By positioning the elastic cushioning element in advance, the system is prepared to absorb impact forces before they can cause harmful vibrations and sounds, rather than adding complex active control systems.
2Power
If the propeller shaft directly contacts the bevel gear to transmit power efficiently, then power transmission is improved, but impact and sound are generated due to thrust force variations
Solution Approach 1:
The elastic member serves as a mediator that maintains the power transmission connection between the bevel gear and propeller shaft while filtering out harmful impact forces. The elastic deformation of this intermediary component allows continuous power transmission while absorbing thrust force variations that would otherwise generate noise and vibration.
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 elastic member effectively minimizes and prevents the generation of impact and sound caused by thrust force variations, enhancing user comfort by reducing vibrations and noise levels.
Implementation Method 1
the forwarding side buffer member includes at least an elastic member that is arranged to be elastically deformed between the propeller shaft and the forwarding bevel gear as a component member
Data Source
AI summary
A boat propulsion system includes a drive bevel gear fixed on a lower end of a drive shaft, a forwarding bevel gear and a reversing bevel gear rotatably fitted on a propeller shaft and meshing together with the drive bevel gear, and a dog clutch mounted on the propeller shaft and rotatable with the propeller shaft, moves in an axial direction of the propeller shaft, and meshes together with the forwarding bevel gear or the reversing bevel gear to rotate the propeller shaft, in which the propeller shaft comes in contact with the forwarding bevel gear via a forwarding side buffer member having a disc spring as a component member. The boat propulsion system prevents and minimizes sound and impact even when variations in thrust force occur.