| 摘要 |
An oil pump rotor used for a pump having an inner rotor that has n number (n: natural number) of outer teeth formed on it and also has an outer rotor having (n + 1) number of inner teeth formed on it and meshing with the outer teeth. The amount of discharge of the pump is increased without increasing the size of the rotor, and the oil pump rotor produces less pulsation. In the oil pump rotor, outer tooth shapes (U<SUB>1in</SUB>, U<SUB>2in</SUB>) are formed by circumferential deformations (U<SUB>1</SUB>, U<SUB>2</SUB>) and radial deformations (U<SUB>1in</SUB>, U<SUB>2in</SUB>) applied to tooth shapes (U'<SUB>1</SUB>, U'<SUB>2</SUB>) formed by a mathematicalcurve, and the circumferential and radial deformations are produced with the distance between the radius (RA1) of a tooth crest circle (A1) and the radius (RA2) of a tooth root circle (A2) maintained. Because of the circumferential deformations and radial deformations, the amount of discharge of the pump is increased without increasing the size of the rotor. Also, the number of the teeth is increased, so that the rotor has less pulsation and noise. |
