| 摘要 |
With conventional multistage oil pumps, all the components are formed of a ferrous material, and thus there have been presented a problem that the weight is large. With a multistage oil pump 1, rotors 6, 7 are connected in series. With a rotor case 2, a first rotor case 41 and a second rotor case 42 are connected in the axial direction, and the inside thereof is partitioned by a spacer 5. The first rotor case 41 and the second rotor case 42 are jointed to the spacer 5 with dowel pins 8. The rotors 6, 7 are formed of a ferrous material, while the spacer 5 being formed of an aluminum-based material. |
