Stern Drive Mounting Assembly for Transom Vibration Isolation
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Solution Overview
Problem
Existing marine propulsion systems face challenges in effectively isolating vibrations between the drive assembly and the transom of a marine vessel, leading to potential noise and vibration issues.
Innovation Solution
A stern drive system featuring a vibration dampening member, such as a monolithic annular ring, is integrated between a rigid mounting ring and plate to isolate vibrations, with the powerhead aligned with the transom's center of gravity, allowing for a balanced and vibration-reduced operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid mounting system is used to secure the drive assembly to the transom, then the structural strength and stability are improved, but vibration and noise transmission increase
Solution Approach 1:
The patent introduces a vibration dampening member as an intermediary element positioned between the rigid mounting system and the drive assembly. This mediator absorbs and dissipates vibrations while allowing the rigid mounting structure to maintain its structural strength, thus resolving the contradiction between strength and vibration reduction
Solution Approach 2:
The mounting system employs composite construction by combining rigid mounting components with vibration dampening materials. This creates a hybrid structure that leverages the strength of rigid materials while incorporating the vibration-absorbing properties of dampening materials, simultaneously achieving both structural integrity and vibration reduction
2Reliability
If the drive assembly is securely mounted to the transom, then the reliability of propulsion is improved, but vibration isolation becomes more difficult
Solution Approach 1:
The vibration dampening member serves as a mediator that maintains the reliable connection between the drive assembly and transom while filtering out harmful vibrations. It ensures propulsion reliability through secure mounting while protecting the transom from vibration transmission
3Object-generated harmful factors
If vibration dampening measures are added to the mounting system, then noise and vibration are reduced, but device complexity increases
Solution Approach 1:
The patent merges the vibration dampening function with the existing mounting structure by integrating dampening members into the mounting assembly. This combination approach reduces noise and vibration while avoiding the need for entirely separate vibration control systems, thereby limiting the increase in device 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 system effectively reduces vibrations and noise by aligning the stern drive's center of gravity with the transom, enhancing operational stability and reducing noise production.
Implementation Method 1
The mounting assembly includes a vibration dampening member which isolates vibrations of the drive assembly and the powerhead relative to the transom
Data Source
AI summary
A stern drive for a marine vessel, the stern drive having a drive assembly configured to generate a thrust force in water, a powerhead configured to power the drive assembly, and a mounting assembly configured to couple the drive assembly to the transom outside of the marine vessel and to suspend the powerhead on the transom inside of the marine vessel. The mounting assembly has a vibration dampening member which isolates vibrations of the drive assembly and the powerhead relative to the transom. The powerhead, and the mounting assembly are installed on the marine vessel as a single component from outside the transom.