| 摘要 |
A gear pump is provided with a drive gear rotated via a drive shaft; a slave gear; a gear housing containing a gear chamber housing these gears therein; and a pump housing composed of a cylindrical housing main body with a bottom which contains the gear housing for serving as a low pressurized chamber, the inside of which communicates with the gear chamber, and an opening being defined thereon, and a covering member for closing the opening, wherein an eccentric pitted portion being eccentric with respect to the axis of the drive shaft is defined on the covering member, and the fluid return port is allowed to face to the eccentric pitted portion to function the eccentric pitted portion as a return fluid passage for return fluid, whereby it is possible to reduce a size of the gear pump without accompanying any cavitation.
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