The bearing housing for rolling bearing with seat, through the selection of high-quality materials and high-strength design suitable for bearing load capacity, can be used under general conditions. However, it is necessary to study the strength of the bearing housing in advance when it is subjected to high loads and shock loads during low-speed rotation and in applications where safety is particularly required. The bearing box is designed into various shapes to adapt to various purposes, but the breaking strength will be different if the direction of the load is different. Therefore, while studying the strength of the bearing box, the installation direction of the seated bearing must also be fully studied. At the same time, according to the direction and size of the load, countermeasures such as setting up a stopper to support the bearing box are also required. In addition, the rigidity of the base and the flatness of the mounting surface also have an impact on the strength of the housing with a seat. However, in principle, with regard to the load of a seated rolling bearing, even if the strength of the bearing housing can be satisfied, it is recommended to study from the results of the bearing life calculation. The strength of the cast iron bearing housing. The mechanical parts made of gray cast iron have many excellent characteristics, but they have the disadvantage of being brittle to impact loads. Therefore, the magnitude, direction, and nature of the load must be fully considered when using it. The allowable load of the gray cast iron bearing box is obtained by considering the value of the static failure strength of the bearing box in consideration of the safety factor. The safety factor of gray iron castings against load is shown in Table 8.1. Approximate values u200bu200bof static failure strength of bearing housings of vertical housing, flange type and slider housing are shown in Figure 8.1 to Figure 8.8. Table 8.1 Safety factor (recommended) of gray iron castings Nature of load Safety factor of gray iron castings static load 4 with vibration 10 with shock 15. The strength of cast steel bearing housings When high strength is required for bearing housings for rolling bearings with seats, a cast steel bearing housing with high breaking strength and impact resistance can be selected. Cast steel vertical bearing housings (P200 sc, P300sc) have been serialized. The allowable load of the cast steel bearing box is obtained by considering the safety factor of the static failure strength of the bearing box. The safety factor for the load of steel castings is shown in Table 8.2. The approximate value of the static failure strength of the cast steel vertical housing bearing box is shown in Figure 8.2. Table 8.2 Safety factor of steel castings (recommended) Nature of load Safety factor of steel castings Static load 3 with vibration 5 with shock 10. The strength of the steel plate bearing box The steel plate bearing box has undergone precision press processing and has high rigidity, but it will be greatly deformed until it is broken under load. Therefore, the allowable load of the steel plate bearing box must ensure that the deformation of the bearing box due to the load does not hinder actual use. The allowable load of the steel plate bearing box is shown in Table 8.3. Table 8.3 Allowable load (recommended) load direction of steel plate bearing housing The allowable load radial direction of the steel plate bearing housing is approximately 1/6 of the radial basic dynamic load rating (Cr) of the bearing. The axial direction is approximately 1/18 of the radial basic dynamic load rating (Cr) of the bearing. The strength of the stainless steel bearing housing: the serialization of the stainless steel bearing housing (SP200H1, SF200H1, SFL200H1) has been realized. The allowable load of the stainless steel bearing box is obtained by considering the value of the static breaking strength of the bearing box in consideration of the safety factor. The safety factor of stainless steel parts against load is shown in Table 8.4; the approximate value of static breaking strength of stainless steel bearing housing is applicable to P200 in Figure 8.1, F200 in Figure 8.6, and FL200 in Figure 8.7. The safety factor of stainless steel parts, the nature of the load, the safety factor of stainless steel parts, static load 3 has vibration 5 has impact 10. The strength of the clean bearing box: The bearing box for the clean series is made of zinc alloy die-casting, and it deforms greatly from load-bearing to destruction. The safety factor of zinc alloy die castings against load is shown in Table 8.5; the approximate values u200bu200bof static breaking strength of bearing housings made of zinc alloy castings are shown in Figures 8.9 and 8.10. Table 8.5 The safety factor of zinc alloy die castings. The nature of the load. The safety factor of zinc die castings is static load 8 with vibration 25 and shock 20.