Because the wide range of types of self-aligning ball bearings, FAG bearings will be used primarily for the widest range of use and select some analysis. Hope those who know less about bearing to deepen students ' understanding of reverse-aligning ball bearings.
　　A, bearing selection
　　1, self-aligning ball bearing type choices: FAG bearing designation is generally determined by the user's technical staff according to the conditions of use of supporting products to choose and load reversed-aligning ball bearings. Business personnel are mainly about user load are compatible with the selected self-aligning ball bearings, if self-aligning ball bearings do not meet usage requirements, you should advise the customer as soon as possible the options model, but unless special products generally do not have problems in the selected model.
　　2, self-aligning ball bearing clearance options: when users buy bearings generally will only inform on what type, grade, rarely claim on bearing clearance, business people must ask the ball bearings with bearing conditions of use, speed, temperature, fit tolerance is directly related to the selection of clearance of self-aligning ball bearings. General below 3,500 rpm rotational speed of the motor they use CM clearance, such as high temperature and high speed motor requires a relatively large clearance. Self-aligning ball bearing clearance after Assembly is large and cylindrical hole up in narrow and lead to a reduction, clearance reductions interference = x60% (except for self-aligning ball bearings is aluminum). Like before the assembled clearance of FAG bearings 0.01mm, Assembly interference of 0.01mm, self-aligning ball bearings the clearance after Assembly is 0.004mm. In theory zero clearance of self-aligning ball bearings noise and life when you reach the best State, but in actual operation, taking into account issues such as temperature rise, FAG bearing clearance after Assembly is 0.002mm-0.004mm better.
　　3, selection of oils: ball bearings with grease are generally chosen on the basis of speed, temperature, noise requirements and torque, such as select, that operational personnel to various properties of the grease is to understand.
　　4 selection of sealed, self-aligning ball bearings: FAG bearing lubrication can be divided into the lubricating oil and grease. Oil lubricating self-aligning ball bearings are generally selected bearings, grease lubricated bearings are generally use rubber seals shields or seals. Shields for high temperature or use good parts, sealing-contact seals and two non-contact seal, contact sealed, dustproof performance is good but the torque, torque from the non-bonded seal is small, but good sealing properties of no-contact.
　　Second, bearing considerations should be used
　　1, selection and control of shaft and housing tolerances: FAG bearings onto the self-aligning ball bearing should rotate flexible no block. If there are clearly not flexible rotation, then axis dimensions are too big, the tolerance to cut. If self-aligning ball bearing onto the shaft by hand after turning there is a clear "rustle" sense, the tolerances of the shaft may be too large or the roundness of the shaft well. So in the control room good and self-aligning ball bearing tolerances when you want to control the roundness, many domestic manufacturers currently control only tolerance, not to control the roundness.
　　2 Assembly methods, self-aligning ball bearings: self-aligning ball bearings are high-precision products, such as improper Assembly is easy to reverse the heart ball bearing Raceway to cause injury, resulting in self-aligning ball bearing damage. Self-aligning ball bearings in the Assembly should have a dedicated mold, cannot be beat at will, force in pressing axis only small circles, pressing circle only large ring bearing. Assembly call for pneumatic or hydraulic, at the time of pressing die outside to level up or down status, such as tilt causes the self-aligning ball bearing Raceway due to mechanical damage, and make the self-aligning ball bearing Guide.
　　3, assembling foreign object prevention: self-aligning ball bearing when mounted to the rotor dynamic balance easily produced when iron filings into the fag bearing dynamic balancing internal, it is therefore advisable to dynamic balance before mounted self-aligning ball bearings. Some manufacturers for ease of Assembly, Assembly in interior coating of self-aligning ball bearings on some oil or grease lubrication effect, but in many cases the operator is difficult to control, if ball bearings with oil or grease in the indoor accumulates more easily along the axis of rotation of the bearing enters self-aligning ball bearings inside. Bearing room it is best not to paint oil or grease, such as non-coating is not available to control shall not be self-aligning ball bearings inside of there accumulates.
　　4 Prevention of rust, paint: paint and rust is characterized by multiple sealed-type motor, motor Assembly, sounds very good, but after some time within the warehouse, the electrical noise change very large, cut heart-breaking phenomena of ball bearing with serious rust. Many manufacturers are considered to be before bearing problems, through our advocacy, motor factory is now aware of the main insulation paint problems. Varnishes used for this issue mainly because of volatile acids under certain temperature, humidity of the formation of corrosive substances, channeling self-aligning ball bearings corrosion lead self-aligning ball bearing damage. The problem can only be good choice of insulating varnish, and assembled in the ventilation after drying after a period of time.




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