Symmetrical Vessel Drive Device with Galvanic Isolation
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Solution Overview
Problem
Existing drive devices for non-electrical vessels, such as sailboats and historical vessels, face challenges in propulsion efficiency and compatibility with various vessel structures, including galvanic corrosion issues in seawater environments.
Innovation Solution
A modular drive device with a detachable propeller and symmetrical connection devices for mounting on masts or keels, incorporating an electric motor, gear system, and azimuth operation, along with a tilt mechanism and galvanic isolation to address corrosion and versatility needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a non-modular drive device is used, then the structure is simpler, but the compatibility with various vessel structures is reduced
Solution Approach 1:
The drive device is divided into modular components including a drive unit, connection device, and propeller assembly that can be independently configured and attached to different vessel structures such as masts, keels, or transoms, enabling compatibility across various vessel types without requiring a completely different drive system design
Solution Approach 2:
The connection device is designed with universal mounting capabilities that allow the same drive unit to be installed on multiple vessel structure types (masts, keels, transoms) through standardized interface mechanisms, achieving multi-functionality and broad adaptability with a single device design
2Reliability
If galvanic isolation is not implemented, then the device complexity is reduced, but galvanic corrosion occurs in seawater environments
Solution Approach 1:
Galvanic isolation components serve as intermediary elements between dissimilar metal parts in contact with seawater, using non-conductive materials or isolation layers to prevent direct galvanic coupling while maintaining structural integrity and mechanical connection functionality
Solution Approach 2:
The drive device incorporates composite material construction combining conductive and non-conductive materials in a single structure, such as composite housing or isolation layers integrated into metal components, providing both mechanical strength and galvanic corrosion protection simultaneously
3Ease of repair
If the propeller is permanently mounted, then the device complexity is reduced, but the ease of repair and replacement is worsened
Solution Approach 1:
The propeller mounting system transitions from a fixed permanent connection to a dynamic detachable connection that allows the propeller to be easily removed and reattached, providing operational flexibility for maintenance and replacement while maintaining secure attachment during operation through standardized fastening mechanisms
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 provides efficient propulsion, modular compatibility with different vessel configurations, and protection against galvanic corrosion, enhancing the operational reliability and adaptability of non-electrical vessel drive systems.
Implementation Method 1
The drive device comprises an electric motor, driving a rotatable drive shaft
Implementation Method 2
incorporating an electric motor, gear system, and azimuth operation, along with a tilt mechanism and galvanic isolation to address corrosion and versatility needs
Data Source
AI summary
A drive device for a vessel includes an electric motor, driving a rotatable drive shaft; an elongate drive device housing, encapsulating the electric motor and the drive shaft; and a propeller, detachably mounted to the rotatable drive shaft. The drive device housing has an upper connection device. The upper connection device is symmetrical about a transverse axis, enabling the drive device housing to be mounted to a structure onboard the vessel in either of two longitudinal directions. The drive device and the hull of the vessel are separated from each other by using an isolation plate with a central isolation sleeve. The electric motor drives the drive shaft via an interconnected gear device encapsulated in the drive device housing or integrated as a part of the drive device housing and are arranged pivotably with respect to the tilt device housing.