| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump free from excessive increase of a pressure at a suction side of a pump chamber in actuation of a relief valve.SOLUTION: The pump includes a housing 11 provided with a pump chamber as a circular column-shaped space inside, having a suction-side groove 11e and a discharge-side groove 11f on a bottom portion of the pump chamber formed in a recessed state at an interval along the circumferential direction of the bottom portion of the pump chamber, and further provided with a suction flow channel 11c and a discharge flow channel 11d respectively communicated with the suction-side groove 11e and the discharge-side groove 11f, an outer rotor rotatably disposed in the pump chamber and having an internal tooth on its inner peripheral side, and an inner rotor disposed in the internal tooth and having an external tooth engaged with the internal tooth at its outer peripheral side. A terminal end of a relief flow channel 11g as a discharge port of the relief valve 15 for discharging a fluid in the discharge-side groove 11f when a pressure of the discharge-side groove 11f reaches a prescribed pressure or more, is opened to the suction flow channel 11c or a connection part of the suction flow channel 11c and the suction-side groove 11e. |
