Stern Platform Arrangement with Tilting Sections for Marine Vessel Maintenance
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Solution Overview
Problem
Existing stern platform arrangements on marine vessels face challenges such as space constraints for drive units, corrosion from saline water in cooling systems, vibration issues, and difficulty in accessing the stern drive for maintenance due to the placement of the swim platform extending aft of the transom.
Innovation Solution
A stern platform arrangement featuring a propulsion unit with an outdrive system that pivots relative to the vessel, allowing for tilting and folding of platform sections to accommodate the propulsion unit, eliminating the need for an inboard drive unit and providing easy access for maintenance, while also serving as a seating unit when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stern drive with inboard drive unit is mounted within the hull, then propulsion function is achieved, but space requirements increase and access for maintenance becomes difficult
Solution Approach 1:
The inboard drive unit is extracted from the hull and relocated to an outboard motor mounted on the stern platform. This separates the propulsion function from the hull structure, eliminating the need for internal space allocation and providing external accessibility for maintenance operations.
Solution Approach 2:
The stern platform is designed with pivot joints that allow it to tilt between a horizontal drive position and an inclined maintenance position. This dynamic positioning enables easy access to the stern drive components while maintaining proper operational alignment with the propeller.
2Temperature
If a cooling system using saline water is implemented, then heat removal from drive unit is achieved, but corrosion problems occur
Solution Approach 1:
The drive unit is relocated to an outboard motor positioned externally on the stern platform, allowing the cooling system to draw from and discharge to the marine environment without requiring penetrations through the hull. This eliminates the corrosion risk associated with sealed cooling systems that must maintain pressure differentials across hull boundaries.
3Power
If transmission shafts pass through the transom, then power transmission to stern drive is achieved, but water leakage risks increase
Solution Approach 1:
The transmission system is reconfigured so that power is transmitted to the outboard motor through the platform structure rather than through shafts penetrating the hull transom. This eliminates the need for complex sealing arrangements and removes the vulnerability to water leakage associated with rotary shafts passing through the pressure boundary.
4Object-affected harmful factors
If vibration isolation components are added to the hull, then vibration from drive unit is reduced, but device complexity increases
Solution Approach 1:
The drive unit is moved from an integrated hull-mounted configuration to an external outboard motor mounted on the stern platform. This physical separation naturally isolates vibration sources from the hull structure, eliminating the need for additional vibration dampers and isolation components within the vessel.
5Ease of operation
If platform sections are made foldable with pivot joints, then access to propulsion unit is improved, but structural complexity increases
Solution Approach 1:
The stern platform incorporates pivot joints at strategic locations that enable controlled tilting between operational and maintenance positions. This dynamic structure provides easy access to the outboard motor while maintaining structural integrity during both drive and tilted configurations.
Solution Approach 2:
The foldable platform sections serve dual functions: providing a stable working surface during propulsion operation and enabling access to the stern drive when tilted. The same structural components support both the operational platform and the maintenance access function.
Data Source
AI summary
The invention relates to a platform arrangement (110) mounted to a stern portion of a marine vessel (100). The platform arrangement comprises at least one first platform section (111) with a first transverse pivot joint (113) mounted adjacent a transom (105); at least one propulsion unit (101) mounted to a lower surface of the first platform section (111), wherein the at least one propulsion unit (101) and its first platform section (111) are tiltable between a drive position and an upwards tilted position. A second platform section (112) is located in front of the at least one first platform section (111), which second platform section (112) has a second transverse pivot joint (114) mounted adjoining the first transverse pivot joint (113) of a corresponding first platform section (111). The first and second platform sections (112) are foldable relative to each other about their respective first and second pivot joints (113; 114). The invention further relates to a vessel comprising the platform arrangement.