To do a good job of rolling bearings of the high-pressure explosion-proof motor selection, we must first understand the explosion-proof motor field use conditions, including load driven by the motor (pumps, fans, compressors, etc.), work system, frequent start, load fluctuations; followed by the full analysis of site conditions based on the selected type of rolling bearings, and to determine the configuration of the front and rear bearings; Finally, based on a bearing life calculation to determine the size of the selection of rolling bearings.

    Rolling in the high-pressure explosion-proof motor: deep groove ball bearings, angular contact ball bearings, four point contact ball bearings, cylindrical roller bearings, various bearing characteristics and performance parameters refer to the bearing manufacturer's selection of samples .

    Commonly used in high-pressure explosion-proof motor bearing arrangement: three-bearing structure and the bearing structure, "a column of a ball and two goals in the two-bearing structure configuration; three-bearing structure bearing columns bearing ball bearings or bearing column four-point contact ball bearings, rear bearing column bearings.

Rolling bearing life calculation formula can be based on the standard ISO281-1990:

L10h = (106/60N) X (C / P) F (1)

L10h - basic rating life (90% reliability), h

C - basic dynamic load, kN

P - equivalent dynamic load, kN

N - rotational speed, r / min

F - the index ball bearings in the life of formula 3; roller bearings 10/3

    High-pressure explosion-proof motor rolling bearing calculation of life is generally not less than 4000h. But not the calculated life is the bigger the better, because the calculation of the value of life is too large, resulting in bearing selection is too large to meet the minimum load requirements not rolling in the operation of a rolling element harmful sliding, leading to premature bearing damage. Therefore, the calculated life of the rolling bearing can be controlled in an appropriate range. Rolling selection should be noted that the operating speed of the rolling bearing, bearing manufacturer's selection of samples provides the specifications of different models bearing allows the use of speed. Exceeds the bearing allows the use of working speed will result in a sharp decrease of the lifetime of the rolling bearing. In order to make the good running of the bearing, radial bearing clearance select is very important. General guideline, ball bearings clearance should be zero, or a slight preload. In practical applications, it is recommended that a large selection of clearance C3 group, a large selection of clearance of the rolling bearing, bearing noise, but is conducive to reduce the operating temperature of the rolling bearing, improve the service life of the bearing.