The causes of NSK bearing noise analysis solutions

First of all, the impact of the rolling element and its control method for larger models of NSK bearings or ball speed cylindrical roller bearing under pure radial load, due to centrifugal force is lesser, roller in the rolling body will impact the load area or race and making noises. But with the increase of rotational speed, the noise will disappear. Control method of rolling body impact sound: decrease the radial clearance, use with reasonable structure and material with kindliness NSK bearing retainers. Followed by NSK bearing raceway groove sound sound and its control method is when bearing is running, the roller rolling on the surface of the raceway and a line of continuous sound, is unique to occur in all rolling bearings of the basic sound. General bearing ring raceway is combined with other sounds. Ball bearing raceway is irregular, frequency above 1000 hz, its main frequency does not change with speed, but the sound pressure level increases with speed to speed up. Raceway large bearings, the rolling sound of sound pressure level decrease with the increase of the viscosity; The raceway small bearings, the sound pressure level in the viscosity increases to about 20 was/s above, from decreased to increase somewhat. The rigidity of the bearing, the greater the raceway of sound pressure level is lower. Such as radial clearance is too small, the sound pressure level and the main frequency of the raceway sound can increase sharply with the decrease of radial clearance. Method to control the sound of raceway are: choose low noise bearing NSK bearing waviness small, carefully select and use conditions. Race often affect the mechanical noise, reduce the raceway can reduce the mechanical noise. Finally is the roll of the bearing and its control method roll is cylindrical roller bearing in the harsh metal can occur in all occasions, mostly happens in large type bearing grease lubrication, and in the base oil performance degradation occurred more often in grease, almost does not occur when oil lubrication. In addition, more easily occur during the winter, when under pure radial load, the radial clearance prone to big occasions, and with different size, easy to happen in a certain speed range, both continuous and intermittent. External ring raceway take special processing method can prevent the occurrence of roll ring, can choose this kind of bearing, if necessary or appropriate to reduce bearing radial clearance, the use of high performance grease and improve to suit the bearing parts of rigidity. But sometimes due to the size of the diameter of axle and bearing hole measurement inaccuracy or cooperate with surface roughness, do not meet the standard requirements to cause excessive interference fit, the bearing race is being squeezed from a large, thus reduce the radial clearance of the bearing itself, difficult to rotate the NSK bearings, fever, wear or jammed, caused serious bearing inner and outer race in cracking during installation. Not rotating seat clearance or interference is often used not to cooperate, so not rotating seat is likely to produce tiny creep, and make the seat and the contact surface of roller changing, seat ring raceway wear uniform. At the same time can also eliminate the shaft in the bearing due to thermal elongation roller axial stuck phenomenon. Clearance fit, but too much will make not rotating seat with roller rotation, the axis ( Or bearing hole) And the inner race ( Or the seat) Serious wear and friction bearing heating, vibration occurs. 1, the rolling bearing precision is low. Solution: choose regulation accuracy grade of bearings. 2 different heart, main shaft bending or casing hole. Solution: repair spindle or box. 3, belt too tight. Solution: make the elastic of the belt can be adjusted properly. 4, bad lubrication. Solution: use the provisions, brand of lubricating materials and proper cleaning. 5, the assembly quality is low. The solution: improve the assembly quality. 6, NSK bearing inner shell run laps. Solution: replace the rolling bearing and wear parts related correcting impeller balance hole diameter and checking static balance value 7, axial force is too big. The solution: cleaning, 0 is seal ring clearance requirements. 20. 3 mm. 8, damage of rolling bearing. Solution: replace the rolling bearing.