What is the function of gear pump shaft sleeve?

What is the function of gear pump shaft sleeve?

The YHB gear pump often gets stuck due to various reasons. The YHB gear pump may experience the locking of the shaft sleeve and shaft diameter clearance, 

and the radial clearance of the sliding bearing has an impact on bearing overheating faults. The radial clearance Δ of the sliding bearing is the difference between 

the bearing hole diameter and the shaft neck diameter. The sliding bearing should have a certain radial clearance, which serves the following purposes: YHB gear 

pump is the minimum condition for achieving active connection between the shaft and the bearing; It is the guarantee of the operating accuracy of the control 

shaft; It is an important condition for the formation of liquid lubrication

The radial clearance of the sliding bearings in YHB gear pumps is very important, and being too large or too small can be extremely harmful The clearance is too 

small to form a lubricating oil film, and the frictional heat is not easily carried away, causing the bearing to overheat and in severe cases, it may "hold the shaft"; 

Excessive clearance makes it difficult to form an oil film, which can reduce the accuracy of machine operation, generate severe vibration and noise, and even lead 

to tile burning accidents Determination of radial clearance of sliding bearings - Technical performance of a three screw pump: journal speed n=2950r/min, journal 

diameter d=30mm; The motor is a synchronous motor, and the YHB gear pump uses tin based copper as the bearing material

In the actual use of YHB gear pump bearings, due to the small clearance, the frictional heat is not easily carried away. In addition, the lubricating oil is a residual oil 

medium with a lot of impurities, which can easily enter the clearance. YHB gear pump causes the bearings to overheat, and in severe cases, they may "cling to the 

shaft" and cause tile burning

In order to prevent bearing overheating faults, if the radial clearance is increased to Δ=0.03mm, although the mating pair of the bearing can work normally, its service 

life is greatly shortened. Therefore, when determining the radial clearance of the bearing, it should be ensured that the bearing is kept as small as possible under normal 

operation After the bearing assembly, the first step is to conduct a good running in and trial operation according to the running in and trial operation specifications, 

and then gradually load and accelerate to make the protruding surface of the shaft and bearing fit flat. Finally, the YHB gear pump can be put into normal operation 

Otherwise, even if the clearance is adjusted to be not small, it will still be put into normal operation due to the lack of running in test run after assembly, resulting in 

bearing overheating or even tile burning Regarding this, the radial clearance of the sliding bearing should be controlled between 0.10mm and 0.15mm The radial 

clearance of sliding bearings has a significant impact on bearing overheating and lifespan, therefore, it is essential to strictly control the radial clearance within a 

reasonable range When determining the radial clearance of bearings, it is necessary to comprehensively consider the factors that affect the radial clearance. In 

addition to considering the diameter of the shaft, speed, load, and machine accuracy, the following points should also be considered:

a. YHB gear pump bearing material Different bearing materials result in different coefficients of expansion and clearances

b. The roughness of the shaft and bearing surface of YHB gear pump

c. The geometric shape and mutual position error (i.e. roundness, cylindricity, coaxiality, etc.) of the YHB gear pump journal and bearings

d. The working temperature of YHB gear pump bearings

f. Sudden changes in the starting conditions of YHB gear pump