There are many reasons for the failure of cylindrical roller bearings. In addition to normal bearing fatigue peeling, factors such as failed seals, too small bearing clearances caused by tight fits or poor lubrication can all leave special failure marks and failure modes. Therefore, inspection of bearing failure can find the cause of bearing failure most of the time, so that corresponding measures can be taken to prevent it in time.

Generally speaking, 1/3 of the bearing failure is because the bearing has reached the fatigue spalling period, which is a normal failure; 1/3 is premature failure due to poor lubrication of the bearing, 1/3 is prematurely caused by pollutants entering the outer spherical bearing or incorrect installation Invalidate. Generally speaking, there are the following seven common symptoms when the bearing is running abnormally: bearing overheating, bearing noise is too large, bearing life is too low, vibration is large, the machine performance requirements are not met, the bearing is loose on the shaft, and the shaft is difficult to rotate.

Bearing raceway sound and its control method Raceway sound is a slippery continuous sound produced by rolling elements on the raceway surface when the second-class bearing is running. It is a unique basic sound that occurs in all rolling bearings. The general outer spherical bearing sound is the raceway sound plus other sounds. The raceway sound of the bearing is irregular, the frequency is above 1000Hz, and its main frequency does not change with the speed, but its total sound pressure level increases with the speed of the speed. For bearings with loud raceway sound, the sound pressure level of the raceway sound decreases with the increase in viscosity; while for Class 2 bearings with low raceway sound, the sound pressure level decreases when the viscosity increases to more than about 20mm2/s. And it has increased. The greater the rigidity of the bearing seat, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and main frequency of the raceway sound will increase sharply as the radial clearance decreases. The methods to control the raceway sound include: select low-noise bearings, that is, bearings with small waviness, and carefully select the conditions of use. The noise of the raceway often affects the noise of the entire machine, reducing the noise of the raceway can reduce the noise of the entire machine.

The impact sound of rolling elements and their control methods. When larger bearings or outer spherical bearings are running at low speed under pure radial load, because the centrifugal force of the rolling elements is small, the rolling elements in the non-load area will impact the cage or The raceway makes noise. But as the speed increases, this sound will disappear. The methods for controlling the impact sound of rolling elements include: appropriately reducing the radial clearance, and using a second-class bearing with a reasonable structure and a flexible cage.

Bearing rolling noise and its control method Rolling noise is the harsh metal friction sound that may occur in all occasions. It mostly occurs in larger grease-lubricated bearings, and it is more likely to occur in grease with degraded base oil performance. Occurs, and it hardly occurs during oil lubrication. In addition, it is more prone to occur in winter. When bearing pure radial load, it is prone to occur in occasions with large radial clearance, and depending on the size of the model, it is prone to occur within a specific speed range, and it will occur continuously. It will appear intermittently again. The outer ring raceway adopts a special processing method to prevent the appearance of rolling noise. If necessary, this type of outer spherical bearing can be selected, or the radial clearance of the bearing can be appropriately reduced, the use of high-performance grease and the improvement of the matching parts of the bearing的rigidity.