| 摘要 |
An oil pump rotor for use in an oil pump includes an inner rotor having (n: "n" is a natural number) external teeth, an outer rotor having (n+1) internal teeth meshing with the external teeth, and a casing forming a suction port for drawing a fluid and a discharge port for discharging the fluid, such that in association with meshing and co-rotation of the inner and outer rotors, the fluid is drawn/discharged to be conveyed according to volume changes of cells formed between teeth faces of the two rotors. For a tooth profile formed of a mathematical curve and having a tooth addendum circle A 1 with a radius R A1 and a tooth root curve A 2 with a radius R A2 , a circle D 1 has a radius R D1 which satisfies Formula (1) and a circle D 2 has a radius R D2 which satisfies both Formula (2) and Formula (3), R A �¢ 1 > R D �¢ 1 > R A �¢ 2 R A �¢ 1 > R D �¢ 2 > R A �¢ 2 R D �¢ 1 ‰§ R D �¢ 2
a tooth profile of the external teeth of the inner rotor includes at least either one of a modification, in a radially outer direction, of the tooth profile, on the outer side of the circle D 1 and a modification, in a radially inner direction, of the tooth profile, on the inner side of the circle D 2 . |
