Locking Assemblies ■ Shrink Discs ■ Rigid Couplings

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Shaft-Hub Connections: Traditional Methods Shaft-Hub Connections: The MAV System Installation Instruction for Mini Locking Assemblies Installation Instruction for Mini Rigid Couplings Installation Instruction for Mini Shrink Discs Technical Support This catalogue contains complete information for the new MAV Mini Series line of Keyless Shaft-Hub Locking Devices. The following pages will help you to nd the perfect solution for your application. Should you require assistance with an application, please feel free to contact MAV technical support. Our engineers will be pleased to provide any information...

Shaft-Hub Connections Traditional Methods Fig.1: shaft failure due to fatigue crack (heat treated steel C45) Keyway and splined locking systems show important disadvantages, in particular under overload and frequent torque reversal conditions. Connected parts undergo micro movements which cause them damage. The notch of keyway seat is a stress concentrator which reduces the fatigue strength. The gures show some fatigue failures fractographs of notched shafts (courtesy of ASM International, Metals Handbook, vol 9). Keyways and splines are eliminated by forced t systems (pressing, heating), where...

Shaft-Hub Connections The MAV System The MAV Locking Devices meet both the advantages of forced t systems and simplied installation-removal. It is based on the wedge principle: the axial load of the screws generates through the tapers a high radial force that locks the parts by friction. The main features of MAV Locking Devices are: · shaft - locking device - hub tolerances are sufcient for easy mounting and correct positioning high manufacturing precision permits close geometrical tolerances, leading to a well balanced coupling, also for high speed conditions high pressures let high torque to...

shaft - hub locking device with medium to high torque capacity single taper design, self-centering, self-locking general purpose unit, particularly recommended for servo- and stepping-motors no axial movement of hub during installation good bending moment capacity shaft tolerance h8; hub bore tolerance H8 shaft and hub bore surface nish Ra < 3,2 μm Fig.1: fastening of a drive pulley with MAV 2061

Mini Composition • slotted inner ring, with intergrated push-off threads slotted outer ring set of socket head cap screws, outer ring inner ring screws Fig.2: mounting a lever arm with MAV 2061 Fig.3: using MAV 2061 to connect a linear wheel

shaft - hub locking device with medium to high torque capacity single taper design, self-centering, self-locking designed for thin walled hubs no axial movement of hub during installation good bending moment capacity shaft tolerance h7-h11; hub bore tolerance H7-H11 shaft and hub bore surface nish Ra < 3,2 μm For applications with extremely thin hubs we can offer special Locking Assemblies designed according to your requirements. Fig.: mounting a pinion with MAV 5061

Mini Composition • slotted inner ring, with intergrated push-off threads slotted outer ring set of socket head cap screws, grade 12.9 outer ring inner ring Since this fan blade is manufactured in plastic, the Locking Device MAV 5061 is the preferred solution, due to low contact pressures on shaft and hub. Fig.2: connecting fan blade with MAV 5061

medium to high torque capacity single taper design, self-centering, easy removal shaft tolerance h8-h11; hub bore tolerance H8-H11 shaft and hub bore surface nish Ra < 3,2 μm Increasing / reducing torque capacity of MAV 7903 stepped shaft Fig.1: transmissible torque = Mt x 0,72

• slotted outer ring, with intergrated push-off threads • slotted inner ring • set of socket head cap screws, inner ring outer ring straight shaft

shaft to shaft rigid coupling with high torque capacity and compact design connection of shafts with different diameters is possible, through inner ring modication or adapter sleeve shafts surface nish Ra < 3,2 μm Fig.1: special MAV 1204 with cover for screws

Mini Composition slotted inner ring two outer thrust rings set of hexagonal head cap screws, grade 10.9 (size M5 grade 8.8) inner ring thrust rings Fig.2: two different shaft sizes connected with special MAV 1204 Fig.3: adapter sleeve system for MAV 1204

two-part shrink disc for shaft - hollow shaft connection with high torque capacity single taper design medium bending moment capacity recommended for high speed applications shaft and hollow shaft surface nish Ra < 3,2 μm Fig.1: MAV shrink disc 3008 used to mount hollow shaft gearbox onto driven shaft

Mini Composition • push-off threads slotted inner ring, with integrated outer thrust ring set of hexagonal head cap screws, grade 10.9 (size M5 grade 8.8) outer ring inner ring Ps: contact pressure on shaft (diameter ds) Ph: contact pressure on hollow shaft (diameter d)

Installation Instructions Mini Locking Assemblies MAV Locking Assemblies are ready for installation. Performances are based on the following conditions: • Locking Assembly, shaft and hub bore oiled • oiled screws Installation 1. If necessary clean and slightly oil the parts. Do not use MoS2 based grease or similar to lubricate shaft, hub and Locking Assembly. 2. Disengage the rings by loosening the screws or, if necessary, by moving some of them into the push-off threads of the inner ring. Relocate any screws used to separate the rings. 3. Set torque wrench to the indicated tightening torque...