The engine is the heart of the motorcycle, the engine has many metal surfaces that rub against each other, these parts move fast, the environment is poor, and the working temperature can reach 400°C to 600°C, in such a harsh working environment, only good lubricating oil can reduce the wear of the engine and extend the service life.
Oil as the engine oil, known as the "blood" of the engine, plays a vital role in the engine, today Xiaobian will take you to understand the basic knowledge of oil. ,
1. Lubricating method of oil
Motorcycle oil is the abbreviation of motorcycle engine oil, motorcycle oil usually includes engine oil, gear oil, shock absorber oil and so on.
The engine basically uses a combination of pressure lubrication and splash lubrication lubrication, pressure lubrication is to increase the oil pump on the engine, using the pressure of the oil pump to forcibly supply each lubrication point, the parts of the engine using pressure lubrication are concentrated in the crankshaft journal, camshaft and other components. The small head of the connecting rod, the cylinder, the piston, the rocker arm, etc., are lubricated by the oil splashed out after pressure lubrication.
2, the main base oil
Main base oils:
Step 1: Vegetable oil
Used in some racing cars. The friction loss is small, the lubrication performance is high, but the oxidation is fast, and it is not suitable for long-term use as ordinary oil.
2. Mineral oil
From crude oil. It can be used stably as a base oil. However, the quality varies greatly due to different origin;
3. Synthetic oils
Oils chemically synthesized for high performance. Can meet the latest fuel saving and environmental protection requirements. The price is high;
The synthetic oil composition in the base oil is more than 90%, which is a fully synthetic oil; Less than 90% is semi-synthetic oil; There's no synthetic oil. That's mineral oil
3, the composition of oil
Main base oils:
Step 1: Vegetable oil
Used in some racing cars. The friction loss is small, the lubrication performance is high, but the oxidation is fast, and it is not suitable for long-term use as ordinary oil.
2. Mineral oil
From crude oil. It can be used stably as a base oil. However, the quality varies greatly due to different origin;
3. Synthetic oils
Oils chemically synthesized for high performance. Can meet the latest fuel saving and environmental protection requirements. The price is high;
1. Base oil
Main basic component
A. Mineral oil
B. Chemical synthesis of oils, polyalphaolefin (PAO), esters, etc
Semi-synthetic oils of C.A and B
2. Additives
It is a substance added to improve the lubricity, cleanliness and oxidation stability of 4-stroke engine oil. The main use of cleaning agents, dispersants, anti-friction agents, anti-oxidants and so on;
4, the six functions of oil
Oil as the fresh blood of the engine, with lubrication, cooling, cleaning, sealing, rust prevention, shock absorption six functions, the following is introduced one by one:
oiling
There is a rapid relative slide between the piston and the cylinder, between the spindle and the bearing shell, to prevent the parts from wearing too quickly, the engine oil will form a film on the metal surface, which can reduce the friction between the engine metal parts, so that they can work smoothly.
cooling
The oil can carry the heat generated by engine parts such as cylinder heads and pistons back to the gearbox to absorb and dissipate the heat generated by combustion to cool the engine.
clean
Combustion will lead to a lot of impurities in the engine, these impurities will stick to the engine parts, the oil can be the engine parts on the carbide, sludge, wear metal particles back to the gearbox through the cycle, through the flow of lubricating oil, wash the parts of the working surface of the dirt, the oil will be in the engine continuous circulation to prevent internal impurities.
seal
Because the piston, cylinder and piston ring are made of metal, their contact points will form small gaps, resulting in leakage during compression, the oil will seal such gaps, which is conducive to the sealing of the combustion chamber and can prevent combustion pressure from entering the crankcase, thus giving full play to the power of the engine.
rust-proof
If the acid caused by combustion or the moisture in the air comes into direct contact with the metal parts in the engine, the parts may rust, and the oil will form a film on the surface of the parts in the engine to prevent the acid and moisture from coming into direct contact with them
Shock absorption
When the engine cylinder pressure rises sharply, it suddenly intensifies the load on the piston, piston pin, connecting rod and crankshaft bearing, which is transmitted and lubricated by the bearing, so that the impact load is buffered.
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