locking assemblies

More documents

Recommendations

Info

Shaft-Hub ConnectionsTraditional MethodsFig.1: shaft failure due to fatigue crack(heat treated steel C45)Keyway and splined <strong>locking</strong> systems show important disadvantages, in particular underoverload and frequent torque reversal conditions. Connected parts undergo micromovements which cause them damage. The notch of keyway seat is a stress concentratorwhich reduces the fatigue strength. The figures show some fatigue failures fractographs ofnotched shafts (courtesy of ASM International, Metals Handbook, vol 9).Keyways and splines are eliminated byforced fit systems (pressing, heating), wherehigh radial pressures are generated due toshaft - hub interference. A backlash freecoupling is obtained. In addition, sectionsof shafts and bearings can be reduced and,as a consequence, also costs. But this kindof connection shows difficulties during themounting-dismantling steps.Fig.2: fatigue problem caused by torsionFig.3: typical fatigue fracture4LOCKING ASSEMBLIES
Shaft-Hub ConnectionsThe MAV SystemThe MAV Locking Devices meet both the advantages of forced fit systems and simplifiedinstallation-removal. It is based on the wedge principle: the axial load of the screwsgenerates through the tapers a high radial force that locks the parts by friction.The main features of MAV Locking Devices are:· shaft - <strong>locking</strong> device - hub tolerances are sufficient for easy mounting and correctpositioning· high manufacturing precision permits close geometrical tolerances, leading to a wellbalanced coupling, also for high speed conditions· high pressures let high torque to be trasmitted, also in addition with bending moment;fretting corrosion is eliminated· absence of notches results in enhanced static and dynamical strength, leading tolighter and more cost-effective designs· the large variety and the possibility of designing and manufacturing customized unitslet to find the best solution for any kind of specificationsLOCKING ASSEMBLIES 5
Page 1 and 2: L O C K I N G A S S E M B L I E SSh
Page 3: Index456-78-910-1314-1516-1718-1920
Page 7 and 8: MAV Locking AssembliesThe following
Page 9 and 10: Steel mill gear connected with spec
Page 11 and 12: Radial loadRadial loads are usually
Page 13 and 14: If the hub has a different configur
Page 15 and 16: Standard Series MAV 1062Example of
Page 17 and 18: Standard Series MAV 2005LL1ØdCompo
Page 19 and 20: Standard Series MAV 3003LØdØDExam
Page 21 and 22: Standard Series MAV 4061DIMENSIONS
Page 23 and 24: Standard Series MAV 1008DIMENSIONI
Page 25 and 26: Standard Series MAV 5061dmm x DmmDI
Page 27 and 28: Standard Series MAV 6902Example of
Page 29 and 30: Standard Series MAV 6002L3Compositi
Page 31 and 32: Standard Series MAV 6903DIMENSIONS
Page 33 and 34: Standard Series MAV 1261dmmdinchxDm
Page 35 and 36: Technical SupportData of applicatio

locking assemblies

Create successful ePaper yourself

Delete template?

Save as template?