What types of oil pumps are commonly used?
There are three types of oil pump: gear oil pump, rotor oil pump and reciprocating oil pump.
1.Gear oil pump:
The gear oil pump consists of two gears. Oil inlet and outlet ports are machined on the oil pump housing. A driving gear and a driven gear are installed in the oil pump housing. There is a small gap between the gear and the inner wall of the housing. When the gear rotates clockwise, the volume of the oil inlet cavity increases due to the movement of the gear teeth away from the gear engagement, and a certain degree of vacuum is generated. The lubricating oil is filled and filled into the oil inlet cavity from the oil inlet. The oil pressure rises, and the lubricating oil is transported to the engine oil passage through the oil outlet.
2.Rotor oil pump:
The oil pump housing is equipped with inner rotor and outer rotor. The inner rotor is fixed on the driving shaft through the key, and the outer cylindrical surface of the outer rotor is matched with the shell. There is a certain eccentricity between the two. During the rotation of the inner and outer rotors, the tooth profile of each tooth of the rotor can always be in contact with each other in points, so that four closed working cavities are formed between the inner and outer rotors. Because the outer rotor is always slower than the inner rotor, the volume of these four working cavities is constantly changing.
3.Reciprocating oil pump:
The reciprocating oil pump is composed of a piston and a spring pushed by a cam. Reciprocating oil pump is an intermittent pump with small power, which is suitable for low oil volume units.
The oil pump is a component used to increase the oil pressure and ensure a certain amount of oil to force oil supply to all friction surfaces. Gear-type and rotor-type oil pumps are widely used in internal combustion engines. Gear oil pump is widely used for its simple structure, convenient processing, reliable operation, long service life and high pump oil pressure; The rotor of the rotor pump is complex and usually pressed by powder metallurgy. This pump has the same advantages as the gear pump, but has compact structure and small volume.
