Koyo import bearing used in life and the analysis of limit speed

1, selection of shaft and the bearing chamber tolerance and control: after bearing pressure into the bearing Koyo import should be flexible rotation without blocking. If there are any obvious rotation is not flexible, indicates the size of the shaft is too big, tolerance to downgrade. Such as bearing pressure into the shaft by hand after the rotation has obvious 'sasha vujacic' feeling, may be the shaft or shaft roundness tolerance is too big. When control the shaft and the bearing chamber tolerance so also want to control the roundness, at present many domestic manufacturers to control the tolerance, not to control the roundness. 2, bearing assembly way: because the bearing is high precision products, such as improper assembly is easy to cause damage to Koyo bearing import channel, result in bearing damage. When bearing assembly shall have a dedicated mold, not casually, only small circle of stress when pressure into the shaft, pressure can force the circle circle. Require the use of pneumatic or hydraulic assembly, touched up and down when pressed to outside the state level, such as with sloping channel by mechanical damage can lead to bearing, guide ring and the bearing. 3, the assembly to prevent foreign body: bearing in loaded on the rotor dynamic balance when it is easy to dynamic balance of iron into the bearing inside, so it is best to install bearing before do dynamic balance. There are some manufacturers in order to convenient assembly, assembly in bearing indoor coated with some oil or grease lubrication effect, but usually operators good amount of it is hard to control, if oil or grease in the bearing interior storing up more, in the bearing rotates along axis to the bearing inside easily. Bearing chamber it is best not to apply oil or grease, if must apply to control shall not be storing up in bearing interior. 4, paint, rust prevention: paint rust is characterized by multiple in sealing type motor, the motor sound is very good, when it is assembled but put some time in the warehouse, the motor sound is very big, remove the bearing has serious rust phenomenon. Many manufacturers will think is a problem of bearing before, after our propaganda, motor factory now have realized mainly is a question of insulating varnish. Acid varnish comes out of the problem is mainly due to the formation of corrosive substances under certain temperature, humidity, the bearing Koyo import channel after corrosion result in bearing damage. The problem now is only to choose good insulating paint, after drying and ventilation assembly after a period of time. Bearing life refers to any element in the bearing fatigue spalling extend signs before operation on the total number of turns or hours worked under a certain speed. Koyo import bearing high speed will make the friction surface to produce high temperature, affect the function of lubricant, oil film, which can lead to move body temper or element agglutination failure. Bearing limit rotational speed is refers to the bearing under the precondition of work, can bear highest speed value of the thermal equilibrium temperature. Bearing work speed should be lower than the speed limit. Bearing function of the limit speed values are given in the table under the precondition of grease lubrication and oil lubrication, and only used for the level 0 tolerance, lubrication cooling normal, cooperate with rigid bearing and shaft, bearing load P 0 or less. 1 c ( C for bearing the basic dynamic load rating, only by centripetal bearing radial load, thrust bearing only by axial load) The bearings. When the bearing load P> 0. When the 1 c, the contact stress will increase; Koyo import bearing joint load, the load to move body will increase, this will increase the friction between the bearing contact surface, the lubrication state go bad. At this point, the limit speed value should be corrected.