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One of the calculation examples for various applications of seated bearings

by:JNSN     2021-12-17
Example 1 Calculation of load distribution When radial load F1u003d1.5 kN and F2u003d4.5 kN, calculate the load acting on bearing A and bearing B. ① Use formula (5.7) and formula (5.8) to calculate the radial load F1A acting on bearing A by F1. F1A u003du0026#1048576;×u0026#1048576;1.5u003d1.0(kN) 600/900. Similarly, calculate the radial load F2A acting on bearing A by F2. F2A u003d -u0026#1048576;×u0026#1048576;1 200-900 4.5 u003d -1.5, 900. Remarks) A negative load means that the direction is upward. The radial load FA acting on bearing A is FAu003dF1A + F2A u003d 1.0 + (-1.5) u003d -0.5 (kN). ② Calculate the radial load FB acting on the seated bearing B in the same way as ①. F1Bu003d300/900×1.5u003d0.5 (kN). F2Bu003d1-200/900X4.5u003d6.0 (kN). FBu003dF1B + F2B u003d 0.5 + 6.0 u003d 6.5 (kN). Example 2 According to the calculation of the V-belt transmission load, when the V-belt drive shaft is used, the transmission power Wu003d7.5 kW, the speed nu003d300min-1, and the effective diameter of the pulley Dpu003d300 mm, calculate the bearing A and bearing B load. ① Use formula (5.2) to calculate the actual load F b acting on the pulley shaft. Take load factor fwu003d1.2 from Table 5.1, take belt factor fbu003d2.5 from Table 5.2 Fb u003d 19.1×106WDp·n·fw·fb u003d 19.1 × 1.2 × 2.5 u003d 4.78 (kN) ×106×7.5 300×300② Use formula (5.7) and formula (5.8) to calculate the load (FA and FB) acting on bearing A and bearing B. FA u003du0026#1048576;×u0026#1048576;450 4.78u003d2.15 1 000 (kN) FBu003du0026#1048576;×u0026#1048576;550 4.78 (kN)u003d2.63 1 000. Example 3 Calculation of the equivalent radial dynamic load When the radial load Fr u003d 1.5 kN and the axial load Fa u003d 0.85 kN of the vertical seat bearing UCP306J9 (bearing UC306), calculate the equivalent radial dynamic load Pr. ① Use UCP306J (bearing UC306) radial basic static load rating C0r u003d 15.0 kN and Table 5.4 to calculate the radial load factor (X) and axial load factor (Y). X u003d0.56 Y u003d1.68 Use formula (5.9) to calculate the radial equivalent dynamic load Pr. Pru0026#1048576;u003d XFr+YFau0026#1048576;u003d0.56 ×u0026#1048576;1.5 +u0026#1048576;1.68 ×u0026#1048576;0.85u003d 2.27 (kN).
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