Bearing grease filling ( Disulfide aluminum) After the temperature rise

1, there is a problem 6 kv high-voltage motors, 1480 r/min, before the runtime drive end bearing temperature around 40 ℃, but on the bearing grease filling ( Disulfide aluminum) , then drive run, its temperature rising, up to 90 ℃ or so, and a hissing sound, but not only the drive end bearing temperature is 25 ℃. This machine structure is the drive end ( With the equipment connection side) For the floating end, there are two sets of bearing, the inside is deep groove ball bearings, cylindrical roller bearing is outside, deep groove ball bearing and the bearing seat is a loose fit. Its found that after the collapse of deep groove ball bearings and cylindrical roller bearings have obvious traces of friction between the end face of relatively. After the scene analysis that the gap between the two bearing changes caused by the friction. Please find out why. 2, answer questions first time about add grease, should according to the usage ( Including running time, load size, and various factors such as the purity of the environment temperature and air) , according to the instruction manual or other related tips, related calculation can be found from the bearing in the manual. In addition, adding aluminum disulfide grease wrong, because often disulfide aluminum grease is suitable for low speed, in high speed doesn't fit, easy to produce the friction and heat. This example said fever after adding grease, is related to this. And add the amount of grease, do not add too much. Followed by about two bearing relative sliding, usually should not happen. A good motor design, if you use a deep groove ball bearings + arrangement of cylindrical roller bearing, deep groove ball bearings bearing chamber should be bigger than cylindrical roller bearing. If a bit more elegant design, prevent the bearing outer ring should add rubber ring run laps. At the same time, should check whether two bearing installed after the clip more tightly. Above all, it should be no problem.