| 摘要 |
An oil pump (1) is provided with: an inner rotor (22) rotating with a shaft (20); an outer rotor (23) disposed in a loose-fit state within a pump chamber (31) and having teeth which are provided on the inner periphery thereof and which are meshed with teeth provided on the outer periphery of the inner rotor (22); a ring-shaped pressure chamber (34) provided adjacent to the pump chamber (31) in the rotation axis (X) direction; a discharge opening (241) for connecting the pump chamber (31) and the pressure chamber (34); and a discharge passage (35) having one end (35b) connected to the pressure chamber (34) and the other end serving as a connection opening (35a). The discharge passage (35) is formed to have a circular cross-sectional shape when viewed in the rotation axis (X) direction, and is provided at a position bridging the inside and outside of the outer periphery of the pressure chamber (34) when viewed in the rotation axis (X) direction. The one end (35b) of the discharge passage (35) is provided at a position located between the ends of the pressure chamber (34) when viewed in the radial direction of the rotation axis (X), and the discharge passage (35) and the pressure chamber (34) are in direct communication with each other. |
