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Assembling and disassembling steps of radial bearing with cylindrical bore

by:JNSN     2021-12-18
1. Installation    usually inseparable inner and outer rings of radial bearings, the inner ring and the shaft often use a tighter fit; the outer ring and the seat hole use a looser fit. At this time, pressure can be used to press-fit the bearing on the shaft first, and then the bearing and the shaft are installed in the bearing housing hole. The assembly sleeve used during press-fitting is made of soft metal, such as copper or mild steel. The inner diameter of the sleeve is slightly larger than the shaft diameter, and the outer diameter is slightly smaller than the bearing inner ring rib. When the bearing must be installed on the shaft and in the seat hole at the same time, add a pressure plate between the sleeve and the end face of the bearing. The bore diameter is slightly larger than the shaft diameter, and the outside diameter is slightly smaller than the bearing outside diameter. Its function is to prevent the outer ring of the bearing from flexing or jamming in the seat hole. The pressure exerted on the sleeve can be mechanical or hydraulic. But never directly hammer the end face of the ferrule. Because the ferrule is a hardened thin-walled part, hammering is prone to surface cracks.  2. Heating installation   The force required to install the interference ring is related to the size of the bearing and the size of the fit interference. For medium and large bearings with large interference, heating installation is often used. Before hot fitting, put the bearing into the oil tank and heat it evenly to 80℃~100℃, then take it out of the oil and install it on the shaft. The bearing should not be placed on the bottom of the box during heating to prevent precipitated impurities from entering the bearing. And the oil temperature should be strictly controlled not to exceed 100°C. According to the batch size of the bearing, other electric heating methods can be used, such as induction heaters, electric heating plates and electric furnaces.  3. Disassembly   When disassembling an inseparable bearing whose inner ring is tightly matched with the shaft, and the outer ring is loosely matched with the housing hole, first take the shaft and the bearing out of the housing hole, and then remove the bearing from the shaft. When disassembling the separable bearing with inner and outer rings, first remove the shaft together with the inner ring, and then remove the inner ring from the shaft; remove the outer ring from the bearing seat hole. The bearing can be removed from the shaft or the inner ring of the bearing can be removed from the shaft with a press. Screw mechanism can also be used. When the outer ring fits tightly in the seat hole, a pressure mechanism can be used to press out the outer ring.
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