At present, small oil-powered vertical fixed-wing UAV use two-stroke engines. The biggest feature of the two-stroke engine is that the number of parts is small, the structure is simple, the weight is light, the power is large, the size is small, and the fuel consumption rate is low. Friction occurs between these parts when the engine is started. This friction will increase the power consumption of the engine and accelerate the wear of the working surface of the parts, and the heat generated by the friction may also burn the working surface of the parts, making the engine unable to run, but the two-stroke engine does not have an independent lubrication system, which needs to be used in the fuel oil. (ie gasoline) is evenly mixed with a certain proportion of two-stroke engine oil. This is why oil is added to the two-stroke engine fuel.
(use bad engine oil made engine damage)
The role of the lubrication system
When the engine is working, the oil will be delivered to the surface of all parts, and an oil film will be formed on the surface of the parts, thereby reducing frictional resistance, power consumption, and wear of parts, so as to improve the reliability and durability of the engine.
Lubricating oil (Oil) has the following functions:
★Cooling: The oil flows over the working surface of the parts during the circulation process, which can reduce the temperature of the parts.
★Cleaning: The oil can take away the metal debris generated on the friction surface, and wash away the carbon deposits deposited on the cylinder, piston, piston ring and other parts.
★Sealing: The oil adheres to the cylinder wall, the oil film on the piston and the piston ring, which can play the role of sealing and preventing leakage.
★Anti-rust: Oil has the effect of preventing parts from rusting. For four-stroke engines, such as automobiles, there are separate lubrication systems. It mainly consists of oil pump, oil filter, oil cooler, oil pan and other components to form a complete lubrication system, and uses special oil to lubricate and cool all parts of the engine.
Classification and difference of engine oil
engine Oil is divided into fully synthetic oil and semi-synthetic oil, the difference:
fully synthetic oil
semi-synthetic oil
1. Different base oils: Semi-synthetic motor oil uses the third type of base oil; full synthetic motor oil uses a mixture of the third, fourth and fifth types of base oils.
2. The applicable temperature is different: the temperature range of fully synthetic oil is wider and the service life is longer than that of semi-synthetic oil.
3. Different vehicle conditions: Semi-synthetic oil is mostly used in models with economical small displacement and smooth driving; full-synthetic oil is mostly used in severe and harsh conditions. Engine oil is the engine oil, and its importance can be called the blood of the car, which can ensure the normal operation of the engine. Oil has seven functions in the engine, namely lubrication, cooling, rust prevention, cleaning, sealing, anti-wear and shock absorption. Whether the amount of oil is sufficient and how the oil is used will directly affect the normal operation of the engine.
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