轴承载荷计算.pdf

A-46 Technical Data 6. Bearing Load Calculation Loads acting on shafts pute bearing loads, the forces which act on the shaft being supported by the bearing must be determined. These forces include the inherent dead weight of the rotating body (the weight of the shafts ponents themselves), loads generated by the working forces of the machine, and loads arising from transmitted power. It is possible to calculate theoretical values for these loads; however, there are many instances where the load acting on the bearing is usually determined by the nature of the load acting on the main power transmission shaft. . Gear load The loads operating on gears can be divided into three main types according to the direction in which the load is applied; . tangential ( K ), radial ( K ), and axial ( K ). The magnitude and direction of these loads differ according to the types of gears involved. The load calculation methods given herein are for two general-use gear and shaft arrangements: parallel shaft gears, and cross shaft gears. For load calculation methods regarding other types of gear and shaft arrangements, please consult NTN. (1)Loads acting on parallel shaft gears The forces acting on spur and helical parallel shaft gears are depicted in Figs. , , and . The load magnitude can be found by using formulas (), through (). K HP Dn KK K KK KK p t st t rt 2 s 2 at Spur gear a Helical gear b) K Helical gear = ×??=?() =?() =+ =?() 19 1 10 61 62 62 63 6 . (.) tan ( . ) tan cos (. (.) tan ( LLLLLLLL LLLLLL LLLLL LLLLLLLLLLL LLLLL ααββ 664 .) where, K t: Tangential gear load (tangential force) N K s : Radial gear load (separating force) N K r: Right angle shaft load (resultant force of tangential force and separating force) N K a : Parallel load on shaft N HP : Transmission force kW n : Rotational speed, r/min D p : Gear pitch circle diameter mm α: Gear pressure angle β: Gear helix angle Because the actual gear load also con