NTN bearing installation method - bearing knowledge

For NTN bearing structure, cooperate, conditions vary, in general, as more as the axis of rotation, so the inner circle need interference fit. Cylindrical hole NTN bearing, multi-purpose press pressure into, or multi-purpose hot charging method. Taper hole, installed directly on the taper shaft, or use the socket installation. When installed on the shell, clearance fit more commonly, outer ring have surplus quantity, usually use the pressure into the press and or have shrink fit method of cooling after installation. Use dry ice as coolant, shrink fit installation, the moisture in the air condenses on the surface of NTN bearing. So, need a good rust prevention measures. 1, the installation of cylindrical hole NTN bearing ( 1) Press press it into a small widely used NTN bearing press press it into. Bedding block, pad into the inner ring with press pressure to the inner ring and closely contact with quietly at the axle gear shoulder. Will block installed inner ring, outer ring fitted is the causes of indentation rolling path, crushed, so be absolutely prohibited. Operation, it is best in the mating surfaces with oil. To use a hammer beat installation, to inside is mat mat on the piece of work. This approach is often become the cause of the NTN bearing operation, so only used surplus quantity is small, cannot be used for interference quantity is big, large or medium, NTN bearing. , like deep groove ball NTN bearing non separation, NTN bearing inner ring and outer ring needs to be interference quantity installed occasions, with block MATS, with a screw or hydraulic press the inner ring and outer ring at the same time, into the. NTN self-aligning ball bearing outer ring is easy to lean, if not interference fit, also the best mat block installation. Such as roller NTN bearing, tapered roller NTN bearing type such as separation, NTN bearing inner ring and outer ring can be installed on the shaft and housing, will be installing a good combination of inner ring and outer ring, the key is the both firmly closed, so that the center does not produce deviation, force pressure initiation result of raceway surface injury. ( 2) The method of hot charging large NTN bearing, the force that press a trendy takes a lot of, so it is difficult to press in. Therefore, NTN bearing in oil heating, expansion, and then loaded on the axis of the hot charging method is widely used. Using this method, we can not increase the NTN bearing improper, finish your homework in a short period of time. NTN bearing heating temperature to NTN bearing size, the required amount of interference for reference. Hot charging work related matters needing attention are as follows: ( a) Not the NTN bearing heated to above 120 ℃; ( b) No direct contact with the bottom of the tank for the NTN bearing, best put on the metal mesh, NTN bearing or NTN bearing hanging up; ( c) NTN bearing heating to higher than the required temperature 20 ℃ to 30 ℃, so that will not happen in inner ring cooling operation, difficult to install; ( d) After installation, NTN bearing cooling, width contraction, so use shaft nut, or other appropriate method, make it tight, in case the inner ring with NTN bearing block shoulder gap. 2, the installation of cone hole NTN bearing cone hole NTN bearing is directly to the inner ring fixed in the cone axis, or use of set cover, remove the sleeve mounted to the cylindrical shaft. Big heart NTN bearing multi-purpose hydraulic installation. 3, check the NTN bearing installed after the operation, in order to check whether the installation is correct, to the examination of the operation, small mechanical rotate confirm whether can use the hand well. Check project has caused by foreign bodies, scar, indentation and seized up, bad for installation and the installation seat processing bad and the imbalance of the rotating torque, the seal clearance is too small, the installation error caused by friction torque, etc. If there is no abnormal can start power operation. Because of heavy machinery can't manual rotation, so the no-load start immediately after turn off the power, to inertia, check whether there is presence of vibration, noise, rotating parts contact, etc. , confirmed that operate without exception into power. Dynamic operation, from the beginning of the no-load speed, rated operation conditions to slowly. Test run to check the items, whether there is abnormal sound, NTN bearing temperature shift, leakage of lubricants and discoloration, and so on. In test run if discovery is unusual, should stop immediately, check the machine, it is necessary to unload NTN bearing inspection. NTN bearing temperature check general appearance supposedly from housing. But using the oil hole, direct measurement of NTN bearing outer ring temperature, more accurate. NTN bearing temperature began to rise, without exception, usually stable after 1 ~ 2 hours. If because of the NTN bearing or install such bad, NTN bearing temperature will rise sharply, abnormal high temperature. The reason such as lubricant, NTN bearing clearance is too small, too much bad installation, sealing device too much friction, etc. High-speed rotation, NTN bearing lubrication methods selection error is the cause.