Outboard Engine Cover Bracket for Independent Detachment
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Solution Overview
Problem
Conventional outboard engine units face challenges in maintaining workability due to unstable fixation of cover members during detachment and re-attachment, cumbersome sealing structures, and increased size and weight issues when performing maintenance on ignition plugs.
Innovation Solution
The outboard engine unit features a bracket system where left and right cover members are fixed at their rear portions, allowing independent detachment and re-attachment, eliminating the need for auxiliary exhaust and water pilot hole detaching, and optimizing ignition plug maintenance without altering the engine cover's lower end position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If left and right cover members are bolted together in directly-abutted relation to each other, then the cover members can be fixed together, but when one cover member is removed for maintenance work, fixation of the other cover member becomes unstable and re-assembly requires considerable time and labor
Solution Approach 1:
The invention divides the cover assembly into a fixed cover member and a removable cover member that can be detached independently. The fixed cover member remains attached to the engine body, providing stable support, while the removable cover member can be easily removed for maintenance work without affecting the fixation of the other cover member.
2Ease of operation
If sealing structure for auxiliary exhaust outlet is attached to abutting portions of cover members, then sealing is achieved, but detaching cover members requires also detaching sealing structure making operations cumbersome
Solution Approach 1:
The invention extracts the sealing structure from the abutting portions of the cover members and relocates it to the engine body. This allows the sealing function to be maintained while enabling independent detachment of the removable cover member without the need to detach the sealing structure.
3Ease of operation
If water pilot tube is supported directed by left and right cover members, then water pilot function is achieved, but detaching cover members requires also detaching water pilot tube making operations cumbersome
Solution Approach 1:
The invention extracts the water pilot tube from the support of the cover members and relocates it to be supported by the engine body. This allows the water pilot function to be maintained while enabling independent detachment of the removable cover member without the need to detach the water pilot tube.
4Ease of operation
If bottom cowling size is increased to secure sufficient space for ignition plug maintenance, then maintenance space is improved, but overall engine unit size and top cowling weight significantly increase
Solution Approach 1:
The invention utilizes the lateral dimension by offsetting the engine cylinder axis relative to the crankshaft axis, creating space on one side of the engine for ignition plug maintenance. This allows adequate maintenance space to be secured without increasing the overall size or weight of the bottom cowling and top cowling.
Data Source
AI summary
In an outboard engine unit, a cover assembly, defining a lower half section of an engine room, is composed of left and right cover members each formed of resin, and a bracket is fixed to a rear portion of the engine or engine support structure. The left and right cover members are fixed at their respective rear portions to the bracket. Centerline of an engine cylinder is offset from a centerline of the engine room toward one of left and right sides of the unit, and an ignition plug is provided on the other side opposite from the one side toward which the engine cylinder centerline is offset.