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Detailed description of the key steps of bearing installation

by:JNSN     2021-12-25
Friends who often use bearings know that the quality of the bearing installation will affect the accuracy, life and performance of the bearing. Therefore, please fully study the bearing installation, that is, please follow the steps including the following items to install the bearing. (1) Cleaning the bearings and related parts    For grease lubricated bearings and oil seals or dust caps on both sides, the seal ring bearing does not need to be cleaned before installation. (2) Check the dimensions and finishing conditions of the relevant parts (3) Installation method The installation of the bearing should be based on the bearing structure, size and the matching nature of the bearing components, and the pressure should be directly applied to the end face of the tightly-fitted ring , Do not transmit pressure through the rolling elements. Bearing installation generally adopts the following methods: A. Press-fit the inner ring of the bearing to make a tight fit with the shaft. Then put the shaft and the bearing into the bearing housing hole. During press-fitting, padded an assembly sleeve made of soft metal material (copper or mild steel) on the end face of the inner ring of the bearing. The inner diameter of the assembly sleeve should be larger than The journal diameter is slightly larger, and the outer diameter should be slightly smaller than the bearing inner ring rib to avoid pressing on the cage. The outer ring of the bearing is tightly fitted with the bearing seat hole. When the inner ring and the shaft are loosely fitted, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is tightly fitted with the shaft and the seat hole, the inner ring and outer ring must be installed into the shaft and the seat hole at the same time. The structure of the assembly sleeve should be able to press the end faces of the inner ring and the outer ring at the same time. B. Heating fit     By heating the bearing or bearing seat, the use of thermal expansion to transform the tight fit into a loose fit installation method. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Put the bearing or separable bearing ring into the oil tank and heat it evenly at 80-100°C before hot assembling, and then take it out of the oil and install it on the shaft as soon as possible. To prevent the inner ring end face and the shaft shoulder from not fitting tightly after cooling, the bearing can be axially tightened after cooling. When the outer ring of the bearing is tightly fitted with the light metal bearing seat, the hot fitting method of heating the bearing seat can be used to avoid scratches on the mating surface. When heating the bearing with an oil tank, there should be a grid at a certain distance from the bottom of the box, or the bearing should be hung with a hook. The bearing cannot be placed on the bottom of the box to prevent sinking impurities from entering the bearing or uneven heating. There must be a thermometer in the oil tank. Strictly control the oil temperature not to exceed 100°C to prevent the occurrence of tempering effects and reduce the hardness of the ferrule. C. Installation of tapered bore bearings. Tapered bore bearings can be directly installed on the tapered journal, or on the tapered surface of the adapter sleeve and withdrawal sleeve. The tightness of the fit can be determined by the reduction in the radial clearance of the bearing. Therefore, the radial clearance of the bearing should be measured before installation, and the clearance should be measured frequently during the installation process to achieve the required clearance reduction. The installation is generally done with a lock nut, or it can be installed by heating. . D. Thrust bearing installation The fit of the thrust bearing and the shaft is generally a transition fit, and the fit between the seat ring and the bearing seat hole is generally a clearance fit, so this kind of bearing is easier to install. The upper is fixed to prevent rotation relative to the shaft. Generally speaking, the installation method of the bearing is that the shaft rotates. Therefore, the fit between the inner ring and the shaft is an over-win fit, and the fit between the outer ring of the bearing and the bearing chamber is a clearance fit.
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