• Interruption or limitation of torque. Couplings are frequently chosen after the machines to be connected have already been selected. Thanks to a large number of different coupling assembly options, specified marginal conditions 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 operating or blocking brakes, devices to record speed or the attachment of sprockets or pulleys. Torsionally flexible couplings have resilient elements usually manufactured from elastomer materials. Using an elastomer material with a suitable ShoreA hardness provides the most advantageous 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. Clutches interrupt or limit the transmissible torque. The engaging and disengaging forces on externally operated clutches are introduced via a mechanically, electrically, hydraulically or pneumatically operatingmechanism. Overload, centrifugal or freewheel clutches draw their engaging energy from the transmitted output. Torsionally rigid couplings are designed to be rigid in a peripheral direction and flexible in radial and axial directions. The angle of rotation and torque are conducted through the coupling without a phase shift. • Compensation for shaft misalignment with low restorative forces. 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 Fottinger 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 flexible, are used. • Control of characteristic angular vibration frequency and damping. The mechanical drive train comprises individual units such as motor, gear unit and driven machine. The coupling connects these component assemblies. As well as the transmission of rotary motion and torque, other requirements may bemade of the coupling. • Noise insulation, electrical insulation. Couplings are divided into twomain groups, couplings and clutches. SHAFT COUPLINGS COUPLINGS CLUTCHES Externally Operated Clutches Torque Controlled Safety Couplings Speed Controlled Centrifugal Clutches Rotation Direction Controlled Freewheel Clutches Overrunning Clutches Rigid Clamp Couplings Flanged Couplings Mechanism Couplings Flexible Friction Hydrodynamic Couplings Magnetic Couplings Friction Couplings Positive Torsionally Rigid Gear Couplings All Steel Membrane Couplings Universal Joint Couplings Parallel Crank Couplings Torsionally Flexible Steel Spring Couplings Pin and Bush Couplings Pin Couplings Rubber Element Couplings Highly Flexible Rubber Tyre Couplings Rubber Disc Couplings Rubber Spacer Ring Couplings 1 #DriveLineHarmony Shaft Coupling Types Mechanical Power Transmission Couplings www.jbj.co.uk/couplings.html#flender
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