Operating temperature range The operating temperature of the FYH rolling bearing with a block depends on the type of grease used in the bearing, the rubber material of the oil seal, and the internal clearance of the bearing. In addition to ordinary FYH rolling bearings with a block, heat-resistant components (special symbol D1K2) and cold-resistant components (special symbol D2K2) have also been serialized, and bearings that are most suitable for the operating temperature can be selected (see Table 2.3). However, even if a bearing with a house that is most suitable for the operating temperature is selected, since the life of the grease is greatly affected by the temperature, it is necessary to replenish the grease according to the specified standards. When the operating temperature and the internal clearance of the FYH bearing have high heat conduction to the shaft or the hollow hole of the shaft passes through high-temperature steam, the temperature difference between the inner ring and the outer ring of the bearing becomes larger, which reduces the internal clearance of the bearing and causes the bearing to be damaged early. Danger. According to the temperature difference between the inner ring and the outer ring of the bearing, the reduction in the internal clearance of the bearing can be calculated by formula (7.1). When working under the above conditions, it is necessary to calculate the reduction of the internal clearance of the bearing and correctly select the internal clearance of the bearing. St1u003dDe In the above formula, St1: the reduction of the internal clearance due to the temperature difference between the inner ring and the outer ring of the bearing, mm: the linear expansion coefficient of the bearing steel, 12.510-6De: the diameter of the raceway of the outer ring of the bearing, mm Diameter series 2, X⋯⋯De ≈ 0.92 DDiameter series 3u0026#1048576;u0026#1048576; u0026#1048576;De ≈ 0.9 DD: nominal outer diameter of bearing, mmt: temperature difference between the inner ring and outer ring of the bearing, °C. When FYH rolling bearing with house is used at high temperature, in addition to the internal clearance of the bearing, sometimes the shaft is elongated in the axial direction due to the temperature, and an abnormal axial load is applied to the bearing, which will also cause early damage to the bearing. The countermeasure is to make the shaft as the free end assembly or the assembly itself able to move in the axial direction (refer to the design of 9 shafts and bases).