Reasons for unsmooth rotation of electric flat gear pump
2017-12-23
The causes of the rotation of the gear pump caused by the heating of transfer cart can lead to the heating of the gear pump.
1. Oil viscosity is too high or too low.Reoil.
Side plate, shaft sleeve and gear face serious friction.Repair or replace.
High environment temperature, small tank volume, poor heat dissipation, will make the pump hot.Should be handled separately.
The choice of oil viscosity is too high or too low, can cause the output flow of the pump to decrease, should use the oil that the viscosity is qualified.
2, the gear tooth repair: with fine sand cloth or sharpening stone strain is removed or has ground to a prismatic parts more, then will face changing bearing and gear mesh appropriately transfer cart of research, finally clean;Any serious wear that can be observed with the naked eye shall be replaced.
Face repair: the gear face is worn because of the relative rotation of the bearing seat or front and rear cover, and the line can be used when it is light.When the wear is serious, the gear should be put on the surface grinding machine for grinding.It should be noted that the two gears must be put together on the surface grinding machine for grinding. The purpose is to ensure that the thickness of the two gears is within the range of 5 mu m.At the same time, it is necessary to ensure that the vertical and the parallelism of the face and the hole are in the range of 5 mu m, and the edge of the sharp edge is obtuse with oil stone, but not chamfered, and can be done without burr and flying edge.
When the gear meshes surface wear, the application of the oil stone will wear out the burrs of the production;At the same time, changing gear meshing position, make originally not work meshing tooth surface of meshing, such not only can guarantee its original performance, can prolong the working life of the gear.
3. The output flow of transfer cart is not enough to wear out the pump body of electric car, and the main inner cavity is in contact with the round of gear, and it happens on the oil suction side.If the pump body is symmetrical, the pump body can be turned 180 degrees to reuse;If the pump body belongs to asymmetric type, it is necessary to use electroplated bronze alloy process or brush plating method to repair the wear part of the cavity in the pump.
The wear of the bearing ring of the bearing seat is generally on the end of the contact with the gear and the inner hole of the contact with the needle.Face wear hair up line, can be four bearing race on surface grinding machine, with no contact with the gear side as a benchmark to hair end face grinding flat, should guarantee its precision in the range of 10 microns.The bearing seat ring is generally less worn, if worn, can be ground;Or properly enlarging the aperture and redressing the needle;Or replace the bearing ring.
The failure of long, short shaft and short axis, mainly in contact with needle bearing contact, wear.If the wear is slight, the polishing can be used (and replace the new needle bearing).If the wear is serious or broken, it needs to be repaired with chrome plating process or reprocessed.The parallel degree and the symmetry degree of the keyway on the long and short axis are required for the reprocessing.The balance between the flat key and the gear keyway is not too large;The shaft shall not produce radial oscillation in the hole of the gear;The coaxial degree of the shaft neck and the mounting gear part shall not be greater than 10 mu m, and the coaxial of the axial neck should not exceed 20 to 30 mu m.
