Turbocharger bearings in machinery in the main role is to support and reduce friction, so bearing accuracy, noise, are directly related to the use of machinery and life. Often met with some customers but business people are always using the best or SKF bearings its efficiency is not high, which concerns the use and selection of bearings. Maybe someone will say "bearing service and selection that is the user ′s, and I just what users wanted me to sell." But as a qualified sales staff in addition to master′s own product knowledge to master the use, that is sales, based on the user′s performance of products, use the criteria to select the best supporting bearings. That is now the world′s largest specialized manufacturing and sales of the company′s popular.
　　Because the turbocharger bearings type range, will be used primarily for the widest range of use and choice of deep groove ball bearings for some analysis. Hope awareness bearing fewer people can understand more about the bearing.
　　A, bearing selection
　　1, the choice of bearing type: bearing type is generally determined by the user′s technical staff according to the conditions of use of the products and select the load on the bearing. Principal business personnel to understand the actual load is related to the selected user the supercharger bearings in line if the bearing does not meet the requirements, you should advise the customer as soon as possible a new election model, but unless a special product in select models are generally not a problem.
　　2, bearing clearance options: users at the time of purchase bearing usually only inform on what type, grade and rarely claim on bearing clearance, business person must ask the bearings of the conditions of use, speed, temperature, combined with tolerance of the bearing of which are directly related to the Turbo bearing clearance options. At 3,500 rpm the motor speed below mostly CM clearance, such as a high speed motor requires a relatively large clearance. Bearing clearance after Assembly as large and cylindrical hole up in narrow and lead to a reduction, clearance reductions = interference x60% (bearing housing is aluminum). Before Assembly of the bearing clearance is 0.01mm, Assembly interference of 0.01mm, the bearing clearance is 0.004mm. In theory bearing swimming in the zero-gap State of the noise and life is best when, taking into account issues such as temperature rise in the actual operation, FAG bearings clearance after Assembly is 0.002mm-0.004mm better.
　　3, choice of oils: bearing grease is generally chosen based on speed, temperature, noise requirements and starting torque of select required business performance to various oil very well.
　　4, selection of bearing type a, b, c: lubrication of turbocharger bearings can be divided into oil and grease lubrication. Oil-lubricated bearings are generally used bearings, grease lubricated bearings generally use rubber seals shields or seals. Dust cover for high temperature or use the good parts, seals-contact and non-contact sealed type sealed two-contact sealing, dustproof performance good, but starting torque, non-regulated braking torque is small, but good sealing performance, no-contact.
　　B, the bearing should be used note
　1, selection and control of shaft and housing tolerances: bearing pressed into the bearing back rotational flexibility of a block. If there is clearly turning the inflexible, it indicates that the axis dimensions are too large, tolerance to go down. If bearings are pressed into the shaft turn by hand after apparent "Salsa", the tolerances of the shaft may be too large or the roundness of the axis bad. So when the control shaft and housing tolerances to control the roundness, many domestic manufacturers currently control the tolerance, not to control the roundness.
　 2, bearing Assembly methods: since the bearing is a high precision products, such as improper Assembly can easily cause damage to the bearing Raceway, cause damage to the bearings. During Assembly of the bearing should be dedicated mold, able to beat, only small forces when pressed into the shaft, pressure ring only ring stress. Requirements when using pneumatic or hydraulic Assembly, pressing up or down mode is level, if tilt will cause damage to the bearing Raceway due to stress and make the Turbo bearing noise.
　　3, assemble foreign body to prevent: the bearings are mounted to the rotor dynamic balance easily will enter the bearing dynamic balancing produced when iron filings, it is therefore advisable to complement NSK bearings before balancing. Some manufacturers for ease of Assembly, Assembly in the bearing Chamber coated with oil or grease lubrication, but often operations staff is difficult to control, if oil or grease in the bearing Chamber accumulates more in the bearing rotates easily along the shaft into the bearing. Preferably do not oil or grease the bearing room, if not not to control shall not be over bearing Interior accumulates.
　　4 Prevention of rust, paint: paint the rust is characterized by multiple sealed-type motor, motor Assembly, sounds very good, but after some time in the warehouse, the electrical noise gets so large, remove the bearing with serious rust. Many manufacturers are considered to be before bearing problems, after discovery, electrical machinery plant has been realized mainly insulating paint problem right now. The problem mainly because of the acidity of insulating varnishes containing volatile substances formed under certain temperature, humidity, corrosive substances, corrosion and cause damage to the bearings bearing Raceway. The problem can only be chosen well varnished, and after drying after a period of ventilation Assembly.
　　Bearing life is closely related to the manufacture, Assembly, use, and must in every aspect to make bearings in top operating condition, so as to prolong the life of turbocharger bearings.