Gear Pump Related Knowledge

Motor Characteristics of Gear Pump

1. Compact structure, small size and light weight

Gear pump is made of aluminum alloy manufacturing front cover, intermediate, back cover, alloy steel gear and aluminum alloy manufacturing of the pressure plate and other parts, belong to the hydraulic parts, front and back cover each pressure mounted two DU bearing, DU material is the ideal bearing material of gear pump, can greatly improve the life of the gear pump.

2. Work reliably

The pressure plate is the main component of radial and axial pressure compensation, which can reduce the bearing load and automatically adjust the axial clearance of the gear pump, so as to effectively improve the performance index and reliability of the gear pump; GM5, GPC4 series of gear motors can provide single spinning without front bearing, double spinning without front bearing and single spinning with front bearing, double spinning with front bearing four types of structure, among which the gear motor with front bearing can bear radial force and axial force.

3. High speed and high pressure

The rotational speed is 3000~4000 RPM, and the theoretical torque is 17N.m(Newton). m) ~ 64N.m, up to 20-25MPa.

4. Connection mode is suitable for imported machinery and construction machinery

In accordance with SAE and national standard GB installation flange, shaft extension, oil inlet and outlet connection line. Widely used in automobile, tractor, construction machinery, agricultural machinery and other mechanical hydraulic system.

What Should be Avoided When Using Gear Pump?

Gear pump is suitable for various industries, the transmission medium range is relatively wide, the gear pump has a firm structure, convenient installation, easy disassembly, simple maintenance, the use of uniform continuous flow, wear slightly, long service life and so on some advantages.

1, the use of gear pump in the process of often grease, grease is more volatile, so we must pay attention to add, and then keep the bearing clean;

2, use or use out of the case to put the electric oil pump in a dry, non-corrosive, relatively clean environment to go;

3, gear pump in the process of use to check and maintenance, should pay attention to check the electric oil drum to see inside the power line; Internal wiring, plugs, switches can still be used normally; Bearing parts are there any damaged places and so on;

4. Every part of the gear pump should be preserved. In the process of disassembling and checking the gear pump, every part should be preserved and kept clean.

Maintenance Method

1. Maintenance of gear pump shaft after wear

Gear pump shaft wear is mainly because of the friction and wear between the two ends of the shaft and the support needle, so that the shaft diameter becomes smaller. If the wear is minor, it can be repaired by plating a layer of hard chromium to increase the diameter of the shaft in this part. If the shaft wear is serious, it should be 45 steel or 40cr steel remanufacturing, shaft rough, fine turning, bearing parts to heat treatment, hardness is hrc60-65, and then grinding, so that the surface roughness of the bearing match parts ra is not more than 0.32μm; The tolerance of roundness and cylindricity of shaft is 0.005mm; According to h7/h6, surface roughness ra should not be greater than 0.63μm.

2 gear pump pump body wear after maintenance

Pump body surface wear is mainly in the oil - absorbing area of the circular arc face. If there is slight wear, can be used after oil stone grinding to remove burrs. Pump body is made of cast iron blank molding, serious wear should be replaced by new parts. If the two end faces of the pump gear are repaired by grinding, the width of the pump body should also be changed, and the size of the two end faces of the pump body should meet the technical requirements after reprocessing.

3 gear pump two end cover wear after maintenance

The end cover of the gear pump is made of cast iron. After the phenomenon of wear, it can be ground and repaired on the flat plate slightly. When the wear is more serious, it should be ground and repaired on the surface grinder. The plane contact between the end cover and the pump body after grinding should not be less than 85%. The flatness tolerance, the perpendicularity tolerance of the end facing the center line of the hole, the parallelism tolerance of both ends and the parallelism tolerance of the center line of the two axis holes are 0.01mm. The surface roughness ra after grinding shall not be more than 1.5 μm.

4. Maintenance and replacement of needle roller bearings for gear pumps

Pump parts after maintenance, bearing needle roller should be replaced. The requirements for needle rolling are: the size error of all needle rolling diameter should not exceed 0.003mm, the length tolerance is 0.1mm, and the clearance with the shaft should be about 0.01mm; When the needle rolling assembly is filled with the bearing shell according to the quantity requirements, the needle rolling should be arranged parallel to each other.