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Selection and control of 1 NSK, shaft and bearing chamber tolerance: NSK bearings after pressing NSK bearings should be flexible rotation not block a sense of. If there is obviously the rotation is not flexible, indicates that the axial size is too large, the tolerance to cut. Such as NSK bearing onto the shaft by hand after rotation has obvious "rustle" sense, the tolerances of the shaft may be too large or the roundness of the shaft is not good. So in the control of NSK axis and the bearing chamber of tolerance to control the roundness, many domestic manufacturers only on tolerance control, no control of roundness.
Assembly 2, NSK bearings: because NSK bearings are high precision products, such as improper assembly is easy to NSK bearing raceway damage, resulting in NSK bearing damage. NSK bearing assembly shall have the special mould, can not be beat, after pressing shaft when only small force, force pressure when only circle circle. The assembly by pneumatic or hydraulic press, in the upper and lower touch to outside in the horizontal state, if tilt will lead to the NSK bearing raceway damage due to stress, and make the NSK bearing guide ring.
3, to prevent foreign body assembly: NSK bearings easily mounted to the rotor dynamic balance when the dynamic balance of iron filings into NSK bearing, so it is best to install NSK bearing dynamic balancing. Some manufacturers in order to convenient assembly, the assembly of some oil or grease lubrication effect in NSK bearing interior paint, but the operation is often difficult to control, if the oil or grease in the bearing chamber NSK accumulated more, in NSK when the bearing rotates along the shaft into easily within the NSK bearings. NSK bearing room is not the best oil or grease, such as non coated not to control may not be in the NSK bearing indoor accumulation.
4, rust prevention paint: paint rust is characterized by multiple sealed type motor, the motor voice in the assembly is very good, but in some time within the warehouse, the electrical noise change greatly, remove NSK bearings with serious rust. Many manufacturers are considered to be before NSK bearing problems, through our advocacy, motor factory is now aware of the main insulation paint problems. This is mainly because the acidic material insulating paint volatile out of the formation of corrosive substances under certain temperature, humidity, NSK bearing raceway corrosion leads to NSK bearing damage. The problem can only be good choice of insulating varnish, and after drying ventilation for a period of time after the assembly.
NSK bearing life is related to the manufacturing, assembly, use are closely related, must be in each link all ready, can enable the NSK bearing operation in the best state, so as to prolong the service life of the bearing NSK
A, disassembly
The first 1 locking screws of eccentric sleeve on the six angle wrench to loosen with inside, and then use a small iron bar into the sink of eccentric top hole, against the axis of rotation direction play loose eccentric sleeve.
2 unscrew the bolts. The bearing and a bearing seat together removed from the shaft. Note in the bearing and shaft before. Should bearing bolt loosen the other end of the shaft, so as to avoid each other at both ends of the bearing strength and damage.
Two, installation
1 to the shaft bearings, you must first remove the fixed pin bearing jacket, while the journal surface polished smooth and clean, and in the shaft neck anoint rust and lubrication (bearings in the shaft to allow a slight rotation).
2 in the bearing seat and the bearing surfaces coated with lubricating oil, the bearing load in the bearing seat. Then the assembled bearing and NSK bearing seat is sheathed on the shaft. Pushed to the desired location for installation.
The 3 fixed bearing seat do not tighten the bolts, let the bearing sleeve bearing can rotate within the. Also installed on the same shaft end bearing and seat, axis rotating ring, so that the bearing itself automatically find the location is. Then the bearing bolts.
4 eccentric sleeve. The eccentric sleeve is sheathed on the eccentric sleeve bearing on the steps, and tighten by hand along the rotation direction of the shaft. Then insert a small iron bar or resist sink hole on the eccentric sleeve. Hammer percussion along the axis of rotation of the small iron bar. The eccentric sleeve is installed firmly, finally locking eccentric sleeve within six angle screw.