Needle roller bearings are a kind of roller bearings with cylindrical rollers. They are commonly used in automobiles or motorcycles in our daily life. Needle roller bearings cannot avoid some failures in use. According to the understanding of needle roller bearings , Tell you about some common failure factors of needle roller bearings, and related methods to eliminate bearing failures. Common faults of needle roller bearings and their causes: 1. Fault form: (1) The bearing is difficult to rotate and generates heat; (2) There is abnormal sound in the bearing operation; (3) The bearing generates vibration; (4) Peeling and cracking of the inner race; (5) Peeling and cracking of the outer race; (6) The bearing raceways and rolling elements produce indentations. 2. Failure cause analysis: (1) The inspection before assembly is not careful. Bearings should be cleaned before assembly and carefully inspect the inner and outer races, rolling elements and cages of the bearings for rust, burrs, bruises and cracks; check whether the bearing clearance is appropriate, whether the rotation is brisk and free, and whether there is a sudden lock At the same time, check the size, roundness and cylindricity of the shaft diameter and bearing seat hole, and whether there are burrs or unevenness on the surface. For split bearing housings, it is required to leave a gap of 0.1mm~0.25mm between the joint surface of the bearing cover and the bearing base and the outer circular surface of the outer race to prevent “clamping” at the “tile mouth” on both sides of the outer housing. The gap caused by the “gang” phenomenon is reduced, the wear is accelerated, and the bearing is damaged prematurely. (2) Improper assembly. Improper assembly will lead to the above-mentioned various failure modes of the bearing, as well as the following situations: A. Improper coordination: The cooperation between the inner hole of the bearing and the shaft adopts the base hole system, and the cooperation between the outer circle of the bearing and the housing hole adopts the base shaft system. Generally, the shafts and bearing inner races of centrifugal pumps, centrifuges, reducers, motors and centrifugal compressors working under normal load conditions adopt J5, js5, js6, k5, k6, m6 to match, and the bearing seat hole and bearing The outer race adopts j6, J7 fit. The rotating seat ring (the inner race of most bearings is a rotating race, the outer race is not a rotating race, and a few bearings are the opposite), usually using interference fit, which can avoid the seat ring under the load. Rolling and sliding occurs on the mating surface with the housing bore.  

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