In the process of using deep groove ball bearings, we occasionally pry off the sealed cover of the bearing. At this time, we will find that some bearings are full of grease on one side. The other side has no grease, and some bearings have uniform grease distribution on both sides, especially those with high prices. What is the reason for this? We know that bearings need grease lubrication and rust prevention during operation, especially sealed deep groove ball bearings. Without grease bearings, they cannot run at high speed, and their service life is greatly shortened.

In the production process of the bearing, it is necessary to process one by one. After the inner and outer rings of the bearing, the steel ball and the cage are assembled, the first is to rinse, and then press the sealing cover on one side, and then turn the bearing over and add grease (generally It is to add 30%~35% of the internal volume of the bearing), and then press the cover. At this point, we found that one side of the sealed deep groove ball bearing is not greased in the production process, and only one side is greased; if both sides are greased, there will be an additional process in the bearing production process, so that will reduce production efficiency.

At this time, some people will ask, why do some bearings have grease on both sides? If there is grease on both sides of the bearing seal, this one is relatively expensive, and the other is the used bearing. Why do you say that? This is the case. The high-priced bearings are generally of better quality. One side of this kind of deep groove ball bearing has been fully inspected, that is, the bearing has to undergo a rotation test. After the bearing rotates, the grease inside is evenly distributed; the other is the bearing. Used, second-hand, grease will definitely distribute evenly.

Therefore, it is normal that only one side of the new deep groove ball bearing has grease on both sides and the other side is not. The user does not need to worry, as long as the bearing is rotated a few times, or rotated on the machine for a few minutes, the grease in the bearing will rotate evenly , does not affect the use of.