Stern Drive Transom Bracket Vibration Isolation
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Solution Overview
Problem
Existing stern drive systems for marine vessels face challenges in effectively isolating vibrations between the drive unit, powerhead, and the transom, leading to potential noise, wear, and reduced performance.
Innovation Solution
A transom bracket assembly is designed to vibrationally isolate the drive unit and powerhead relative to the transom, featuring an outer vibration dampener and an inner vibration dampener, which are configured to support the drive unit and powerhead externally and internally, respectively, while preventing water intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stern drive system is directly mounted to the transom, then structural support and stability are improved, but vibration transfer and noise increase
Solution Approach 1:
The patent introduces vibration dampeners as intermediary elements between the stern drive components (drive unit and powerhead) and the transom. These dampeners serve as mediators that physically connect the components while absorbing and isolating vibrations, preventing direct transmission to the transom structure.
Solution Approach 2:
The patent extracts the vibration isolation function from the direct mounting structure by separating the support function (handled by the dampeners) from the structural attachment function (handled by the transom bracket assembly). This allows independent optimization of both support and vibration isolation.
2Object-generated harmful factors
If vibration isolation components are added to the stern drive system, then vibration transfer is reduced, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the transom bracket assembly, which simultaneously provides structural support, mounting attachment, and integration points for vibration dampeners. The outer and inner clamp brackets are combined with the transom housing to create an integrated assembly that reduces the number of separate components.
Solution Approach 2:
The patent employs a nested configuration where the inner vibration dampener is positioned within the space defined by the outer vibration dampener and transom bracket assembly. This nested arrangement allows multiple isolation stages to coexist in a compact configuration, minimizing space requirements and overall system complexity.
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 transom bracket assembly effectively reduces vibration transfer from the stern drive to the marine vessel, enhancing operational quietness, reducing wear, and improving overall performance by isolating vibrations through the use of dual vibration dampeners.
Implementation Method 1
a transom bracket assembly configured to support the drive unit outside of the transom and further configured to support the powerhead inside of the transom, wherein the transom bracket assembly is configured to vibrationally isolate the drive unit and the powerhead relative to the transom
Implementation Method 2
an elastomeric spacer between the outer shell and the inner wedge
Data Source
AI summary
A stern drive for a marine vessel having a transom. The stern drive has a drive assembly comprising a drive unit configured to generate a thrust force in water and a powerhead configured to power the drive unit, and a transom bracket assembly configured to support the drive unit outside of the transom and further configured to support the powerhead inside of the transom, wherein the transom bracket assembly is configured to vibrationally isolate the drive unit and powerhead relative to the transom.