The installation method of transforming a tight fit into a loose fit by heating the bearing or bearing seat and utilizing thermal expansion. It is a commonly used and labor-saving installation method. This method is suitable for the installation of cylindrical roller bearings with large interference. Before hot installation, the bearing or separable bearing collar is placed in the oil tank and evenly heated at 80-100 ℃. Then, it is removed from the oil and installed on the shaft as soon as possible. To prevent the inner ring end face and shaft shoulder from not tightly fitting after cooling, the bearing can be tightened axially after cooling. When the outer ring of the bearing is tightly matched with a light metal bearing seat, the hot installation method of heating the bearing seat can avoid scratches on the mating surface. When heating bearings with oil tanks, there should be a grid at a certain distance from the bottom of the box, or a hook should be used to hang the bearing. SKF bearings cannot be placed on the bottom of the box to prevent impurities from entering the bearing or uneven heating. There must be a thermometer in the oil tank, and the oil temperature must be strictly controlled to not exceed 100 ℃ to prevent tempering effect and reduce the hardness of the ring.
Before installing the bearing on the shaft, the fixing pin of the bearing sleeve must be removed first, and the surface of the journal must be polished smooth and clean. Oil should be applied to prevent rust and lubricate the journal (allowing the bearing to rotate slightly on the shaft).
2. Apply lubricating oil to the mating surface between the bearing seat and the cylindrical roller bearing, and install the bearing into the bearing seat. Then place the assembled bearing and NSK bearing seat together on the shaft and push it to the required position for installation.
3. Do not tighten the bolts that fix the bearing seat yet, so that the bearing sleeve can rotate inside the bearing seat. Install the other end bearing and seat on the same shaft, rotate the shaft a few revolutions, and let the bearing itself automatically align. Tighten the bearing seat bolts again.
4. Install the eccentric sleeve. First, place the eccentric sleeve on the eccentric step of the bearing inner sleeve and tighten it by hand in the direction of rotation of the shaft. Then, insert or counter the small iron rod into the counterbore on the eccentric sleeve. Use a hammer to strike the small iron rod in the direction of rotation of the shaft to firmly install the eccentric sleeve and lock the inner hexagonal screw on the eccentric sleeve
Bearings are precision components, and cylindrical roller bearings and grease contamination will prevent them from operating. In addition, among all bearings that have been sealed with grease and are maintenance free, at least 14% of pollution is significantly caused only by the use of SKF bearings in a small portion of all bearings that fail early. Bearings have excellent manufacturing and design capabilities and can provide sealing solutions for various harsh working conditions.
