Invention Grant
US09127672B2 Gear pump 有权
齿轮泵

Gear pump
Abstract:
In a gear pump in which a driving rotor that is driven by a driving source meshes with a driven rotor that is driven by the driving rotor for rotation to pump a hydraulic oil, only one of the driving rotor and the driven rotor is given the steam treatment while the other remains untreated.
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