Lineární vedení Schneeberger MINIRAIL - EN

87 17 L L L b F 1 L 1 L n L 2 F 2 F n Load Carrying Capacity and Service Life 17.2 Load Carrying Capacity and Service Life L = Length of the (longer) carriage in mm L b = Carriage spacing in mm Contact factor f k If multiple carriages are mounted back-to-back with minimal spacing (L b < L), an even weight distribution will be difficult to achieve due to the manufacturing tolerances of the guideway elements and mounting surfaces. Installation situations such as these can be allowed for with the contact factor f k : Number of carriages 1 2 3 4 5 Contact factor f k 1 0.81 0.72 0.66 0.62 17.2.4 Dynamically Equivalent Load P The loads (F) acting on a linear guideway system are subject to frequent fluctua- tions during operation. This set of circumstances should be taken into account when calculating service life. The varying load absorption of the guideway at varying operating conditions during the travel distance is described as being the dynamic equivalent load P. P= 3 � 1 ( F 1 3 · L 1 + F 2 3 · L 2 + ... F 3 · L ) L P = 0.7 F max P F 1 ... F n F max L L 1 ... L n = Equivalent load in N = Individual load in N during the partial travel distance L …. L n = Max. load in N = L 1 + …+ L n = Total travel during one load cycle in mm = Partial travel distance in mm of one individual load during a load cycle Total travel distance L Total travel distance L Load P Load P Stepped load Sinusoidal load