Introduce two installation methods for bearings
Bearings play a connecting role in many machines and equipment, mainly to drive the operation of the machine. Do you know the installation method of the bearing? In fact, the quality of the bearing installation will affect the performance, accuracy and life of the bearing, so the installation of the bearing is still particularly important. Here are two installation methods for everyone, let's take a look!
1. When the inner ring of the bearing and the shaft are tightly fitted, and the outer ring and the bearing seat hole are loosely fitted, the bearing can be press-fitted on the shaft first with a press, and then the shaft and the bearing are fitted into the bearing seat hole and press-fitted At the end of the bearing inner ring, pad an assembly sleeve made of soft metal material (copper or mild steel). The inner diameter of the assembly sleeve should be slightly larger than the journal diameter, and the outer diameter should be slightly smaller than the bearing inner ring rib. , So as not to press on the cage. The outer ring of the bearing is tightly fitted with the bearing seat hole. When the inner ring and the shaft are loosely fitted, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is tightly fitted with the shaft and the seat hole, the inner ring and outer ring must be installed into the shaft and the seat hole at the same time. The structure of the assembly sleeve should be able to compress the end faces of the inner ring and the outer ring at the same time.
2. By heating the bearing or bearing seat, using thermal expansion to transform the tight fit into a loose fit installation method. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Put the bearing or the separable bearing ring into the oil tank and heat it evenly at 80-100°C, then remove it from the oil and install it on the shaft as soon as possible. To prevent the inner ring end face and the shaft shoulder from not fitting tightly after cooling, the bearing can be axially tightened after cooling. When the outer ring of the bearing is tightly fitted with the light metal bearing seat, the hot fitting method of heating the bearing seat can be used to avoid scratches on the mating surface. When heating the bearing with an oil tank, there should be a grid at a certain distance from the bottom of the box, or the bearing should be hung with a hook. The bearing cannot be placed on the bottom of the box to prevent sinking impurities from entering the bearing or uneven heating. A thermometer must be installed in the oil tank. Strictly control the oil temperature not to exceed 100°C to prevent the occurrence of tempering effects and reduce the hardness of the ferrule.
The above is about bearing installation knowledge, everyone can learn and operate according to the above methods.