Bore shaft fit in the bearing assembly state
Mate is the determination of the assembly state of the bearing. The fit mentioned here refers not only to the hole shaft fit between the bearing and the assembly, but also to the clearance of the bearing itself. The fit of the bearing not only affects the life of the bearing itself, but also affects the smoothness, accuracy and life of the entire system.
Related to these. Here's the question to answer.
There is no black technology in the bearing. But there are only a few people in the world who can play these known technologies above one level. There are steelmaking problems, processing accuracy problems, surface shape processing problems, even the use of supporting system problems, mass production quality control problems, assembly process problems and so on. As for the bearing technology on the moving wheel, it may not be as technical as the bolts on the moving wheel.
Putting aside the restrictions on the use of EMUs, in other fields, the scientific and technological content of bearings is not low. For example, the bearings of high-precision electric spindles are used, and I am afraid that many production plants have never used them. hehe.
