齿輪式油泵是一种容积式油泵,其工作原理是:依靠齿在吸油腔一端嚙合时由于容积扩大所产生的吸油作用,以及在压油腔一端嚙合时由于容积縮小所产生的压油作用,将油自吸油腔源源不断地压向压油腔。由于齿輪传动有嚙合重迭度ε的存在,也就是說,当第Ⅰ对齿尚未脱开时,第Ⅱ对齿就开始嚙合,在这瞬間产生一个封閉空間(如图1a)。齿輪继續旋轉时,封閉空間容积发生变化,当由大变小时封閉空間中的油压急剧上升,增加軸承及齿輪負荷,产生震动和噪音;当由小变大时油压急剧下降,压力低于飽和蒸汽压时产 Gear-type oil pump is a positive displacement oil pump, its working principle is: rely on the teeth in the oil sucking cavity at one end of the engagement due to the expansion of the oil produced by the role, as well as the pressure chamber at one end of the engagement due to reduced volume generated by the pressure of oil, The oil from the oil sucked a steady stream of pressure to the pressure chamber. Due to the presence of gear meshing engagement ε, that is, when the first pair of teeth has not been disengaged, the second pair of teeth start to mesh, creating a closed space at this moment (Figure 1a). When the gear continues to rotate, the volume of the enclosed space changes. When the pressure changes from large to small, the hydraulic pressure in the enclosed space increases sharply, increasing the load on the bearing and the gear, resulting in vibration and noise. When the hydraulic pressure changes sharply from small to large, the pressure drops sharply and the pressure is low Production at saturated vapor pressure