The selection and use of TIMKEN bearings

A, selection of bearings, bearing type 1 choice: bearing model is commonly used by the user's technical personnel according to the product of form a complete set of conditions and the load bearing for selection. Business people mainly learn the user's actual load is consistent with the selected TIMKEN bearings, if the bearing can not meet the use requirement, should suggest customer re-election model as soon as possible, but unless special products on the choice models generally do not have what problem. 2, the selection of the bearing clearance: user when buying bearings generally just let us know in what type, grade, rarely on bearing clearance request, business people must ask bearing conditions of use, which the bearing rotating speed, temperature and tolerance are directly related to the selection of the bearing clearance. Generally under 3500 RPM speed motor mostly adopts CM clearance, such as high temperature and high speed motor, require the use of relatively large clearance. TIMKEN bearing clearance after assembly will rise because of the inner hole and cylindrical reduction and lead to reduce, the reduction of clearance = interference quantity x 60% ( Except the bearing chamber is aluminum) 。 Such as bearing clearance is zero before assembly. 01 mm, interference when assembling the quantity to zero. 01 mm, bearing assembly after the clearance of 0. 004mm。 In theory at zero clearance noise and bearing life can reach the best state, but in actual operation considering the problems such as temperature, bearing clearance to 0 after assembly. 002mm- 0. 004 mm is better. 3, the choice of grease: the choice of grease are generally according to the requirements of the bearing rotating speed, heat resistance, noise and choose starting torque, etc, required business people to know a lot about the performance of all kinds of grease. 4, the choice of bearing seal type: the bearing lubrication can be divided into oil lubrication and grease lubrication. Oil lubricated bearing is generally choose form of bearing, grease lubricated bearing dust cover is generally selected or rubber seal seal. Dust cover suitable for high temperature or the use of good parts, seal two points contact seal and non-contact seal and contact seal dustproof performance is good but the starting torque, the sealing type starting torque is small, but there is no contact sealing performance is good. Bearing in the automobile, household appliances motor bearing of motor bearing, motorcycle bearing, the health care professional manufacturing, motor bearing industry makes the optimal bearing noise and life. Second, bearing matters should be paid attention to when using 1, selection of shaft and the bearing chamber tolerance and control: after the bearing pressure into the TIMKEN bearing 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 bearing 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, lower die when being connected to outside the level state, if there are any tilt can lead to bearing channel due to mechanical damage, and make the bearing guide ring. 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 and humidity, the TIMKEN bearing 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. A, use when installation should careful not allowed powerful punch, are not allowed to use hammer percussion TIMKEN bearing directly, not allowed by transfer roller pressure. 2, using appropriate and accurate installation tools use a special tool, as far as possible to avoid use cloth class and short fiber, things like that. Third, try to keep the bearing and the surrounding environment clean dust into the bearing even invisible to the naked eye smile, also can increase the bearing wear, vibration and noise. Four, to prevent rusting of the bearings directly with the hand take bearing, to fully wash hands sweat, and again after coated with high quality mineral oils, especially in the rainy season and summer to pay attention to rust. In some special operating conditions, can obtain a longer than traditional computing by TIMKEN bearing life, especially in the case of light load. These special operating conditions is, when the rolling surface ( Track and rolling piece) Can be separated by a lubricating oil film effectively and the surface of the limit of pollutants may cause damage. In fact, under ideal conditions, the so-called permanent bearing life is possible.