Outboard Motor Case Segmentation for Manufacturing
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Solution Overview
Problem
Conventional outboard motors face challenges in manufacturing cases with complex or large configurations due to the limitations of casting, which can result in increased weight and difficulty in achieving sufficient mechanical strength.
Innovation Solution
The outboard motor design features a case composed of multiple separate parts that are assembled together, eliminating the need for flanges and allowing for easier manufacturing of complicated or large configurations while maintaining mechanical strength, using materials like die-cast aluminum and heat-treated aluminum for different parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the case is manufactured by casting as a single part, then the mechanical strength is sufficient, but it is difficult to manufacture cases with complicated or large configurations
Solution Approach 1:
The case is divided into multiple separate case parts that are assembled together to form the complete case structure. This segmentation allows each individual case part to be manufactured more easily by casting, while the assembled configuration achieves the required complicated or large-scale design. The case parts are connected through engagement structures without requiring flanges, thus avoiding weight increase while enabling complex configurations.
2Ease of manufacture
If the case is divided into multiple case parts for easier manufacturing, then the ease of manufacture is improved, but flanges are needed for assembly which increases weight
Solution Approach 1:
The case is segmented into multiple case parts that can be manufactured separately and assembled together. This segmentation enables easier manufacturing of each individual part while achieving the required complex or large configuration when assembled.
Solution Approach 2:
Instead of using conventional flange-based connection methods that increase weight, the invention inverts the approach by using engagement structures where case parts fit together without flanges. The case parts are designed to engage directly with each other, eliminating the need for additional flange components and thus preventing weight increase while still enabling assembly of multiple parts.
3Strength
If a single large case part is used, then the mechanical strength is sufficient, but it is difficult to manufacture with complicated configurations
Solution Approach 1:
The case structure is divided into multiple case parts that are assembled together to form the complete case. This segmentation allows each individual case part to be manufactured more easily, particularly when the overall configuration is complicated or large-scale. The engagement structures between case parts ensure proper alignment and structural integrity.
Solution Approach 2:
Multiple separately manufactured case parts are merged together through engagement structures to form the complete case assembly. This combining approach allows each part to be optimized for easier manufacturing while the assembled structure achieves the required mechanical strength and complex configuration.
Data Source
AI summary
An outboard motor includes an upper case located between an engine and a propulsion unit. The upper case includes case parts that are separate from each other and assembled together. The case parts include a first case part and a second case part opposing each other in a direction perpendicular or substantially perpendicular to an axis of a drive shaft.