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Bearing as locomotive of main parts, especially traction motor, and axis box bearing, its features on security transport up with important of role, locomotive online Shang run Shi, once bearing occurred fault, will led to whole column train cannot run, plug transport are line, especially passenger train occurred fault, caused of negative effect on more large, while once locomotive bearing occurred fault, on locomotive of repair work is being urgently is is difficulties of, therefore prevention and reduced locomotive bearing fault of occurred, for locomotive of security transport on is is important, Can in front of the bearing load bearing of hidden fault detected, TIMKEN bearings guarantee qualified parts train is the focus of this discussion.
TIMKEN bearing of serious damaged often not single of causes caused of, but in several area integrated role Xia, in bad of run conditions Xia produced vicious circle, led to bearing of serious burn loss, therefore in accident occurred Hou, often is difficult to judgment is by what causes due to, also on to we developed related of measures brings must of difficulties, for discussion convenient, first from several area for analysis bearing occurred fault of causes.
When TIMKEN bearing to use after a period of time, bearing inner ring, rolling elements and cage, outer ring, roller etc have some defects, injuries and cause poor lubrication of the bearings, bearing caused by fever, fever for a long time, resulting in:
(1) bearing lubricant dilution.
(2) accelerate material fatigue, decline in hardness. For these reasons, further form a vicious circle, accelerate overheating and burning of the TIMKEN bearing. Serious displacement of the inner ring of the bearing and rolling Out-of-round, impact heat, weld together eventually. When running on online if bearing serious heat, the smoke, don't stop, run to the front should be maintained, because the overheated bearing at the moment is in the melt State, once stopped cooling after it is no longer able to walk, plug the line.
On locomotive bearing of to oil maintenance is important, especially to bearing moderate of refueling can guarantee bearing has good of lubrication role, deficiency oil and refueling too much also are is easy caused bearing fault, oil plus less has easy caused bearing lubrication bad and fever, plus more has also easy caused mixing overheating, therefore in maintenance in the to oil to appropriate, while bearing of lubricant fat of clean also is important, once oil in the off into other of impurities and water, will effect normal of tour gap and established must of oil film.
TIMKEN bearings used for a long time, over the bearing service life, easily lead to material fatigue, coupled with the strong impact of the material deformation, rollers, rolling and milling pavement split, resulting in poor lubrication and vibration increases.
Clearance of the bearing inner ring and shaft of interference, and can easily cause bearing failure, interference, it is likely to cause the bearing inner ring cracked due to excessive tensile stress, interference is too small, and very likely to cause the bearing inner ring "flaccid."
TIMKEN bearing assembled tie tour gap tie improper, also easy caused bearing fault, tour gap small is easy caused roll child and roll road friction fever, as temperature of continued rose, bearing within ring, and scroll body, and maintained frame, and outer ring, and end cover of temperature does not same, mutual Zhijian exists with temperature, thus expansion volume also slightly has different, also on caused tie gap of further reduced, plus according to bearing of health hot. Clearance is too large, increased vibration of roller, roller and the Raceway's impact, but also prone to uneven load distribution, bearing rollers reduce the Central roller load is too large.
When assembling bearings not complying with the technical requirements, with copper hammer shock bearings, causing cage deformation, inner and outer rings of traction motor bearing is not properly installed or axial PT disappear for other reasons, resulting in TIMKEN bearing sinter.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7921A5DF NSK | 105 | 145 | 20 |
| NNU4956K NTN | 280 | 380 | 100 |