Patent ID: 8360762
Filing Date: 2013-01-29
Classification: F04C

Abstract:
1. An oil pump rotor comprising: an inner rotor formed with n (n: a natural number) external teeth, and an outer rotor formed with n+1 internal teeth which are in meshing engagement with each of the external teeth, wherein the oil pump rotor is used in an oil pump which includes a casing having a suction port for drawing in fluid and a discharge port for discharging fluid and which conveys the fluid by drawing in and discharging the fluid due to changes in volumes of cells formed between surfaces of the internal teeth and surfaces of the external teeth during rotations of the rotors under meshing engagement therebetween, and wherein a tooth profile of the external teeth of the inner rotor is formed by a deformation in a circumferential direction and by a deformation in a radial direction applied to a tooth profile defined by a mathematical curve, with the deformation in a circumferential direction being applied while maintaining a radius R