What are the types of oil pumps?
1 Answers
Oil pumps are a type of hydraulic pump. In fact, there are many hydraulic pumps in automobiles, such as the power pump for hydraulic power steering and the oil pump for automatic transmissions. In hydraulic transmission control devices used in construction machinery, hydraulic pumps that generate power sources are essential. Generally, there are two types of oil pumps: one is the gear oil pump, and the other is the rotor oil pump. Gear oil pumps are divided into internal gear oil pumps and external gear oil pumps. The gear oil pump consists of a drive shaft, drive gear, driven shaft, driven gear, housing, etc. Two gears with the same number of teeth mesh with each other and are installed inside the housing. The radial and end clearances between the gears and the housing are very small. The drive shaft is key-connected to the drive gear, and the driven gear is mounted on the driven shaft. During operation, the drive gear drives the driven gear to rotate in the opposite direction. As the two gears rotate, the oil filled between the gear teeth is carried from the inlet chamber to the outlet chamber along the housing wall. On the side of the inlet chamber, a vacuum is created due to the disengagement of the gears and the continuous removal of oil, causing the oil in the oil pan to enter the inlet chamber through the filter under atmospheric pressure. On the other side of the outlet chamber, the oil is pumped out under a certain pressure through the meshing of the gears and the continuous squeezing of the oil. The rotor oil pump is a type of cycloidal gear pump that uses inner and outer rotors to pump lubricating oil. The rotor oil pump mainly consists of inner and outer rotors, such as the oil pump body and oil pump cover. The driving inner rotor and the driven outer rotor are installed inside the oil pump housing. The inner rotor has four convex teeth, and the outer rotor has five concave teeth. The inner rotor is fixed to the drive shaft, while the outer rotor can rotate freely within the oil pump housing, with a certain eccentricity between them. During operation, the inner rotor drives the outer rotor to rotate in the same direction. Due to the eccentricity and tooth profile of the two rotors, the tooth surfaces of the inner and outer rotors maintain line contact at any angle, forming four working chambers between the teeth of the inner and outer rotors. Since the inner rotor rotates faster than the outer rotor (with a transmission ratio of 5:4), when a working chamber rotates from the inlet, the rotors disengage, the volume gradually increases, creating a vacuum. Lubricating oil is sucked in from the inlet. As the rotors continue to rotate, the lubricating oil is carried to the other side of the outlet. At this point, the rotors engage, the volume of the oil chamber gradually decreases, the oil pressure increases, and the oil is squeezed out between the teeth and sent out through the outlet.
