Plunger pump joins externally gear box

The utility model discloses a plunger pump joins externally gear box relates to gear drive technical field. It includes the box, and the input shaft passes through cylindrical roller bearing I, bearing cap I installs in the box, and the output shaft passes through cylindrical roller bearing II, bearing cap II installs in the box, all installs the herringbone tooth gear train by left -hand helical gear and the oblique gear of dextrorotation on input shaft in the box and the output shaft. The utility model discloses a close the herringbone tooth gear train transmission that the profile of tooth becomes, not only improved transmission intensity, still eliminated the axial force that the helical gear produced, because the herringbone tooth gear train closes the tooth by the helical gear to form, therefore, do not need the escape of whole herringbone gear requirements of the processing, make the width of gear and gear box reduce to reduced the volume of gear box greatly, rational in infrastructure, it is convenien