How to locate the bearing on the shaft and the chassis frame? In the shafting system, some shafts will experience thermal expansion and contraction in the axial and radial directions due to working load, environment and speed problems during operation; some shafts are subjected to large axial loads. , It is also necessary to transfer the load force to the frame. There are three common ways of bearing positioning.
One-way fixed at both ends
This positioning method is that the inner ring of the bearing is fastened to the journal by an interference fit, and is blocked by the shoulder, and the outer ring of the bearing is blocked by the bearing end cover. Bearings at both ends respectively prevent one-way movement of the shaft. In order to prevent the bearing from being stuck due to the thermal elongation of the shaft, there is a gap of 0.2～0.3mm between the bearing end cover and the end surface of the outer ring of the radial bearing; the radial thrust bearing depends on the bearing end cover and the bearing seat. A set of shims to adjust the internal clearance of the bearing. This positioning method is suitable for short shafts with low transmission torque and low operating temperature.
One end is fixed in both directions, one end is floating
The inner and outer rings of one end bearing are fixed in both directions and bear the two-way axial force. The bearing at the other end is not fixed in the axial direction, allowing the shaft to expand freely when heated. Due to the different bearing types, the structures of "two-way fixed" and "floating" are also different. Generally, the bearing under the smaller radial force is fixed in both directions to withstand the axial force and coordinate the life of the two bearings; when there is no axial force on the shaft, the bearing under the smaller radial force will swim to make it easier to swim. This positioning method is often used for shafts with large spans or shafts with high operating temperatures.
Support floating at both ends
When a pair of herringbone gears mesh, slight axial movement will occur due to manufacturing and installation errors. In order to prevent the gear from jamming, the two supports on the small herringbone gear shaft are often designed to move, and the two supports on the large herringbone gear shaft are fixed. When the shaft support is a sliding bearing, the shaft is positioned axially on the shaft shoulder. When one end is required to be fixed, shoulders or collars are made on both sides of the journal at the fixed end, or a combination of radial sliding bearings and thrust sliding bearings is used.
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