Lineární vedení Schneeberger MINIRAIL - EN

85 17 Load Carrying Capacity and Service Life 17.1 Load Carrying Capacity and Service Life 17.1 Principles The load capacities are based on the principles of DIN 636. In accordance with DIN in most applications a permanent overall deformation of 0.0001 times the rolling element diameter can be permitted without adversely affecting the operating behaviour of the bearing. Consequently, the static load capacity C 0 is set sufficiently high that the aforementioned deformation occurs approximately when the equivalent static load corresponds to the static load capacity. Being guided by the dynamic load capacity C is recommended so that the aforementioned overall deformation does not occur. The dynamic load capacity C is the load at which a nominal service life L of 100 km of travel distance is achieved. It is important to note when calculating the service life that not only the load, which acts vertically on the guideway, should be taken into account but also the load spectrum of all acting forces and moments. The service life corresponds to the total travel distance in meters which a guideway facilitates. And this is before any noticeable material fatigue on one of the roller guideway elements. The nominal service life is achieved when 90% of the guideways of identical construction reach or exceed the corresponding travel distances under normal operating conditions. Critical for the dimensioning of the guideways are the loads occurring proportionally with the dynamic load capacity C. Definition of service life As previously mentioned, the dynamic load capacity C 100 is based on a service life of 100 km. Other manufacturers frequently indicate the load capacity C 50 for a service life of 50 km. The resulting load capacities from this are more than 20% higher than specified by the DIN ISO standard. Conversion example for ball bearings Convert C 50 load capacities to C 100 in accordance with the DIN ISO standard: C 100 = 0.79 ∙ C 50 Convert C 100 load capacities to C 50 : C 50 = 1.26 ∙ C 100 C 50 C 100 = dynamic load capacity C in N for 50 km of travel distance = dynamic load capacity C in N for 100 km of travel distance, defined in accordance with DIN ISO standard