Marine Outboard Engine Mount Axis Alignment for Vibration Damping
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Solution Overview
Problem
Existing engine mount systems for marine outboard engines are ineffective in damping vibrations due to torque-kick at low engine speeds and do not provide adequate damping over a broad range of engine speeds.
Innovation Solution
The engine mount system features working axes that pass through the steering shaft, with elastomeric dampers and strategically oriented primary and working axes to effectively absorb vibrations at various engine speeds, including those caused by torque-kick.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional engine mount configurations are used, then the structure is simple, but vibration damping effectiveness across broad speed ranges is insufficient
Solution Approach 1:
The engine mount system is designed with multi-functionality to handle diverse vibration sources. The same mount configuration with working axes passing through the steering shaft serves dual purposes: damping torque-kick vibrations at low speeds and damping piston inertia vibrations at high speeds, eliminating the need for separate mounting systems for different operating conditions.
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
This configuration significantly reduces vibrations transmitted to the tiller by minimizing the moment arm at low engine speeds and provides effective damping across a range of engine speeds, from low torque-kick to high inertia-induced vibrations.
Implementation Method 1
The engine mount system features working axes that pass through the steering shaft, with elastomeric dampers and strategically oriented primary and working axes to effectively absorb vibrations at various engine speeds
Implementation Method 2
This configuration significantly reduces vibrations transmitted to the tiller by minimizing the moment arm at low engine speeds
Data Source
AI summary
A marine outboard engine has a cowling, an engine, a driveshaft operatively connected to the crankshaft, a gear case, a transmission disposed in the gear case and connected to the driveshaft, a propeller shaft disposed generally perpendicular to the driveshaft and operatively connected to the transmission, and a bladed rotor connected to the propeller shaft. A pair of engine mounts are operatively connected to the engine. Each engine mount defines an engine mount working axis. A steering shaft is operatively pivotally connected to the engine mounts. The engine mount working axes are generally perpendicular to the steering axis and pass through the steering shaft. A stern bracket is operatively pivotally connected to the steering shaft for mounting the outboard engine to a boat. A marine outboard engine where primary axes of the engine mounts pass through the steering shaft is also disclosed.