Marine Reduction Gear Stator Integration
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Solution Overview
Problem
The confined space in ship engine rooms poses a challenge for installing electrical rotating machines coupled to reduction gears, requiring a solution to reduce installation space.
Innovation Solution
Integrating the electrical rotating machine into the gearbox, which also serves as its casing, and incorporating a lubricating oil pump and coolant pump to enhance compactness and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an electrical rotating machine is coupled to the reduction gear in a conventional manner, then the machine can be installed, but the installation space required is excessive for the confined ship engine room
Solution Approach 1:
The electrical rotating machine is integrated into the gearbox by making the gearbox housing serve as the stator housing. The stator is directly mounted within the gearbox housing, eliminating the need for a separate machine housing and reducing overall installation space while maintaining functional independence of both systems
Solution Approach 2:
The gearbox housing performs dual functions: it serves as both the gearbox enclosure and the stator housing for the electrical rotating machine. This multi-functional design reduces the number of separate components and minimizes the total volume required for installation in the confined engine room
2Weight of stationary object
If separate housings are used for the gearbox and electrical rotating machine, then each component can be independently maintained, but the total weight of the system increases
Solution Approach 1:
The gearbox housing and stator housing are merged into a single structural component. This integration eliminates redundant housing materials and fastening structures, significantly reducing the total weight of the stationary system while the modular internal design preserves maintenance accessibility
3Temperature
If air cooling is used for the electrical rotating machine, then the cooling system is simple, but the machine size increases and cooling efficiency decreases
Solution Approach 1:
A liquid cooling system using coolant circulation is implemented for the electrical rotating machine. The coolant flows through cooling channels in the stator and rotor, providing superior heat transfer efficiency compared to air cooling. This allows for a more compact machine design while achieving better temperature control and cooling performance
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 reduces the installation space and weight of the electrical rotating machine while improving its cooling efficiency, making it more compact and reducing mechanical losses.
Implementation Method 1
The lubricating oil pump may circulate lubricating oil such that the lubricating oil flows downward in the gearbox, and supply the lubricating oil to the second bearing
Implementation Method 2
The coolant pump may supply a coolant to the electrical rotating machine, such that the coolant flows in contact with the stator of the electrical rotating machine
Implementation Method 3
The heat exchanger may cool the lubricating oil by exchanging heat between the lubricating oil and the coolant
Data Source
AI summary
A marine reduction gear makes it possible to reduce the installation space of an electrical rotating machine. A marine reduction gear includes: an input shaft coupled to an output shaft of an engine; an output shaft coupled to a propeller shaft that rotates a screw propeller; a gearbox accommodating an input gear provided on the input shaft and an output gear provided on the output shaft, the gearbox supporting a first bearing that supports the output shaft in a rotatable manner; and an electrical rotating machine including: a central shaft that rotates together with the output shaft; a rotor fixed to the central shaft; and a stator surrounding the rotor. The gearbox supports the stator and a second bearing that supports the central shaft of the electrical rotating machine in a rotatable manner.