Outboard Motor Damper Segmentation for Vibration and Stability
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Solution Overview
Problem
Outboard motor control stability decreases due to increased flexibility of damper members, leading to delayed rudder angle response and reduced maneuverability, especially during high-speed movements.
Innovation Solution
The outboard motor design incorporates a first damper member to support the motor body's weight and attenuate vibrations during low-speed movement, while a second damper member with inclined surfaces receives loads in the left-right direction during high-speed movement, minimizing control stability loss by reducing the amount of shape change and maintaining effective vibration attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the damper member is made more flexible to attenuate vibration, then vibration attenuation capacity is improved, but control stability decreases due to increased shape change and delayed rudder angle response
Solution Approach 1:
The single damper member is segmented into two separate damper members: a first damper member for supporting weight and attenuating vibration, and a second damper member for receiving loads in the left-right direction during steering. This segmentation allows each damper to be optimized for its specific function, with the first damper providing flexibility for vibration attenuation and the second damper providing stability for steering control.
Solution Approach 2:
Different parts of the damper system are given different properties: the first damper member is designed with high flexibility to maximize vibration attenuation, while the second damper member is designed with inclined surfaces to minimize shape change and maintain control stability during steering operations. Each component has localized quality optimized for its specific operational requirement.
2Object-affected harmful factors
If the damper member is made more flexible to attenuate vibration, then vibration attenuation capacity is improved, but delay time in reaching target rudder angle increases
Solution Approach 1:
The damper system is divided into two independent components that can operate simultaneously: the first damper member handles vertical vibration attenuation without interfering with steering response time, while the second damper member manages lateral loads during steering with minimal shape change, thereby reducing delay time.
Solution Approach 2:
The second damper member incorporates inclined surfaces that dynamically adjust the load distribution during steering operations. When steering loads are applied, the inclined surfaces engage to provide mechanical advantage and reduce the amount of shape change required, thereby minimizing delay time while still allowing the first damper to provide vibration attenuation.
3Object-affected harmful factors
If the damper member is made more flexible to attenuate vibration, then vibration attenuation capacity is improved, but control stability decreases particularly during high-speed movement
Solution Approach 1:
The segmentation of the damper system allows the first damper member to handle vibration attenuation from engine operation during high-speed movement, while the second damper member specifically addresses steering control stability by receiving loads in the left-right direction with minimal shape change through its inclined surface design.
Solution Approach 2:
The second damper member is specifically designed with inclined surfaces optimized for high-speed steering operations, where lateral loads are most significant. This localized optimization ensures control stability is maintained during high-speed movement while the first damper continues to provide vibration attenuation.
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 effectively attenuates vibrations during low-speed movement and minimizes control stability decrease during high-speed movement, ensuring precise steering and improved operational stability across speed ranges.
Implementation Method 1
The first damper member supports a weight of the outboard motor body. As a result, during low-speed movement, it is possible to effectively attenuate vibration which is transmitted from the engine to the boat using the first damper member
Implementation Method 2
it is possible for the second damper member to receive a load in the left-right direction of the outboard motor body due to the left first inclined surface and the left second inclined surface coming into contact with each other or due the right first inclined surface and the right second inclined surface coming into contact with each other
Data Source
AI summary
In an outboard motor, a first damper member is disposed between a bracket and a casing such that the first damper member supports a weight of an outboard motor body. A second damper member is disposed between the bracket and the casing. The casing or the bracket includes a left first inclined surface and a right first inclined surface. The left first inclined surface and the right first inclined surface are inclined with respect to a front-back direction of the outboard motor body in a planar view of the outboard motor body. The second damper member includes a left second inclined surface and a right second inclined surface. The left second inclined surface is arranged to oppose the left first inclined surface. The right second inclined surface is arranged to oppose the right first inclined surface.