Ship Engine Axial Vibration Damper with 3D Oil Flow Path
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Solution Overview
Problem
Existing axial vibration dampers for ship engines face challenges in enhancing damping performance while maintaining the outer dimensions and securing oil movement paths, particularly in reducing axial vibrations transmitted to ship hulls.
Innovation Solution
The axial vibration damper design includes a body unit with an annular cam portion and oil chambers, a lower frame with a socket unit and cap communicating holes, and an upper cover forming an oil flow path, allowing for adjustable cross-sectional area and gap in the oil movement path, along with an oil seal to prevent leakage, and height adjusting members to optimize damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer dimensions of the damper are maintained, then the overall size and installation space are preserved, but the oil movement path is limited and damping performance cannot be enhanced
Solution Approach 1:
The patent transitions from a two-dimensional planar oil flow path to a three-dimensional spatial flow path by introducing a vertically extending communication hole through the lower frame and oblique communication holes in the cap. This allows oil to travel through multiple levels and angles, maximizing the flow path length and damping effect within the constrained outer dimensions of the damper.
2Reliability
If the cross-sectional area and gap of the oil movement path are increased, then damping performance is enhanced, but the outer dimensions of the damper must be altered
Solution Approach 1:
The patent utilizes the vertical dimension by extending the oil communication hole through the lower frame in the thickness direction, and incorporates oblique communication holes that extend in multiple directions. This three-dimensional oil flow path configuration allows the damper to achieve enhanced damping performance through increased oil movement path length and cross-sectional area without increasing the overall outer dimensions.
3Reliability
If the oil movement path is maximized for enhanced damping, then vibration reduction is improved, but the device complexity increases
Solution Approach 1:
The patent divides the oil communication system into multiple segmented components: a vertical communication hole through the lower frame, oblique communication holes in the cap, and a flow path formed between the cap and lower frame. This segmentation allows each component to perform a specific function while collectively achieving a maximized oil movement path for enhanced vibration reduction.
4Reliability
If the damper is designed for normal operation, then damping performance is optimized, but minimal oil movement path is not secured for breakdown conditions
Solution Approach 1:
The patent incorporates a backup oil flow path configuration where the flow path between the cap and lower frame serves as an alternative route. This preliminary design ensures that if the primary communication holes become blocked during operation, oil can still move through the alternative path, maintaining minimal damping functionality under breakdown 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 design enhances damping performance by securing a maximal oil movement path without altering the damper's dimensions, increasing torsion damping, and allowing minimal oil movement during breakdowns, effectively reducing axial vibrations transmitted to the ship's hull.
Implementation Method 1
The cam portion (11a) pressurizes oil to move the oil into the other oil chamber (111)
Implementation Method 2
an oil seal (140) positioned between an outer surface of the lower frame (120) and an inner surface of the upper cover (130) and preventing the leakage of oil
Implementation Method 3
axial vibrations, transmitted as they are to the hulls of ships, need to be reduced
Data Source
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Figure 5
AI summary
There is provided an axial vibration damper including: a body unit allowing a crank shaft, of an engine for a ship, having an annular cam portion, to penetrate therethrough, and including a pair of oil chambers in contact with both sides of the cap portion to accommodate oil therein and at least one communicating hole, respectively, formed at upper ends of the pair of oil chambers; a lower frame coupled to the top of the body unit and having cap communicating holes corresponding to the at least one communicating hole; and an upper cover coupled to an upper end of the lower frame and forming an oil communicating flow path together with the lower frame.