Intuitive graphical installed in 4 different position of bearing removal methods and matters needing attention - bearing knowledge

The removal of bearing is one of the important content of mechanical maintenance. Remove must comply with the bearing dismantling the basic rules, and according to the different bearing adopt different ways to remove the tools and remove. If bearing need to use again after removal, remove the applied force is absolutely can't pass through the rolling element. To separate the bearing, and roller cage components together of bearing ring can be separated from the other bearing ring sealed. And removing the separation type bearing, should put in clearance fit bearing ring off, remove the interference fit bearing, needs, according to its type, size, and cooperate way, using different tools. Remove the installed on the cylinder of trunnion bearing 1) Cold remove figure 1 remove smaller bearing, through appropriate punch, gently tap the side of the bearing ring with to be removed from the shaft for a better approach is to use mechanical drawing ( FIG. 1) 。 Pull catch should be on the inner ring or adjacent components. If the shoulder and shoulder bearing hole reserved capacity of pull extractor to grasp grooves, can simplify the disassembly process. In addition, the location of the shoulder in the hole processing some threaded hole, easy to bolt out the bearing ( FIG. 2) 。 Figure 2 large and medium-sized bearing force than usually required for machine tools can provide more. Therefore, it is recommended to use hydraulic power tools or filling method, or both. This means that you need oil hole and the groove is designed at the axis ( Figure 3) 。 Figure 3 (2) Heat remove remove the needle roller bearing or NU, NJ, and NUP type cylindrical roller bearing inner ring, suit to use heat removal methods. Commonly used tools for heating: the heating ring and adjustable induction heater. Heating ring is often used to install and remove with the same size of small and medium-sized bearing inner ring. Heating ring made of light alloy. Heating ring with the radial slot, and equipped with electrical insulating handle ( Figure 4) 。 Figure 4 if often remove the different diameter of inner ring, it is recommended to use adjustable induction heater. The heater ( FIG. 5) Heat the inner ring, quickly and do not make shaft heat up. Remove the large cylindrical roller bearing inner ring, you can use some special type induction heater. Figure 5 2 remove installed on the conical trunnion bearing can use mechanical or hydraulic power drawing pull inner ring, can remove the small bearings. Some drawing machine is equipped with spring manipulator, the use of this with each other since the design of drawing, can simplify the procedure, to avoid damage the shaft neck. If not using inner circle in drawing claws, should be through the outer ring, or adopt the way of drawing device combined with drawing piece remove bearing ( Figure 6) 。 Figure 6 using filling method, the removal of large bearing will be more safe and easy. This method at high pressure through the oil hole and the groove hydraulic oil injection between the two conical fitting surface. Dropped sharply friction between two surfaces, and create separate axial force bearing and the diameter of axle. Remove the set on a set of bearing for installation in tight small bearings on the shaft sleeve with straight body, can use a hammer to tap on a uniform effect on the bearing inner ring end face of the piece of steel to remove ( Figure 7) 。 Before this, needs to be tight sleeve lock nut loosen several times. Figure 7 for installation in tight match on the small ladder shaft bearing sleeve, can use a hammer through a special socket percussion set set of small face to remove lock nut ( Figure 8) 。 Before this, needs to be tight sleeve lock nut loosen several times. Figure 8 for installation on the tight sleeve with ladder shaft bearing, using the hydraulic nut bearing removal and simpler. This must be close to the hydraulic nut (piston position to install the right stop Figure 9) , oil injection method is more simple and easy method, but it must be used with set oil hole and the groove. Figure 9 (4) remove the back sleeve bearing of removing withdrawal on the set of bearing, must remove the locking device. ( Such as a lock nut, end plate, etc. ) For small and medium-sized bearings, can use the lock nut and hook spanner or impact wrench to remove ( Figure 10. ) 。 Figure 10 for installation on the withdrawal of large bearings, can take advantage of the hydraulic nut easy disassembly. Suggestions on the shaft end hydraulic nut installed behind the stop. Can prevent the withdrawal of the stop suddenly separated from the fit position, hydraulic nut on the shaft sleeve and fly back out.