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Lubrication of joint bearings and precautions for use

by:JNSN     2021-12-24
Oil-filled joint bearings can move without oil when the load is small and low-speed, but they are generally grease lubricated and should be refilled regularly. It is recommended to shorten the refueling interval when starting. Lubricants mostly use lithium soap-based grease (NLGI consistency No. 2) containing molybdenum disulfide (MOS2). Non-oiled joint bearings are maintenance-free products and do not need to be oiled. However, filling lithium soap grease before use can ensure a longer life. In addition, filling grease around the bearing can prevent the intrusion of foreign matter and corrosion of the bearing. The number of oil holes on the inner and outer rings is shown in Table 15. Table 14   Load direction coefficient b1 Load direction load direction coefficient b1 1 0.2 (1) Must alternate Note (1) The load direction coefficient when the load is slowly alternating. If it is a rapid alternating load, it will drop rapidly. Please consult Qingdao Ruijing Electromechanical Equipment Co., Ltd. Table 15   The number of oil holes on the inner and outer rings. Bearing model oil-filled spherical plain bearings metric series GEE GEG SB, SBA GEES, GEGS SBB GEEC inch non-oil-filled spherical plain bearings metric series. Operating temperature range The operating temperature range of bearings with gaskets is -30 to 80°C. The maximum allowable temperature of a bearing without a gasket is 180°C for the oiled type and 150°C for the non-oiled type. ■Precautions for use When the shaft is designed for heavy loads, it can slide on the inner diameter surface of the shaft and the inner ring, so the hardness of the shaft needs to be above 58HRC, and the surface finish is within 0.8μmRa. In addition, since the limits of the shear stress and bending stress of the shaft are mostly below the static load capacity of the joint bearing, it is necessary to pay special attention to the strength of the shaft. The design of the bearing seat The bearing seat needs to have sufficient rigidity and not be deformed due to the load. When using the bearing housing of the shape shown in Figure 6, the bearing housing must be designed to have the following strength. Fig. 6   the shape of the bearing seat Fig. 7   stress concentration factor installation Fig. 8   the split surface and load direction of the outer ring Fig. 9   installation method Fig. 10   installation example 1 When installing this type of bearing, as shown in Fig. 8, the cut surface of the outer ring Position it at right angles to the load direction, and be careful not to load the load on the split surface as much as possible. 2 Please refer to the dimension table for the dimensions of the shoulder of the shaft and the bearing housing. 1 The load acts in the YL direction. When selecting materials, it is necessary to consider the compressive stress calculated by the following formula. σ1u003dF     (9)CD   where σ1: the maximum compressive stress acting on the inner diameter of the bearing housing N/mm2    F: load load N  C: outer ring width mm  D: outer ring outer diameter mm2 Material is selected when the load is applied in the direction of YU It is necessary to consider the compressive stress obtained by the following formula. σ2u003d F    k (10)C(DH-D)  where σ2: maximum tensile stress acting on the bearing seat N/mm F: load load NC: outer ring width and bearing seat width mmDH: bearing seat outer diameter mmD: Outer ring outer diameter mmk: Stress concentration factor (refer to Figure 7) When installing the interference side, the stress concentration factor when installing the inner ring and the outer ring at the same time split surface load load 450 451.
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