By NTN needle bearing running noise analysis in the process of failure

NTN bearing failure is often the case in the process of operation, so you don't have a cow. Malfunctioned, judgment and processing is the key. Today we explain common breakdown and the method of bearing. Needle roller bearing temperature reasons: lubricating oil quality does not conform to the requirements or metamorphism, lubricating oil viscosity is too high; The assemble tight ( Inadequate clearance) ; Bearing assembly too tight; Bearing race in internal rotation shaft or housing; Too much load; Bearing cage or rolling body fracture, etc. Led to the shaft axis deviation from the correct position, when high speed movement produces sound. When the bearing fatigue, its surface metal flake, also can make NTN bearing radial clearance increases produce sound. In addition, the needle roller bearing lubrication, dry friction, and bearing broken etc all make abnormal noise. Bearing wear loose after kuang, maintains a looseness damage, also can produce sound bearing damage. The first bearing manufacturing related noise: here include maintain aircraft noise and tremolo, maintains a noise occurs mainly in ball bearings and NTN bearing, when bearing rotation due to the vibration of the cage with roller and cage impact makes a noise. The sound is cyclical. Tremolo ( All kinds of bearing) There is a certain frequency of sound, is due to large raceway surface waviness caused by vibration. This kind of phenomenon is the most common problems, we need more attention to. Especially our students are learning some knowledge of needle roller bearing, want to have a closer look at these key content, may have some help to you. Secondly noise caused by the improper use of the various kinds of bearings for all exist. When the NTN bearing raceway surface or roller surface is damaged, pit, rust, so can produce a certain cycle of noise and vibration. When bearing in operation will produce contamination noise have dust intrusion. This noise is cyclical, also with vibration, its sound size is not fixed, sometimes no. Inherent noise: the third race with all kinds of bearings and rolling friction is rolling bearing inherent noise, raceway is by the elastic properties of the rolling element and raceway contact, when the NTN bearing rotating roller rolling on the rolling and send out the voice of a continuous and smooth; Abnormal sound of rolling friction can be issued a 'tickle, tickle' uncomfortable metal friction abnormal sound, good lubrication, won't make such a sound. So in general is not a problem, only need to pay attention to increase noise after. NTN bearing raceway and roller contact surface appear uneven pits, bearing produce plastic deformation. The reason is bearing under static load or shock loading, local stress exceeds the yield limit of material on the surface of the work, this kind of situation usually happened in the low-speed rotation of needle bearing. Cause crack of the bearing race may be NTN bearing fit tight, loose foreign or bearing inner ring, bearing deformation, inclusive of installation of bearing surface processing etc. Through the above analysis, now everyone understand and know how to through the needle roller bearing noise processing problem. Finally wish everyone can use NTN bearing maintenance.