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Timken bearings shall be removed with the same care as during installation. Pay attention not to damage Timken bearings and parts, especially the disassembly of interference fit Timken bearings, which is difficult to operate.
Therefore, in the design stage, it is necessary to consider the convenience of disassembly in advance, and it is also very important to design and manufacture disassembly tools according to needs. During disassembly, the disassembly method and sequence shall be studied according to the drawings, and the matching conditions of Timken bearings shall be investigated, so as to ensure the safe disassembly operation.
Remove the outer ring of the interference fit. Set several outer ring extrusion screws on the circumference of the shell in advance. Tighten the screws equally while removing. These screw holes are usually covered with blind plugs, Timken Bearings tapered roller Timken bearings and other separated Timken bearings. Several cuts are set on the housing shoulder. Use cushion blocks, disassemble with a press or knock gently.
The inner ring can be easily removed by pressure machinery. At this time, Timken Bearings pay attention to make the inner ring bear its pulling force.
The inner ring of large Timken bearing is disassembled by oil pressure method. Oil pressure is applied through the oil hole arranged on the shaft to make it easy to pull out. The Timken bearing with large width is disassembled by the combination of oil pressure method and drawing fixture.
The inner ring of Nu and NJ cylindrical roller bearings can be disassembled by induction heating. It is a method of drawing after heating part in a short time to expand the inner ring.
Disassemble the relatively small Timken bearing with fixed sleeve, support the inner ring with the stop fastened on the shaft, turn the nut back several times, and knock it with a hammer with a cushion block.
The TiMn oil pressure is used to expand the inner ring of the bearing and make it easier to remove the TiMn oil in the TiMn oil pressure hole. During operation, Timken bearing may come out suddenly. It is better to use the nut as a stop.
Methods to improve the actual matching accuracy. In order to improve the actual fitting accuracy of NSK bearing during installation, the measurement methods and tools that do not deform NSK bearing must be used to accurately measure the fitting surface dimensions of inner hole and outer circle of NSK bearing.
All the measurement items related to inner diameter and outer diameter can be measured, and the measured data can be comprehensively analyzed, Size of NSK bearing installation position precisely matched with shaft and seat hole. When actually measuring the corresponding size and geometry of the matched shaft and seat hole, it shall be carried out under the same temperature conditions as when measuring NSK bearing.
In order to ensure a high actual matching effect, the roughness of the surface matching the shaft and seat hole with NSK bearing shall be as small as possible.
During the above measurement, two groups of marks indicating the direction of large deviation shall be made on the outer circle and inner hole of NSK bearing and the corresponding surface of shaft and seat hole on both sides close to the assembly chamfer, so that the large deviation of matching two sides can be aligned in the same direction during actual assembly, so that the deviation of both sides can be partially offset after assembly.
The purpose of making two groups of orientation marks is to comprehensively consider the compensation of deviation, not only improve the rotation accuracy of the supports at both ends, but also partially eliminate the coaxiality error of the seat hole between the two supports and the journal at both ends. The surface strengthening measures for the mating surface, such as sand blasting and plugging the primary inner hole with a slightly larger diameter precision plug column, are conducive to improving the mating accuracy.