There are several reasons for bad speed roller bearings?
Several reasons to influence the speed of the roller bearings: 1 bearing inner sleeve and the outer space is too big or too small2 uneven size of bearing roller3 is the bearing retainer standard?4 whether the bearing inner and outer sleeve meets the national standard?5 whether the bearings are flush to ensure that there is no stolen goods?These are personal opinions
Generally in the 3500 rpm / min. the speed of the motor is mostly CM clearance, such as high temperature and high speed motor requires relatively large clearance. Bearing clearance in the assembly will be reduced because of round holes and swollen and lead to reduced clearance, reducing the amount of interference amount = x 60% (except for the bearing housing is aluminum). For example, bearing assembly before the clearance is 0.01mm, assembly interference is 0.01mm, then the bearing assembly after the clearance of 0.004mm. In theory, bearings in the zero clearance, noise and life expectancy to achieve the best state, but in actual operation, taking into account the temperature rise and other issues, the bearing in the assembly clearance for 0.002mm-0.004mm better.Selection of oils: oils are generally chosen to choose spherical roller bearing speed, temperature, noise requirements and starting torque requirements, business performance is understanding of various oils.
The use of factors of speed and bearing roller bearings are closely related, in particular, have:The installation condition is one of the primary factors in the use of factors, the bearing is often due to improper installation and lead to the whole bearing between the parts of the stress state changes.Selection of bearing clearance: the user at the time of purchase bearing generally will only inform on what type, grade, rarely claim on bearing clearance, operations personnel must ask the conditions of use of INA bearings, spherical roller bearings, rotation speed and temperature tolerances are directly related to the selection of bearing clearance.
