Bearing assembly error example, early understanding little detours!

Correct gear bearing is very important, but always easy to wandering in the practical operation, problems emerge in endlessly. Reason is the central didn't noticed that some of the details from bearing present damage when device, this paper share several errors samples of bearing assembly, and correct installation methods and techniques. Common error model of bearing assembly 1 with inner ring shaft and bearing inner hole with too loose, Commonly known as the 'inner circle') Due to the matching of the shaft and the choice of inner hole is too loose, slide between the shaft and the inner hole appearance. Sliding friction will be provoked fever, bearing damage due to heat. Between shaft and hole appearance of sliding friction mark 1, inner ring end face and shoulder hot crack when the 'inner circle', the sliding friction between inner ring and the shaft will produce high temperature, due to the inner ring end face and shoulder interface is small, the temperature will be higher. Make the inner ring end face to produce hot crack, hot crack extension from time to time, will make the use of bearing inner ring infix. 2, between shaft and hole appearance produced adhesion after fever due to the 'inner circle' sliding friction between hole and shaft appearance, provoked the high temperature of curdled metal appearance and adhesion. Walk 2 outer shell holes and bearing outside diameter with too loose, Commonly known as the 'outer') Due to shell the matching of the aperture and the choice of bearing outside diameter is too loose, make them produce sliding between appearance. Sliding friction will be provoked fever, heating and bearing damage. Shell holes and between the trace of sliding bearing outside diameter appearance 1, hammer percussion bearing inner ring (directly Or outer ring) The bearing of interference fit to stop direct percussion hammer bearing inner ring ( Or outer ring) End face, it's so easy to guard the bad. Should use socket on inner ring ( Or outer ring) End, the use of the sleeve to device. 2, after rolling device to transmit force inner ring interference fit bearing, not through the outer ring and the roller force transmitted to the inner ring. This will put the bearing raceway and rolling in vitro on bad, the bearing noise and early damage during operation. The correct way should use the sleeve on the force directly to the inside end face. 3 high heating temperature through some users using acetylene torch bearing bore to stop heating, the heating temperature above 727 ℃ ( The phase transition temperature of bearing steel) When the bearing steel internal microstructure will attack changes. After the bearing cooling, bearing inner hole will not be able to restore to its original size, usually is bigger than the size of the before heating. After heated by acetylene torch bearing, appearance into black bearing device to install right bearing should be as far as possible in a dry, dust-free area to stop, and stay away from metal debris and dust equipment. When necessary device in a complex environment, should be to minimize pollution. Bearing device, shall be based on the type and size, select machinery, heating or hydraulic way to stop. Cylindrical bearing assembly 1, cold equipment can cooperate is not too tight little bearing, can pass a way out of the sleeve and the hammer, quietly tapping the sleeve bearing is installed to the appropriate location. When knock should as far as possible the effect on the bearing ring, in order to avoid bearing tilt and tilt. Big local bearing by using pressure into the stop device. If want to bearing the inside and outside the circle of loaded on the shaft and bearing seat at the same time, must ensure that the same pressure effect on the outer ring, at the same time, and necessary and device tool interface in the same plane. 2, thermal device, usually on larger bearing device, heating without bearing or bearing seat is impossible, because with the increase of the size, the greater the force of demand when device. Heat transfer between the demand bearing ring and shaft or bearing the interference temperature mainly depends on the quantity and the diameter of the bearing fit place. Open type bearing heating temperature shall not exceed 120 ℃. Will not introduce bearings with seals and dust cover heated to above 80 ℃ ( Shall ensure that the temperature is not beyond the seals and smooth fat allowed temperature) 。 Average heating, heating bearing, do not to some overheating situation. Bearing induction heater 2 tapered bearing bearing device with cone hole, inside circle big local device in the form of an interference fit. Interference amount is made up of inner ring in the cone diameter of axle, sleeve, or on the withdrawal of the axial advance interval resolution. On the cone with the advance of the interval, the greater the bearing's radial internal clearance is small coke after measuring clearance reduction is or axial spacing to certain amount can be made. Small and medium-sized bearings can apply the bearing assembly tools or had better lock nut out inner ring to the proper position of the cone diameter of axle. In using the set of conditions, to use with the hook spanner or impact wrench locking sleeve nut. To return a sleeve bearing assembly tools available or end plate pushes it into the bearing inner hole. Large bearing demand greater force to device, thus should use the hydraulic nut. Hydraulic nut to the cone hole on the conical trunnion bearing device ( FIG. 1) , set set ( FIG. 2) And on the sleeve ( Figure 3) 。 Figure 1, figure 2 in figure 3, the working principle of oil filling method is: the hydraulic oil at high pressure through oil hole and groove, injection matching surface between bearing and the diameter of axle, form a layer of oil film. Oil film separated the matching surface, make the friction between the mating surface. This method is often used to put the bearing assembly on the cone diameter of axle directly. Essential oil hole and the groove should be a local integral design of the shaft. If tight sleeve and withdrawal sleeve, has processing oil hole groove, this method also can be used to in tight sleeve bearing device or a refund on the sleeve.