| 摘要 |
In a gear pump according to the present invention, a wall surface portion of a casing (2) includes a drive side partition surface (41) on which tooth crests (11) of a drive gear (10) slide, a driven side partition surface (42) on which tooth crests (21) of a driven gear (20) slide, a suction side inner peripheral surface (43) that connects the drive side partition surface (41) and the driven side partition surface (42) on a suction chamber (3) side, and a discharge side inner peripheral surface (44) that connects the drive side partition surface (41) and the driven side partition surface (42) on a discharge chamber (4) side. Tapered portions (60) are provided in connecting portions between the respective partition surfaces (41, 42) and the discharge side inner peripheral surface (44) to cause tooth spaces (12, 22) surrounded by the wall surface portion of the casing (2) and teeth of the gears (10, 20) positioned near the partition surface (41, 42) side of the connecting portions to communicate gradually with the discharge chamber (4) as the gears (10, 20) rotate.
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