ETP Hub-Shaft Connections - ETP - #29

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o (N/mm2) 300 200 100 0 1,0 1,2 1,4 1,6 1,8 2,0 2,2 2,4 o (N/mm2) 300 200 100 0,1 0,3 0,5 0,7 di/d ReL = Yield point for the material. E = Module of elasticity. DH = The minimum outer diameter of the hub. di = The maximum inner diameter of the hollow shaft. o = Effective stress. For other notations see figure on page 27. If DH/D 0,6 for the hollow shaft, contact us for advice. For all materials there will be an elastic expansion/ compression of the hub/hollow shaft. The expansion/compression will not be uniform of the hub/ hollow shaft if the material is unsymmetrical. For accurate calculation contact us. Technical information 29 Dimensioning of hub and hollow shaft For ETP-HYLOC and ETP-OCTOPUS see information under the corresponding product section, the information below is not valid for these. Because of the even and reasonable surface pressure and the compact built-in dimensions of the ETP connections, a thin material in hub and shaft can be used. Also aluminium can be used. For hubs and hollow shafts in steel, the yield point of those decides the thickness of the material. For cast iron and aluminium the module of elasticity is decisive. The requisite thickness can be selected from the table or more accurately in the diagram. Material DH/D Steel incl. stainless, ReL>300 N/mm2 1,4 Steel incl. stainless, ReL>220 N/mm2 1,5 Cast iron, E=120 kN/mm2 2,0 Aluminium, E=70 kN/mm2 2,5 HUB Material di/d Steel incl. stainless, ReL>300 N/mm2 0,6 Steel incl. stainless, ReL>240 N/mm2 0,5 Cast iron, E=120 kN/mm2 0,3 Aluminium, E=70 kN/mm2 0,2 HOLLOW SHAFT Runout and balance The hydraulic ETP principle assures a good runout and balance. All products are balanced by design. For guide values see the table. To these values the runout/unbalance for shaft and hub in the actual case has to be added in order to get the final value when mounted. Dynamic balancing can be done on request. ETP-EXPRESS and ETP-TECHNO can be dynamically balanced to G 2,5 on request. ETP-EXPRESS ETP-TECHNO ETP-CLASSIC ETP-MINI ETP-HYLOC incl. type R and C incl. type R incl. type R Runout (mm)* < 0,02 0,006 0,03 – 0,06 0,02 0,01 – 0,02 Unbalance (gmm/kg) 75 50 100 100 75** * Values are also valid after repeated mountings. ** For size 100 mm, with radial mounted steel plugs, the unbalance is larger. DH/D