Influence spherical roller bearing service life with assembly factors

Bearing use factors mainly refers to the installation and adjustment, use and maintenance, maintenance and repair of the technical requirements. According to the technical requirements of bearing installation, use, maintenance and repair, the load, speed, working temperature, vibration, noise and lubrication conditions of the running spherical roller bearings are monitored and checked, and abnormalities are found to immediately find the causes and make adjustments to restore them to normal. The force state changes, the bearing in an abnormal state of operation and early end of life intrinsic factors mainly refers to the structural design, manufacturing process and material quality to determine the quality of the bearing three factors.

1, the choice of bearing clearance: users in the purchase of bearings will generally only inform in what type, grade, rarely will the bearing clearance requirements, business personnel must ask the use of bearing conditions, which spherical roller bearing speed, temperature, with tolerance are directly related to the choice of bearing clearance. Generally in 3500 rpm below the speed of most of the motor using CM clearance, such as high temperature high speed motor is required to use relatively large clearance. Bearing clearance in the assembly will be because of the inner hole of the rise and the outer circle of the narrowing and lead to reduce, clearance of the reduction = interference amount × 60% (bearing room is aluminum except). For example, bearing assembly clearance is 0.01mm, assembly when the interference is 0.01mm, then the bearing assembly clearance for 0.004mm. in theory bearing in zero clearance when the noise and life have reached a better state, but in actual operation in consideration of temperature rise and other issues, bearing in assembly clearance for 0.002mm-0.004mm better.

2, grease selection: grease selection is generally based on spherical roller bearing speed, temperature resistance, noise requirements and starting torque and other aspects of the choice, require business personnel to a variety of grease performance is very well understood.

3、The choice of bearing type: bearing type is generally selected by the user's technical personnel according to the conditions of use of the supporting products and bearing the load. Business personnel mainly understand whether the actual load of the user and the selected bearing, if the cylindrical roller bearing can not meet the requirements, should be as soon as possible to suggest customers to change the model, but unless special products in the selection of the model will generally not have any problems. 

4, bearing seal type of choice: spherical roller bearing lubrication can be divided into oil lubrication and grease. Oil lubrication bearing is generally used form bearing, grease lubrication bearing is generally used dust cover or rubber seal seal. Dustproof cover is suitable for high temperature or good use environment parts, seals are divided into contact seal and non-contact seal two, contact seal dustproof performance is good but the starting torque is large, non-contact seal starting torque is small, but the sealing performance is not contact good.

The metallurgical quality of the bearing material used to be the main factor affecting the early failure of rolling bearings. With the progress of metallurgical technology (e.g. vacuum degassing of bearing steel, etc.), the quality of raw materials has been improved. Raw material quality factors in the spherical roller bearing failure analysis accounted for a significant decline in the proportion, but it is still one of the main factors affecting bearing failure, whether the selection of materials is still the right bearing failure analysis must be considered factors.