In order to distribute the load acting on the shaft system to each supporting FYH bearing, the radial component force of each load can be obtained first, and then the vector sum can be obtained according to the direction of the component force. An example of radial load distribution is shown in Figure 5.1. In most cases, the bearing bears the radial load, and also bears the axial load, that is, bears the combined load of the two. At this time, it is converted into an equivalent dynamic load, and the value is used as the bearing load. FA u003d l2 Fl FB u003d l1 F. Distribution of bearing loads. Most of the bearings bear the combined load of radial load and axial load, and the load conditions are various, such as changes in size. Therefore, it is impossible to directly compare the actual load of the FYH bearing with the basic dynamic load rating. Therefore, the actual load is converted into an imaginary load that passes through the center of the bearing and has a certain magnitude and direction for analysis and comparison. Under this imaginary load, the bearing has the same life as the actual load and rotation speed. The hypothetical load converted in this way is called the equivalent dynamic load (P). Calculation of Equivalent Dynamic Load The radial equivalent dynamic load (Pr) of FYH radial housed bearings (including ball bearings for components) that bears a combined load of a certain magnitude and direction can be calculated by the following formula. Pru003dXFr + YFa. In the above formula, Pr: radial equivalent dynamic load, NFru003d: radial load, NFau003d: axial load, NXu003d: radial load factor (refer to Table 5.4). Y u003d axial load factor (refer to Table 5.4). Table 5.4 Radial load factor (X) and axial load factor (Y). Remarks) 1. The values u200bu200bof C0r (basic radial static load rating) and f0 (factor) are shown in the dimension table. 2. If the value of f 0 Fa / C0r does not match the above table, use the interpolation method to calculate. Average Equivalent Dynamic Load at Load Change 5.4 Basic Static Load Rating and Equivalent Static Load 5.4.1 Basic Static Load Rating ① Self-aligning ball bearings 4 600 MPa ② Other ball bearings 4 200 MPa (including assembly ball bearings) ③ Roller bearings 4 000 MPa Table 5.5 Calculation method of the average equivalent dynamic load when the load changes (1) Step change (2) Monotonic change (3) Sine change u003d Pmin + 2 Pmax Pm u003d 0.68 Pmax (4) sinusoidal change (upper half of the sinusoidal curve) in (1) to (4) Pm P1 P2 Pn Pmin : Minimum equivalent dynamic load, N Pmax Σniti : t1 to ti The total number of revolutions in time Pm u003d 0.75 Pmax When the bearing is subjected to a load that changes in size or direction, it is necessary to calculate the average equivalent dynamic load that makes the bearing have the same life as the actual changing condition. The calculation method of the average equivalent dynamic load under various changing conditions is shown in Table 5.5. : Average equivalent dynamic load, N: Equivalent dynamic load at speed n1 and action time t1, N: Equivalent dynamic load at speed n2 and action time t2, N: Equivalent dynamic load at speed nn and action time tn , N: the maximum equivalent dynamic load, when the N bearing is subjected to excessive static load or shock load at extremely low speed, the contact surface between the rolling element and the raceway will produce local permanent deformation. The amount of deformation increases with the increase of the load, and if it exceeds a certain limit, the normal rotation will be affected. The basic static load rating is the static load that generates the calculated contact stress shown below at the center of the contact surface between the rolling element and the raceway that receives the maximum load. Under this contact stress, the resulting permanent deformation of the rolling elements and raceways is about 0.0001 times the diameter of the rolling elements. The basic static load rating of the ball bearing for the assembly is expressed by (C0 r ), and its value is given in the dimension table.