What factors are related to the selection of bearing and shaft fit?

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1. The selection of bearing and shaft fit is mainly related to the size of load, speed and force direction. For example, ordinary motors are mainly subjected to radial force, which is caused by motor power output or external load; Of course, according to the situation of your main engine, there may also be some axial force and impact load. Loose fit is generally used for bearing outer ring, such as H7 and J7; The inner ring generally adopts tight fit, such as K5, K6, etc.

2. The fit clearance between bearing and shaft can be determined according to the size of bearing. For example, the fit tolerance between the bearing inner ring with a diameter of 40mm and the shaft is the shaft diameter + - 0.01, which is a good fit.

What are the advantages of the fit between bearing and shaft?

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1. The bearing inner ring usually rotates with the shaft. In order to prevent the wear caused by the relative sliding of the mating surface of the inner ring and the journal, which affects the working performance of the bearing, it is required to have a certain interference between the mating surfaces.

2. Since the inner and outer rings of the bearing are thin-walled parts, it is easy to deform if the interference is too large. Therefore, transition coordination is adopted.

3. Transition fit is selected, which is more convenient for special matching, and it is also easy to disassemble when replacing the bearing. When using other matching, the shaft and bearing will be worn, which may speed up the damage speed, and it is not easy to repair and disassemble.

What is transitional cooperation?

A transition fit is a fit that may have gaps or interference. At this time, the tolerance zone of the hole and the tolerance zone of the shaft overlap each other. Transition fit is mainly used for centering connection between holes and shafts.

1) The difference between the maximum limit size of the hole and the minimum limit size of the shaft is the maximum clearance xmax, which is the loosest state of the fit between the hole and the shaft.

2) The difference between the minimum limit size of the hole and the maximum limit size of the shaft is the maximum interference ymax, which is the tightest state of the fit between the hole and the shaft.