Patent ID: 8684473

Claim:
A gear pump comprising: a drive shaft driven by a driving source; a first gear arranged to rotate integrally with the drive shaft, and to form a first pump, the first gear having a first surface and a second surface opposite to the first surface of the first gear; a second gear arranged to rotate integrally with the drive shaft, and to form a second pump, the second gear having a first surface and a second surface opposite to the first surface of the second gear; a first plate disposed between the first gear and the second gear, and arranged to liquid-tightly seal the first surface of the first gear, and to liquid-tightly seal the first surface of the second gear; a pair of second plates disposed, respectively, on the second surface of the first gear and the second surface of the second gear, and arranged to liquid-tightly seal the second surface of the first gear and the second surface of the second gear, each of the second plates including a tooth top sealing portion having a seal surface arranged to seal a tooth top of the first gear and a tooth top of the second gear, and to form a suction portion with the first plate and the second plate; and an urging member urges the drive shaft toward the seal surface of the tooth top sealing portion of one of the second plates.