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Calculation of dynamic bearing loads

Date锛2013-10-11 9:14:39

Acting on the bearing load at known or calculable under external force (such as driving force, work forces or inertia forces) can be calculated according to principles of mechanics. When calculating bearing loads of separation, in order to simplify the calculation, shaft is seen as rigid and powerlessness of beams made from the fulcrum of action at a distance. Bearing and housings or the elastic deformation of machine structure, shaft deflection resulted in bearing effective moments, nothing about the simplified calculation.
Apply simplified theory, only a simple auxiliary tools, such as calculators, can also be calculated. In fact, calculate the equivalent bearing loads and basic rated load standard methods are based on similar assumptions.
Sophisticated and complex calculation program, without the above assumptions, elasticity theory, rather than to calculate bearing loads. In the course of these calculations, bearings, shafts and housings are to be taken into account in the system of flexible parts
Forces aspects include axis and by hosted parts inherent of weight, or vehicles of weight and other inertia force,, these General are is known, or can through calculation came, but other of forces, as work in (ran over pressure and machine tool of cutting force,), and impact and additional of dynamic force (as due to not balance caused of centrifugal force), usually to relies on similar and or bearing configuration of experience to determines.
Gear transmission
Gear, gear generating force can in theory according to the transmitted power and the type of gear to figure out. But there are other dynamic forces or output from the gear, the transmission end. In addition, the unbalance of rotating parts and gear shape error can also cause additional dynamic forces. But to generally high standards of precision of gear manufacturing in order to reduce the noise when running, so this causes is usually very small, in the calculation of the bearing load is negligible.
Gear drive and its only known case in working conditions, can be determined on the basis of the additional force of movement forms and patterns. According to different working conditions, gear manufacturers usually provide a shock load and gear efficiency of "work" factor, this factor can be used to consider the impact of additional force on bearing life.
Belt drive
When calculating the bearing load of the belt drive, most notably take into account the effective belt pull, depending on the passing moment. Belt manufacturers usually depending on the type of belt type, preload, belt tension and other additional dynamic forces, provide a device to calculate the coefficient of belt tension. Where it is not possible to get the relevant coefficients, you can use the following reference values:
1, toothed belt =1,1 to 1,3
2, v-belts (v-belts) =1,2 to 2,5
3, flat belt =1,5 to 4,5
When the distance between the axis is very short, in heavy load or under the effect of shock loading, or tension is very large, it should be taken with a larger value.

 

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