Bearing failure occurred during operation is constant some thing, so don't be alarmed. The fault judgment and treatment is the key. Today we explain the common troubles and troubleshooting methods of bearing. Causes of bearing temperature needle: lubricating oil quality does not meet the requirements or deterioration, the oil viscosity is too high; mechanism assembly tight (spaces); preloaded bearing; bearing race rotation on the shaft or shell; overload; bearing retainer or rolling body fragmentation.
Causes the axis deviates from the correct position, the axis in high-speed motion noise. When the bearing fatigue, its surface metal flake, also can make the NTN bearing radial clearance increases the noise. In addition, needle roller bearings, lack of lubrication, the formation of dry friction and bearing broken produces abnormal sound. After bearing wear loose, loose cage damage, also can produce abnormal sound of bearing damage.
The first and the bearing manufacturing related noise: here the retainer includes noise and vibrato, cage noise occurs mainly in ball bearings and NTN bearings, when the bearing rotates as the holder of the vibration and the retainer and rolling body collision will sound. This sound is periodic. Vibrato (bearings) are a certain frequency sound, is due to the vibration caused by the waviness of the raceway surface. This kind of phenomenon is the most common problems, we need more attention to. Especially we are learning some needle roller bearing knowledge of students, to carefully look at these key elements, there may be some help to you.
Second the use of noise caused by improper: there are to many kinds of bearings. When the NTN bearing raceway surface or surface of the rolling body is bruised, indentation, rust, it will produce noise and vibration have certain cycle. When the bearing dust intrusion will produce noise in operation in the dirt. The noise is non periodic. Also accompanied by vibration, the sound size is not fixed, sometimes not.
The inherent noise third: rolling road sound and all kinds of bearing and rolling friction sound is rolling bearing raceway natural sound, sound is produced by the elastic properties of the rolling body and rolling contact time, when rotating NTN bearings, rolling body raceway rolling and making a continuous and smooth sound; not normal rolling friction sound can be issued a "creak, creak, uncomfortable metal friction abnormal sound, not sound good lubrication. It is not a problem in the general case, only the noise increased after the note.
Uneven pits and roller roller contact surface NTN bearing, the bearing plastic deformation. The reason is the effect of bearing static load or impact load, the local stress more than material yield limit of the working surface, which generally occurs on the low speed rotation of the needle roller bearing. Causes of bearing ring crack may be NTN bearing with the tight, bearing inner ring of foreign or loose, inclusive deformation element bearing, surface processing installation of bearing bad etc..
Through the above analysis, we now understand and know how to through the needle roller bearing noise processing problems. Finally, wish you use NTN bearings can be worry free operation.