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The type of machinery selected for bearing structure is different
发布时间:2021-09-16浏览次数:0

Bearing structure of the selected type of machinery is not the same, the use conditions of bearings will be different, the performance requirements are not the same, but generally speaking, a shaft on the use of not less than two bearings. Moreover, in order to facilitate axial positioning, most bearings are used as fixed end bearings, and the rest are used as free end bearings. The following table lists the selection of fixed-end and free-end bearing structures. Applicable bearing Types Fixed end bearings are used for axial positioning and fixation of bearings. Bearings that can bear radial and axial loads at the same time are designed to bear bidirectional axial loads. When installing bearings, the corresponding strength should be considered according to the size of axial loads.


Deep groove ball bearing combination angular contact ball bearing double row angular contact ball bearing self-aligning ball bearing with flange cylindrical roller bearing (NUP type, NH type) double row roller bearing self-aligning roller bearing free end bearings are used to avoid the expansion of the shaft caused by temperature changes during operation, and for adjusting the axial position of the bearing. It is advisable to choose bearings that only bear radial load and the inner ring and outer ring can be separated. When non-separated bearings are used, the gap between the outer ring and the shell is generally used, so that when the shaft is telescopic, it does axial avoidance together with the bearing. It is used to avoid the expansion of the shaft caused by the temperature change during operation, and to adjust the axial position of the bearing. It is advisable to choose bearings that only bear radial load and the inner ring and outer ring can be separated. When non-separated bearings are used, the gap between the outer ring and the shell is generally used, so that when the shaft is telescopic, it does axial avoidance together with the bearing. When the bearing spacing is small and the influence of shaft expansion is small, the front or back configuration of two angular contact ball bearings or tapered roller bearings that can bear axial load is used. Adjust axial clearance after installation with nut or gasket. Deep groove ball bearing Angular contact ball bearing Self-aligning ball bearing Cylindrical roller bearing (NJ, NF) tapered roller bearing Self-aligning roller bearing for vertical shaft fixed end selection can bear radial load and axial load at the same time. When the axial load is large, thrust bearing and centripetal bearing are used together. The same free end can only bear radial load bearing, in order to avoid the expansion of the shaft. Fixed end combined angular contact ball bearing (back combined) Double row tapered roller bearing (type 37000) Thrust bearing and centripetal bearing mounting bearings are precision mechanical parts, do not open the package before installation to avoid rust. For grease lubricated bearings and bilateral oil seal or dust cover, sealing ring bearings can be installed directly without cleaning. * In the installation process of method bearings, it is necessary to master the principle that mounting force or torque can only be transmitted through the corresponding rings. When the inner ring of the mating bearing is pressed into the shaft to make it fit tightly, and the outer ring is loosely matched with the bearing seat hole, the bearing can be pressed on the shaft first, and then the shaft and the bearing are loaded into the bearing seat hole together. When pressing, a soft metal assembly sleeve (copper or mild steel) is padded on the end face of the bearing inner ring. When the bearing outer ring is closely matched with the bearing seat hole, and the inner ring is loosely matched with the shaft, the bearing can be pressed into the bearing seat hole first, then the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is closely matched 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, and the structure of the assembly sleeve should be able to hold the end face of the inner and outer ring of the bearing at the same time. Heating fit An installation method that converts a tight fit into a loose fit by heating a bearing or a bearing seat using thermal expansion. It is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before hot loading, the rings of bearings or separable bearings are put into the oil tank and heated evenly at 80-100℃, and then removed from the oil and installed on the shaft as soon as possible. In order to prevent the inner ring end face and shaft shoulder from fitting tightly after cooling, the bearings can be tightened axial after cooling. When the outer ring of the bearing is closely matched with the bearing seat made of light metal, the heating method of the bearing seat is adopted to avoid the abrasion of the mating surface. Heating tank with bearing and should be at a certain distance from the bottom of a mesh, hanging hooks in the bearings, bearing on the bottom, in case of heavy impurities into the bearing or uneven heating, fuel tank must have a thermometer, strictly control the oil temperature shall not exceed 100 ℃, in order to prevent the tempering effect, reduce the hardness of the ring. The installation of thrust bearing is generally a transition fit between the whole thrust bearing and the shaft, and the fit between the seat ring and the bearing seat hole is generally a clearance fit. Therefore, this kind of bearing is easier to install. The shaft spring of two-way thrust bearing should be fixed on the shaft to prevent rotation relative to the shaft. The installation method of bearings is generally the case of shaft rotation, so the inner ring and shaft fit for win, bearing outer ring and bearing chamber fit for clearance. * Bearing operation inspection Bearing installation to check, should ensure that the bearing installation in place, flexible rotation, no stagnation phenomenon, such as improper bearing installation, will make the bearing temperature rapidly rise and damage, even bearing stuck fracture and other major accidents. Use and storage of bearings (1) In the use of bearings, keep the surrounding environment clean, do not stick to sweat and dirt. Provisions by familiar with the use of bearings, especially need to be careful of injury, indentation, underloss, etc. In order to ensure the performance of bearings, bearings should be regularly maintained, maintained and overhauled according to the operating standards of equipment, including monitoring the running state, adding lubricants, and regular disassembly and inspection. (2) Bearings shall not be stored directly on the ground (need to be more than 30cm above the ground), avoid direct light and cold walls. In order to prevent rust, it is kept in an environment with a temperature of about 20℃ and humidity below 65%. Bearing is placed in acidic air, which is easy to rust and discolor. It is necessary to wipe bearing, shaft and shell with gloves and kapok silk.


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