The loads acting on the seated bearing include the weight of the bearing support, the transmission power of gears or belts, and the load generated during machine operation. Since most of the bearing load changes, and the degree or size of the change is difficult to determine, it is almost impossible to determine the bearing load through simple calculations. Therefore, the calculation of bearing load generally adopts the method of multiplying the theoretical calculation value by the empirical coefficient. Although the radial load or axial load acting on the bearing can be calculated according to the general mechanics method, the actual load acting on the bearing is often larger than the calculated value due to mechanical vibration or shock. Therefore, when calculating Generally, the theoretical calculation value is multiplied by a load factor related to mechanical vibration or shock, as shown in the following formula. F u003d ·Fc In the above formula, F: actual load acting on the bearing, N f w: load factor (refer to Table 5.1). Load during belt or chain transmission The theoretical load acting on the pulley shaft during belt or chain transmission can be obtained by calculating the effective transmission force of the belt. However, when calculating the actual load, it is necessary to multiply the effective transmission force by the load factor (f w) that takes into account the vibration and impact of the mechanical movement and a factor (f b) related to the belt tension. In addition, the chain drive also needs to be multiplied by a chain coefficient equivalent to the belt coefficient. Fb u003d ·fw·f b2Dp19.1×106WDp·n u003d ·fw·fb where Fb: the actual load of the belt pulley shaft or sprocket shaft, NM: the torque of the pulley or sprocket, mN·mWDp: the pulley or sprocket Pitch circle diameter, mmn: Rotation speed, min-1 fwf b② Radial load of the gear (separation force) ③ Combined load of the gear Fb u003d ·fw·f b2Dp 19.1×106W Dp·nu003d ·fw·f b19.1×106 W Dpn t u003d u003d 2 MD Kr u003d Kt tan Kg u003d Kt 2 + Kr 2 u003d Kt sec where Kt: tangential load (tangential force) of the gear, NKr: radial load (separation force) of the gear, NKg: gear NM: Gear torque, mN·mDp: Gear pitch circle diameter, mmW: Transmission power, kWn α: Rotation speed, min-1: Gear pressure angle, °Fg: Actual gear load, NKg ：Theoretical gear combined load, Nf w Table 5.3 Gear factor fg Gear type Precision gear 1～1.1 General gear 1.1～1.3Fg u003d Kg: Bearing transmission power, kW: Load factor (refer to Table 5.1): Belt (chain) factor (refer to Table 5.2) However, when calculating the actual gear load, it is also necessary to multiply the theoretical load by the load factor (fw) that takes into account the vibration and impact of the machine operation and a gear factor (fg) related to gear accuracy. fg: load factor (refer to table 5.1): gear coefficient (refer to table 5.3) fg (tooth pitch error and tooth profile error are less than 0.02mm) (tooth pitch error and tooth profile error are both less than 0.1mm) 5 bearing load fw·fg ·P 5.1.3 Load table during gear transmission 5.2 Belt (chain) coefficient fb belt type 1.3 ～22 ～2.52.5 ～34 ～5 chain 1.2 ～1.5 fb toothed belt V-belt flat belt (with tension pulley) . The theoretical load acting on the gear during gear transmission includes tangential load (K t), radial load (K r) and axial load (K a). According to the transmission force of the gear and the type of gear, it can be calculated by mechanical methods. . Take the most general spur gear as an example here (there is no axial load in the spur gear).