Propeller Nut with Elastomeric Damping for Tool-Free Marine Installation
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Solution Overview
Problem
Existing propeller securing nuts require external tools for application and fail to effectively dampen noise, heat, and vibrations in marine engines, leading to maintenance challenges and noise pollution.
Innovation Solution
A propeller nut with an exterior portion featuring topographical features for manual gripping and a shaft portion with elastomeric materials that absorb and release heat and noise, allowing for secure, tool-free installation and reducing noise and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional propeller securing nuts are used, then the propeller can be secured to the drive shaft, but external tools such as wrenches are required for installation and removal
Solution Approach 1:
The shaft portion is nested within the exterior portion of the nut, creating a multi-layered structure where the shaft portion with elastomeric material is contained within the broader exterior portion. This nesting allows the nut to integrate multiple functions (securing, damping, sealing) within a single component that can be manually operated
Solution Approach 2:
The nut combines rigid metallic portions (exterior portion and shaft) with elastomeric materials (propeller engaging portion) to create a composite structure. This composite design provides both the structural integrity needed for securing and the damping properties needed for vibration and noise reduction, while enabling manual gripping and operation
2Object-affected harmful factors
If conventional propeller nuts are used, then the propeller is secured, but noise, vibrations, and heat are not effectively dampened
Solution Approach 1:
Different portions of the nut have different material properties tailored to specific functions: the elastomeric propeller engaging portion provides vibration and noise damping where contact with the propeller occurs, while the rigid exterior portion provides structural strength for securing. This localized differentiation of material qualities addresses the damping requirement without requiring the entire nut to be complex
Solution Approach 2:
The combination of rigid metal and elastomeric materials creates a composite structure that simultaneously provides structural integrity and damping properties. The elastomeric material specifically targets noise and vibration dampening at the propeller interface, while the overall composite design manages heat transfer through the combination of materials with different thermal properties
3Temperature
If traditional securing methods are used, then the propeller is attached, but heat generated during operation is not managed
Solution Approach 1:
The composite structure combining rigid metal and elastomeric materials creates pathways for heat dissipation. The elastomeric material, with its different thermal conductivity, helps manage heat transfer between the propeller and the nut structure, while the overall design allows heat to be distributed and dissipated rather than concentrated in one location
4Reliability
If simple nut designs are used, then manufacturing is easier, but waterproofing and sealing capabilities are insufficient
Solution Approach 1:
The elastomeric propeller engaging portion is specifically designed to interface with the propeller assembly in a manner that creates waterproofing and sealing. This localized sealing capability at the critical interface provides reliable waterproofing without requiring complex sealing mechanisms throughout the entire nut structure
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 solution enables user-friendly, tool-free installation and effective noise and heat management, reducing maintenance needs and noise pollution while providing a tactical advantage in stealthy marine operations.
Implementation Method 1
the elastomeric material engages against a cup-like chamber of the propeller assembly so that the nut absorbs and releases the resulting heat and noise emanating from the propeller assembly
Implementation Method 2
the elastomeric material engages against a cup-like chamber of the propeller assembly so that the nut absorbs and releases the resulting heat and noise emanating from the propeller assembly
Data Source
AI summary
The invention comprises an improved nut for securing a propeller to a drive shaft of a vehicle engine. The invention further comprises a nut that may be securely fastened to the end of the drive shaft of a trolling motor engine without the use of separate tools, such as wrenches or drivers. The invention even further comprises a nut with an exterior portion and a shaft portion that communicates along an axis of the drive shaft of a marine engine against the propeller assembly, the shaft portion having elastomeric materials to interface with the propeller assembly and at least one channel which together absorb vibration, heat and sound from the propeller assembly.