Dongfeng cummins automobile front wheel bearing damage

Dongfeng cummins automobile front wheel bearing burnt - 2019 11 - 09 a type dongfeng EQ1108 car after traveling 300 km, hand to touch the front wheel hub feel hot hot. After disassembly, found that the front wheel bearing has been burning. Fault diagnosis rule out: in use, the front wheel bearing appear damage phenomenon, the reasons are as follows: (1) assembly improper adjustment. All bearings are in the product technical conditions' clearance regulation, this is normal operation of bearing axial (necessary to ensure lubrication Or radial) Clearance. Gap is too small or no gap tends to be ignored. At this time, due to the oil film between roller and raceway are destroyed, the formation of dry friction and heat, and will cause bearing damage. To this end, the car front wheel bearing adjustment method is the correct assembly, screw lock nut, rotating wheel 2 and at the same time 3 laps, joint bearing completely, and then turning the locking nut a third ring, if open slots can't align, steering knuckle nut can be to spin out a few until the alignment, load a split pin. At this point, both to ensure that the wheel can free rotation, and no obvious axial channeling and radial runout. (2) the bad lubrication. The vehicle and other series of dongfeng automobile, rolling bearing lubrication part under high quality 2 lithium grease lubrication, and require full of bearing grease inside and outside the circle, cage, and the space between the rolling element. If only on bearing surface by hand wipe on a thin layer of fat ( Can't afford to hub cavity filled with grease lubrication) , even if the assembly clearance adjusting meet the technical requirements, the car run soon, bearing between roller and raceway also can appear dry friction, bearing damage. Once the bearing rolling element and raceway loss, first of all the individual roller rotation and skew, and then will cause all skew roller, inner and outer ring card to death, make hub and bearing and steering knuckle. In this case, the steering knuckle neck fracture, also hard to avoid the wheels.