Tapered roller bearing installation fault of bearing small guard fracture

Taper roller bearings for use, maintenance, in the process of dismantling of the bearing is an important link, in many cases, tapered roller bearing in the process of installation, if improper installation will seriously damage the bearing, lead to cannot use. Such as bearing small guard fracture failure, the failure is common in bearing installation of a fault, the bearing network ( Hereinafter referred to as:) According to understand, to share tapered roller bearing undeserved cause small guard fracture during installation. 1, tapered roller bearing installation problems appeared in the process of analysis of the circular cone roller bearings to install small guard fracture, bearing failure can't use, tapered roller bearing inner ring and outer ring, cage and 16 grain of tapered roller combination. Inner circle of small side guard consecutive interval fracture, fracture part accounts for about two-thirds of the whole, fracture morphology show 'zigzag' ( See figure 1) 。 Figure 1 guard faults show 'zigzag' small side guard position of fracture and fracture in the same direction, lateral small cracks are composed of raceway groove face until the fracture development, part of fracture morphology and tapered roller end face the same size and morphology. Fracture location of surface film, fracture surface radiation pattern, in line with the characteristics of brittle fracture. Figure 2 maintains a striking trace figure 3 cage deformation in 'droplets' figure 4 cage deformation indentation bearing cage has the external force on a ( See figure 2) , keep along the tapping position severe deformation, changed from the original circular to 'water', at the same time also appeared 'depression' ( As shown in figure 3, figure 4) 。 In addition to the above abnormal, bearing no other obvious anomalies. 2, the cause of tapered roller bearing small guard fracture is what? The tapered roller bearing installation method is cold method, using the hammer and rod installation tools, such as to knock bearing, steel rod will lower in a rack or directly use the hammer knock be caused, mainly reflected in the improper operation load bearing cage with abnormal continuous impact force, cause the cage deformation guide roller impact of inner ring small guard at the same time, when the guard is beyond it can bear impact load when brittle fracture, resulting in bearing failure. 3, correct installation method of circular cone roller bearings taper roller bearing installation diagram as shown in figure 5. Will enter the journal bearing small end, by tapping on the surface of the big end, bearing installed to the specified position would be fixed. Figure 5 tapered roller bearing installation diagram according to the bearing size and use condition, at present, a lot of bearing installation installed adopt method of cold and heat two forms. Some commonly used method of cold installation auxiliary tool for bearing installation; Thermal process installation commonly used heating mode after making the bearing inside diameter expansion for installation. Installation suggestion: ( 1) Suggest user when installing a bearing, and use conditions according to the bearing size, select the appropriate assembly way, such as in cold or hot charging. When cold pack is used, should be installed using sleeve to cooperate, can effectively avoid the bearing abnormal impact other position, ensure the bearing transverse and vertical shaft neck during installation. When site cannot use socket installation, copper bar should be on the bearing inner ring, the symmetry, the circulating beating with a hammer in diameter direction, not too hard and at the same time should pay attention to don't let a location other than the bearing inner ring under impact. （ 2) Improve the installation personnel installation technology, according to the correct bearing installation requirements, to prevent bearing damage due to error especially violent actions.