| 摘要 |
<p>A conventional multistage oil pump is formed entirely of iron-based materials, so there is a problem in that the weight of the pump is large. In this multistage oil pump (1), rotors (6, 7) are connected in series. A rotor case (4) is formed by connecting a first rotor case and a second rotor case (42) in the axial direction, with the interior thereof being partitioned by means of a spacer (5). The first rotor case (41) and the second rotor case (42) are joined to the spacer (5) with dowel pins (8). The rotors (6, 7) are formed of an iron-based material, and the spacer (5) is formed with an aluminum-based material.</p> |
