Briefly analyze whether the radial clearance of the roller bearing is as small as possible?

Briefly analyze whether the radial clearance of the roller bearing is as small as possible?

Radial clearance of roller bearing:

       Not all INA bearings (roller bearing manufacturers) require the smallest working clearance, you must select the appropriate clearance according to the conditions. In the national standard 4604-93, the radial clearance of rolling bearings is divided into five groups-2 groups, 0 groups, 3 groups, 4 groups, and 5 groups. The clearance values are in order from small to large, and the 0 group is the standard clearance. The basic radial clearance group is suitable for general operating conditions, normal temperature and common interference fit; rolling bearings working under special conditions such as high temperature, high speed, low noise, low friction, etc. should use large radial clearance; Bearings for precision spindles and machine tool spindles should have a smaller radial clearance; for roller bearings, a small amount of working clearance can be maintained. In addition, there is no such thing as clearance for separate bearings; finally, the working clearance of the bearing after installation is smaller than the original clearance before installation, because the bearing has to bear a certain load rotation, and the INA bearing is matched and generated by the load. The amount of elastic deformation.

       After the bearing is installed, in order to check whether the installation is correct, it is necessary to perform a running check. Small machines can be rotated by hand to confirm whether they rotate smoothly. The inspection items include improper operation due to foreign objects, scars, and indentations, unstable torque due to poor installation and poor processing of the mounting seat, excessive torque due to too small clearance, installation error, and seal friction, etc. Wait. If there is no abnormality, power operation can be started.

Lubrication method of roller bearing:

       The lubrication methods of roller bearings are divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, it is necessary to choose a lubrication method suitable for the use conditions and purpose. If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the structure around the bearing. The advantages and disadvantages of grease lubrication and oil lubrication are compared. Pay special attention to the amount when lubricating, whether it is oil lubrication or grease lubrication, too little lubrication and insufficient lubrication will affect the life of the bearing, and too much will produce large resistance and affect the speed.

Causes of rolling noise of roller bearings:

       Vibration can be said to be commensurately sensitive to the damage of the roller bearing, peeling, indentation, rust, cracks, wear, etc. will be reflected in the vibration measurement of the roller bearing. Therefore, by using a special bearing vibration measuring device, the magnitude of the vibration can be measured, and the specific abnormal situation can be inferred through the frequency distribution. The measured value is different due to the use premise of the roller bearing or the installation position of the sensor, so it is necessary to analyze and compare the measured value of each machine in advance to determine the judgment scale