Royal Dutch Oil Company was founded in 1890, and was specially authorized by beatrix wilhelmina armgard, so it was named Royal Dutch Oil Company. In order to compete with American Standard Oil Company, the largest oil company at that time, Royal Dutch Oil Company merged with British Shell Transportation Trading Company in 1907 to form Royal Dutch Shell Group.
The company has two headquarters holding system, with Dutch capital accounting for 60% and Britain accounting for 40%. The two headquarters are located in Rotterdam, the Netherlands and London, England. The group company has 14 branches, which are engaged in petroleum, natural gas, chemical products, non-ferrous metals, coal and so on. The production and marketing capacity of petroleum and petrochemical fuels ranks first in the world.
Extended data
Function of engine oil
1. Lubrication: there is rapid relative sliding between piston and cylinder, and between spindle and bearing bushing. In order to prevent the parts from wearing too fast, it is necessary to establish an oil film between the two sliding surfaces. There is an oil film with sufficient thickness to separate the surfaces of relatively sliding parts, so as to achieve the purpose of reducing wear.
2. Auxiliary cooling: Because the specific heat value of engine oil is low, and it has no cooling effect inside the engine. However, due to the heat generated by fuel combustion in the engine, when the engine is working, the engine oil can bring the heat back to the engine oil tank and then radiate it into the air to help the water tank cool the engine. What really plays a cooling role is the water (or antifreeze) outside the engine shell.
3. Cleaning: Good engine oil can bring carbides, sludge and worn metal particles on engine parts back to the oil tank through circulation, and wash away the dirt generated on the working surface of the parts through the flow of lubricating oil.
4. Sealing and leak-proof: Engine oil can form a sealing ring between the piston ring and the piston to reduce gas leakage and prevent external pollutants from entering.
5. Rust prevention and corrosion protection: Lubricating oil can be adsorbed on the surface of parts to prevent water, air, acidic substances and harmful gases from contacting with parts.
6. Shock absorption and buffering: When the engine cylinder pressure rises sharply, the load on the piston, piston plate, connecting rod and crankshaft bearing suddenly increases, and this load is lubricated through the bearing, so that the impact load it bears plays a buffering role.
7. Wear resistance: Adding lubricant to friction surfaces can reduce friction coefficient, thus reducing friction resistance, saving energy consumption and reducing wear: Lubricant between friction surfaces can reduce wear caused by abrasive wear, surface fatigue and adhesive wear.
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