oil pump stator motor parts The oil pump casing has an oil inlet and an oil outlet. A driving gear and a driven gear are installed in the oil pump casing. There is a small gap between the gear and the inner wall of the casing. The other working principle is as a gear. When rotating clockwise, the volume of the oil inlet cavity increases due to the gear teeth moving away from the toothing direction, resulting in a certain degree of vacuum. The lubricating oil is filled from the oil inlet and filled into the oil cavity, and the rotating gear will intersect the teeth. The lubricating oil is brought to the oil cavity. As the gear teeth enter the toothing, the volume of the oil outlet cavity is reduced and the oil pressure rises. The lubricating oil is delivered to the engine oil passage through the oil outlet.