Marine Drive Cowl Hinge Assembly Tool-Free Removal

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Solution Overview

Problem

Existing marine drive cowling systems require tools for removing the second cowl portion, limiting manual access and ease of servicing.

Innovation Solution

A hinge assembly with a first base frame attached to the interior of the first cowl portion and a second base frame attached to the interior of the second cowl portion, pivotally coupled through an intermediate frame, allowing manual removal and reattachment of the second base frame without tools, facilitated by a clevis device and detent mechanism, and assisted by a gas spring for easy opening and closing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional cowl removal methods are used, then secure attachment is maintained, but tool requirement and complexity increase

Engineering Contradiction:

ImproveEase of cowl removalVSAvoidAttachment mechanism complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The cowl system enables self-service removal and reattachment by the user without requiring external tools. The second cowl portion is designed with built-in engagement features that interact with the first cowl portion to allow tool-free manual operation, making the system serve itself for maintenance purposes

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The cowl is divided into multiple portions (first cowl portion and second cowl portion) that can be independently manipulated. The second cowl portion can be selectively removed from the first cowl portion, creating segmented functionality that allows easy access to internal components without removing the entire cowl assembly

Inventive Principle:

Principle #1Segmentation

2Ease of repair

If manual removal without tools is enabled, then ease of servicing improves, but attachment security may be compromised

Engineering Contradiction:

ImproveEase of cowl servicingVSAvoidAttachment reliability

Core Design Contradiction:

Ease of repairVSReliability

Solution Approach 1:

An intermediate engagement mechanism serves as a mediator between the first and second cowl portions. This intermediate structure provides both the manual release capability for easy servicing and the secure engagement for reliable attachment, bridging the gap between ease of repair and attachment reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The attachment system incorporates dynamic engagement features that can transition between locked and unlocked states. The engagement mechanism allows the second cowl portion to be securely attached during operation but can be easily detached when needed, providing dynamic adaptability between security and accessibility requirements

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If hinge assembly allows free pivoting, then ease of opening improves, but stability and rattling increase

Engineering Contradiction:

ImproveEase of cowl openingVSAvoidCowl stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The hinge assembly incorporates cushioning elements that preemptively reduce impacts and vibrations during cowl operation. These cushioning features are built into the hinge mechanism to absorb shocks and prevent rattling before they occur, maintaining stability while allowing free pivoting motion

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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

Enables manual removal and reattachment of the second cowl portion without tools, enhancing accessibility and ease of servicing while maintaining secure closure, reducing rattling and improving user experience.

Implementation Method 1

Methodology Applied

Scientific EffectGas spring: Spring

Data Source

PatentUS12116097B1Cowlings and hinge assemblies for cowlings on marine drives

Publication Date: 2024.10.15 BRUNSWICK CORP

AI summary

A hinge assembly is for a cowling on a marine drive. The cowling has a first cowl portion and a second cowl portion which together enclose a cowl interior. The hinge assembly has a first base frame configured for fixed attachment to an interior surface of the first cowl portion and a second base frame configured for fixed attachment to an interior surface of the second cowl portion. The second base frame is pivotally coupled to the first base frame by a connection device that enables manual removal of the second base frame from the intermediate frame without use of a tool, thus facilitating manual removal of the second cowl portion from the first cowl portion without the use of the tool.