Forged Marine propeller Shaft
Different lubrication systems have a significant impact on the operation of the stern shaft. The following is an analysis of several common lubrication systems:
Oil lubrication system: Lubricating oil can form an oil film between the stern shaft and the bearing, effectively reducing the friction coefficient, reducing wear, and improving transmission efficiency. It also has good heat dissipation performance, which can promptly take away the heat generated by friction, prevent the stern shaft and bearing from overheating, and extend the service life. However, the oil lubrication system needs to be equipped with a complete sealing device, otherwise it is easy to leak oil and pollute the marine environment.
Water lubrication system: Water is used as a lubricant, which is widely available and environmentally friendly. Water has a low viscosity, which can reduce power loss. It can also be obtained directly from the sea, and the operating cost is low. However, the lubrication performance of water is relatively poor compared to oil, and the material requirements for the stern shaft and bearing are high. Materials with good corrosion resistance and wear resistance must be used, and the water quality must be ensured to be clean, otherwise impurities will easily lead to increased wear.
Grease lubrication system: Grease has good adhesion and can form a stable lubricating film on the surface of the stern shaft. It does not need to be relubricated for a long time. It is suitable for some low-speed, heavy-loaded and infrequently maintained stern shaft parts. However, grease lubrication has poor heat dissipation performance. When running at high speed, the lubrication effect may be affected by excessive temperature, and it is relatively troublesome to replace the grease.
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