Sterndrive Coupler Rebuildable Shaft and Damper Assembly
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Solution Overview
Problem
Current sterndrive couplers are not repairable, prone to premature failure due to worn-out splines and failure of rubber dampening materials, leading to costly replacements and potential loss of propulsion, with limited torque capacity and lack of field serviceability.
Innovation Solution
A field-serviceable and 100% rebuildable coupler using a splined chromoly center shaft and polyurethane dampening material, with an external indicator for wear assessment, allowing for replacement of worn components without needing a full coupler replacement, and capable of handling higher torque loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welded construction is used for sterndrive coupler, then structural strength is improved, but repairability deteriorates
Solution Approach 1:
The coupler is divided into separate modular components including a drive coupling housing, a drive shaft, and a dampening element that can be independently replaced. This segmentation allows the dampening element to be replaced without replacing the entire coupler assembly, resolving the contradiction by maintaining structural strength through welded construction while enabling repairability through modular component replacement.
2Object-generated harmful factors
If rubber dampening material is used, then vibration dampening is improved, but reliability deteriorates due to premature failure
Solution Approach 1:
The dampening element is designed with replaceable wear plates that can be independently serviced. When the dampening material shows signs of wear or failure, only the wear plates need to be replaced rather than the entire dampening assembly. This parameter change approach maintains the vibration dampening function while significantly improving reliability by extending the overall service life of the coupler.
3Strength
If entire coupler replacement is required, then torque capacity is maintained, but cost deteriorates
Solution Approach 1:
The dampening element is extracted as a separate replaceable component from the main coupler assembly. This allows the wear-prone dampening element to be replaced independently while retaining the expensive housing and shaft components. The torque capacity is maintained through the durable housing and shaft design, while cost is reduced by replacing only the inexpensive dampening element rather than the entire coupler.
4Ease of manufacture
If OEM coupler design is used, then manufacturing simplicity is improved, but adaptability deteriorates
Solution Approach 1:
The coupler design incorporates a serviceable dampening element with replaceable wear plates that can be accessed and replaced in the field. This dynamic design feature allows the coupler to adapt to wear conditions by enabling field maintenance, transforming a previously static, non-serviceable component into one that can be maintained and extended in service life through simple field operations.
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
The solution provides a cost-effective and reliable alternative by enabling the replacement of worn parts, extending the coupler's lifespan, ensuring continuous propulsion, and maintaining high torque performance, reducing towing costs and environmental impact.
Implementation Method 1
the invention uses polyurethane dampening material which is widely used in industrial and automotive dampening applications
Implementation Method 2
As opposed to using the failure-prone rubber dampening materials, the invention uses polyurethane dampening material
Data Source
AI summary
A marine engine coupler for connecting a sterndrive input shaft to an engine flywheel. A splined central shaft connects the sterndrive input shaft to the coupling. Polyurethane dampers interface between the engine to the sterndrive to reduce vibration. There is a visual indicator on the coupler to allow the user to assess the integrity of the dampening material and give the user an indication that the dampening materials needs to be replaced.