To increase the discharge pressure and discharge amount of a fluid by restraining the fluid sucked from a suction port, from leaking to the driving gear side.
The gear pump 1 includes the driving gear 2, and a first driven gear 3 and a second driven gear 4 that are meshed with the driving gear. The driving gear and the first driven gear constitute a first pump part, and the driving gear and the second driven gear constitute a second pump part. A case 5 is formed with a first suction port 14a sucking the fluid into the first pump part; a first discharge port 19a discharging the fluid from the first pump part; a second suction port 19b connected to the first discharge port to suck the fluid into the second pump part; and a second discharge port 15a discharging the fluid from the second pump part. The first suction port 14a is disposed to separate its opening center c1 to the first driven gear side from a tangent t1 passing the circumscribing points of the driving gear and first driven gear, and the second suction port 19b is disposed to separate its opening center c4 to the second driven gear side from a tangent t2 passing the circumscribing points of the driving gear and second driven gear.
Yoshinobu Hagino
Yasuyuki Hiraiwa
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