How to fix the marine bearing with the shaft and how to install it

As the tolerance value of bearing outer diameter tolerance zone is different from that of general datum axis, it is also a special tolerance zone. In most cases, the outer ring is fixed in the shell hole, and some bearing components need to be adjusted, so the fit should not be too tight, often with H6, H7, J6, J7, js6, js7, etc.

Generally, interference fit is used to fix the bearing and shaft. Interference fit refers to machining the outer diameter of the shaft to two threads larger than the size of the bearing inner hole, so that the shaft can not be inserted into the bearing inner hole, and then heating the bearing to 90 ℃ (such as boiling in hot water), the bearing inner hole will be heated and expanded, and the size is larger than the journal. At this time, install the bearing on the shaft quickly. After a few seconds, the bearing will be cooled and retracted Shrink and hold tight to the shaft.

Some marine bearings have fastening screws on the inner sleeve, which can be used to locate the bearing on the shaft. At this time, the processing dimension of the shaft is two threads smaller than the inner diameter of the bearing, so as to facilitate the adjustment of the bearing position