SELECTION OF THE BEARING

When choosing bearing for the machine’s unit you should take into account the value and direction of load, its type, frequency of the rings rotation; required durability; operational environment; working temperature; specific requirements for the unit defined by the machine design and conditions of its operation.

To improve the compactness of bearing units and to reduce their weight (as well as the weight of machines and mechanisms in general) you should not overestimate lifetime of bearings, as a rule, higher than the calculated one. In addition, the friction moments, energy losses and limit rapidity of the bearings of heavier series are less favorable.

To select type and size of the bearing, you should calculate the equivalent load (for the given radial and axial loads) as the load, providing at the given speed the same durability of the bearing as at operating conditions. Durability of the bearing is determined based on the contact endurance of the bearing working surfaces. It is generally impossible to calculate if the bearing will brake down for some reasons not related to contact fatigue.

Using the following calculated dependencies you can find the required dynamic load capacity of the bearing (taking into account the specified loads and speeds, provide the required durability). The load capacity depends on the size of bearing, its design and material. According to the found value S you can choose a specific size of the bearing and its dimensions.