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Detailed description of key steps in SKF bearing installation

by:JNSN     2022-03-16
Friends who often use SKF bearings know that the quality of SKF bearing installation will affect the accuracy, life and performance of SKF bearings. Therefore, please fully study the installation of SKF bearings, that is, please follow the steps including the following items to install SKF bearings. (1) Cleaning of SKF bearings and related parts For grease-lubricated SKF bearings and oil seals or dust covers on both sides, the sealing ring SKF bearings do not need to be cleaned before installation. (2) Check the dimensions and finishing conditions of relevant parts (3), Installation method The installation of SKF bearings should be determined according to the SKF bearing structure, size and the matching nature of SKF bearing parts, and the pressure should be directly applied to the tight fitting sleeve. On the end face of the ring, the pressure shall not be transmitted through the rolling elements. The SKF bearing installation generally adopts the following methods: A. Press-fit the SKF bearing inner ring and the shaft to make a tight fit. When the outer ring and the SKF bearing seat hole are loosely fitted, a press can be used. Press-fit the SKF bearing on the shaft first, then put the shaft together with the SKF bearing into the hole of the SKF bearing seat. When press-fitting, on the end face of the inner ring of the SKF bearing, a soft metal material assembly sleeve (copper or soft Steel), the inner diameter of the assembly sleeve should be slightly larger than the journal diameter, and the outer diameter should be slightly smaller than the SKF bearing inner ring rib to avoid pressing on the cage. The outer ring of the SKF bearing is tightly fitted with the hole of the SKF bearing seat. When the inner ring and the shaft are loosely fitted, the SKF bearing can be pressed into the hole of the SKF bearing seat first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the SKF bearing ring is tightly fitted with the shaft and the seat hole, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time. . B. Heating fit By heating SKF bearings or SKF bearing housings, thermal expansion is used to convert a tight fit into a loose fit. It is a common and labor-saving installation method. This method is suitable for the installation of SKF bearings with large interference. Before shrink-fitting, put the SKF bearing or separable SKF bearing ring into the oil tank and evenly heat it at 80-100°C, then take it out of the oil and install it on the shaft as soon as possible. In order to prevent the inner ring end face and the shaft shoulder from not fitting tightly after cooling, the SKF bearing can be axially tightened after cooling. When the outer ring of the SKF bearing is tightly fitted with the SKF bearing seat made of light metal, the hot-fitting method of heating the SKF bearing seat can be used to prevent the mating surface from being scratched. When heating the SKF bearing with the oil tank, there should be a mesh grid at a certain distance from the bottom of the box, or use a hook to hang the SKF bearing. The SKF bearing cannot be placed on the bottom of the box to prevent heavy impurities from entering the SKF bearing or uneven heating. There must be a thermometer, and the oil temperature should not exceed 100 ℃ strictly to prevent the tempering effect and reduce the hardness of the ferrule. C. Installation of tapered bore SKF bearings Tapered bore bearings can be directly mounted on the tapered journal, or on the tapered surface of the adapter sleeve and withdrawal sleeve, and the tightness of the fit can be reduced by the radial clearance of the SKF bearing Therefore, the radial clearance of SKF bearings should be measured before installation. During installation, the clearance should be measured frequently to achieve the required clearance reduction. Generally, lock nut installation is used during installation, and heating can also be used. method of installation. D. Installation of thrust SKF bearings The overall fit of the thrust bearing and the shaft is generally a transition fit, and the fit between the seat ring and the SKF bearing seat hole is generally a clearance fit, so this SKF bearing is easier to install, and the center shaft of the two-way thrust SKF bearing The spring should be secured on the shaft to prevent rotation relative to the shaft. The installation method of SKF bearings is generally the case where the shaft rotates, so the fit between the inner ring and the shaft is a win-win fit, and the fit between the outer ring of the SKF bearing and the SKF bearing chamber is a clearance fit.
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