Basic static load rating and equivalent static load of FYH housed bearings

Basic static load rating and equivalent static load of FYH bearing with house: When the basic static load rating 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 total 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. Equivalent static load refers to an imaginary load. When the FYH bearing with a block is stationary or the rotation speed is extremely low, the center of the contact surface between the rolling element and the raceway that bears the maximum load under the imaginary load produces the same contact stress as that under the actual load condition. . The radial equivalent static load (P0 r ) of the FYH ball bearing with seat for assembly can be calculated by the following formula (take the larger value). P0r u003d 0.6Fr + 0.5 Fa P0r u003d Fr. In the above formula, P0r : Equivalent radial static load, N Fr : Radial load, N Fa : Axial load, N. Safety factor: The allowable equivalent static load of the bearing depends on the basic static load rating of the bearing. However, as the performance requirements of the bearing and the service conditions of the bearing are different, the bearing service limit determined by the above-mentioned permanent deformation amount (local dent amount) will change. Therefore, in order to analyze the safety of the basic static load rating, a safety factor was established based on past experience. f su003d: Safety factor (refer to Table 5.6) C0r: Basic radial static load rating, NP0r: Radial equivalent static load, N. Table 5.6 Safety factor fs (recommended) Conditions of use (minimum) General rotation and rotation accuracy requirements 2 General use conditions 1 Shock load 1.5 General use conditions 0.5 Shock load or uneven partial load 1 P0r u003d 0.6Fr + 0.5 Fa u003d 0r 0r Spins infrequently and sometimes wobbles.