Needle roller bearing is a kind of roller bearing with cylindrical roller, our daily life is commonly used in cars or motorcycles, etc., that needle roller bearing in use is inevitably some failure, according to the understanding of needle roller bearings, tell you about some common failure factors of needle roller bearings, and related to eliminate bearing failure methods. Needle roller bearings common failures and their causes. 1. fault form. (1) bearing rotation difficulties, heat. (2) bearing operation with strange sound. (3) bearing vibration. (4) inner seat ring peeling, cracking; (5) outer seat ring peeling, cracking. (5) outer seat ring spalling, cracking. (6) bearing raceway and rolling body indentation. 2. Analysis of the causes of failure. (1) Inspection before assembly is not careful. Before assembling the bearings should be cleaned and carefully check the inner and outer seat ring, rolling body and cage, whether there is rust, burrs, bruises and cracks; check whether the bearing clearance is appropriate. Whether the rotation is light and free, there is no sudden card stop phenomenon; At the same time check the shaft diameter and bearing seat hole size, roundness and cylindricity and its surface whether there are burrs or four convex inequality. For the open bearing seat, require the bearing cover and bearing base joint surface and the outer ring of the outer circle between the surface, should leave 0.1mm ~ 0.25mm clearance, in order to prevent the outer seat on both sides of the “tile mouth” at the “clip help” phenomenon resulting in the reduction of clearance, wear Speed up, so that the bearing premature damage. (2) Improper assembly. Improper assembly will lead to the above-mentioned forms of bearing failure, as well as the following situations. A. Improper fit. Bearing bore and shaft fit with the base hole system, bearing outer circle and bearing seat hole fit with the base shaft system. Generally in the normal load conditions of the work of the centrifugal pump, centrifugal machine, reducer, motor and centrifugal compressor shaft and bearing inner seat ring, using J5, js5, js6, k5, k6, m6 with, bearing seat hole and bearing outer seat ring using j6, J7 with. Rotating seat ring (most of the bearing inner seat ring for rotating seat ring, outer seat ring not for rotating seat ring, a small number of bearings are the opposite), usually using interference fit, can avoid the seat ring under load in the shaft diameter and bearing seat hole of the mating surface rolling and sliding. But sometimes due to the shaft diameter and bearing seat hole size measurement inaccurate or fit surface roughness does not meet the standard requirements, resulting in too large interference fit, so that the bearing seat ring by a large squeeze, resulting in the bearing itself to reduce the radial clearance, so that the bearing rotation difficulties, heat, increased wear or jamming, serious will cause the bearing inside and outside the seat ring in accordance with the installation of cracking. Do not rotate the seat ring often use clearance or interference is not large fit, so do not rotate the seat ring is likely to produce a small creep, and seat ring and rolling body contact surface constantly replaced, seat ring raceway wear uniform. Also can eliminate the shaft due to thermal elongation and make the bearing in the rolling body of the phenomenon of axial jamming. But too large a gap with, will not rotate the seat ring with the rolling body rotation, resulting in the shaft (or bearing seat hole) and the inner seat ring (or outer seat ring) serious wear, and friction so that the bearing heat, vibration. B. Improper assembly method. When the bearing and shaft diameter or bearing seat hole interference is small, the press-in method is mostly used. The simplest method is to use brass rod and hand hammer, in a certain order, symmetrically knock the bearing with interference with the seat ring, so that the bearing is smoothly pressed into. In addition, can also be used to soft metal casing by hand hammer or pressed into the press. If the operation is not proper, it will make the seat deformation and cracking, or hand hammer hit in the non-perfection with the seat, it will make the raceway and rolling body indentation or bearing indirectly destroyed. C. improper temperature control during assembly. Needle roller bearing in the assembly, if its interference with the shaft diameter is large, the general use of hot installation method assembly. The bearing is put into the oil barrel with oil, and the outside of the oil barrel is heated with hot water or flame. The process requires the oil temperature to be heated at 80℃~90℃, usually not more than 100℃, at most not more than 120℃. The bearings are quickly removed and set on the journal after heating. If the heating temperature is too high due to improper temperature control, the bearings will be tempered and the hardness will be reduced, and the bearings will be easily worn, spalled or even cracked during operation.  

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