Marine Drive Rigging Access via Segmented Cowl and Hidden Fasteners
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Solution Overview
Problem
Existing marine drives often lack sufficient space for manual access to rigging components, especially between the powerhead and interior cowling surfaces, and existing solutions compromise water resistance and aesthetics.
Innovation Solution
A marine drive design featuring a rigging opening in the laterally facing surface of the lower cowl portion, accessible even when the upper cowl is closed, with a removable access door that provides a water-tight seal and is aesthetically concealed, using a gasket seal and hidden fasteners to maintain water resistance and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rigging opening is provided in the lower cowl portion for manual access to rigging connectors, then ease of operation is improved, but water resistance deteriorates
Solution Approach 1:
The cowl is divided into multiple portions (upper cowl portion and lower cowl portion) with the rigging opening located in the lower portion. This segmentation allows the opening to be positioned in a location that provides manual access while maintaining the overall water resistance of the engine enclosure.
Solution Approach 2:
A removable access door is introduced as an intermediary element that covers the rigging opening when not in use. This access door acts as a mediator between the need for manual access and the requirement for water resistance, allowing operators to open it temporarily for rigging operations and close it to restore water protection.
2Reliability
If a removable access door is added to cover the rigging opening, then water resistance is improved, but device complexity increases
Solution Approach 1:
The access door is designed as a separate, removable component that can be independently attached and detached from the lower cowl portion. This segmentation allows the door to be added only where needed to cover the rigging opening, rather than requiring a complete redesign of the entire cowl structure.
Solution Approach 2:
The access door is designed to be removable rather than fixed, allowing it to be dynamically installed or removed based on operational needs. This dynamic approach provides water resistance when installed while avoiding permanent structural complexity in the cowl design.
3Ease of operation
If the rigging opening is made accessible when the upper cowl is closed, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The cowl is segmented into upper and lower portions that can be independently positioned. The rigging opening is specifically located in the lower cowl portion, which can be accessed and operated on independently of the upper cowl's position, reducing the precision requirements for overall alignment.
Solution Approach 2:
The rigging opening is positioned on the laterally facing surface of the lower cowl portion, creating a different access dimension. This lateral positioning allows operators to access rigging connectors from the side rather than requiring top-down access through the upper cowl, thereby reducing alignment precision requirements between cowl portions.
Data Source
AI summary
A marine drive includes an engine; a cowl having first and second cowl portions. The first cowl portion is movable with respect to the second cowl portion into an open position in which the engine is manually accessible and a closed position in which the engine is enclosed; and a rigging port in the second cowl portion. The rigging port provides a passageway for rigging connectors extending from the engine to a component located remotely from the engine. A rigging opening provides manual access to the rigging connectors and the engine, including when the first cowl portion is in the closed position. A removable access door covers the rigging opening and prevents manual access to the engine and rigging connectors via the rigging opening. The removable access door is fastened to the second cowl portion by a removable fastener that is hidden from view.