Rotor pump

Hi friends,
Rotor pump is a automobile component. It is used to low pressure oil is converted to high pressure oil with help of two rotor lobes. One is rotor ‘A’ another is rotor ‘B’.’ A’ is the external rotor having the number of lobes one more than on the internal rotor ‘B’. The axes of rotation of the two rotors are different. So it causes the size of the spaces between them to vary. Rotor ‘B’ gets its drive from the engine and causes rotor ‘A’ to rotate along with it. The oil enters the pump through inlet port, as the rotor lobes are moving out of mesh. The oil is then transported from inlet to the outlet of the pump in the spaces between rotor lobes. The rotation reduces the clearance between the lobes. Then the oil is discharged under pressure as the lobes of the rotors move in to mesh at the outlet port. This type of pump is about 25% percent more efficient and compact than the gear pump. Also reduces noise in running. Thank you.