FLENDER Standard Couplings Introduction © Siemens AG 2015 1 ■ Overview The mechanical drive train comprises individual units such as motor, gear unit and driven machine. The coupling connects these component assemblies. Rigid couplings, designed as clamp, flanged or mechanism couplings, connect machines which must not undergo any shaft misalignment. Hydrodynamic couplings, often also called fluid or Fцttinger couplings, are used as starting couplings in drives with high mass moments of inertia of the driven machine. In drive technology very often flexible, positive couplings, which may be designed to be torsionally rigid, torsionally flexible or highly flex- ible, are used.
As well as the transmission of rotary motion and torque, other re- quirements may be made of the coupling. • Compensation for shaft misalignment with low restorative forces • Control of characteristic angular vibration frequency and • damping • Interruption or limitation of torque • Noise insulation, electrical insulation Torsionally rigid couplings are designed to be rigid in a periph- eral direction and flexible in radial and axial directions. The an- gle of rotation and torque are conducted through the coupling without a phase shift. Couplings are frequently chosen after the machines to be con- nected have already been selected.
Thanks to a large number of different coupling assembly options, specified marginal con- ditions for clearance and connection geometry can be met from the standard range. The coupling also performs secondary functions, e.g. providing a brake disk or brake drum for operat- ing or blocking brakes, devices to record speed or the attach- ment of sprockets or pulleys. Torsionally flexible couplings have resilient elements usually manufactured from elastomer materials. Using an elastomer ma- terial with a suitable ShoreA hardness provides the most advan- tageous torsional stiffness and damping for the application. Shaft misalignment causes the resilient elements to deform.
Highly flexible couplings have large-volume (elastomer) resilient elements of low stiffness. The angle of rotation and torque are conducted through the coupling with a considerable phase shift. Couplings are divided into two main groups, couplings and clutches. Clutches interrupt or limited the transmissible torque. The en- gaging and disengaging forces on externally operated clutches are introduced via a mechanically, electrically, hydraulically or pneumatically operating mechanism. Overload, centrifugal or freewheel clutches draw their engaging energy from the trans- mitted output.
Shaft couplings Clamp couplings Flanged couplings Mechanism couplings Clutches Safety couplings Centrifugal clutches Freewheel clutches Overrunning clutches Hydrodynamic Magnetic couplings Friction couplings couplings Gear couplings All-steel membrane Steel-spring couplings Pin-and-bush couplings Rubber-disk Rubber-tire G_MD10_EN_00001a couplings Universal-joint couplings Parallel-crank couplings couplings Pin couplings Rubber element couplings Rubber spacer ring couplings couplings 1/2 Siemens MD 10.1 · 2015 Coup lings Clut ches rig id flexi ble exter oper nally ated torque-c ontrolled speed c ontrolled rotation contr direction olled frict ion pos itive Torsion ally rigid Torsi flex onally ible Highly flexible