In addition to gear couplings, claw and disc couplings can be used to connect the drive motor and gearbox in crane and hoist applications. Like the gear coupling, these other two options are designed to compensate for angular, radial and axial shaft misalignment:
• Claw coupling—Torsionally flexible, these couplings transmit torque via elastic buffers made from Perbunan (Pb), which are joined together as an intermediate ring. This ring dampens shocks and torsional vibrations, is resistant to oil and can handle wide temperature Because of their dampening capabilities, claw couplings are preferable in many crane applications.
• Disc coupling—Unlike claw couplings—which contain rubber—rigid, all-metal disc couplings require no lubrication and will operate reliably with little to no wear or maintenance.