What are the common types of oil pumps?
1 Answers
Common types of oil pumps include gear-type oil pumps and rotor-type oil pumps. 1. Gear-type oil pump: The oil pump housing is machined with an inlet and an outlet. Inside the pump housing, there is a driving gear and a driven gear, with a very small gap between the gears and the inner wall of the housing. The working principle is that when the gears rotate clockwise, the volume of the inlet chamber increases due to the movement of the gear teeth away from the meshing direction, creating a certain vacuum. Lubricating oil is then drawn from the inlet and fills the inlet chamber. The rotating gears carry the oil between the teeth to the outlet chamber. As the gear teeth mesh, the volume of the outlet chamber decreases, increasing the oil pressure, and the lubricating oil is delivered through the outlet to the engine oil passages. 2. Rotor-type oil pump: The pump housing contains an inner rotor and an outer rotor. The inner rotor is fixed to the driving shaft with a key, while the outer rotor’s cylindrical surface fits with the housing, with a certain eccentricity between them. The outer rotor is driven by the inner rotor to rotate. The housing is equipped with an inlet pipe and an outlet. The working principle is that during the rotation of the inner and outer rotors, the tooth profiles of each rotor tooth always make point contact with each other, forming four enclosed working chambers. Since the outer rotor always rotates slower than the inner rotor, the volume of these four working chambers continuously changes. Each working chamber connects with the inlet hole in the housing when its volume is smallest. As the volume increases, a vacuum is created, and when it connects with the outlet hole, the volume gradually decreases, increasing the pressure and forcing the lubricating oil out.
